SIST EN 10253-4:2025
(Main)Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements
Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements
This document specifies the technical delivery requirements for seamless and welded butt-welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of austenitic and austenitic-ferritic (duplex) stainless steel in two test-categories which are intended for pressure purposes at room temperature, at low temperature or at elevated temperatures, and for the transmission and distribution of fluids and gases.
It specifies:
a) type of fittings;
1) type A: butt-welding fittings with reduced pressure factor;
2) type B: butt-welding fittings for use at full service pressure;
b) steel grades and their chemical compositions;
c) mechanical properties;
d) dimensions and tolerances;
e) requirements for inspection and testing;
f) inspection documents;
g) marking;
h) protection and packaging.
NOTE The selection of the appropriate fitting (material, thickness) is the ultimate responsibility of the manufacturer of the pressure equipment (see European Legislation for Pressure Equipment). In the case of a harmonized supporting standard for materials, presumption of conformity to the ESRs is limited to technical data of materials in the standard and does not presume adequacy of the material to a specific item of equipment. Consequently, it is essential that the technical data stated in the material standard be assessed against the design requirements of this specific item of equipment to verify that the ESRs of the PED are satisfied.
Formstücke zum Einschweißen - Teil 4: Austenitische und austenitisch-ferritische (Duplex-)Stähle mit besonderen Prüfanforderungen
Dieses Dokument legt die technischen Lieferbedingungen für nahtlose und geschweißte Formstücke zum Einschweißen (Rohrbogen, konzentrische und exzentrische Reduzierstücke, T-Stücke mit gleichem Abzweig und mit reduziertem Abzweig, Kappen) aus austenitischem und austenitisch-ferritischem (Duplex) nichtrostendem Stahl in zwei Prüfkategorien fest, die für Druckbeanspruchungen bei Raumtemperatur, Niedrigtemperatur oder bei erhöhter Temperatur sowie für die Weiterleitung und Verteilung von Fluiden und Gasen vorgesehen sind.
Es legt fest:
a) den Typ der Formstücke;
1) Typ A: Formstücke zum Einschweißen, verminderter Ausnutzungsgrad;
2) Typ B: Formstücke zum Einschweißen, voller Ausnutzungsgrad;
b) Stahlsorten und ihre chemischen Zusammensetzungen;
c) die mechanischen Eigenschaften;
d) die Maße und Grenzabmaße;
e) die Anforderungen an die Prüfungen;
f) die Prüfbescheinigungen;
g) die Kennzeichnung;
h) die Schutzmaßnahmen und Verpackung.
ANMERKUNG Die Auswahl des geeigneten Formstücks (Werkstoff, Dicke) liegt letztendlich in der Verantwortung des Druckgeräteherstellers (siehe europäische Rechtsvorschriften für Druckgeräte). Im Falle einer harmonisierten unterstützenden Norm für Werkstoffe beschränkt sich die Vermutung der Konformität mit den grundlegenden Sicherheitsanforderungen auf die in der Norm genannten technischen Daten für Werkstoffe und bedeutet nicht, dass davon ausgegangen wird, dass der Werkstoff für ein bestimmtes Gerät angemessen ist. Somit sind die in der Werkstoffnorm angegebenen technischen Daten im Hinblick auf die Anforderungen an die Auslegung des betreffenden Geräts zu bewerten, um sicherzustellen, dass die grundlegenden Sicherheitsanforderungen der Druckgeräterichtlinie (DGRL) erfüllt sind.
Raccords à souder bout à bout - Partie 4 : Aciers inoxydables austénitiques et austéno‐ferritiques avec contrôle spécifique
Le présent document spécifie les exigences techniques de livraison des raccords à souder bout à bout, sans soudure et soudés (coudes, réductions concentriques et excentriques, tés égaux et réduits, et caps) en aciers inoxydables austénitiques et austéno-ferritiques (duplex) dans deux catégories d'essai, destinés à des usages sous pression à température ambiante, à basse température ou à température élevée, ainsi qu'au transport et à la distribution de fluides et de gaz.
Il spécifie :
a) le type de raccords ;
1) type A : raccords à souder bout à bout à facteur de pression réduit ;
2) type B : raccords à souder bout à bout pour utilisation à pleine pression de service ;
b) les nuances d'acier et leur composition chimique ;
c) les caractéristiques mécaniques ;
d) les dimensions et tolérances ;
e) les exigences en matière de contrôle et d'essai ;
f) les documents de contrôle ;
g) le marquage ;
h) la protection et l'emballage.
NOTE Le choix du raccord approprié (matériau, épaisseur) est de la responsabilité ultime du fabricant de l'équipement sous pression (voir la législation européenne sur les équipements sous pression). Dans le cas d'une norme de support harmonisée pour les matériaux, la présomption de conformité aux exigences essentielles de sécurité est limitée aux données techniques des matériaux de la norme et ne suppose pas l'adéquation du matériau à une partie spécifique de l'équipement. Par conséquent, il est essentiel que les données techniques présentées dans la norme du matériau soient évaluées par rapport aux exigences de conception de l'élément spécifique de l'équipement de façon à vérifier que les exigences essentielles de sécurité de la PED sont satisfaites.
Cevni fitingi za soležne zvare - 4. del: Kovna avstenitna in avstenitno-feritna (dupleksna) nerjavna jekla s posebnimi zahtevami kontrole
Ta dokument določa tehnične dobavne zahteve za nevarjene in varjene fitinge za soležne zvare (v obliki kolena, koncentričnih in ekscentričnih redukcijskih kosov, enakomernih in zoževalnih T-kosov, kapic) iz avstenitnega in avstenitno-feritnega (dupleksnega) nerjavnega jekla v dveh preskusnih kategorijah, ki so namenjeni za uporabo s tlakom pri sobni temperaturi, nizki temperaturi ali povišanih temperaturah ter za prenos in distribucijo tekočin in plinov. Določa: a) vrsto fitingov; 1) tip A: fitingi za soležne zvare z zmanjšanim tlačnim faktorjem; 2) tip B: fitingi za soležne zvare za uporabo pri polnem delovnem tlaku; b) vrste jekla in njihovo kemično sestavo; c) mehanske lastnosti; d) dimenzije in tolerance; e) zahteve za preglede in preskuse; f) dokumente o pregledih; g) označevanje; h) zaščito in embalažo. OPOMBA: Za izbiro ustreznega fitinga (material, debelina) je odgovoren proizvajalec tlačne opreme (glej evropsko zakonodajo za tlačno opremo). V primeru harmoniziranega podpornega standarda za materiale so zagotovila o skladnosti z osnovnimi varnostnimi zahtevami (ESR) omejena na tehnične podatke o materialih v tem standardu, standard pa ne zagotavlja ustreznosti materiala za določen element opreme. Zato je bistveno tehnične podatke, navedene v tem standardu za materiale, oceniti glede na zahteve zasnove določenega elementa opreme, s čimer se zagotovi upoštevanje osnovnih varnostnih zahtev Direktive o tlačni opremi (PED).
General Information
- Status
- Published
- Public Enquiry End Date
- 31-Jan-2018
- Publication Date
- 23-Jul-2025
- Technical Committee
- IFEK - Ferrous metals
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 23-Jul-2025
- Due Date
- 27-Sep-2025
- Completion Date
- 24-Jul-2025
Relations
- Effective Date
- 09-Jul-2025
- Effective Date
- 18-Jan-2023
Overview
EN 10253-4:2025 - Butt-welding pipe fittings - Part 4 defines technical delivery requirements for seamless and welded butt-welding fittings (elbows, concentric/eccentric reducers, tees, caps) manufactured from wrought austenitic and austenitic‑ferritic (duplex) stainless steels. Published by CEN, the standard covers fittings intended for pressure service at room, low and elevated temperatures and for transmission/distribution of fluids and gases. It also clarifies manufacturer responsibility to verify material suitability for specific pressure equipment under applicable European legislation (e.g., the PED).
Key Topics
The standard sets out requirements in these main areas:
- Types of fittings and service categories: Type A (reduced pressure factor) and Type B (full service pressure).
- Steel grades and chemical composition: Accepted stainless grades and product vs. cast analysis requirements.
- Mechanical properties: Tensile, impact and elevated/low temperature behaviour requirements.
- Dimensions and tolerances: Detailed dimensional limits for elbows, tees, reducers, caps and preferred diameters/wall thicknesses.
- Manufacturing and heat treatment: Product making, welding and heat-treatment conditions.
- Inspection and testing requirements: Sampling, test frequency, and required tests.
- Test methods referenced: Chemical analysis, tensile tests (base and transverse weld), ring expansion, weld bend tests, impact testing, dimensional testing, visual testing and non‑destructive testing (NDT).
- Documentation, marking, protection and packaging: Content of inspection documents and traceability/marking rules.
Practical Applications
EN 10253-4:2025 is used wherever butt-weld pipe fittings of austenitic or duplex stainless steels are specified for pressure piping systems, including:
- Process plants (chemical, petrochemical, pharmaceutical)
- Power generation and steam systems
- Oil & gas transmission and distribution
- Cryogenic and high‑temperature services The standard ensures fittings meet mechanical strength, corrosion resistance and inspection expectations for safe pressure operation.
Who should use this standard
- Manufacturers and fabricators of butt‑welding fittings
- Procurement and quality engineers specifying stainless steel fittings
- Inspectors and testing laboratories performing acceptance tests and NDT
- Design and pressure-equipment engineers verifying material fitness under the PED
Related Standards
- Other parts of the EN 10253 series (complementary product requirements)
- Material standards and harmonized supporting standards for stainless steels
- European Pressure Equipment Directive (PED) - for conformity and design validation
Keywords: EN 10253-4:2025, butt-welding pipe fittings, austenitic stainless steel, duplex stainless steel, inspection requirements, dimensions and tolerances, mechanical properties, NDT, pressure equipment.
Frequently Asked Questions
SIST EN 10253-4:2025 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements". This standard covers: This document specifies the technical delivery requirements for seamless and welded butt-welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of austenitic and austenitic-ferritic (duplex) stainless steel in two test-categories which are intended for pressure purposes at room temperature, at low temperature or at elevated temperatures, and for the transmission and distribution of fluids and gases. It specifies: a) type of fittings; 1) type A: butt-welding fittings with reduced pressure factor; 2) type B: butt-welding fittings for use at full service pressure; b) steel grades and their chemical compositions; c) mechanical properties; d) dimensions and tolerances; e) requirements for inspection and testing; f) inspection documents; g) marking; h) protection and packaging. NOTE The selection of the appropriate fitting (material, thickness) is the ultimate responsibility of the manufacturer of the pressure equipment (see European Legislation for Pressure Equipment). In the case of a harmonized supporting standard for materials, presumption of conformity to the ESRs is limited to technical data of materials in the standard and does not presume adequacy of the material to a specific item of equipment. Consequently, it is essential that the technical data stated in the material standard be assessed against the design requirements of this specific item of equipment to verify that the ESRs of the PED are satisfied.
This document specifies the technical delivery requirements for seamless and welded butt-welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of austenitic and austenitic-ferritic (duplex) stainless steel in two test-categories which are intended for pressure purposes at room temperature, at low temperature or at elevated temperatures, and for the transmission and distribution of fluids and gases. It specifies: a) type of fittings; 1) type A: butt-welding fittings with reduced pressure factor; 2) type B: butt-welding fittings for use at full service pressure; b) steel grades and their chemical compositions; c) mechanical properties; d) dimensions and tolerances; e) requirements for inspection and testing; f) inspection documents; g) marking; h) protection and packaging. NOTE The selection of the appropriate fitting (material, thickness) is the ultimate responsibility of the manufacturer of the pressure equipment (see European Legislation for Pressure Equipment). In the case of a harmonized supporting standard for materials, presumption of conformity to the ESRs is limited to technical data of materials in the standard and does not presume adequacy of the material to a specific item of equipment. Consequently, it is essential that the technical data stated in the material standard be assessed against the design requirements of this specific item of equipment to verify that the ESRs of the PED are satisfied.
SIST EN 10253-4:2025 is classified under the following ICS (International Classification for Standards) categories: 23.040.40 - Metal fittings; 77.140.20 - Stainless steels. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 10253-4:2025 has the following relationships with other standards: It is inter standard links to SIST EN 10253-4:2008/AC:2009, SIST EN 10253-4:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 10253-4:2025 is associated with the following European legislation: EU Directives/Regulations: 2014/68/EU, 97/23/EC; Standardization Mandates: M/601. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase SIST EN 10253-4:2025 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Nadomešča:
SIST EN 10253-4:2008/AC:2009
Cevni fitingi za soležne zvare - 4. del: Kovna avstenitna in avstenitno-feritna
(dupleksna) nerjavna jekla s posebnimi zahtevami kontrole
Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex)
stainless steels with specific inspection requirements
Formstücke zum Einschweißen - Teil 4: Austenitische und austenitisch-ferritische
(Duplex-)Stähle mit besonderen Prüfanforderungen
Raccords à souder bout à bout - Partie 4 : Aciers inoxydables austénitiques et
austéno‐ferritiques avec contrôle spécifique
Ta slovenski standard je istoveten z: EN 10253-4:2025
ICS:
23.040.40 Kovinski fitingi Metal fittings
77.140.20 Visokokakovostna jekla Stainless steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 10253-4
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2025
EUROPÄISCHE NORM
ICS 23.040.40; 77.140.20 Supersedes EN 10253-4:2008
English Version
Butt-welding pipe fittings - Part 4: Wrought austenitic and
austenitic-ferritic (duplex) stainless steels with specific
inspection requirements
Raccords à souder bout à bout - Partie 4 : Aciers Formstücke zum Einschweißen - Teil 4: Austenitische
inoxydables austénitiques et austéno-ferritiques und austenitisch-ferritische (Duplex) nichtrostende
(duplex) avec contrôle spécifique Stähle mit besonderen Prüfanforderungen
This European Standard was approved by CEN on 21 July 2024.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10253-4:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 5
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 11
4 Symbols and abbreviations . 12
5 Classification and designation . 13
5.1 Classification of grades . 13
5.2 Designation of steel grades . 13
5.3 Designation of fittings . 13
5.3.1 General . 13
5.3.2 Elbows and return bends . 13
5.3.3 Reducers . 13
5.3.4 Tees . 14
5.3.5 Caps and dished ends . 14
6 Information to be supplied . 14
6.1 Mandatory information . 14
6.2 Options . 14
6.3 Examples of an order . 16
6.3.1 Example 1 . 16
6.3.2 Example 2 . 16
6.3.3 Example 3 . 16
6.3.4 Example 4 . 16
6.3.5 Example 5 . 16
6.3.6 Example 6 . 17
6.3.7 Example 7 . 17
7 Resistance to internal pressure . 17
7.1 General . 17
7.2 Fittings of type A . 17
7.3 Fittings of type B . 17
8 Manufacturing process . 18
8.1 Steelmaking process . 18
8.2 Product making process for fittings and heat treatment . 18
8.2.1 Product making process . 18
8.2.2 Welding . 19
8.2.3 Heat treatment condition . 20
9 Technical requirements. 20
9.1 General . 20
9.2 Chemical composition . 20
9.2.1 Cast analysis . 20
9.2.2 Product analysis . 20
9.3 Mechanical properties . 24
9.3.1 At room temperature . 24
9.3.2 At elevated temperature . 24
9.3.3 At low temperature . 24
9.4 Weldability . 29
9.5 Corrosion resistance. 29
10 Appearance and internal soundness (delivery conditions) . 29
10.1 Definition of surface imperfections . 29
10.2 Appearance . 30
10.3 Internal soundness . 31
11 Dimensions and tolerances . 31
11.1 Dimensions . 31
11.1.1 General . 31
11.1.2 Elbows . 31
11.1.3 Tees . 32
11.1.4 Reducers . 33
11.1.5 Caps and dished ends . 34
11.1.6 Preferred diameters and wall thicknesses . 35
11.2 Dimensional tolerances . 35
11.2.1 Diameter . 35
11.2.2 Out of roundness . 35
11.2.3 Wall thickness tolerances . 36
11.2.4 Tolerances on specific dimensions and form . 36
11.2.5 Corrugation . 37
11.3 Performance of the end bevelling . 38
12 Inspection . 38
12.1 Type of inspection . 38
12.2 Inspection documents . 39
12.2.1 Type of inspection documents . 39
12.2.2 Content of inspection documents . 39
12.3 Summary of inspection and testing . 40
13 Sampling . 42
13.1 Frequency of tests . 42
13.1.1 Test unit . 42
13.1.2 Number of test pieces per test unit . 44
13.2 Preparation of samples and test pieces . 44
13.2.1 Samples for product analysis . 44
13.2.2 Samples and test pieces for mechanical tests. 44
13.2.3 Test piece for the tensile test on the base material. 44
13.2.4 Test piece for the tensile test transverse to the weld . 44
13.2.5 Test piece for the weld bend test . 44
13.2.6 Test piece for the impact test . 44
13.2.7 Test piece for the intergranular corrosion test . 45
14 Test methods . 45
14.1 Chemical analysis . 45
14.2 Tensile test on the base material . 45
14.2.1 At room temperature . 45
14.2.2 At elevated temperature . 45
14.3 Transverse tensile test on the weld . 45
14.4 Ring expansion . 46
14.5 Weld bend test . 46
14.6 Impact testing . 46
14.7 Dimensional testing . 47
14.8 Visual testing (VT) . 47
14.9 Non-destructive testing (NDT) . 47
14.9.1 Personnel . 47
14.9.2 NDT of the weld . 47
14.9.3 Intergranular corrosion test . 48
14.9.4 NDT for the detection of laminar imperfections . 48
14.9.5 NDT for the detection of longitudinal imperfections . 48
14.9.6 NDT for the detection of transverse imperfections . 48
14.9.7 NDT of bars and forgings . 48
14.9.8 Technological test of weld . 48
14.10 Positive material identification (PMI) . 49
15 Marking . 49
16 Protection and packaging . 50
Annex A (normative) Dimensions . 51
Annex B (normative) Determination of pressure factors and wall thickness . 72
Annex C (normative) Pressure factor Tables for fittings of type A . 96
Annex D (informative) Wall thickness tables for fittings of type B . 114
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of Directive 2014/68/EU aimed to be covered . 137
Bibliography . 138
European foreword
This document (EN 10253-4:2025) has been prepared by Technical Committee CEN/TC 459 “ECISS -
European Committee for Iron and Steel Standardization ”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2026 and conflicting national standards shall
be withdrawn at the latest by January 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 10253-4:2008.
The main changes compared to the previous edition are listed below:
a) Concretization of the scope;
b) Restructuring of EN 10253-2 and EN 10253-4 and ensuring they align with each other;
c) Update of technical requirements and dimensions to reflect current market standards;
d) Correction of identical construction dimensions within the EN 10253 series;
e) Introduction of additional wall thickness and diameter values;
f) Introduction of test concept TC2 analogous to pipe standards;
g) Rewording of some options and new numbering;
h) Modification of test lot sizes;
i) Update of contents for ultrasonic testing;
j) Update to the contents of welding chapters;
k) Revision of figures;
l) Update of the terms and definitions;
m) Update of normative references;
n) Editorial revision to follow the latest design rules;
o) Revision of mechanical properties;
p) Update of metric elbows dimensions table.
Through its sub-committee SC 10 “Steel tubes, and iron and steel fittings”, (secretariat: UNI).
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
EN 10253 comprises a series of European Standards about Butt-welding pipe fittings, namely:
— Part 1: Wrought carbon steel for general use and without specific inspection requirements;
— Part 2: Non alloy and ferritic alloy steels with specific inspection requirements;
— Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection
requirements;
— Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection
requirements.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
In writing this document, the competent committee recognized that there are two broad types of
products which are commonly used, and it was decided to reflect these in the standard by differentiating
between the two parts.
EN 10253-3 describes fittings without formal reference to the pressure resistance, which are not
intended to be used in applications, covered by the Pressure Equipment Directive (2014/68/EU) in
categories I to IV.
EN 10253-4 defines two types of fittings: Type A fittings have the same wall thickness at the welding ends
and at the body of the fitting as a pipe having the same specified wall thickness. Their resistance to
internal pressure is, in general, less than that of a straight pipe with the same dimensions. Type B fittings
showing increased wall thickness at the body of the fitting are designed to resist the same internal
pressure as a straight pipe with the same dimensions. These two types of fittings are intended to be used
in applications covered by the EU Directive 2014/68/EU. According to this Directive and further
interpretation guidelines (e.g. guideline G – 19), seamless fittings are considered as materials whereas
welded fittings are considered as components. Therefore, in some areas of this document, provisions for
seamless and welded fittings are different.
The selection of steel type and requirement level depend on many factors; the properties of the fluid to
be conveyed, the service conditions, the design code and any statutory requirements should all be taken
into consideration. Therefore, this document gives no detailed guidelines for the application of different
parts. It is the ultimate responsibility of the user to select the appropriate part for the intended
application.
1 Scope
This document specifies the technical delivery requirements for seamless and welded butt-welding
fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of austenitic and
austenitic-ferritic (duplex) stainless steel in two test-categories which are intended for pressure
purposes at room temperature, at low temperature or at elevated temperatures, and for the transmission
and distribution of fluids and gases.
It specifies:
a) type of fittings;
1) type A: butt-welding fittings with reduced pressure factor;
2) type B: butt-welding fittings for use at full service pressure;
b) steel grades and their chemical compositions;
c) mechanical properties;
d) dimensions and tolerances;
e) requirements for inspection and testing;
f) inspection documents;
g) marking;
h) protection and packaging.
NOTE The selection of the appropriate fitting (material, thickness) is the ultimate responsibility of the
manufacturer of the pressure equipment (see European Legislation for Pressure Equipment). In the case of a
harmonized supporting standard for materials, presumption of conformity to the ESRs is limited to technical data
of materials in the standard and does not presume adequacy of the material to a specific item of equipment.
Consequently, it is essential that the technical data stated in the material standard be assessed against the design
requirements of this specific item of equipment to verify that the ESRs of the PED are satisfied.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 10020:2000, Definition and classification of grades of steel
EN 10021:2006, General technical delivery conditions for steel products
EN 10027-1:2016, Designation systems for steels — Part 1: Steel names
EN 10027-2:2015, Designation systems for steels — Part 2: Numerical system
EN 10028-7:2016, Flat products made of steels for pressure purposes — Part 7: Stainless steels
EN 10088-1:2023, Stainless steels — Part 1: List of stainless steels
EN 10160:1999, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection
method)
EN 10168:2004, Steel products — Inspection documents — List of information and description
EN 10204:2004, Metallic products — Types of inspection documents
EN 10216-5:2021, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 5:
Stainless steel tubes
EN 10217-7:2021, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 7:
Stainless steel tubes
EN 10222-5:2017, Steel forgings for pressure purposes — Part 5: Martensitic, austenitic and austenitic-
ferritic stainless steels
EN 10228-4:2016, Non-destructive testing of steel forgings — Part 4: Ultrasonic testing of austenitic and
austenitic-ferritic stainless steel forgings
EN 10266:2003, Steel tubes, fittings and structural hollow sections — Symbols and definitions of terms for
use in product standards
EN 10272:2016, Stainless steel bars for pressure purposes
EN 13480-3:2024, Metallic industrial piping — Part 3: Design and calculation
EN ISO 148-1:2016, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-
1:2016)
EN ISO 377:2017, Steel and steel products — Location and preparation of samples and test pieces for
mechanical testing (ISO 377:2017)
EN ISO 2566-2:2021, Steel — Conversion of elongation values — Part 2: Austenitic steels (ISO 2566-2:2021,
Corrected version 2022-05)
EN ISO 3166-1:2020, Codes for the representation of names of countries and their subdivisions — Part 1:
Country code (ISO 3166-1:2020)
EN ISO 3651-2:1998, Determination of resistance to intergranular corrosion of stainless steels — Part 2:
Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in media containing
sulfuric acid (ISO 3651-2:1998)
EN ISO 4136:2022, Destructive tests on welds in metallic materials — Transverse tensile test
(ISO 4136:2022)
EN ISO 4885:2018, Ferrous materials — Heat treatments — Vocabulary (ISO 4885:2018)
EN ISO 5173:2023, Destructive tests on welds in metallic materials — Bend tests (ISO 5173:2023)
EN ISO 5817:2023, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding
excluded) — Quality levels for imperfections (ISO 5817:2023)
EN ISO 6892-1:2019, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
(ISO 6892-1:2019)
EN ISO 6892-2:2018, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature
(ISO 6892-2:2018)
EN ISO 8492:2013, Metallic materials — Tube — Flattening test (ISO 8492:2013)
EN ISO 8493:2004, Metallic materials — Tube — Drift-expanding test (ISO 8493:1998)
EN ISO 8495:2013, Metallic materials — Tube — Ring-expanding test (ISO 8495:2013)
EN ISO 8496:2013, Metallic materials — Tube — Ring tensile test (ISO 8496:2013)
EN ISO 9016:2022, Destructive tests on welds in metallic materials — Impact tests — Test specimen
location, notch orientation and examination (ISO 9016:2022)
EN ISO 9606-1:2017, Qualification testing of welders — Fusion welding — Part 1: Steels (ISO 9606-1:2012
including Cor 1:2012 and Cor 2:2013)
EN ISO 9712:2022, Non-destructive testing — Qualification and certification of NDT personnel
(ISO 9712:2021)
EN ISO 10893-2:2011, Non-destructive testing of steel tubes — Part 2: Automated eddy current testing of
seamless and welded (except submerged arc-welded) steel tubes for the detection of imperfections
(ISO 10893-2:2011)
EN ISO 10893-4:2011, Non-destructive testing of steel tubes — Part 4: Liquid penetrant inspection of
seamless and welded steel tubes for the detection of surface imperfections (ISO 10893-4:2011)
EN ISO 10893-6:2019, Non-destructive testing of steel tubes — Part 6: Radiographic testing of the weld
seam of welded steel tubes for the detection of imperfections (ISO 10893-6:2019)
EN ISO 10893-7:2019, Non-destructive testing of steel tubes — Part 7: Digital radiographic testing of the
weld seam of welded steel tubes for the detection of imperfections (ISO 10893-7:2019)
EN ISO 10893-8:2011, Non-destructive testing of steel tubes — Part 8: Automated ultrasonic testing of
seamless and welded steel tubes for the detection of laminar imperfections (ISO 10893-8:2011)
EN ISO 10893-10:2011, Non-destructive testing of steel tubes — Part 10: Automated full peripheral
ultrasonic testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of
longitudinal and/or transverse imperfections (ISO 10893-10:2011)
EN ISO 14284:2022, Steel and iron — Sampling and preparation of samples for the determination of
chemical composition (ISO 14284:2022)
EN ISO 14732:2013, Welding personnel — Qualification testing of welding operators and weld setters for
mechanized and automatic welding of metallic materials (ISO 14732:2013)
EN ISO 15614-1:2017, Specification and qualification of welding procedures for metallic materials —
Welding procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys
(ISO 15614-1:2017, Corrected version 2017-10-01)
As impacted by EN ISO 10893-2:2011/A1:2020.
As impacted by EN ISO 10893-8:2011/A1:2020.
As impacted by EN ISO 10893-10:2011/A1:2020.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 10020:2000, EN 10021:2006,
EN ISO 377:2017 and EN ISO 4885:2018 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp/
— IEC Electropedia: available at http://www.electropedia.org/
3.1
employer
organization for which a person works on a regular basis
Note 1 to entry: The employer may be either the fitting manufacturer or supplier or a third-party organization
providing a service, e.g. NDT.
3.2
model
designation for elbows, return bends, reducers and tees
Note 1 to entry: For elbows and return bends the model defines the bending diameter of the piece.
Note 2 to entry: For reducers the model defines concentric or eccentric or concentric straight or eccentric
straight shape of the piece.
Note 3 to entry: For caps the model defines the shape of the piece.
Note 4 to entry; For tees the model defines tee, pulled tee, branch welded tee (v-welded) and branch welded tee
(circumferential welded) shape of piece.
3.3
purchaser
person or organization that orders products in accordance with this document
Note 1 to entry: The purchaser is not necessarily, but may be, a manufacturer of pressure equipment in
accordance with the EU Directive listed in Annex ZA.
Note 2 to entry: Where a purchaser has responsibilities under this EU Directive, this standard will provide a
presumption of conformity with the essential requirements of the Directive so identified in Annex ZA.
3.4
weld during manufacture
weld made for obtaining a fitting
Note 1 to entry: This term does not include the tube welds when a tube is used as starting material.
3.5
seamless fitting
fitting manufactured without welding from starting material which is not welded
3.6
welded fitting
fitting made from welded starting material or fitting where welding is a part of the manufacturing process
3.7
test category
classification that indicates their extent and level of inspection and testing
4 Symbols and abbreviations
For the purposes of this document, the symbols given in EN 10266:2003 and the following apply.
A
Percentage of elongation after rupture, with reference to gauge length of 5,65 S
o
B Back to face distance for return bends, expressed in millimetres
C Centre to centre distance for return bends (C = 2R), expressed in millimetres
Specified outside diameter for elbows, return bends, equal tees, caps and the major outside
D
diameter for reducers and reducing tees, expressed in millimetres
D
Specified minor outside diameter for reducers and reducing tees, expressed in millimetres
D
Maximum outside diameter in one section, expressed in millimetres
max
D
Minimum outside diameter in the same section, expressed in millimetres
min
Distance from the axis of the branch outlet to the face of the centre body of tees, expressed in
millimetres
F
Distance from the centre of one face to the centre of bending of 90° elbow
Distance from the axis of the centre line to the face of the branch outlet expressed in
G
millimetres
Distance from the face of the branch outlet to the body of the pulled tee, expressed in
h
millimetres
Inside diameter at the welding ends of elbows, return bends, equal tees and at the major
ID
welding end of reducers and reducing tees (ID = D − 2T)
ID Inside diameter at the minor welding end of reducers and reducing tees (ID = D − 2T )
1 1 1 1
K Total height for caps, expressed in millimetres
L Face to face distance for reducers, expressed in millimetres
P Tolerance on the form of elbows
R Bending radius of elbows and return bends, expressed in millimetres
R
Inside spherical radius of cap
R
Inside knuckle radius of cap
R
Tensile strength, expressed in megapascals
m
R
Minimum 0,2 % proof strength, plastic extension expressed in megapascals
p0,2
R
Minimum 1,0 % proof strength, plastic extension expressed in megapascals
p1,0
Specified wall thickness at the welding ends for elbows, return bends, equal tees and bends
T
or on the D end for reducers and reducing tees, expressed in millimetres
Specified wall thickness on the D welding end of reducers and reducing tees, expressed in
T
millimetres
TC Test category
X Tolerance on the form of fittings
Z Distance from the extrados to the centre of a 45° elbow at the welding ends
5 Classification and designation
5.1 Classification of grades
In accordance with the classification system in EN 10088-1:2023, the steel grades covered in this
document are classified according to their structure into:
— austenitic steels;
— austenitic–ferritic (duplex) steels.
For more details, see EN 10088-1:2023.
5.2 Designation of steel grades
For fittings covered by this document the steel designation consists of:
— number of this document (EN 10253-4:2024);
plus either:
— steel name in accordance with EN 10027-1:2016;
or
— steel number allocated in accordance with EN 10027-2:2015.
5.3 Designation of fittings
5.3.1 General
Fittings are designated by their name and the following parameters.
5.3.2 Elbows and return bends
Elbows and return bends are designated by the following parameters:
a) model (2D, 3D 5D, D+100, 3DM or 5DM);
b) type (type A or type B);
c) angle;
d) outside diameter (D);
e) wall-thickness (T).
5.3.3 Reducers
Reducers are designated by the following parameters:
a) model (concentric (con) or eccentric (ecc) or concentric straight (con str) or eccentric straight
(ecc str));
b) type (type A or type B);
c) major diameter (D) and wall-thickness (T);
d) minor diameter (D ) and wall-thickness (T ).
1 1
For straight reducers the embodiment shall be noticed.
5.3.4 Tees
Equal and reducing tees are designed by the following parameters:
a) model (tee, pulled tee, branch welded tee (v-welded), or branch welded tee (circumferential
welded));
b) type (type A or type B);
c) major diameter (D) and minor diameter (D );
d) wall-thickness (T) and wall-thickness (T ).
NOTE If only one pair of dimension (D x T) is given, an equal tee is meant.
For pulled tees and branch welded tees the embodiment shall be noticed.
5.3.5 Caps and dished ends
Caps and dished ends are designated by the following parameters:
a) model cap (cap) or dished end (end);
b) type (type A or type B);
c) outside diameter (D);
d) wall-thickness (T).
6 Information to be supplied
6.1 Mandatory information
The following information shall be supplied at the time of enquiry and order:
a) quantity required (number of pieces);
b) reference to this document;
c) designation of fittings (see 5.3);
d) designation of the steel grade (see 5.2);
e) test category 1 or 2 (TC1/TC2) (see 12.3);
f) options, if any (see 6.2).
6.2 Options
A number of options are specified in this document and these are listed below. In the event that no option
has been specified at the time of enquiry and order, the fittings shall be supplied in accordance with the
basic specification (see 6.1).
1) Method of manufacture of the fitting (see 8.2.1);
2) starting product form and/or delivery condition (see 8.2.1);
NOTE Use for ordering seamless (S) or welded (W) fittings.
3) reporting of method of manufacture (see 8.2.1);
4) starting materials when manufacturing seamless fittings (see 8.2.1);
5) deviations from finished weld requirement (see 8.2.2.3);
6) heat treatment to be applied (see 8.2.3.1);
7) other steel grades in accordance with harmonized material standards (see 9.1);
8) product analysis (see 9.2.2 and Table 10);
9) verification of impact properties at room temperature (see 9.3.1 and Table 10);
10) agreed mechanical properties for wall thicknesses (see 9.3.1 and Table 10);
11) verification of tensile properties at elevated temperature (see 9.3.2 and Table 10);
12) verification of impact properties at low temperature (see 9.3.3 and Table 10);
13) intergranular corrosion test (see 9.5 and Table 10);
14) pickling (see 10.2);
15) shot blasting or bright annealing (see 10.2);
16) pickling and passivation (see 10.2);
17) tolerance on diameter to inside (see 11.2.1.1);
18) special tolerances (see 11.2.1.2);
19) plus tolerances on the body of the fitting (see 11.2.3);
20) special ends preparation (see 11.3);
21) type of inspection document other than the standard document (see 12.2.1);
22) tensile test transverse to the weld at room temperature (see Table 10 and 14.3);
23) bend test transverse to the weld (see Table 10 and 14.5);
24) impact test of the heat affected zone (see Table 10 and 14.6.1);
25) liquid penetrant testing of weld and weld ends (see Table 10 and 14.9.2);
26) liquid penetrant testing of surfaces (see Table 10 and 14.9.2);
27) NDT for the detection of laminar imperfections (see Table 10 and 14.9.4);
28) NDT of bars and forgings (see Table 10 and 14.9.7);
29) positive material identification (PMI) (see Table 10 and 14.10);
30) registration records of the temperatures (see 13.1.1);
31) test unit size – Table 13 (see 13.1.1);
32) test unit size – purchase order (see 13.1.1);
33) verification of impact properties transverse to the weld (see 13.2.6);
34) additional marking (see Clause 15);
35) special packaging (see Clause 16).
6.3 Examples of an order
6.3.1 Example 1
1 000 elbows in accordance with this docume
...
La norme SIST EN 10253-4:2025 est un document fondamental qui précise les exigences techniques de livraison pour les raccords de tuyauterie à souder bout à bout, en mettant l'accent sur les aciers inoxydables austénitiques et duplex (austénitico-ferritiques). Son champ d'application s'étend aux raccords sans soudure et soudés (coudes, réducteurs concentriques et excentriques, teés égaux et réducteurs, capuchons) destinés à des fins de pression à température ambiante, à basse température ou à des températures élevées, ainsi qu'à la transmission et à la distribution de fluides et de gaz. Parmi les forces de cette norme, on peut noter la clarté des catégories de raccords définies, avec d'une part les raccords de type A, qui sont conçus avec un facteur de pression réduit, et d'autre part les raccords de type B, qui peuvent supporter la pression de service complète. Cette distinction facilite la sélection appropriée des raccords en fonction des exigences spécifiques en matière de pression et d'application. De plus, la norme détaille des éléments essentiels tels que les grades d'acier et leurs compositions chimiques, les propriétés mécaniques, ainsi que les dimensions et tolérances, renforçant ainsi la pertinence de cette norme pour les fabricants de matériel sous pression. Les exigences en matière d'inspection et de test, ainsi que les documents d'inspection, sont également clairement énoncées, ce qui assure une traçabilité et un contrôle qualité rigoureux. L'importance de cette norme se reflète encore dans ses spécifications sur le marquage, la protection et l'emballage, qui garantissent que les raccords de tuyauterie sont conformes aux exigences de sécurité et de fiabilité. Ce niveau de détail aide non seulement les fabricants à se conformer aux exigences de l'équipement sous pression, mais assure également la conformité aux législations européennes. En somme, la SIST EN 10253-4:2025 offre une base solide pour garantir la qualité et la sécurité des raccords de tuyauterie en acier inoxydable, consolidant son rôle en tant que référence incontournable dans l'industrie.
SIST EN 10253-4:2025는 압력 목적을 위해 아우스테나이트 및 아우스테나이트-페라이트(듀플렉스) 스테인리스 강으로 제작된 용접 파이프 피팅에 대한 기술적 납품 요구 사항을 명확히 규정하고 있습니다. 이 문서는 원룸 온도, 저온 혹은 고온의 조건에서 압력에 적합하게 사용될 수 있는 용접 피팅의 유형, 강철 등급, 화학 성분, 기계적 성질, 치수 및 허용 오차, 검사 및 테스트 요구 사항, 검사 문서, 마킹, 보호 및 포장에 관한 내용을 다룹니다. 이 표준의 강점은 다양한 유형의 용접 피팅에 대한 명확한 정의와 함께, 각각의 피팅이 어떤 압력에 적합한지에 대한 정보를 제공한다는 점입니다. 특히, 압력 계수가 감소된 A형 피팅과 전체 서비스 압력에 사용할 수 있는 B형 피팅을 구분하여 제시하고 있어, 사용자는 자신의 요구 사항에 적합한 피팅을 쉽게 선택할 수 있습니다. 또한, SIST EN 10253-4:2025는 검사 및 테스트 요구 사항을 포함하고 있어, 품질 보증과 안전성을 강화할 수 있습니다. 이는 유체 및 가스를 전송하고 분배하는 과정에서의 위험 부담을 최소화하는 데 기여합니다. 문서에서 규정된 기계적 성질, 치수 및 허용 오차와 같은 자세한 정보는 제조업체에게 실질적인 지침을 제공하며, 전반적인 설계 요구 사항을 충족시키는 데 필수적입니다. 이 표준은 특정 검사 요구 사항을 갖춘 아우스테나이트 및 듀플렉스 스테인리스 강의 용접 파이프 피팅에 관한 것으로, 유럽 압력 장비 법률에 따라 제조업체가 올바른 재료와 두께를 선택하는 데 도움을 줄 수 있는 중요한 기준을 제공합니다. 전반적으로 SIST EN 10253-4:2025는 관련 업계에서 널리 인정받는 신뢰할 수 있는 표준으로, 품질과 안전성을 더욱 높이는 데 기여하고 있습니다.
SIST EN 10253-4:2025は、溶接管継手に関する標準であり、特にオーステナイト系およびオーステナイト-フェライト系（デュプレックス）ステンレス鋼に焦点を当てています。この標準は、室温、低温、または高温での圧力用途に使用されるシームレスおよび溶接済みのバット溶接フィッティング（エルボー、同心および偏心リデューサー、等しいおよびリデューシングティー、キャップ）に関する技術的な納品要件を明確に定めています。 この標準の強みは、具体的な検査要件を含むタイプA（減圧係数を有する溶接フィッティング）およびタイプB（全サービス圧で使用する溶接フィッティング）について詳細に規定されている点です。加えて、鋼材の種類や化学成分、機械的特性、寸法、および公差に関する要件も網羅されています。これは、使用される材料が安全かつ効果的に機能することを保証するために重要です。 また、inspections（検査）およびtesting（試験）の要件が定められていることにより、製品の品質管理が強化され、業界の信頼性が向上します。さらに、ミニマムの検査文書、マーク、保護および梱包に関する外交的な要件が記載されているため、製造者は標準に従った確実な製品を市場に提供することができます。 この標準の関連性は特筆すべきもので、圧力機器の製造者が適切なフィッティング（材料、厚さ）を選択することが求められる中で、材料の技術的データが具体的な装置の設計要件と比較され、PEDのESR（Essential Safety Requirements）を遵守しているかどうかを検証することが重要であることが示されています。この点において、SIST EN 10253-4:2025は、規制の枠組みの中で非常に重要な役割を果たしています。
The SIST EN 10253-4:2025 standard provides a comprehensive framework for the technical delivery requirements of butt-welding pipe fittings constructed from wrought austenitic and austenitic-ferritic (duplex) stainless steels. Its scope is both broad and specific, detailing various pipe fittings such as elbows, concentric and eccentric reducers, equal and reducing tees, and caps that are crucial for pressure applications across a range of temperatures. One of the key strengths of this standard is its clear classification of fittings into two categories: type A for fittings with a reduced pressure factor and type B for those designed for full service pressure. This classification aids manufacturers and engineers in selecting the appropriate fittings based on their specific operational requirements, thus enhancing safety and efficiency in fluid and gas transmission systems. The standard rigorously outlines essential technical specifications, including detailed chemical compositions of the steel grades, mechanical properties, dimensions and tolerances-vital elements that ensure the fittings meet industry performance standards. The inclusion of inspection requirements and testing protocols further strengthens the integrity of the fittings, leading to enhanced reliability in their application. Also notable is the emphasis on documentation, including requirements for inspection documents, marking, protection, and packaging. This component ensures that all parties involved in the manufacturing and installation processes are adequately informed and compliant with the stipulated regulations. Importantly, the standard addresses legal compliance by referencing the European Legislation for Pressure Equipment, underscoring the responsibility of manufacturers in assessing the selection of materials against specific design requirements. This aspect highlights the relevance of the standard within the broader regulatory framework, ensuring that products not only meet technical specifications but also conform to safety and performance regulations. Overall, the SIST EN 10253-4:2025 standard stands out for its detailed and structured approach to butt-welding pipe fittings, making it a critical resource for manufacturers and engineers engaged in the design and implementation of pressure equipment. Its comprehensive nature ensures that it remains highly relevant in today’s industrial landscape.
Die Norm SIST EN 10253-4:2025 bietet umfassende technische Lieferanforderungen für nahtlose und geschweißte Butt-Schweißfittings, die aus austenitischem und austenitisch-ferritischem (duplex) Edelstahl hergestellt werden. Diese Norm ist besonders relevant für Anwendungen, die Druckanforderungen bei Raumtemperatur, niedrigen Temperaturen oder erhöhten Temperaturen berücksichtigen. Die klare Definition der verschiedenen Typen von Fittings, einschließlich Typ A und Typ B, ermöglicht eine gezielte Auswahl je nach spezifischem Druckbedarf, was die Funktionalität und Sicherheit in der Flüssigkeits- und Gasübertragung verbessert. Ein herausragendes Merkmal dieser Norm ist die detaillierte Spezifikation der Stahlgüten und deren chemischen Zusammensetzungen, die es den Herstellern ermöglicht, qualitativ hochwertige Produkte zu schaffen, die den erforderlichen mechanischen Eigenschaften entsprechen. Darüber hinaus bietet die Norm Richtlinien zu Abmessungen, Toleranzen sowie Anforderungen für Inspektion und Prüfung. Dies unterstützt die Gewährleistung einer konsistenten Produktqualität und Zuverlässigkeit. Die Norm legt auch Wert auf die Dokumentation und das Kennzeichnen der Produkte, was die Rückverfolgbarkeit und Transparenz innerhalb der Lieferkette erhöht. Dies ist besonders wichtig in der heutigen industriellen Umgebung, wo Sicherheitsstandards von größter Bedeutung sind. Darüber hinaus wird durch den Abschnitt über Schutz und Verpackung sichergestellt, dass die Fittings während der Lagerung und dem Transport nicht beschädigt werden, was zur Gesamtqualität des Endprodukts beiträgt. Insgesamt ist die SIST EN 10253-4:2025 eine essentielle Norm für die Industrie, die nicht nur die Herstellungs- und Qualitätsanforderungen standardisiert, sondern auch die Sicherheit und Effizienz der Verwendung von Butt-Schweißfittings aus Edelstahl gewährleistet. Ihre Relevanz erstreckt sich über verschiedene Anwendungsbereiche und unterstützt Hersteller dabei, Produkte zu entwickeln, die den europäischen Vorschriften für Druckgeräte entsprechen.
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