kSIST FprEN 10253-4:2021

Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements

This draft European Standard 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   In the case of a harmonised 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

Dieser Norm-Entwurf 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-) Edelstahl 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.
Diese Norm legt fest:
a)   die Art der Formstücke;
1)   Typ A: Formstücke zum Einschweißen, verminderter Ausnutzungsgrad;
2)   Typ B: Formstücke zum Einschweißen, voller Ausnutzungsgrad;
b)   Stahlsorten und ihre chemische Zusammensetzung;
c)   die mechanischen Eigenschaften;
d)   die Maße und Grenzabmaße;
e)   die Anforderungen an die Prüfungen;
f)   die Prüfbescheinigungen;
g)   Kennzeichnung;
h)   die Schutzmaßnahmen und Verpackung.
ANMERKUNG   Im Falle einer unterstützenden harmonisierten 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 des fluides et des 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 En dernier ressort, la sélection du raccord approprié (matériau, épaisseur) est de la responsabilité 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 d'évaluer les données techniques présentées dans la norme du matériau en fonction des 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

General Information

• Status: Not Published
• Public Enquiry End Date: 31-Jan-2018
• ICS: 23.040.40 - Metal fittings
• ICS: 77.140.20 - Stainless steels
• Technical Committee: IFEK - Ferrous metals
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 11-Mar-2021
• Due Date: 29-Apr-2021
• Completion Date: 12-Mar-2021
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Ref Project: FprEN 10253-4 - Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements

Relations

• Revised: SIST EN 10253-4:2008 - Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements
• Effective Date: 29-Jan-2011
• Revised: SIST EN 10253-4:2008 - Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements
• Effective Date: 18-Jan-2023
• Revised: SIST EN 10253-4:2008 - Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 10253-4:2018
01-januar-2018
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
Ta slovenski standard je istoveten z: prEN 10253-4
ICS:
23.040.40 Kovinski fitingi Metal fittings
77.140.20 Visokokakovostna jekla Stainless steels
oSIST prEN 10253-4:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 10253-4:2018

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oSIST prEN 10253-4:2018


DRAFT
EUROPEAN STANDARD
prEN 10253-4
NORME EUROPÉENNE

EUROPÄISCHE NORM

November 2017
ICS 23.040.40; 77.140.20 Will supersede EN 10253-4:2008
English Version

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
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
ECISS/TC 110.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10253-4:2017 E
worldwide for CEN national Members.

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oSIST prEN 10253-4:2018
prEN 10253-4:2017 (E)
Contents Page
European foreword . 6
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 10
4 Symbols and abbreviations . 11
5 Classification of grades and designation . 12
5.1 Classification of grades . 12
5.2 Designation of steel grades . 12
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 . 13
5.3.5 Caps and dished ends . 14
6 Information to be supplied by the purchaser . 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
7 Resistance to internal pressure . 16
7.1 General . 16
7.2 Fittings of type A . 17
7.3 Fittings of type B . 17
8 Manufacturing process . 17
8.1 Steelmaking process . 17
8.2 Product making process for fittings and heat treatment . 17
8.2.1 Product making process . 17
8.2.2 Welding as part of the manufacturing process of the fitting . 18
8.2.3 Heat treatment condition . 19
9 Technical requirements. 19
9.1 General . 19
9.2 Chemical composition . 20
9.2.1 Cast analysis . 20
9.2.2 Product analysis . 20
9.3 Mechanical properties . 25
9.3.1 At room temperature . 25
9.3.2 At elevated temperature . 25
9.3.3 At low temperature . 25
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9.4 Creep rupture strength values . 32
9.5 Weldability . 32
9.6 Corrosion resistance . 32
10 Appearance and internal soundness (delivery conditions) . 32
10.1 Definition of imperfections . 32
10.2 Appearance . 33
10.3 Internal soundness . 34
11 Dimensions and tolerances . 34
11.1 Dimensions . 34
11.1.1 General . 34
11.1.2 Elbows . 34
11.1.3 Tees . 35
11.1.4 Reducers . 36
11.1.5 Caps and dished ends . 37
11.1.6 Preferred diameters and wall thicknesses. 38
11.2 Dimensional tolerances . 38
11.2.1 Diameter . 38
11.2.2 Out of roundness . 39
11.2.3 Wall thickness tolerances . 39
11.2.4 Tolerances on specific dimensions and form . 39
11.2.5 Corrugation . 41
11.3 Performance of the end bevelling . 41
12 Inspection . 42
12.1 Type of inspection . 42
12.2 Inspection documents . 42
12.2.1 Type of inspection documents . 42
12.2.2 Content of inspection documents . 42
12.3 Summary of inspection and testing . 43
13 Sampling . 45
13.1 Frequency of tests. 45
13.1.1 Test unit . 45
13.1.2 Number of test pieces per test unit . 47
13.2 Preparation of samples and test pieces . 47
13.2.1 Samples for product analysis . 47
13.2.2 Samples and test pieces for mechanical tests . 47
13.2.3 Test piece for the tensile test on the base material . 47
13.2.4 Test piece for the tensile test transverse to the weld . 47
13.2.5 Test piece for the weld bend test . 47
13.2.6 Test piece for the impact test . 47
13.2.7 Test piece for the intergranular corrosion test . 48
14 Test methods . 48
14.1 Chemical analysis . 48
14.2 Tensile test on the base material . 48
14.2.1 At room temperature . 48
14.2.2 At elevated temperature . 48
14.3 Transverse tensile test on the weld . 49
14.4 Ring expansion . 49
14.5 Weld bend test . 49
14.6 Impact testing . 49
14.7 Dimensional testing . 50
14.8 Visual testing (VT) . 50
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14.9 Non-destructive testing (NDT) . 50
14.9.1 Personnel . 50
14.9.2 NDT of the weld . 50
14.9.3 Intergranular corrosion test . 51
14.9.4 Detection of laminar imperfections . 51
14.9.5 NDT for the detection of longitudinal imperfections . 51
14.9.6 NDT for the detection of transverse imperfections . 51
14.9.7 NDT of bars and forgings . 51
14.10 Positive material identification (PMI) . 51
15 Marking . 51
16 Protection and packaging . 53
Annex A (normative) Dimensions . 54
A.1 General . 54
A.2 Elbows . 54
A.3 Tees . 58
A.3.1 Equal and reducing tees . 58
A.3.2 Pulled tees. 61
A.3.3 Branch welded tees . 64
A.4 Reducers . 68
A.4.1 Concentric and eccentric reducers . 68
A.4.2 Concentric and eccentric reducers (straight) . 70
A.5 Caps . 75
A.5.1 Dished ends . 76
Annex B (normative) Determination of pressure factors and wall thickness . 79
B.1 General . 79
B.2 Symbols and units . 79
B.3 Minimal and nominal wall thickness . 82
B.4 Pressure factors of fittings of type A . 82
B.4.1 General . 82
B.4.2 Pressure factor . 82
B.4.3 Elbows . 83
B.4.4 Tees . 83
B.4.5 Reducers . 86
B.4.6 Caps . 91
B.5 Wall thicknesses of fittings of type B . 93
B.5.1 General . 93
B.5.2 Elbows . 93
B.5.3 Tees . 94
B.5.4 Reducers . 97
B.5.4 Caps . 101
Annex C (normative) Pressure factor Tables for fittings of type A . 104
C.1 General . 104
C.2 Elbows . 104
C.3 Tees . 107
C.4 Reducers . 112
C.5 Caps . 120
Annex D (informative) Wall thickness tables for fittings of type B . 121
D.1 General . 121
D.2 Elbows . 121
D.3 Tees . 124
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D.4 Reducers . 130
D.5 Caps . 145
Annex E (informative) Reference data of strength values for creep rupture of austenitic
steels in the solution annealed condition . 147
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/68/EU . 155
Bibliography . 156

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oSIST prEN 10253-4:2018
prEN 10253-4:2017 (E)
European foreword
This document (prEN 10253-4:2017) has been prepared by Technical Committee ECISS/TC 110 " Steel
tubes, and iron and steel fittings", the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 10253-4:2008.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive 2014/68/EU.
For relationship with EU Directive(s), 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.
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oSIST prEN 10253-4:2018
prEN 10253-4:2017 (E)
Introduction
In writing this European Standard the competent committee recognized that there are two broad types
of products commonly used, and decided to reflect these in the standard by differentiating between 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
classes 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 than 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
...