Flanges and their joints - Bolting - Part 4: Selection of bolting for equipment subject to the Pressure Equipment Directive 2014/68/EU

This European Standard is applicable to the selection of bolting for equipment subject to the Pressure Equipment Directive 2014/68/EU.
It specifies standards and additional requirements for dimensions, materials and technical conditions of delivery for bolting.
The bolting selection covered by this European Standard is regarded to be used for combination with flanges according to the series EN 1092 (PN designated flanges) and the series EN 1759 (Class designated flanges).
The selection is based on commonly used materials, bolts and nuts. It covers temperature ranges of the general service of standard flanges (based on PN or Class).
NOTE 1   The bolting selection given may be used in combination with non-standard flanges too provided that the range of application of the equipment for which the bolting is intended to be used is covered. It is the purchaser's option to decide on this.
When selecting bolting according to this European Standard it is essential to take into account other parameters such as type of fluids, corrosion hazards and relaxation at elevated temperatures.
The purpose of this European Standard is to provide a selection of most commonly used bolting types and bolting material combinations as well a tool for easy selection of suitable bolting for equipment.
It is not the intention to specify all possible applications but to give guidance on the most commonly applications. According to this, e.g. application limits for material in the creep range are not explicitly covered in this European Standard but some bolting materials listed (see Table 3, footnote h) are suitable to be used in this temperature range. Wherever the starting material standard provides mechanical properties for this temperature range respective reference is made in Table 3.
NOTE 2   Special services and ambient conditions may require the application of coatings. It is the purchaser's option to decide on this. Depending on the coating used, a verification of the temperature ranges

Flansche und ihre Verbindungen - Schrauben und Muttern - Teil 4: Auswahl von Schrauben und Muttern zur Anwendung im Gültigkeitsbereich der Druckgeräterichtlinie 2014/68/EU

Dieses Dokument ist anzuwenden für die Auswahl von Schrauben und Muttern für Flanschverbindungen bei Geräten, die der Druckgeräterichtlinie 2014/68/EU unterliegen.
Es legt Normen und zusätzliche Anforderungen an Maße, Werkstoffeigenschaften und technische Lieferbedingungen für Schrauben und Muttern fest.
ANMERKUNG 1 Unterlegscheiben liegen nicht im Anwendungsbereich dieses Dokuments.
Die Auswahl beruht auf allgemein gebräuchlichen Schrauben und Muttern. Sie umfasst übliche Temperaturbereiche für den allgemeinen Betrieb von Flanschen.
Bei der Auswahl von Schrauben und Muttern nach diesem Dokument ist es unerlässlich, Umgebungsbedingungen und weitere Parameter einschließlich der Art von Flüssigkeiten, Korrosions-gefährdungen, sauren Betriebsbereichen, Sprödbruch bei niedrigen Temperaturen und Relaxation bei erhöhten Temperaturen zu berücksichtigen.
Der Zweck dieses Dokuments ist es, eine Auswahl der gebräuchlichsten Arten und Werkstoffkombinationen von Schrauben und Muttern bereitzustellen.
Es ist nicht beabsichtigt, sämtliche möglichen Anwendungen festzulegen, sondern eine Leitlinie für die gebräuchlichsten Anwendungen bereitzustellen. Beispielsweise werden Anwendungsgrenzen von Werkstoffen im Zeitstandbereich in diesem Dokument nicht explizit behandelt. Wenn in einer Werkstoffnorm mechanische Eigenschaften für den Zeitstandbereich bereitgestellt werden, wird in Tabelle 3 darauf entsprechend verwiesen.
ANMERKUNG 2 Spezielle Betriebsbereiche und Umgebungsbedingungen können das Aufbringen von Beschichtungen erfordern. Die diesbezügliche Entscheidung liegt beim Besteller. In Abhängigkeit von der verwendeten Beschichtung kann eine Überprüfung der in Tabelle 3 und Tabelle 4 angegebenen Temperaturbereiche erforderlich sein.
ANMERKUNG 3 Anhang B enthält Arten und Werkstoffkombinationen von Schrauben und Muttern entsprechend gebräuchlicher nationaler Normen, die nicht in Tabelle 2, Tabelle 3 und Tabelle 4 aufgeführt sind.

Brides et leurs assemblages - Boulonnerie - Partie 4 : Sélection de la boulonnerie pour équipments relevant de la Directive Equipments sous pression 2014/68/EU

Le présent document est applicable à la sélection de la boulonnerie destinée aux assemblages à brides des équipements relevant de la Directive Équipements sous pression 2014/68/UE.
Elle spécifie les normes et les exigences supplémentaires relatives aux dimensions, matériaux et conditions techniques de livraison applicables à la boulonnerie.
NOTE 1   Les rondelles n’entrent pas dans le domaine d’application du présent document.
La sélection s’appuie sur la boulonnerie couramment utilisée. Elle couvre les plages de température d'usage général des brides.
Lors de la sélection de la boulonnerie conformément au présent document, il est essentiel de tenir compte des conditions environnementales et d'autres paramètres tels que le type de fluide, les risques de corrosion, les applications avec gaz acides, la rupture fragile à basse température et la relaxation à température élevée.
L’objectif du présent document est de fournir une sélection des types de boulonnerie et des combinaisons de matériaux de boulonnerie les plus couramment utilisés.
Il n’a pas vocation à spécifier toutes les applications possibles mais plutôt à fournir des lignes directrices sur les applications les plus courantes. Par exemple, les limites d'application pour les matériaux dans le domaine du fluage ne sont pas explicitement traitées dans le présent document. Lorsque la norme de matériau de base fournit des propriétés mécaniques pour le domaine du fluage, la référence est indiquée respectivement dans le Tableau 3.
NOTE 2   Des applications spéciales et des conditions à température ambiante peuvent exiger l’application de revêtements. Cette option est laissée à l’initiative de l’acheteur. En fonction du revêtement utilisé, une vérification des plages de température données dans le Tableau 3  et le Tableau 4 peut s’avérer nécessaire.
NOTE 3        Dans l'Annexe B, sont spécifiés des types de boulons et des combinaisons de matériaux de boulons selon les normes nationales communément utilisées autres que celles énumérées dans le Tableau 2, le Tableau 3 et
le Tableau 4.

Prirobnice in prirobnični spoji - Vijaki in matice - 4. del: Izbira vijakov in matic za opremo, ki je v skladu z Direktivo o tlačni opremi 2014/68/EU

General Information

Status
Published
Public Enquiry End Date
02-Dec-2019
Publication Date
21-Apr-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Apr-2021
Due Date
17-Jun-2021
Completion Date
22-Apr-2021

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SLOVENSKI STANDARD
SIST EN 1515-4:2021
01-maj-2021
Nadomešča:
SIST EN 1515-4:2010

Prirobnice in prirobnični spoji - Vijaki in matice - 4. del: Izbira vijakov in matic za

opremo, ki je v skladu z Direktivo o tlačni opremi 2014/68/EU

Flanges and their joints - Bolting - Part 4: Selection of bolting for equipment subject to

the Pressure Equipment Directive 2014/68/EU
Flansche und ihre Verbindungen - Schrauben und Muttern - Teil 4: Auswahl von

Schrauben und Muttern zur Anwendung im Gültigkeitsbereich der Druckgeräterichtlinie

2014/68/EU

Brides et leurs assemblages - Boulonnerie - Partie 4 : Sélection de la boulonnerie pour

équipments relevant de la Directive Equipments sous pression 2014/68/EU
Ta slovenski standard je istoveten z: EN 1515-4:2021
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
21.060.20 Matice Nuts
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
SIST EN 1515-4:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 1515-4:2021
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SIST EN 1515-4:2021
EN 1515-4
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 21.060.10; 21.060.20; 23.040.60 Supersedes EN 1515-4:2009
English Version
Flanges and their joints - Bolting - Part 4: Selection of
bolting for equipment subject to the Pressure Equipment
Directive 2014/68/EU

Brides et leurs assemblages - Boulonnerie - Partie 4 : Flansche und ihre Verbindungen - Schrauben und

Sélection de la boulonnerie pour équipments relevant Muttern - Teil 4: Auswahl von Schrauben und Muttern

de la Directive Equipments sous pression 2014/68/EU zur Anwendung im Gültigkeitsbereich der

Druckgeräterichtlinie 2014/68/EU
This European Standard was approved by CEN on 1 February 2021.

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, Turkey 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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1515-4:2021 E

worldwide for CEN national Members.
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SIST EN 1515-4:2021
EN 1515-4:2021 (E)
Contents Page

European foreword ...................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 4

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 5

3.1 Terms and definitions ................................................................................................................................... 5

3.2 Symbols and units ........................................................................................................................................... 7

4 Selection of bolting types and materials ................................................................................................ 7

4.1 General................................................................................................................................................................ 7

4.2 Selection of bolting types ............................................................................................................................. 7

4.3 Selection of bolting material combinations .......................................................................................... 8

4.4 Requirements of bolting related to property classes ...................................................................... 11

5 Manufacturing ................................................................................................................................................ 11

5.1 General.............................................................................................................................................................. 11

5.2 Coating .............................................................................................................................................................. 12

6 Technical conditions of delivery ............................................................................................................. 12

6.1 General.............................................................................................................................................................. 12

6.2 Requirements for prevention of brittle fracture at low temperatures ..................................... 12

7 Traceability and inspection documents ............................................................................................... 14

7.1 Traceability ..................................................................................................................................................... 14

7.2 Inspection documents ................................................................................................................................. 14

7.3 Alternative to inspection documents .................................................................................................... 15

8 Ordering information .................................................................................................................................. 15

Annex A (normative) Studs threaded full length .............................................................................................. 16

Annex B (informative) Additional bolting types and materials according to commonly used

national standards ....................................................................................................................................... 17

Annex C (informative) Additional requirements for hot dip galvanized carbon steel bolting ........ 18

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2014/68/EU aimed to be covered ...................................................... 19

Bibliography ................................................................................................................................................................. 20

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SIST EN 1515-4:2021
EN 1515-4:2021 (E)
European foreword

This document (EN 1515-4:2021) has been prepared by Technical Committee CEN/TC 74 “Flanges and

their joints”, the secretariat of which is held by DIN.

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 September 2021, and conflicting national standards

shall be withdrawn at the latest by September 2021.

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 1515-4:2009.
EN 1515, Flanges and their joints — Bolting, consists of the following parts:
— Part 1: Selection of bolting;
— Part 2: Classification of bolt materials for steel flanges, PN designated;
— Part 3: Classification of bolt materials for steel flanges, class designated;

— Part 4: Selection of bolting for equipment subject to the Pressure Equipment Directive 2014/68/EU.

Main changes compared to edition EN 1515-4:2009:

— explanation of requirements for starting material in accordance to EN 10269:2013;

— some temperature ranges and assignment of material groups are amended in Table 3;

— option for traceability by means of lot identification marking instead of inspection documents;

— separate requirements have been given to bolting other than those in EN 10269:2013;

— requirements for prevention of brittle fracture have been updated.

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(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this

document.

According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Turkey and the

United Kingdom.
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SIST EN 1515-4:2021
EN 1515-4:2021 (E)
1 Scope

This document is applicable to the selection of bolting for flanged joints on equipment subject to the

Pressure Equipment Directive 2014/68/EU.

It specifies standards and additional requirements for dimensions, material properties and technical

conditions of delivery for bolting.
NOTE 1 Washers are not within the scope of this document.

The selection is based on commonly used bolting. It covers common temperature ranges of the general

service of flanges.

When selecting bolting according to this document it is essential to take into account environmental

conditions and other parameters including type of fluids, corrosion hazards, sour service, low

temperature brittle failure and relaxation at elevated temperatures.

The purpose of this document is to provide a selection of most commonly used bolting types and bolting

material combinations.

It is not the intention to specify all possible applications but to give guidance on the most common

applications. For example, application limits for material in the creep range are not explicitly covered in

this document. Where material standard provides mechanical properties for the creep range respective

reference is made in Table 3.

NOTE 2 Special services and ambient conditions may require the application of coatings. It is the purchaser’s

option to decide on this. Depending on the coating used, a verification of the temperature ranges given in Table 3

and Table 4 may be required.

NOTE 3 In Annex B there are bolting types and bolting material combinations according to commonly used

national standards other than those listed in Table 2, Table 3 and Table 4.
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 764-5:2014, Pressure equipment - Part 5: Inspection documentation of metallic materials and

compliance with the material specification

EN 1092-1:2018, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN

designated - Part 1: Steel flanges

EN 1759-1:2004, Flanges and their joint - Circular flanges for pipes, valves, fittings and accessories, Class

designated - Part 1: Steel flanges, NPS 1/2 to 24
EN 10204:2004, Metallic products - Types of inspection documents

EN 10269:2013, Steels and nickel alloys for fasteners with specified elevated and/or low temperature

properties
EN 13445-3:2014, Unfired pressure vessels - Part 3: Design

As impacted by EN 13445-3:2014/A1:2015, EN 13445-3:2014/A2:2016, EN 13445-3:2014/A3:2017,

EN 13445-3:2014/A4:2018, EN 13445-3:2014/A5:2018, EN 13445-3:2014/A6:2019, EN 13445-3:2014/A7:2019

and EN 13445-3:2014/A8:2019.
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SIST EN 1515-4:2021
EN 1515-4:2021 (E)
EN 13480-3:2017, Metallic industrial piping - Part 3: Design and calculation

EN ISO 898-1:2013, Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts,

screws and studs with specified property classes - Coarse thread and fine pitch thread (ISO 898-1:2013)

EN ISO 898-2:2012, Mechanical properties of fasteners made of carbon steel and alloy steel - Part 2: Nuts

with specified property classes - Coarse thread and fine pitch thread (ISO 898-2:2012)

EN ISO 3269:2019, Fasteners - Acceptance inspection (ISO 3269:2019)

EN ISO 3506-1:2020, Fasteners - Mechanical properties of corrosion-resistant stainless steel fasteners -

Part 1: Bolts, screws and studs with specified grades and property classes (ISO 3506-1:2020)

EN ISO 3506-2:2020, Fasteners - Mechanical properties of corrosion-resistant stainless steel fasteners -

Part 2: Nuts with specified grades and property classes (ISO 3506-2:2020)
EN ISO 4014:2011, Hexagon head bolts - Product grades A and B (ISO 4014:2011)

EN ISO 4017:2014, Fasteners - Hexagon head screws - Product grades A and B (ISO 4017:2014)

EN ISO 4032:2012, Hexagon regular nuts (style 1) - Product grades A and B (ISO 4032:2012)

EN ISO 4033:2012, Hexagon high nuts (style 2) - Product grades A and B (ISO 4033:2012)

EN ISO 4042:2018, Fasteners - Electroplated coating systems (ISO 4042:2018)

EN ISO 6892-2:2018, Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature

(ISO 6892-2:2018)
EN ISO 16228:2018, Fasteners - Types of inspection documents (ISO 16228:2017)
EN ISO 16426:2002, Fasteners - Quality assurance system (ISO 16426:2002)
ISO 261:1998, ISO general purpose metric screw threads — General plan

ISO 965-2:1998, ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for

general purpose external and internal screw threads — Medium quality
3 Terms and definitions
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
bolting

type of fastener such as a bolt, screw or stud with normal, reduced or waisted shank or nut

As impacted by EN 13480-3/A1:2021, EN 13480-3/A2:2020 and EN 13480-3/A3:2020.
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SIST EN 1515-4:2021
EN 1515-4:2021 (E)
3.1.2
purchaser

person or organization that orders products in accordance with this European Standard

Note 1 to entry: Where a purchaser has responsibilities under the requirements of EU Directive listed in

Annex ZA, the use of this European Standard, if its reference is published in the OJEU (Official Journal of European

Union), will provide the presumption of conformity with the essential requirements of the Directive as identified

in Annex ZA.
3.1.3
bolting manufacturer

person or organization that is responsible for the compliance of the bolting with the requirements of

this European Standard and the referenced standards given for bolting and starting materials agreed

with the purchaser
3.1.4
manufacturing lot

quantity of fasteners of a single designation including product grade, property class and sizes,

manufactured from bar, wire, rod or flat product from a single cast, processed through the same or

similar steps at the same time or over a continuous time period through the same heat treatment

and/or coating, if any
Note 1 to entry: Same heat treatment or coating means:

• for a continuous process, the same treatment cycle without any setting modification;

• for a discontinuous process, the same treatment cycle for identical consecutive loads (batches).

Note 2 to entry: The manufacturing lot may be split into several manufacturing batches for processing purposes

and then reassembled into the same manufacturing lot.
3.1.5
manufacturing lot number

unique number assigned by the bolting manufacturer and which allows full traceability from the

finished product back through all previous steps of the manufacturing operations to a given cast

number of the starting material of manufacture
3.1.6
starting material
material from which the bolt or nut is manufactured
3.1.7
creep range

the temperature range at which a material has time dependent mechanical properties

---------------------- Page: 8 ----------------------
SIST EN 1515-4:2021
EN 1515-4:2021 (E)
3.2 Symbols and units
The symbols and respective units used in this document are defined in Table 1.
Table 1 — Symbols and units
Symbol Designation Unit
KV Impact rupture energy J
T Material impact test temperature °C
T Minimum metal temperature of the bolting °C
4 Selection of bolting types and materials
4.1 General

The selection of bolting types and bolting material combinations for a certain application shall consider

in addition to the requirements covered by this document, the range of application of the equipment for

which the bolting is intended to be used. The selection shall consider all service conditions including

maximum/minimum allowable temperature, required bolt load, tightening method and resultant

stresses, type of fluids, corrosion hazards and if applicable type and material of gasket.

Furthermore, it shall be regarded that flanged joints shall remain tight under the expected operating

conditions. Other properties like residual magnetism and relaxation properties shall be evaluated by

the purchaser.

The minimum yield strength, tensile strength, and creep of the bolting shall be suitable for the required

bolt load determined for the application and tightening method. Where there is a requirement

concerning the strength category for bolting given in EN 1092-1:2018, Annex E, EN 1759-1:2004,

2 1

Annex B, EN 13480-3:2017, Annex D , or EN 13445-3:2014, Clause 11 , then this shall be observed by

the user of this document.
4.2 Selection of bolting types
Selection of bolting types according to Table 2.
Table 2 — Types of bolting
Dimensional standard
Remarks
Bolts/Studs Nuts
EN ISO 4032:2012
EN ISO 4014:2011 Hexagon head bolt
EN ISO 4033:2012
EN ISO 4032:2012
EN ISO 4017:2014 Hexagon head bolt, threaded full length
EN ISO 4033:2012
EN ISO 4032:2012
Annex A Stud bolt, threaded full length
EN ISO 4033:2012

The user shall determine whether EN ISO 4033:2012 Nuts are required for the application. For sizes ≥ M39

nuts with m = d are recommended.
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SIST EN 1515-4:2021
EN 1515-4:2021 (E)
4.3 Selection of bolting material combinations

A selection of commonly used bolting material combinations and their suitable application ranges is

shown in Table 3 and Table 4. Combination of bolting materials other than the combinations shown

may reduce the given temperature limits.

All bolting materials shall conform to the requirements of the standard that specifies it and starting

material shall fulfil all the requirements of EN 10269:2013. The heat treatment may be performed on

the starting material or on the finished bolting.

Guidance on conditions to determine the permissible minimum temperature is defined in 6.2.

Table 3 — Selection of bolting materials combinations acc. to EN 10269:2013 with suitable

application ranges
Steel designation name
Suitable
Type of bolting and description of
PN temperature Steel designation number
material groups
Line
range
Class Material standard
up to
Bolts, screws, Bolts, screws,
°C Nuts Nuts
studs studs
25CrMo4 C35E
Unalloyed steel
1 All −10 to 400 0,25C-1Cr-Mo 1.7218 1.1181
elev. temp.
EN 10269:2013 EN 10269:2013
42CrMo4 C45E
Unalloyed steel
2 All −10 to 350 0,42C-1Cr-Mo 1.7225 1.1191
elev. temp.
EN 10269:2013 EN 10269:2013
25CrMo4 25CrMo4
3 All −60 to 500 0,25C-1Cr-Mo 0,25C-1Cr-Mo 1.7218 1.7218
EN 10269:2013 EN 10269:2013
25CrMo4 42CrMo4
4 All −40 to 500 0,25C-1Cr-Mo 0,42C-1Cr-Mo 1.7218 1.7225
EN 10269:2013 EN 10269:2013
42CrMo4 42CrMo4
5 All −40 to 500 0,42C-1Cr-Mo 0,42C-1Cr-Mo 1.7225 1.7225
EN 10269:2013 EN 10269:2013
42CrMo5–6 42CrMo4
6 All −10 to 500 0,42C-1,3Cr-0,6Mo 0,42C-1Cr-Mo 1.7233 1.7225
EN 10269:2013 EN 10269:2013
40CrMoV4–6 42CrMo4
7 All −10 to 500 0,40C-1Cr-0,6Mo-V 0,42C-1Cr-Mo 1.7711 1.7225
EN 10269:2013 EN 10269:2013
21CrMoV5–7 21CrMoV5–7
0,21C-1,3Cr-0,7Mo- 0,21C-1,3Cr-0,7Mo-
8 All −10 to 500 1.7709 1.7709
V V
EN 10269:2013 EN 10269:2013
20CrMoVTiB4–10 20CrMoVTiB4–10
0,2C-1Cr-1Mo-V-Ti- 0,2C-1Cr-1Mo-V-Ti-
9 All −10 to 500 1.7729 1.7729
B B
EN 10269:2013 EN 10269:2013
---------------------- Page: 10 ----------------------
SIST EN 1515-4:2021
EN 1515-4:2021 (E)
Steel designation name
Suitable
Type of bolting and description of
temperature Steel designation number
material groups
Line
range
Material standard
Class
up to
Bolts, screws, Bolts, screws,
°C Nuts Nuts
studs studs
X6NiCrTiMoVB X6NiCrTiMoVB
25–15–2 25–15–2
25Ni-15Cr-0,2Ti- 25Ni-15Cr-0,2Ti-
b f
10 All −60 to 650
Mo-V-B Mo-V-B
1.4980 1.4980
EN 10269:2013 EN 10269:2013
X22CrMoV12–1 X22CrMoV12–1 QT2
QT2
1.4923
11 All −10 to 500 12Cr-1Mo-V 12Cr-1Mo-V
1.4923
EN 10269:2013
EN 10269:2013
X7CrNiMoBNb16– X7CrNiMoBNb16–
16 16
12 All −10 to 650 16Cr-16Ni-Mo-B-Nb 16Cr-16Ni-Mo-B-Nb
1.4986 1.4986
EN 10269:2013 EN 10269:2013
X5CrNiMo17–12–2 X5CrNiMo17–12–2
+AT
PN 40
13 −196 to 550 17Cr-12Ni-2Mo 17Cr-12Ni-2Mo
Cl. 300
1.4401 1.4401
EN 10269:2013 EN 10269:2013
X5CrNiMo17–12–2 X5CrNiMo17–12–2
+AT+C700
PN 100 17Cr-12Ni-2Mo
14 −196 to 200 17Cr-12Ni-2Mo
Cl. 600 +AT+C
1.4401 1.4401
EN 10269:2013 EN 10269:2013
X5CrNi18–10 X5CrNi18–10
+AT
PN 40
15 −196 to 550 18Cr-10Ni 18Cr-10Ni
Cl. 300
1.4301 1.4301
EN 10269:2013 EN 10269:2013
X5CrNi18–10 X5CrNi18–10
+AT+C700
PN 100 18Cr-10Ni
d a
16 −60 to 200 18Cr-10Ni
Cl. 600 AT+C
1.4301 1.4301
EN 10269:2013 EN 10269:2013

Allowable stresses for elevated temperatures may be taken from the material in AT condition, as no stresses exist for the

cold worked condition.
Commonly used for PN 160 up to PN 400.
Is limited to be used for max. PN 40/Cl. 300 (low strength bolting).

−200 °C for studs or for bolts manufactured by machining from annealed rods or bars (AT) without work hardening

except thread forming, if any.

May be used in the creep range. For maximum suitable temperature see EN 10269:2013.

When intended to be used down to −273 °C, for additional requirements see Table 7.

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SIST EN 1515-4:2021
EN 1515-4:2021 (E)

Table 4 — Selection of bolting materials combinations acc. to property classes, with suitable

application ranges
Suitable Type of bolting
Property class
temperature and description of
Material standard
range material groups
Line
Class
Bolts,
up to
°C screws, Nuts Bolts, screws, studs Nuts
studs
5.6 5
PN 40 Unalloyed Carbon
1 −10 to 300 — —
Cl. 300 Steel Steel
EN ISO 898-1:2013 EN ISO 898-2:2012
8.8 8
PN 40 Alloyed Carbon
2 −10 to 300 — —
Cl. 300 Steel Steel
EN ISO 898-1:2013 EN ISO 898-2:2012
A2–50 A2–50, A2–70
PN 40
18Cr-
3 −200 to 400 18Cr-9Ni — —
9Ni
Cl. 300
EN ISO 3506-1:2020 EN ISO 3506-2:2020
A2–70 A2–70
PN 100
18Cr-
4 −200 to 400 18Cr-9Ni — —
9Ni
Cl. 600
EN ISO 3506-1:2020 EN ISO 3506-2:2020
A3–50 A2–50, A2–70
PN 40
18Cr-
5 −200 to 400 18Cr-9Ni — —
9Ni
Cl. 300
EN ISO 3506-1:2020 EN ISO 3506-2:2020
A3–70 A2–70
PN 100
18Cr-
6 −200 to 400 18Cr-9Ni — —
9Ni
Cl. 300
EN ISO 3506-1:2020 EN ISO 3506-2:2020
A4–50 A4–50 A4–70
18Cr-
PN 40
18Cr-9Ni-
7 −60 to 400 9Ni- — —
Cl. 300
EN ISO 3506-1:2020 EN ISO 3506-2:2020
A4–70 A4–70
18Cr-
PN 100
18Cr-9Ni-
8 −60 to 400 9Ni- — —
Cl. 600
EN ISO 3506-1:2020 EN ISO 3506-2:2020
A5–50 A4–50, A4–70
18Cr-
PN 40
18Cr-9Ni-
9 −60 to 400 9Ni- — —
Cl. 300
EN ISO 3506-1:2020 EN ISO 3506-2:2020
A5–70 A4–70
18Cr-
PN 100
18Cr-9Ni-
10 −60 to 400 9Ni- — —
Cl. 600
EN ISO 3506-1:2020 EN ISO 3506-2:2020
Up to PN 63 for temperature up to 120 °C.
The use of free-cutting steel is not permitted.
Is limited to be used for max. PN 40/Cl. 300 (low strength bolting).

−200 °C for studs or for bolts manufactured by machining from annealed rods or bars (AT) without work hardening except

thread forming, if any.
Generally cold forged nuts will be used in strength class 70.
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SIST EN 1515-4:2021
EN 1515-4:2021 (E)
Suitable Type of bolting
Property class
temperature and description of
Material standard
range material groups
Line
Class
Bolts,
up to
°C screws, Nuts Bolts, screws, studs Nuts
studs

EN ISO 898-1:2013 and EN ISO 898-2:2012 are not giving any values of mechanical properties in elevated temperatures.

The use of these bolts as such is limited to max +50 °C. For use in temperatures above +50 °C, 4.4 applies.

Stabilized by other elements: 5C ≤ Ti ≤ 0,80 and/or 10C ≤ Nb ≤ 1,00.
4.4 Requirements of bolting related to property classes

Bolts of property classes 5.6 and 8.8 shall be validated by regular tensile testing according to

EN ISO 6892-2:2018 at a temperature of 300 °C on a machined test piece derived from full-size bolts,

screws and studs. The minimum strength properties according to Table 5 apply.

For bolts of steel grade A2 to A5 the mechanical properties shall be guaranteed. The minimum values of

strength properties for design and service purposes shall be ensured by appropriate method.

Nominal design stresses for design shall be determined acc. to applicable product standard and applied

2 1
calculation method (e.g. EN 13480-3:2017 , EN 13445-3:2014 , etc.).
Table 5 — Minimum strength properties of bolting to be secured
Tensile Minimum proof strength Rp0,2/t (MPa)
strength
at a temperature (°C) of:
Property class Size limitation
20 100 200 300 400
(MPa)
5.6 ≤ M 39 500 300 270 229 192 —
8.8 ≤ M 39 800 640 590 540 480 —
A2–50 to A5– ≤ M 39 500 210 175 155 135 125
A2–70 to A5– ≤ M 24 700 450 380 360 335 315

The above strength values for 5.6 and 8.8 bolts have been derived from EN ISO 898-1:2013 and its earlier

versions. The values for austenitic bolts have been derived from EN 13445-2:2014 by multiplying the

allowable stresses by safety factor 1,5.
5 Manufacturing
5.1 General

Final heat treatment is not necessary for bolting which are machined from adequate pre-treated bars.

The process of pre-treatment of bars is at the responsibility of the bolting manufacturer.

Generally cold forming (except rolling of external threads) requires a subsequent heat treatment.

However cold working is necessary and therefore permitted for austenitic stainless steel bolting in

accordance to property class 70 and for nuts in accordance to property classes 5 and 8, in order to

achieve hardness specifications and therefore post heat treatment is not allowed. Nuts should be

obtained, preferably, by forging. The internal thread of the nut will usually be machined.

As impacted by EN 13445-2:2014/A3:2018.
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SIST EN 1515-4:2021
EN 1515-4:2021 (E)
5.2 Coating

The type of coating shall be specified in the purchase order (see Clause 8). The coating process is under

the responsibility of the bolting manufacturer and shall take into consideration confirmation of

achievement of the mechanical and dimensional properties of bolting, as appropriate.

The coating to be used for the bolting shall be appropriate for the foreseen service conditions.

NOTE 1 In general, bolting will be delivered:
• with a primary manufacture finish (slightly greased); or
• with an electrolytic coating in compliance with EN ISO 4042:2018; or
• hot galvanized in compliance with EN ISO 10684:2004;

• passivated according to EN ISO 16048:2003 (applicable for corrosion-resistant stainless-steel bolting

only).

• Fasteners with different types of coating shall not be mixed within one flanged connection.

• The upper and lower temperature limits of coatings, including the influence on fastener material must

be considered when specifying or using the coating.
NOTE 2 For additional requi
...

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