EN 13445-2:2026/prA1
(Amendment)Unfired pressure vessels - Part 2: Materials
- Abstract
This document specifies the requirements for steel products used for unfired pressure vessels.
For some metallic materials other than steel, such as spheroidal graphite cast iron, aluminium, nickel, copper, titanium, requirements are or will be formulated in separate parts of this document.
For metallic materials which are not covered by a harmonized material standard and are not likely to be in near future, specific rules are given in this part or the above cited parts of this document.
- Status
- Not Published
- Publication Date
- 21-Jul-2026
- Technical Committee
- CEN/TC 54 - Unfired pressure vessels
- Drafting Committee
- CEN/TC 54/WG 52 - B - Material selection
- Current Stage
- 4060 - Closure of enquiry - Enquiry
- Start Date
- 05-Mar-2026
- Due Date
- 28-May-2026
- Completion Date
- 05-Mar-2026
EN 13445-2:2026/prA1 is a CEN draft amendment to EN 13445-2, Unfired pressure vessels - Part 2: Materials. It sets and updates the material rules for steel products used in unfired pressure vessels, and it gives special rules for some other metallic materials and for steel parts attached to the vessel. It is written for vessel designers, manufacturers, materials engineers, quality staff and buyers who need to select and verify pressure-vessel materials.
What does EN 13445-2:2026/prA1 specify?
EN 13445-2:2026/prA1 specifies material requirements for steel products used for unfired pressure vessels. It also points some other metallic materials, such as spheroidal graphite cast iron, aluminium, nickel, copper and titanium, to separate parts of the EN 13445 series, and it gives special rules for metallic materials that are not covered by a harmonized material standard.
This amendment is organized as targeted changes to Clause 2 on normative references, Clause 5 on non-pressure parts, Annex B on brittle-fracture selection methods, Annex E on European standardized steels by product form, and Annex ZA on the link with EU law.
| Annex / clause area | What it covers |
|---|---|
| Clause 5 | Materials for non-pressure parts such as lugs, skirts and baffles |
| Annex B | Method 1 and Method 2 for brittle-fracture prevention and impact testing |
| Annex E | European standardized steels grouped according to product form |
| Annex ZA | Relationship with Directive 2014/68/EU |
What are the key requirements of EN 13445-2:2026/prA1?
EN 13445-2:2026/prA1 mainly updates how material properties are used in design and how steels are selected for brittle-fracture resistance. In practice, it tells the user which material data to take from standards, how to adjust them for temperature, and which product forms and grades can be used in the vessel context.
Materials for non-pressure parts
Clause 5 requires materials for non-pressure parts, such as supporting lugs, skirts and baffles, to meet at least chemical composition and tensile-property requirements. They must not restrict the operating conditions of the part they are attached to, so the attachment material cannot become the weak link.
For steels other than austenitic steels, Clause 5 distinguishes steels with specified elevated-temperature proof strength from structural steels without such data. For the latter, the room-temperature minimum yield strength can be used up to 50 °C, and higher temperatures are handled with the reduction factors in Table 5-1. That matters when you size welded attachments, because you need temperature-adjusted strength values, not only catalog values.
For austenitic steels, Clause 5 uses the elevated-temperature 0,2 % proof strength when it is specified. When it is not specified, the tensile strength above 20 °C is calculated with a temperature factor and Table 5-3. The maximum nominal design stress for normal operating, exceptional and testing conditions is then taken from these material properties together with the safety factors in EN 13445-3.
Brittle-fracture prevention
Annex B, Method 1, uses selection tables for plates and strips, seamless and welded tubes, bars, forgings and fittings, ferritic castings, and nickel-alloyed steels. These tables combine product form, steel group, reference thickness and minimum temperature, so the designer can check whether the selected material is suitable for the intended service temperature and thickness.
The updated notes also flag practical limits: some materials need special welding precautions, thermomechanically treated steels shall not be post weld heat treated, and some nickel-alloyed steels have specific heat-treatment or welding conditions. For a buyer or manufacturer, this means the material certificate alone is not enough - the applicable note in Annex B has to be checked as part of the material selection.
Annex B, Method 2, links the design reference temperature to the impact test temperature. For applications below the dotted-line boundary in the figures, steels have to be impact tested at -40 °C or lower, and if the calculated test temperature is lower still, the lower value applies. This matters for low-temperature service because it controls the Charpy impact test condition, not just the nominal steel grade.
Product-form grouping
Annex E groups European standardized steels by product form. The table ties each grade to a product form, a referenced standard, a thickness limit and a note category, which helps when checking whether a plate, bar, tube, forging, casting or fitting is acceptable for a pressure-vessel application.
The notes attached to Annex E also carry practical restrictions, such as special precautions for welding because of carbon content, no welding on certain fasteners, no hot forming for thermomechanically treated steels, and a temperature limit for ferritic stainless steels of -10 °C and above. It also identifies specific bolting materials that can be used when the cited requirements are met.
What terms does EN 13445-2:2026/prA1 define?
- 0,2 % proof strength - the stress level used to represent the onset of permanent deformation, and the value Clause 5 uses for several elevated-temperature checks.
- Nominal design stress - the maximum stress allowed for normal operating, exceptional and testing load cases after applying the material data and safety factors.
- Design reference temperature (TR) - the temperature used in Annex B Method 2 to relate service conditions to impact testing.
- Impact test temperature (TKV) - the temperature at which the steel has to be impact tested for brittle-fracture verification.
- Reference thickness (eB) - the thickness used in Annex B tables and figures when linking product form, temperature and brittle-fracture resistance.
- PWHT - post weld heat treatment, a heat-treatment step that is restricted or required for some materials in the annex notes.
- TMCP - thermomechanically treated steels, which Annex B and Annex E treat with special restrictions on post-weld heat treatment and forming.
- AW - as-welded condition, the condition used in the Annex B Method 2 figures.
Who uses EN 13445-2:2026/prA1?
EN 13445-2:2026/prA1 is used by pressure-vessel designers, materials engineers, welding coordinators, manufacturers, inspectors and purchasers. They use it when choosing steel grades, checking temperature-dependent strength, setting impact-test conditions, reviewing material certificates, or deciding whether a specific product form can be used for an unfired pressure vessel.
It is also relevant for quality managers and buyers who need to compare supplier material specifications with the vessel design rules and with the pressure-equipment framework in the EU.
What changed in EN 13445-2:2026/prA1 from the previous edition?
EN 13445-2:2026/prA1 is a draft amendment that will modify EN 13445-2:2021+A1:2023. The changes stated in the document are:
- updated normative references in Clause 2, including revised references to EN 13445-4 and EN 13445-5
- added references to EN 10088-2, EN 10088-3, EN 10088-4, EN 10088-5, EN 10213 and EN 10253-2
- a rewritten Clause 5 for non-pressure parts, including temperature-dependent strength rules for steels and austenitic steels
- revised Annex B Method 1 selection tables for brittle-fracture prevention
- revised Annex B Method 2 figures and the related impact-testing rule for low-temperature applications
- a revised Annex E table grouping European standardized steels by product form
- updated Annex ZA wording for the relationship with Directive 2014/68/EU
- bibliography updates, including EN 10216-2:2024, EN 10216-5:2021, EN 10222-5:2017 and EN 10253-4:2008
Which standards are used with EN 13445-2:2026/prA1?
EN 13445-2:2026/prA1 works with other parts of the EN 13445 series and with material and product standards. The most important companion documents named in the amendment are:
- EN 13445-3 - provides the safety factors used to determine maximum nominal design stress
- EN 13445-4 - covers fabrication, including PWHT and hot-forming rules
- EN 13445-5 - covers inspection and testing
- EN 10088-2 / -3 / -4 / -5 - provide delivery conditions for stainless steels used in Clause 5
- EN 10213 - provides requirements for steel castings for pressure purposes
- EN 10253-2 - provides specific inspection requirements for butt-welding pipe fittings
The annex tables also draw on many product standards for plates, strips, tubes, bars, forgings, castings, fasteners and fittings, because those standards supply the grades that Annex B and Annex E group for vessel use.
What does the EN 13445-2:2026/prA1 document contain?
The document contains replacement tables and figures rather than a full rewrite of the base part. It includes updated selection tables for brittle-fracture prevention, with product form, grade, reference thickness and temperature data, plus notes on heat treatment, welding and temperature limits.
It also contains temperature-dependent calculation rules in Clause 5, including reduction-factor tables and a formula-based path for austenitic steels. Annex B adds figures that relate design reference temperature to impact test temperature, and Annex E gives a long product-form table for standardized steels used in pressure-vessel applications.
Annex ZA states the document’s relationship to Directive 2014/68/EU, so users working on pressure equipment for the EU can trace how the material rules fit the legal framework.
Relations
- Effective Date
- 29-Apr-2026
- Effective Date
- 14-May-2025
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Frequently Asked Questions
EN 13445-2:2026/prA1 is a draft published by the European Committee for Standardization (CEN). Its full title is "Unfired pressure vessels - Part 2: Materials". This standard covers: This document specifies the requirements for steel products used for unfired pressure vessels. For some metallic materials other than steel, such as spheroidal graphite cast iron, aluminium, nickel, copper, titanium, requirements are or will be formulated in separate parts of this document. For metallic materials which are not covered by a harmonized material standard and are not likely to be in near future, specific rules are given in this part or the above cited parts of this document.
This document specifies the requirements for steel products used for unfired pressure vessels. For some metallic materials other than steel, such as spheroidal graphite cast iron, aluminium, nickel, copper, titanium, requirements are or will be formulated in separate parts of this document. For metallic materials which are not covered by a harmonized material standard and are not likely to be in near future, specific rules are given in this part or the above cited parts of this document.
EN 13445-2:2026/prA1 is classified under the following ICS (International Classification for Standards) categories: 23.020.30 - Pressure vessels, gas cylinders. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 13445-2:2026/prA1 has the following relationships with other standards: It is inter standard links to EN 13445-2:2026, EN 13445-2:2021+A1:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 13445-2:2026/prA1 is associated with the following European legislation: EU Directives/Regulations: 2014/68/EU; Standardization Mandates: M/071, 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.
EN 13445-2:2026/prA1 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2026
Nekurjene tlačne posode - 2. del: Materiali - Dopolnilo A2
Unfired pressure vessels - Part 2: Materials
Unbefeuerte Druckbehälter - Teil 2: Werkstoffe
Récipients sous pression non soumis à la flamme - Partie 2 : Matériaux
Ta slovenski standard je istoveten z: EN 13445-2:2021+A1:2023/prA2
ICS:
23.020.32 Tlačne posode Pressure vessels
SIST EN 13445- en,fr,de
2:2021+A1:2023/oprA2:2026
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
EN 13445-
NORME EUROPÉENNE
2:2021+A1:2023
EUROPÄISCHE NORM
prA2
December 2025
ICS 23.020.30
English Version
Unfired pressure vessels - Part 2: Materials
Récipients sous pression non soumis à la flamme - Unbefeuerte Druckbehälter - Teil 2: Werkstoffe
Partie 2 : Matériaux
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 54.
This draft amendment A2, if approved, will modify the European Standard EN 13445-2:2021+A1:2023. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.
This draft amendment 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, 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.
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: 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 13445-2:2021+A1:2023/prA2:2025
worldwide for CEN national Members. E
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Contents Page
European foreword . 3
1 Modifications to Clause 2, “Normative references” . 4
2 Modifications to Clause 5, “Requirements for materials to be used for non-pressure
parts” . 4
3 Modifications to B.2.2, “Method 1” . 6
4 Modifications to B.2.3, “Method 2” . 11
5 Modifications to E.2, “European standardised steels grouped according to product
forms” . 13
6 Modifications to Annex ZA, “Relationship between this European Standard and the
Essential Requirements of EU Directive 2014/68/EU aimed to be covered” . 40
EN 13445-2:2021+A1:2023/prA2:2025 (E)
European foreword
This document (EN 13445-2:2021+A1:2023/prA2:2025) has been prepared by Technical Committee
CEN/TC 54 “Unfired pressure vessels”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
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
EN 13445-2:2021.
This document includes the text of the amendment itself. The amendment will be consolidated within
EN 13445-2:2021+A1:2023 in accordance with the maintenance system of EN 13445 series approved by
the CEN/BT Decision C172/2021.
EN 13445-2:2021+A1:2023/prA2:2025 (E)
1 Modifications to Clause 2, “Normative references”
Replace the following normative references:
“EN 13445-4:2021, Unfired pressure vessels — Part 4: Fabrication
EN 13445-5:2021, Unfired pressure vessels — Part 5: Inspection and testing”
with:
“EN 13445-4:2021+A1:2023, Unfired pressure vessels — Part 4: Fabrication
EN 13445-5:2021+A1:2024, Unfired pressure vessels — Part 5: Inspection and testing”
and update the references throughout the text.
Add the following new normative references:
“EN 10088-2:2024, Stainless steels — Part 2: Technical delivery conditions for sheet/plate and strip of
corrosion resistant steels for general purposes
EN 10088-3:2023, Stainless steels — Part 3: Technical delivery conditions for semi-finished products, bars,
rods, wire, sections and bright products of corrosion resistant steels for general purposes
EN 10088-4:2009, Stainless steels — Part 4: Technical delivery conditions for sheet/plate and strip of
corrosion resisting steels for construction purposes
EN 10088-5:2009, Stainless steels — Part 5: Technical delivery conditions for bars, rods, wire, sections and
bright products of corrosion resisting steels for construction purposes
EN 10213:2007+A1:2016, Steel castings for pressure purposes
EN 10253-2:2021, Butt-welding pipe fittings — Part 2: Non alloy and ferritic alloy steels with specific
inspection requirements”.
2 Modifications to Clause 5, “Requirements for materials to be used for
non-pressure parts”
Replace the current text of Clause 5 with the following:
"5 Requirements for materials to be used for non-pressure parts
5.1 General
For non-pressure parts, e.g. for supporting lugs, skirts, baffles and similar parts welded to pressure
vessels, materials shall be used which are supplied to material specifications covering at least
requirements for the chemical compositions and tensile properties.
These materials shall not limit the operating conditions of the material to which they are attached.
5.2 Yield strength and tensile strength of steels other than austenitic steels used for non- pressure
parts
5.2.1 For steel with specified minimum values of 0,2 % proof strength at elevated temperatures,
including ferritic and austenitic-ferritic steels in the annealed condition according to EN 10088-2:2024
and EN 10088-3:2023, the 0,2 % proof strength above 20 °C shall be determined in accordance with the
procedure as specified in 4.2.2.
5.2.2 For structural steels without specified elevated temperature properties, including those listed in
Table 5-2, the specified value of minimum yield strength R at room temperature can be used for R
eH p0,2/T
at temperatures less than or equal to 50 °C . The yield strength reduction factor for higher temperatures
are given in Table 5-1.
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Table 5-1 — Yield strength reduction factor for structural steel
Temperature °C 20 100 150 200 250 300 350
Factor K 1,000 0,800 0,730 0,660 0,590 0,520 0,450
c
Linear interpolation shall be performed between the values given in Table 5-1. For temperatures between
50 °C and 100 °C, interpolation shall be performed between 20 °C and 100 °C.
The values of the minimum yield strength R and tensile strength R shall be as given in the technical
eH m
specification for the material.
Table 5-2 — Steels used for non-pressure parts
Standard Steel grade
S235JR, S235J0, S235J2
EN 10025-2:2019 S275JR, S275J0, S275J2
S355JR, S355J0, S355J2, S355K2
S275N, S275NL
EN 10025-3:2019 S355N, S355NL
S275M, S275ML
EN 10025-4:2019+A1:2022 S355M, S355ML
S235J0W, S235J2W
EN 10025-5:2019 S355J0W. S355J2W, S355K2W
S355J0WP, S3J2WP
S235JRH
S275J0H, S275J2H
EN 10210-1:2006 S275NH, S275NHL
S355J0H, S355J2H, S355K2H
S355NH, S355NLH
S235JRH
EN 10219-1:2006 S275J0H, S275J2H
S275NH, S275NLH, S275MH,
S275MLH
S355J0H, S355J2H, S355K2H,
S355NH, S355NLH, S355MH,
S355MLH
5.2.3 The maximum values of the nominal design stress for normal operating, exceptional and testing
load cases shall be determined from the material properties as specified in 5.2.1 or 5.2.2 and the safety
factors given in EN 13445-3:2021, Clause 6.
EN 13445-2:2021+A1:2023/prA2:2025 (E)
5.3 Yield strength and tensile strength of austenitic steels used for non-pressure parts
5.3.1 For austenitic steels with specified minimum values of 0,2 % proof strength at elevated
temperatures, including austenitic steels according to EN 10088-2:2024, EN 10028-3:2023,
EN 10088-4:2009 and EN 10088-5:2009, the 0,2 % proof strength above 20 °C shall be determined in
accordance with the procedure as specified in 4.2.2.
5.3.2 For austenitic steels without specified minimum values of 0,2 % proof strength at elevated
temperatures, including austenitic steels according to EN 10088-2:2024, EN 10028-3:2023,
EN 10088-4:2009 and EN 10088-5:2009, the tensile strength above 20 °C shall be calculated as follows:
R = K *R (5.3-1)
m/T m m/20
where
K is obtained from Formula (5.3-2) or Table 5-3.
m
K = max (1,07-0,003 5*T; 0,82-000 09*T; 0,688-0,000 24*T) (5.3-2)
m
where
T is the temperature in °C.
Table 5-3 — Tensile strength reduction factor for austenitic steels
Temperature °C 20 50 100 150 200 250 300 350 400
Factor K 1,000 0,895 0,730 0,685 0,640 0,628 0,616 0,604 0,592
m
5.3.3 The maximum values of the nominal design stress for normal operating, exceptional and testing
condition shall be determined from the material properties as specified in 5.3.1 or 5.3.2 and the safety
factors given in EN 13445-3:2021, Clause 6.".
3 Modifications to B.2.2, “Method 1”
Replace Tables B.2-1, B.2-2, B.2-3, B.2-4, B.2-5, B.2-6 and B.2-7 with the following:
"Table B.2-1 ― Guide to material selection
Table Material or product form Steel group Clause
B.2-2 Plates and strips
B.2-3 Seamless and welded pipes
Ferritic steels B.2.2.2
B.2-4 Bars, forgings and fittings
B.2-5 Ferritic castings
Ni alloyed steels and castings
B.2-6
(1,5 < Ni ≤ 5 %)
Ferritic steels B.2.2.3
B.2-7 Ni-alloyed steel (9 % Ni)
B.2-8
Ferritic steels
B.2-9 Bolts and nuts B.2.2.4
Austenitic steels
B.2-10
B.2-11 Austenitic steel grades Austenitic steels B.2.2.5
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Table B.2-2 — General requirements for prevention of brittle fracture — Reference thicknesses
for plates and strips
Plates and strips
Max. reference
Design
Material
thickness
European
reference
Material
group to
e
B temperature
standard Grade Notes
CEN ISO/TR
No.
mm T
R
15608:2017
°C
AW PWHT
P235GH 1.0345 35 200
1.1
P265GH 1.0425 35 200
EN 10028-2:2017 – 20
P295GH 1.0481 35 110
1.2
P355GH 1.0473 35 70
P275NH 1.0487 35 200 – 20
P275NL1 1.0488 35 200 – 40 1.1
P275NL2 1.1104 35 200 – 50
EN 10028-3:2017 P355N 1.0562 35 70 – 20
P355NH 1.0565 35 70 – 20
1.2
P355NL1 1.0566 35 70 – 40
P355NL2 1.1106 35 70 – 50
11MnNi5-3 1.6212 35 80 – 60
EN 10028-4:2017 13MnNi6-3 1.6217 35 70 – 60 9.1
15NiMn6 1.6228 35 70 – 80
a
P355M 1.8821 35 - – 20
a
P355ML1 1.8832 35 - – 40 1.2
a
P355ML2 1.8833 35 - – 50
EN 10028-5:2017
a
P420M 1.8824 35 - – 20
a
P420ML1 1.8835 35 - – 40 2.1
a
P420ML2 1.8828 35 - – 50
P355Q 1.8866 35 70 – 20
P355QH 1.8867 35 70 – 20
EN 10028-6:2017 1.2
P355QL1 1.8868 35 70 – 40
P355QL2 1.8869 35 70 – 60
a
TMCP steels shall not be Post Weld Heat Treated.
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Table B.2-3 — General requirements for prevention of brittle fracture — Reference thicknesses
for seamless and welded tubes
Seamless and welded tubes
Max. reference
Design
Material
thickness
reference
European Material
group to
e
B temperature
Grade Notes
CEN ISO/TR
standard No.
mm T
R
15608:2017
°C
AW PWHT
a
P275NL1 1.0488 35 100 – 40
1.1
a
P275NL2 1.1104 35 100 – 50
P355N 1.0562 35 70 – 20
EN 10216-3:2013
P355NH 1.0565 35 70 – 20
1.2
P355NL1 1.0566 35 70 – 40
P355NL2 1.1106 35 70 – 50
a
P215NL 1.0451 10 10 – 40
a
P255QL 1.0452 35 40 – 40 1.1
a
P265NL 1.0453 25 25 – 40
EN 10216-4:2013
a
26CrMo4-2 1.7219 15 40 – 60 5.1
a
11MnNi5-3 1.6212 35 40 – 60 9.1
a
13MnNi6-3 1.6217 35 40 – 60 9.1
a
P275NL1 1.0488 35 40 – 40
1.1
a
P275NL2 1.1104 35 40 – 50
a
P355N 1.0562 35 40 – 20
EN 10217-3:2019
a
P355NH 1.0565 35 40 – 20
1.2
a
P355NL1 1.0566 35 40 – 40
a
P355NL2 1.1106 35 40 – 50
a
P215NL 1.0451 10 10 – 40 1.1
EN 10217-4:2019
a
P265NL 1.0453 16 16 – 40 1.1
a
P215NL 1.0451 10 10 – 40 1.1
EN 10217-6:2019
a
P265NL 1.0453 25 25 – 40 1.1
a
Thickness limitation results from wall thickness limitation in the European material standards and in the European
component standards respectively.
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Table B.2-4 — General requirements for prevention of brittle fracture with reference thickness
for bars, forgings and fittings
Bars, forgings and fittings
Max. reference
Design
Material
thickness
European Material reference
group to
Grade Notes
temperature
e CEN ISO/TR
B
standard No.
15608:2017
TR (°C)
AW PWHT
P275NH 1.0487 35 75 1.1
EN 10273:2016 P355NH 1.0565 35 55 – 20 1.2
P355QH 1.8867 35 55 1.2
EN 10222-3:2017 13MnNi6-3 1.6217 35 50 – 60 9.1
15NiMn6 1.6228 35 50 – 80 9.1
P285QH 1.0478 35 85 – 20 1.2
P355QH1 1.0571 35 60 – 20 1.2
P420QH 1.8936 35 50 – 20 3.1
P285NH 1.0477 35 95 – 20 1.2
P355NH 1.0565 35 70 – 20 1.2
P420NH 1.8932 35 67 – 20 1.3
EN 10222-
P355NL1 1.0566 35 70 – 40 1.2
4:2017+A1:2021
P355NL2 1.1106 35 70 – 50 1.2
P355QL1 1.8868 35 70 – 40 1.2
P355QL2 1.8869 35 70 – 40 1.2
P460QH 1.8871 35 65 – 20 3.1
P460QL1 1.8872 35 65 – 40 3.1
P460QL2 1.8864 35 65 – 50 3.1
EN 10253-2:2021 P355N 1.0562 35 70 – 20 1.2
P355NH 1.0565 35 70 – 20 1.2
P355NL1 1.0566 35 70 – 40 1.2
P215NL 1.0451 10 10 – 40 1.1
P265NL 1.0453 25 25 – 40 1.1
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Table B.2-5 — General requirements for prevention of brittle fracture with reference thickness
for ferritic castings
Ferritic castings
Max. reference
Design
Material
European
thickness
Material reference
group to
standard Grade Notes
temperature
e CEN ISO/TR
B
No.
15608:2017
TR (°C)
a
-
EN 10213:2007+ G17Mn5 1.1131 50 – 40 1.1
A1:2016
G20Mn5 1.6220 100 – 30 1.2
G18Mo5 1.5422 100 – 45 1.1
a
Heat treatment as specified in EN 10213:2007+A1:2016.
Table B.2-6 — General requirements for prevention of brittle fracture with reference thickness
for Ni-alloyed steels with 1,5 % < Ni ≤ 5 %
a
Ni-alloyed steel, 1,5 % < Ni ≤ 5 %
Max. reference
Design
Material
European
thickness
Material reference
group to
standard Grade Notes
e temperature
B CEN ISO/TR
No.
15608:2017
T (°C)
R
AW PWHT
plates and strips
b
12Ni14 1.5637 35 80 – 100
EN 10028-4:2017 9.2
X12Ni5 1.5680 35 50 – 120
seamless tubes
b
12Ni14 25 ― – 100
1.5637
b
12Ni14 35 40 – 90
EN 10216-4:2013 9.2
X12Ni5 25 ― – 120
1.5680
X12Ni5 35 40 – 110
fittings
b
12Ni14 1.5637 25 ― – 100
EN 10253-2:2021 9.2
b
12Ni14 35 40 – 90
forgings
b
12Ni14 35 ―
b
12Ni14 1.5637 35 50 – 100
b
EN 10222-3:2017 12Ni14 35 70 9.2
X12Ni5 35 ―
1.5680 – 120
X12Ni5 35 50
EN 13445-2:2021+A1:2023/prA2:2025 (E)
a
Ni-alloyed steel, 1,5 % < Ni ≤ 5 %
Max. reference
Design
Material
European
thickness
Material reference
group to
standard Grade Notes
e temperature
B CEN ISO/TR
No.
15608:2017
T (°C)
R
AW PWHT
castings
c, d
G9Ni10 1.5636 As per – 70 9.1
EN
G17NiCrMo 13-6 1.6781 – 80 9.2
EN 10213:2007+A1:
10213:2007+A1:
G9Ni14 1.5638 – 90 9.2
2016, Table 3
GXCrNi13-4 1.6982 – 120 9.2
NOTE Thickness limitation result from wall thickness limitation in European material standards.
a
Nickel content is nominal.
b
If used at – 105 °C (e. g. ethylene application), then 27 J shall be guaranteed at this temperature.
c
See EN 10213:2007+A1:2016, Table A.1 for recommended preheating and interpass temperature when welding is applied.
d
PWHT, if required, shall be performed in accordance with EN 13445-4:2021+A1:2023, Clause 10 with a minimum temperature
not lower than the temperature specified in EN 10213:2007+A1:2016, Table A.1.
Table B.2-7 — General requirements for prevention of brittle fracture with reference thickness
for Ni-alloyed steels with 9 % Ni
a
9 % - Ni alloys
Max. reference
Material
Design
European
group to
thickness
Material reference
standard Grade CEN ISO/TR Notes
temperature
eB
No.
15608:201
TR (°C)
AW PWHT
plates and strips
b
X8Ni9 1.5662
EN 10028-4:2017 ― – 196 9.3
b
X7Ni9 1.5663
seamless tubes and fittings
EN 10216-4:2013
b
X10Ni9 1.5682 ― – 196 9.3
EN 10253-2:2021
forgings
b
EN 10222-3:2017 X8Ni9 1.5662 ― – 196 9.3
a
Nickel content is nominal.
b
Materials can be used to maximum thickness permitted in harmonized European material standards.
”.
4 Modifications to B.2.3, “Method 2”
Add the following text before Table B.2-13 in B.2.3.1:
"For applications that fall below the dotted line in the Figures B.2-2 and B.2-4 (T below -60 °C with
R
T = 0 °C), steels shall be impact tested at -40 °C or at lower temperatures.".
A
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Replace Figures B.2-2 and B.2-4 in B.2.3.3 with the following:
“
Key
T design reference temperature
R
T material impact test temperature
KV
e reference thickness
B
For applications that fall below the dotted line (T below -60 °C with T = 0 °C), test temperature T shall
R A KV
not be higher than -40 °C independent of thickness e .
B
If any combination of thickness e and T result in a lower test temperature T as -40 °C, the lower test
B R KV
temperature shall be taken, always rounded up to the next lowest level (e.g T =-63 °C becomes T = -
KV KV
70 °C).
Figure B.2-2 — METHOD 2: Design reference temperature and impact test temperature as-
welded (AW) condition, for Re ≤ 265 MPa and KV ≥ 27 J
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Key
T design reference temperature
R
T material impact test temperature
KV
e reference thickness
B
For applications that fall below the dotted line (T below -60 °C with T = 0 °C), test temperature T shall
R A KV
not be higher than -40 °C independent of thickness e .
B
If any combination of thickness e and T result in a lower test temperature T as -40 °C, the lower test
B R KV
temperature shall be taken, always rounded up to the next lowest level (e.g T =-63 °C becomes T = -
KV KV
70 °C).
Figure B.2-4 — METHOD 2: Design reference temperature and impact test temperature as-
welded (AW) condition, Re ≤ 355 MPa and KV ≥ 27 J
.”
5 Modifications to E.2, “European standardised steels grouped according to
product forms”
Delete the first sentence.
Replace Table E.2-1 with the following:
EN 13445-2:2021+A1:2023/prA2:2025 (E)
“Table E.2-1 — European standardised steels grouped according to product forms
Material
Max.
European Material group to
b
Product form Grade thickness Notes
standard number CEN ISO/TR
mm
15608:2017
plate and strip EN 10028-2 P235GH 1.0345 250 1.1
plate and strip EN 10028-2 P265GH 1.0425 250 1.1
plate and strip EN 10028-2 P295GH 1.0481 250 1.2
plate and strip EN 10028-2 P355GH 1.0473 250 1.2
plate and strip EN 10028-2 16Mo3 1.5415 250 1.2
plate and strip EN 10028-2 18MnMo4-5 1.5414 250 1.2
plate and strip EN 10028-2 20MnMoNi4-5 1.6311 250 3.1
plate and strip EN 10028-2 15NiCuMoNb5-6-4 1.6368 200 3.1
plate and strip EN 10028-2 13CrMo4-5 1.7335 250 5.1
plate and strip EN 10028-2 13CrMoSi5-5 1.7336 100 5.1
plate and strip EN 10028-2 10CrMo9-10 1.7380 250 5.2
plate and strip EN 10028-2 12CrMo9-10 1.7375 250 5.2
plate and strip EN 10028-2 X12CrMo5 1.7362 250 5.3
plate and strip EN 10028-2 13CrMoV9-10 1.7703 250 6.2
plate and strip EN 10028-2 12CrMoV12-10 1.7767 250 6.2
plate and strip EN 10028-2 X10CrMoVNb9-1 1.4903 250 6.4
plate and strip EN 10028-3 P275NH 1.0487 250 1.1
plate and strip EN 10028-3 P275NL1 1.0488 250 1.1
plate and strip EN 10028-3 P275NL2 1.1104 250 1.1
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Material
Max.
European Material group to
b
Product form Grade thickness Notes
standard number CEN ISO/TR
mm
15608:2017
plate and strip EN 10028-3 P355N 1.0562 250 1.2
plate and strip EN 10028-3 P355NH 1.0565 250 1.2
plate and strip EN 10028-3 P355NL1 1.0566 250 1.2
plate and strip EN 10028-3 P355NL2 1.1106 250 1.2
plate and strip EN 10028-3 P420NH 1.8932 250 1.3
plate and strip EN 10028-3 P420NL1 1.8912 250 1.3
plate and strip EN 10028-3 P420NL2 1.8913 250 1.3
plate and strip EN 10028-3 P460NH 1.8935 250 1.3
plate and strip EN 10028-3 P460NL1 1.8915 250 1.3
plate and strip EN 10028-3 P460NL2 1.8918 250 1.3
plate and strip EN 10028-4 11MnNi5-3 1.6212 80 9.1
plate and strip EN 10028-4 13MnNi6-3 1.6217 80 9.1
plate and strip EN 10028-4 15NiMn6 1.6228 80 9.1
plate and strip EN 10028-4 12Ni14 1.5637 80 9.2
plate and strip EN 10028-4 X12Ni5 1.5680 50 9.2
plate and strip EN 10028-4 X8Ni9+QT640 1.5662 125 9.3
plate and strip EN 10028-4 X8Ni9+QT680 1.5662 125 9.3
plate and strip EN 10028-4 X7Ni9 1.5663 125 9.3
d
plate and strip EN 10028-5 P355M 1.8821 63 1.2
d
plate and strip EN 10028-5 P355ML1 1.8832 63 1.2
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Material
Max.
European Material group to
b
Product form Grade thickness Notes
standard number CEN ISO/TR
mm
15608:2017
d
plate and strip EN 10028-5 P355ML2 1.8833 63 1.2
d
plate and strip EN 10028-5 P420M 1.8824 63 2.1
d
plate and strip EN 10028-5 P420ML1 1.8835 63 2.1
d
plate and strip EN 10028-5 P420ML2 1.8828 63 2.1
d
plate and strip EN 10028-5 P460M 1.8826 63 2.1
d
plate and strip EN 10028-5 P460ML1 1.8837 63 2.1
d
plate and strip EN 10028-5 P460ML2 1.8831 63 2.1
plate and strip EN 10028-6 P355Q 1.8866 200 1.2
plate and strip EN 10028-6 P355QH 1.8867 200 1.2
plate and strip EN 10028-6 P355QL1 1.8868 200 1.2
plate and strip EN 10028-6 P355QL2 1.8869 200 1.2
plate and strip EN 10028-6 P460Q 1.8870 200 3.1
plate and strip EN 10028-6 P460QH 1.8871 200 3.1
plate and strip EN 10028-6 P460QL1 1.8872 200 3.1
plate and strip EN 10028-6 P460QL2 1.8864 200 3.1
plate and strip EN 10028-6 P500Q 1.8873 200 3.1
plate and strip EN 10028-6 P500QH 1.8874 200 3.1
plate and strip EN 10028-6 P500QL1 1.8875 200 3.1
plate and strip EN 10028-6 P500QL2 1.8865 200 3.1
plate and strip EN 10028-6 P690Q 1.8879 200 3.1
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Material
Max.
European Material group to
b
Product form Grade thickness Notes
standard number CEN ISO/TR
mm
15608:2017
plate and strip EN 10028-6 P690QH 1.8880 200 3.1
plate and strip EN 10028-6 P690QL1 1.8881 200 3.1
plate and strip EN 10028-6 P690QL2 1.8888 200 3.1
plate and strip EN 10028-7 X2CrNiN18-7 1.4318 75 8.1
plate and strip EN 10028-7 X2CrNi18-9 1.4307 75 8.1
plate and strip EN 10028-7 X2CrNi19-11 1.4306 75 8.1
plate and strip EN 10028-7 X2CrNiN18-10 1.4311 75 8.1
plate and strip EN 10028-7 X5CrNi18-10 1.4301 75 8.1
plate and strip EN 10028-7 X5CrNiN19-9 1.4315 75 8.1
plate and strip EN 10028-7 X6CrNi18-10 1.4948 75 8.1
plate and strip EN 10028-7 X6CrNi23-13 1.4950 75 8.2
plate and strip EN 10028-7 X6CrNi25-20 1.4951 75 8.2
plate and strip EN 10028-7 X6CrNiTi18-10 1.4541 75 8.1
plate and strip EN 10028-7 X6CrNiTiB18-10 1.4941 75 8.1
plate and strip EN 10028-7 X2CrNiMo17-12-2 1.4404 75 8.1
plate and strip EN 10028-7 X2CrNiMoN17-12-2 1.4406 75 8.1
plate and strip EN 10028-7 X5CrNiMo17-12-2 1.4401 75 8.1
plate and strip EN 10028-7 X6CrNiMoTi17-12-2 1.4571 75 8.1
plate and strip EN 10028-7 X2CrNiMo17-12-3 1.4432 75 8.1
plate and strip EN 10028-7 X2CrNiMo18-14-3 1.4435 75 8.1
EN 13445-2:2021+A1:2023/prA2:2025 (E)
Material
Max.
European Material group to
b
Product form Grade thickness Notes
standard number CEN ISO/TR
mm
15608:2017
plate and strip EN 10028-7 X2CrNiMoN17-13-5 1.4439 75 8.1
plate and strip EN 10028-7 X1NiCrMoCu25-20-5 1.4539 75 8.2
plate and strip EN 10028-7 X5NiCrAlTi31-20 1.4958 75 8.2
plate and strip EN 10028-7 X8NiCrAlTi32-21 1.4959 75 8.2
plate and strip EN 10028-7 X3CrNiMoBN17-13-3 1.4910 75 8.2
plate and strip EN 10028-7 X1CrNi25-21 1.4335 75 8.2
plate and strip EN 10028-7 X6CrNiNb18-10 1.4550 75 8.1
plate and strip EN 10028-7 X8CrNiNb16-13 1.4961 75 8.1
plate and strip EN 10028-7 X1CrNiMoN25-22-2 1.4466 75 8.2
plate and strip EN 10028-7 X6CrNiMoNb17-12-2 1.4580 75 8.1
plate and strip EN 10028-7 X2CrNiMoN17-13-3 1.4429 75 8.1
plate and strip EN 10028-7 X3CrNiMoN17-13-3 1.4436 75 8.1
plate and strip EN 10028-7 X2CrNiMoN18-12-4 1.4434 75 8.1
plate and strip EN 10028-7 X2CrNiMo18-15-4 1.4438 75 8.1
plate and strip EN 10028-7 X1NiCrMoCu31-27-4 1.4563 75 8.2
plate and strip EN 10028-7 X1CrNiMoCuN25-25-5 1.4537 75 8.2
plate and strip EN 10028-7 X1CrNiMoCuN20-18-7 1.4547 75 8.2
plate and strip EN 10028-7 X1NiCrMoCuN25-20-7 1.4529 75 8.2
plate and strip EN 10028-7 X2CrNiN23-4 1.4362 50 10.1
plate and strip EN 10028-7 X2CrNiMoN22-5-3 1.4462 75 10.1
...