ISO 9328-2:2018

INTERNATIONAL ISO
STANDARD 9328-2
Fourth edition
2018-02
Steel flat products for pressure
purposes — Technical delivery
conditions —
Part 2:
Non-alloy and alloy steels with
specified elevated temperature
properties
Produits plats en acier pour service sous pression — Conditions
techniques de livraison —
Partie 2: Aciers non alliés et aciers alliés avec caractéristiques
spécifiées à température élevée
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification and designation . 1
4.1 Classification . 1
4.2 Designation . 2
5 Information to be supplied by the purchaser. 2
5.1 Mandatory information . 2
5.2 Options . 2
5.3 Example for ordering . 3
6 Requirements . 3
6.1 Steelmaking process . 3
6.2 Delivery condition . 3
6.3 Chemical composition . 4
6.4 Mechanical properties . 5
6.5 Surface condition . 5
6.6 Internal soundness . 5
6.7 Weldability . 5
6.8 Dimensions and tolerances on dimensions . 6
6.9 Calculation of mass . 6
6.10 Resistance to hydrogen-induced cracking. 6
6.11 Embrittlement of CrMo steels . 6
7 Inspection . 6
7.1 Types of inspection and inspection documents . 6
7.2 Tests to be carried out . 6
7.3 Retests, sorting and reprocessing . 6
8 Sampling . 6
9 Test methods . 6
10 Marking . 7
Annex A (normative) Chemical composition and mechanical properties of products based
on European standards . 8
Annex B (normative) Chemical composition and mechanical properties of products based
on ASTM/ASME or JIS standards .17
Annex C (informative) Steel designations in accordance with this document and
designation of comparable steel grades in national or regional standards .22
Annex D (informative) Guidelines for heat treatment .24
Annex E (informative) Critical time-temperature parameter P and possible
crit.
combinations of stress relieving temperature and holding time .26
Annex F (informative) Reference data relating to strength for 1 % (plastic) creep strain and
creep rupture .27
Annex G (informative) Evaluation of resistance to hydrogen-induced cracking .33
Annex H (informative) Step cooling test .34
Bibliography .35
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
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constitute an endorsement.
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expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 10, Steel for
pressure purposes.
This fourth edition cancels and replaces the third edition (ISO 9328-2:2011), which has been technically
revised. The following changes have been made:
— the term “product thickness” has been replaced with “nominal thickness”;
— normalizing rolling is also considered for steel grade 16Mo3 (see Annex A);
— the technical data in Annex A have been aligned with EN 10028-2;
— in Table B.1, “B ≤ 0,001 0” has been added and the specifications of “P” and “S” have been changed.
A list of all the parts in the ISO 9328 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 9328-2:2018(E)
Steel flat products for pressure purposes — Technical
delivery conditions —
Part 2:
Non-alloy and alloy steels with specified elevated
temperature properties
1 Scope
This document specifies the technical delivery conditions for plates and strip for pressure equipment
made of non-alloy and alloy steels as specified in Tables A.1 and B.1. The requirements and definitions
of ISO 9328-1 also apply to this document.
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.
ISO 4948-1, Steels — Classification — Part 1: Classification of steels into unalloyed and alloy steels based
on chemical composition
ISO 4948-2, Steels — Classification — Part 2: Classification of unalloyed and alloy steels according to main
quality classes and main property or application characteristics
ISO 9328-1:2018, Steel flat products for pressure purposes — Technical delivery conditions — Part 1:
General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9328-1 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
4 Classification and designation
4.1 Classification
In accordance with ISO 4948-1 and ISO 4948-2, the steel grades P235GH, P265GH, P295GH and P355GH
(see Annex A) and PT410GH, PT450GH and PT480GH (see Annex B) are non-alloy-quality steels. All
other grades are alloyed special steels.
4.2 Designation
Shall be in accordance with ISO 9328-1.
NOTE 1 Non-alloy grades in Annex A are classified in accordance with their yield strength, non-alloy grades in
Annex B are classified in accordance with their tensile strength.
NOTE 2 Information on the designation of comparable steel grades in national or regional standards is given
in Annex C.
5 Information to be supplied by the purchaser
5.1 Mandatory information
Shall be in accordance with ISO 9328-1 and 6.2.3.
5.2 Options
A number of options are specified in this document. These are listed below under a) to t). Additionally,
the relevant options of ISO 9328-1 apply. If the purchaser does not indicate a wish to implement any of
these options at the time of enquiry and order, the products shall be supplied in accordance with the
basic specificatio
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