Steel flat products for pressure purposes — Technical delivery conditions — Part 7: Stainless steels

ISO 9328-7:2018 specifies requirements for flat products for pressure purposes made of stainless steels, including austenitic creep-resisting steels, in thicknesses as specified in Tables 7 to 10. The requirements and definitions of ISO 9328‑1 also apply to this document.

Produits plats en acier pour service sous pression — Conditions techniques de livraison — Partie 7: Aciers inoxydables

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Published
Publication Date
31-Jan-2018
Current Stage
6060 - International Standard published
Start Date
01-Feb-2018
Completion Date
01-Feb-2018
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INTERNATIONAL ISO
STANDARD 9328-7
Third edition
2018-02
Steel flat products for pressure
purposes — Technical delivery
conditions —
Part 7:
Stainless steels
Produits plats en acier pour service sous pression — Conditions
techniques de livraison —
Partie 7: Aciers inoxydables
Reference number
ISO 9328-7:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 9328-7:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 9328-7:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Classification and designation ............................................................................................................................................................... 1

5 Information to be supplied by the purchaser......................................................................................................................... 2

5.1 Mandatory information ................................................................................................................................................................... 2

5.2 Options ........................................................................................................................................................................................................... 2

5.3 Example for ordering ......................................................................................................................................................................... 2

6 Requirements .......................................................................................................................................................................................................... 2

6.1 Steelmaking process ........................................................................................................................................................................... 2

6.2 Delivery condition ................................................................................................................................................................................ 2

6.3 Chemical composition and chemical corrosion properties .............................................................................. 2

6.4 Mechanical properties ...................................................................................................................................................................... 2

6.5 Surface condition .................................................................................................................................................................................. 3

6.6 Internal soundness .............................................................................................................................................................................. 3

6.7 Post-weld heat treatment .............................................................................................................................................................. 3

6.8 Dimensions and tolerances .......................................................................................................................................................... 3

6.9 Calculation of mass .............................................................................................................................................................................. 3

6.10 Physical properties .............................................................................................................................................................................. 3

7 Inspection .................................................................................................................................................................................................................... 3

7.1 Types of inspection and inspection documents ......................................................................................................... 3

7.2 Tests to be carried out ...................................................................................................................................................................... 3

7.3 Re-tests .......................................................................................................................................................................................................... 3

8 Sampling ........................................................................................................................................................................................................................ 4

8.1 Frequency of testing ........................................................................................................................................................................... 4

8.2 Selection and preparation of samples and test pieces .......................................................................................... 4

9 Test methods ............................................................................................................................................................................................................. 4

10 Marking .......................................................................................................................................................................................................................... 4

Annex A (informative) Steel designations in accordance with this document and

designation of comparable steel grades in national or regional standards ........................................30

Annex B (informative) Guidelines for further treatment (including heat treatment)

in fabrication .........................................................................................................................................................................................................32

Annex C (informative) Post-weld heat treatment.................................................................................................................................36

Annex D (informative) Preliminary reference data for the tensile strength of austenitic-

ferritic steels at elevated temperatures ....................................................................................................................................39

Annex E (informative) Reference data on strength values for 1 % (plastic) creep strain and

creep rupture ........................................................................................................................................................................................................40

Annex F (informative) Reference data on mechanical properties of austenitic steels at room

temperature and at low temperature ..........................................................................................................................................47

Annex G (informative) Reference data on some physical properties ..............................................................................49

Annex H (informative) Numbering of steel grades in accordance with ISO 15510 ...........................................56

Bibliography .............................................................................................................................................................................................................................58

© ISO 2018 – All rights reserved iii
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ISO 9328-7:2018(E)
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

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

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).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

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 third edition cancels and replaces the second edition (ISO 9328-7:2011), which has been technically

revised. The following changes have been made:
— the term “product thickness” has been replaced with “nominal thickness”;

— new steel grades X1CrNiSI18-5-4, X2CrCuNbTiV22-1, X2CrNiMoN21-9-1, X2CrMnNiN21-5-1 and

X2CrNiMnMoCuN24-4-3-2 and all their technical data have been added;
— the technical data in Table 5 have been revised;
— the technical data in Table 9 have been aligned with EN 10028-7.
A list of all the parts in the ISO 9328 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
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ISO 9328-7:2018(E)
Introduction

The International Organization for Standardization (ISO) draws attention to the fact that it is claimed

that compliance with this document may involve the use of patents concerning eight steel grades.

ISO takes no position concerning the evidence, validity and scope of this patent right. The holder of

this patent right has assured ISO that he/she is willing to negotiate licences under reasonable and

non-discriminatory terms and conditions with applicants throughout the world. In this respect, the

statement of the holder of this patent right is registered with ISO. Information may be obtained from

the following sources.

For steel grades 1.4162 (but also consider footnote in Table 4) and 1.4662 from:

Outokumpu Stainless AB
SE-77480 AVESTA, Sweden
For steel grades 1.4420 and 1.4622 from:
Outokumpu Oyj
FI-02200 Espoo, Finland

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights other than those identified above. ISO shall not be held responsible for identifying any or

all such patent rights.
© ISO 2018 – All rights reserved v
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INTERNATIONAL STANDARD ISO 9328-7:2018(E)
Steel flat products for pressure purposes — Technical
delivery conditions —
Part 7:
Stainless steels
1 Scope

This document specifies requirements for flat products for pressure purposes made of stainless steels,

including austenitic creep-resisting steels, in thicknesses as specified in Tables 7 to 10.

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 3651-2, Determination of resistance to intergranular corrosion of stainless steels — Part 2:

Ferritic,austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in media containing

sulfuric acid

ISO 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 and the following 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
cryogenic temperature
temperature lower than −75 °C used in the liquefaction of gases
4 Classification and designation
Shall be in accordance with ISO 9328-1.

NOTE 1 Information on the designation of comparable steel grades in national or regional standards is given

in Annex A.
NOTE 2 Information on numbering of steel grades is in accordance with ISO 15510.
© ISO 2018 – All rights reserved 1
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ISO 9328-7:2018(E)
5 Information to be supplied by the purchaser
5.1 Mandatory information
Shall be in accordance with ISO 9328-1.
5.2 Options
The relevant options of ISO 9328-1 apply.
5.3 Example for ordering

An order of 10 plates made of a steel grade with the name X5CrNi18-10 as specified in this document

with nominal dimensions thickness = 8 mm, width = 2 000 mm, length = 5 000 mm and tolerances

on dimensions, shape and mass as specified in ISO 18286, with “normal” flatness tolerance in process

route 1D (see Table 6), and with inspection certificate 3.1 as specified in ISO 10474 is designated as

follows:

10 plates ISO 18286 – 8 × 2 000 × 5 000 N – Steel ISO 9328-7 – X5 CrNi18-10 + 1D – Inspection

certificate 3.1
6 Requirements
6.1 Steelmaking process
Shall be in accordance with ISO 9328-1.
6.2 Delivery condition

The products shall be supplied in the delivery condition specified in the order by reference to the process

route given in Table 6 and, where alternatives exist, to the treatment conditions given in Tables 7 to 10.

Guidelines for further treatment, including heat treatment, are given in Annex B.

6.3 Chemical composition and chemical corrosion properties

6.3.1 The chemical composition requirements given in Tables 1 to 4 apply in respect of the chemical

composition according to the cast analysis.

6.3.2 The product analysis may deviate from the limiting values for the cast analysis given in Tables 1

to 4 by the values listed in Table 5.

6.3.3 Referring to resistance to intergranular corrosion as defined in ISO 3651-2, for ferritic, austenitic

and austenitic-ferritic steels, the specifications in Tables 7, 9 and 10 apply.
NOTE 1 ISO 3651-2 is not applicable for testing martensitic steels.

NOTE 2 The corrosion resistance of stainless steels is very dependent on the type of environment and can

therefore not always be clearly ascertained through laboratory tests. It is therefore advisable to draw on the

available experience of the use of the steels.
6.4 Mechanical properties

6.4.1 The tensile properties at room temperature and the impact energy at room temperature and at

low temperature, as specified in Tables 7 to 10, apply for the relevant specified heat treatment condition.

2 © ISO 2018 – All rights reserved
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ISO 9328-7:2018(E)

NOTE Austenitic steels are insensitive to brittle fracture in the solution annealed condition. Because they

do not have a pronounced transition temperature, which is characteristic of other steels, they are also useful for

application at cryogenic temperatures.

6.4.2 The values in Tables 11 to 14 apply for the 0,2 % and 1,0 % proof strength at elevated

temperatures. Additionally, the values in Table 15 apply for the tensile strength at elevated temperatures

of austenitic steels.

Tensile strength values at elevated temperatures for austenitic-ferritic steels are given for guidance in

Annex D.

6.4.3 Annex E provides for the purchaser mean values as preliminary data on the strength for 1 %

(plastic) creep strain and creep rupture. These data apply for the solution annealed condition only.

6.4.4 In Annex F, preliminary data on mechanical properties at low temperatures of austenitic steels

are listed.
6.5 Surface condition
Shall be in accordance with ISO 9328-1 and Table 6.
6.6 Internal soundness
Shall be in accordance with ISO 9328-1.
6.7 Post-weld heat treatment
Guidelines for the purchaser on post-weld heat treatment are given in Annex C.
6.8 Dimensions and tolerances
Shall be in accordance with ISO 9328-1.
6.9 Calculation of mass
For density of steels, see Annex G.
6.10 Physical properties
Reference data on some physical properties are given in Annex G.
7 Inspection
7.1 Types of inspection and inspection documents
Shall be in accordance with ISO 9328-1.
7.2 Tests to be carried out
Shall be in accordance with Table 16 and ISO 9328-1.
7.3 Re-tests
Shall be in accordance with ISO 9328-1.
© ISO 2018 – All rights reserved 3
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ISO 9328-7:2018(E)
8 Sampling
8.1 Frequency of testing
Shall be in accordance with Table 16 and ISO 9328-1.
8.2 Selection and preparation of samples and test pieces
Shall be in accordance with ISO 9328-1.
9 Test methods
Shall be in accordance with ISO 9328-1.
10 Marking
Shall be in accordance with ISO 9328-1.
4 © ISO 2018 – All rights reserved
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ISO 9328-7:2018(E)
© ISO 2018 – All rights reserved 5
Table 1 — Chemical composition (cast analysis) of ferritic steels
mass fraction, %
Steel grade C Si Mn P S N Cr Mo Nb Ni Ti
max. max. max. max. max. max.
0,30 to
X2CrNi12 0,030 1,00 1,50 0,040 0,015 0,030 10,5 to 12,5 — — —
1,10
0,50 to
X6CrNiTi12 0,08 1,00 1,00 0,040 0,015 — 10,5 to 12,5 — — 0,05 to 0,35
1,50
X2CrTi17 0,025 0,50 0,50 0,040 0,015 0,015 16,0 to 18,0 — — — 0,30 to 0,60
[4 × (C + N) + 0,15] to
X3CrTi17 0,05 1,00 1,00 0,040 0,015 — 16,0 to 18,0 — — —
0,80
0,80 to
X2CrMoTi17-1 0,025 1,00 1,00 0,040 0,015 0,030 16,0 to 18,0 — — 0,30 to 0,60
1,40
1,80 to [4 × (C + N) + 0,15] to
X2CrMoTi18-2 0,025 1,00 1,00 0,040 0,015 0,030 17,0 to 20,0 — —
2,50 0,80
0,80 to [7 × (C + N) + 0,10] to
X6CrMoNb17-1 0,08 1,00 1,00 0,040 0,015 0,040 16,0 to 18,0 — —
1,40 1,00

X2CrTiNb18 0,030 1,00 1,00 0,040 0,015 — 17,5 to 18,5 — [3 × C + 0,30] to 1,00 — 0,10 to 0,60

X 2Cr Cu N bT iV 22-1
0,030 1,00 0,80 0,040 0,015 0,030 20,0 to 24,0 — 0,10 to 0,70 — 0,10 to 0,70
d,e

Elements not listed in this table may not be intentionally added to the steel without agreement of the purchaser, except for finishing of the cast. All appropriate precautions are

to be taken to avoid the addition of such elements from scrap and other materials used in production, which would impair mechanical properties and the suitability of the steel.

Information concerning ISO steel numbers and designations according to other regional or national standards is given in Annex A.

The stabilization may be made by use of titanium and/or niobium and/or zirconium. According to the atomic number of these elements and the content of carbon and nitrogen,

the equivalence shall, if additional stabilizing with niobium or zirconium is used, be the following:

Nb==Zr Ti .
Patented steel.

Other elements: V: 0,03 to 0,50 %; Cu: 0,30 to 0,80 %; Ti + Nb: 8x(C+N) to 0,80 %.

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ISO 9328-7:2018(E)
6 © ISO 2018 – All rights reserved
Table 2 — Chemical composition (cast analysis) of martensitic steels
mass fraction, %
Steel grade C Si Mn P S N Cr Mo Ni
max. max. max. max. max. min.

X3CrNiMo13-4 0,05 0,70 0,50 to 1,00 0,040 0,015 0,020 12,0 to 14,0 0,30 to 1,00 3,5 to 4,5

X4CrNiMo16-5-1 0,06 0,70 1,50 0,040 0,015 0,020 15,0 to 17,0 0,80 to 1,50 4,0 to 6,0

Elements not listed in this table may not be intentionally added to the steel without the agreement of the purchaser, except for finishing of the cast. All appropriate precautions

are to be taken to avoid the addition of such elements from scrap and other materials used in production, which would impair mechanical properties and the suitability of the steel.

Information concerning ISO steel numbers and designations according to other regional or national standards is given in Annex A.

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ISO 9328-7:2018(E)
© ISO 2018 – All rights reserved 7
Table 3 — Chemical composition (cast analysis) of austenitic steels
mass fraction, %
Steel grade C Si Mn P S N Cr Cu Mo Nb Ni Ti Others
max. max. max.
Austenitic corrosion-resisting grades
0,10 to 16,5 to 6,0 to
X2CrNiN18-7 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 — — — — —
0,20 18,5 8,0
17,5 to 8,0 to
X2CrNi18-9 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 ≤ 0,10 — — — — —
19,5 10,5
18,0 to 10,0 to
X2CrNi19-11 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 ≤ 0,10 — — — — —
20,0 12,0
0,12 to 18,0 to 8,0 to
X5CrNiN19-9 ≤ 0,06 ≤ 1,00 2,00 0,045 0,015 — — — — —
0,22 20,0 11,0
0,12 to 17,5 to 8,0 to
X2CrNiN18-10 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 — — — — —
0,22 19,5 11,5
17,5 to 8,0 to
X5CrNi18-10 ≤ 0,07 ≤ 1,00 2,00 0,045 0,015 ≤ 0,10 — — — — —
19,5 10,5
17,0 to 9,0 to
X6CrNiTi18-10 ≤ 0,08 ≤ 1,00 2,00 0,045 0,015 — — — — 5 × C to 0,70 —
19,0 12,0
17,0 to 10 × C to 9,0 to
X6CrNiNb18-10 ≤ 0,08 ≤ 1,00 2,00 0,045 0,015 — — — — —
19,0 1,00 12,0
24,0 to 20,0 to
X1CrNi25-21 ≤ 0,020 ≤ 0,25 2,00 0,025 0,010 ≤ 0,10 — ≤ 0,20 — — —
26,0 22,0
16,5 to 2,00 to 10,0 to
X2CrNiMo17-12-2 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 ≤ 0,10 — — — —
18,5 2,50 13,0
0,12 to 16,5 to 2,00 to 10,0 to
X2CrNiMoN17-11-2 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 — — — —
0,22 18,5 2,50 12,5
16,5 to 2,00 to 10,0 to
X5CrNiMo17-12-2 ≤ 0,07 ≤ 1,00 2,00 0,045 0,015 ≤ 0,10 — — — —
18,5 2,50 13,0
0,10 to 24,0 to 2,00 to 21,0 to
X1CrNiMoN25-22-2 ≤ 0,020 ≤ 0,70 2,00 0,025 0,010 — — — —
0,16 26,0 2,50 23,0
16,5 to 2,00 to 10,5 to
X6CrNiMoTi17-12-2 ≤ 0,08 ≤ 1,00 2,00 0,045 0,015 — — — 5 × C to 0,70 —
18,5 2,50 13,5

Elements not listed in this table may not be intentionally added to the steel without the agreement of the purchaser, except for finishing of the cast. All appropriate precautions are to be taken to

avoid the addition of such elements from scrap and other materials used in production, which would impair mechanical properties and the suitability of the steel.

Information concerning ISO steel numbers and designations according to other regional or national standards is given in Annex A.

Patented steel.
---------------------- Page: 12 ----------------------
ISO 9328-7:2018(E)
8 © ISO 2018 – All rights reserved
Table 3 (continued)
mass fraction, %
Steel grade C Si Mn P S N Cr Cu Mo Nb Ni Ti Others
max. max. max.
16,5 to 2,00 to 10 × C to 10,5 to
X6CrNiMoNb17-12-2 ≤ 0,08 ≤ 1,00 2,00 0,045 0,015 — — —
18,5 2,50 1,00 13,5
16,5 to 2,50 to 10,5 to
X2CrNiMo17-12-3 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 ≤ 0,10 — — — —
18,5 3,00 13,0
0,12 to 16,5 to 2,50 to 11,0 to
X2CrNiMoN17-13-3 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 — — — —
0,22 18,5 3,00 14,0
16,5 to 2,50 to 10,5 to
X3CrNiMo17-12-3 ≤ 0,05 ≤ 1,00 2,00 0,045 0,015 ≤ 0,10 — — — —
18,5 3,00 13,0
17,0 to 2,50 to 12,5 to
X2CrNiMo18-14-3 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 ≤ 0,10 — — — —
19,0 3,00 15,0
0,10 to 16,5 to 3,0 to 10,5 to
X2CrNiMoN18-12-4 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 — — — —
0,20 19,5 4,0 14,0
17,5 to 3,0 13,0 to
X2CrNiMo18-15-4 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 ≤ 0,10 — — — —
19,5 to 4,0 16,0
0,12 to 16,5 to 4,0 12,5 to
X2CrNiMoN17-13-5 ≤ 0,030 ≤ 1,00 2,00 0,045 0,015 — — — —
0,22 18,5 to 5,0 14,5
26,0 to 0,70 to 3,0 to 30,0 to
X1NiCrMoCu31-27-4 ≤ 0,020 ≤ 0,70 2,00 0,030 0,010 ≤ 0,10 — — —
28,0 1,50 4,0 32,0
19,0 to 1,20 to 4,0 to 24,0 to
X1NiCrMoCu25-20-5 ≤ 0,020 ≤ 0,70 2,00 0,030 0,010 ≤ 0,15 — — —
21,0 2,00 5,0 26,0
3,7 to 16,5 to 14,0 to
X1CrNiSi18-15-4 ≤ 0,015 ≤ 2,00 0,025 0,010 ≤ 0,10 — ≤ 0,20 — — —
4,5 18,5 16,0
0,14 to 19,5 to 0,50 to 8,0 to
X2CrNiMoN21-9-1 ≤ 0,03 ≤ 1,00 ≤ 2,00 0,045 0,015 ≤ 1,00 — — —
0,25 21,5 1,50 9,5
Austenitic corrosion-resisting grades
0,17 to 24,0 to 1,00 to 4,7 to 24,0 to
X1CrNiMoCuN25-25-5 ≤ 0,020 ≤ 0,70 2,00 0,030 0,010 — — —
0,25 26,0 2,00 5,7 27,0
0,18 to 19,5 to 0,50 to 6,0 to 17,5 to
X1CrNiMoCuN20-18-7 ≤ 0,020 ≤ 0,70 1,00 0,030 0,010 — — —
0,25 20,5 1,00 7,0 18,5

Elements not listed in this table may not be intentionally added to the steel without the agreement of the purchaser, except for finishing of the cast. All appropriate precautions are to be taken to

avoid the addition of such elements from scrap and other materials used in production, which would impair mechanical properties and the suitability of the steel.

Information concerning ISO steel numbers and designations according to other regional or national standards is given in Annex A.

Patented steel.
---------------------- Page: 13 ----------------------
ISO 9328-7:2018(E)
© ISO 2018 – All rights reserved 9
Table 3 (continued)
mass fraction, %
Steel grade C Si Mn P S N Cr Cu Mo Nb Ni Ti Others
max. max. max.
0,15 to 19,0 to 0,50 to 6,0 to 24,0 to
X1NiCrMoCuN25-20-7 ≤ 0,020 ≤ 0,50 2,00 0,030 0,010 — — —
0,25 21,0 1,50 7,0 26,0
0,15 to 16,0 to 3,5 to
X2CrMnNiN17-7-5 < 0,030 ≤ 1,00 6,0 to 8,0 0,045 0,015 — — — — —
0,20 17,0 5,5
16,5 to 1,00 to 4,5 to
X9CrMnNiCu17-8-5-2 ≤ 0,10 ≤ 1,00 5,5 to 9,5 0,070 0,010 ≤ 0,15 — — — —
18,5 2, 50 5,5
Austenitic creep-resisting grades
0,10 to 16,0 to 2,00 to 12,0 to 0,001 5 to
X3CrNiMoBN17-13-3 ≤ 0,04 ≤ 0,75 2,00 0,035 0,015 — — —
0,18 18,0 3,00 14,0 0,005 0 B
0,04 to 17,0 to 9,0 to 5 × C 0,001 5 to
X6CrNiTiB18-10 ≤ 1,00 2,00 0,035 0,015 — — — —
0,08 19,0 12,0 to 0,70 0,005 0 B
0,04 to 17,0 to 8,0 to
X6CrNi18-10 ≤ 1,00 2,00 0,035 0,015 ≤ 0,10 — — — — —
0,08 19,0 11,0
0,04 to 22,0 to 12,0 to
X6CrNi23-13 ≤ 0,70 2,00 0,035 0,015 ≤ 0,10 — — — — —
0,08 24,0 15,0
0,04 to 24,0 to 19,0 to
X6CrNi25-20 ≤ 0,70 2,00 0,035 0,015 ≤ 0,10 — — — — —
0,08 26,0 22,0

Elements not listed in this table may not be intentionally added to the steel without the agreement of the purchaser, except for finishing of the cast. All appropriate precautions are to be taken to

avoid the addition of such elements from scrap and other materials used in production, which would impair mechanical properties and the suitability of the steel.

Information concerning ISO steel numbers and designations according to other regional or national standards is given in Annex A.

Patented steel.
---------------------- Page: 14 ----------------------
ISO 9328-7:2018(E)
10 © ISO 2018 – All rights reserved
Table 3 (continued)
mass fraction, %
Steel grade C Si Mn P S N Cr Cu Mo Nb Ni Ti Others
max. max. max.
0,20 to
0,50 Al
Al + Ti:
0,03 to 19,0 to 30,0 to ≤ 0,70

X5NiCrAlTi31-20 (+RA) ≤ 0,70 1,50 0,015 0,010 ≤ 0,03 ≤ 0,50 — ≤ 0,10 0,20 to 0,50

0,08 22,0 32,5 ≤ 0,50 Co
Ni + Co:
30,0
to 32,5
0,25 to
0,65 Al
0,05 to 19,0 to 30,0 to ≤ 0,50 Co
X8NiCrAlTi32-21 ≤ 0,70 1,50 0,015 0,010 ≤ 0,03 ≤ 0,50 — — 0,25 to 0,65
0,10 22,0 34,0 Ni + Co:
30,0 to
34,0
0,04 to 0,30 to 15,0 to 10 × C to 12,0 to
X8CrNiNb16-13 1,50 0,035 0,015 — — — — —
0,10 0,60 17,0 1,20 14,0

Elements not listed in this table may not be intentionally added to the steel without the agreement of the purchaser, except for finishing of the cast. All appropriate precautions are to be taken to

avoid the addition of such elements from scrap and other materials used in production, which would impair mechanical properties and the suitability of the steel.

Information concerning ISO steel numbers and designations according to other regional or national standards is given in Annex A.

Patented steel.
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