ISO 11972:2023

INTERNATIONAL ISO
STANDARD 11972
Third edition
2023-11
Corrosion-resistant cast steels for
general applications
Aciers moulés résistant à la corrosion pour applications courantes
Reference number
© ISO 2023
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative reference .1
3 Terms and definitions . 1
4 General conditions for delivery . 1
5 Chemical composition .1
6 Mechanical properties .1
7 Heat treatment .1
8 Supplementary requirements . 5
Annex A (informative) UNS cast grades similar to ISO cast grades . 6
Bibliography . 7
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC11, Steel
castings.
This third edition cancels and replaces the second edition (ISO 11972:2015), which has been technically
revised.
The main changes are as follows:
— the mandatory Terms and definitions clause (see Clause 3) has been added and subsequent clauses
have been renumbered;
— the title for Table 1 has been changed;
— supplementary requirements (see Clause 8) has been updated;
— the document has been editorially revised to conform to the most recent version of the ISO/
IEC Directives, Part 2.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
INTERNATIONAL STANDARD ISO 11972:2023(E)
Corrosion-resistant cast steels for general applications
1 Scope
This document specifies cast steels for general corrosion-resistant applications. The grades covered by
this document represent types of alloy steel castings suitable for broad ranges of application which are
intended for a wide variety of corrosion applications.
NOTE Annex A gives information on ISO grade designation and available UNS numbers which are similar to
the ISO grade designation.
2 Normative reference
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 4990, Steel castings — General technical delivery conditions
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 General conditions for delivery
Materials furnished according to this document shall conform to the applicable requirements of
ISO 4990 including the supplementary requirements that are indicated on the inquiry and purchase
order.
5 Chemical composition
The steel shall conform to the requirements for chemical composition specified in Table 1.
6 Mechanical properties
Steel used for castings shall conform to the mechanical property requirements given in Table 2 up to
the maximum ruling thickness. Verification of impact tests is not required except when indicated by
the customer. Test blocks used to verify mechanical properties shall not have a thickness exceeding
150 mm. For samples removed from castings, the mechanical properties required shall be agreed
between the manufacturer and purchaser.
7 Heat treatment
Castings shall be heat-treated in accordance with the requirements in Table 3.
Table 1 — Chemical composition, mass fraction in %
Grade designation Chemical composition
Name Number C Si Mn P S Cr Mo Ni Others
GX12Cr12 1.4011 0,15 1,0 1,0 0,035 0,025 11,5 to 13,5 0,50 1,0
GX7CrNiMo12–1 1.4008 0,10 1,0 1,0 0,035 0,025 12,0 to 13,5 0,20 to 0,50 1,0 to 2,0
GX4CrNi13–4 (QT1)
1.4317 0,06 1,0 1,0 0,035 0,025 12,0 to 13,5 0,70 3,5 to 5,0
GX4CrNi13–4 (QT2)
GX4CrNiMo16–5-1 1.4405 0,06 0,8 1,0 0,035 0,025 15,0 to 17,0 0,70 to 1,50 4,0 to 6,0
GX2CrNi19–11 1.4309 0,03 1,5 2,0 0,035 0,025 18,0 to 20,0 – 9,0 to 12,0 N: 0,20
GX2CrNiN19–11 1.4487 0,03 1,5 1,5 0,040 0,030 18,0 to 20,0 – 9,0 to 12,0 N: 0,12 to 0,20
GX5CrNi19–10 1.4308 0,07 1,5 1,5 0,040 0,030 18,0 to 20,0 – 8,0 to 11,0
GX5CrNiNb19–11 1.4552 0,07 1,5 1,5 0
...