ISO 11973:2023

INTERNATIONAL ISO
STANDARD 11973
Third edition
2023-11
Heat-resistant cast steels and alloys
for general applications
Aciers et alliages moulés réfractaires destinés à des applications
générales
Reference number
© ISO 2023
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General conditions of delivery .1
5 Heat treatment .1
6 Chemical composition .1
7 Mechanical properties .1
8 Maximum use temperature . 2
9 Supplementary requirements . 2
Annex A (informative) UNS cast grades similar to ISO cast grades . 5
Bibliography . 6
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 11, Steel
castings.
This third edition cancels and replaces the second edition (ISO 11973:2015), 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;
— Clause 4 has been updated to add a reference to Annex A;
— the title for Table 1 has been changed;
— supplementary requirements (see Clause 9) has been updated.
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 11973:2023(E)
Heat-resistant cast steels and alloys for general
applications
1 Scope
This document specifies chemical composition and mechanical properties of cast steels and alloys for
heat-resistant service.
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 4990, Steel castings — General technical delivery requirements
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 of delivery
Materials furnished in conformity with this document shall conform to the applicable requirements of
ISO 4990 including the supplementary requirements that are indicated on the enquiry and purchase
order. Similar UNS numbers to the grades in this document are included in Ann
...