ISO 11972:2015

INTERNATIONAL ISO
STANDARD 11972
Second edition
2015-09-15
Corrosion-resistant cast steels for
general applications
Aciers moulés résistant à la corrosion pour applications courantes
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative reference . 1
3 General conditions for delivery . 1
4 Chemical composition . 1
5 Mechanical properties . 1
6 Heat treatment . 1
7 Supplementary requirements . 5
Annex A (informative) UNS cast grades similar to ISO cast grades . 6
Bibliography . 7
Foreword
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The committee responsible for this document is ISO/TC17, Steel, Subcommitee SC11, Steel castings.
This second edition cancels and replaces the first edition (ISO 11972:1998), which has been technically
revised with the following changes:
— Clause 7 revised;
— Table 1 composition limits modified — various grades;
— Tables 1, 2, and 3 — grade numbers added;
— Annex A added.
iv © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 11972:2015(E)
Corrosion-resistant cast steels for general applications
1 Scope
This International Standard specifies cast steels for general corrosion-resistant applications. The
grades covered by this International Standard 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, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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 General conditions for delivery
Materials furnished according to this International Standard shall conform to the applicable
requirements of ISO 4990 including the supplementary requirements that are indicated on the inquiry
and purchase order.
4 Chemical composition
The steel shall conform to the requirements for chemical composition specified in Table 1.
5 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.
6 Heat treatment
Castings shall be heat treated in accordance with the requirements in Table 3.
Table 1 — Chemical composition, % (m/m)
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 0,040 0,030 18,0 to 20,0 – 9,0 to 12,0 8 × C ≤ Nb ≤ 1,00
GX2CrNiMo19–11–2 1.4409 0,03 1,5 2,0 0,035 0,025 18,0 to 20,0 2,00 to 2,50 9,0 to 12,0 N 0,20
GX2CrNiMoN19–11–2 1.4490 0,03 1,5 2,0 0,035 0,030 18,0 to 20,0 2,00 to 2,50 9,0 to 12,0 N 0,12 to 0,20
GX4CrNiMoN26–5-2 1.4474 0,05 1,0 2,0 0,035 0,025 25,0 to 27,0 1,30 to 2,00 4,5 to 6,5 N 0,12 to 0,20
GX5CrNiMo19–11–2 1.4408 0,07 1,5 1,5 0,040 0,030 18,0 to 20,0 2,00 to 2,50 9,0 to 12,0
GX5CrNiMoNb19–11–2 1.4581 0,07 1,5 1,5 0,040 0,030 18,0 to 20,0 2,00 to 2,50 9,0 to 12,0 8 × C ≤ Nb ≤ 1,00
GX2CrNiMo19–11–3 1.4518 0,03 1,5 1,5 0,040 0,030 18,0
...