ISO 14737:2021

INTERNATIONAL ISO
STANDARD 14737
Third edition
2021-07
Carbon and low alloy cast steels for
general applications
Aciers moulés au carbone et faiblement alliés d'usage général
Reference number
©
ISO 2021
© ISO 2021
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ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General conditions for delivery . 1
5 Chemical composition . 1
6 Heat treatment . 1
7 Mechanical properties . 1
8 Test methods . 2
9 Supplementary requirements . 2
10 Marking . 2
Annex A (informative) Guidance data for welding . 7
Annex B (informative) UNS cast grades similar to ISO cast grades . 8
Bibliography . 9
Foreword
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iso/ foreword .html.
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 14737:2015), which has been technically
revised. The main changes compared to the previous edition are as follows:
— new Note was inserted in the Scope; previous Note 1 for Annex B was renumbered as Note 2;
— “Terms and Definitions” added as new Clause 3; subsequent Clauses were renumbered;
— footnote “a” to limit Cr, Mo, Ni, V, and Cu was added to GE200, GS200, GE240, and GS240 in Table 1.
This makes it consistent with EN 10293;
— correction of thickness, t, for G10MnMoV6-3 in Table 2;
— correction of tempering temperature range for G25NiCrMo2-2.
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 © ISO 2021 – All rights reserved

INTERNATIONAL STANDARD ISO 14737:2021(E)
Carbon and low alloy cast steels for general applications
1 Scope
This document specifies requirements for carbon and low alloy cast steel grades for general applications.
NOTE 1 Annex A provides guidance on welding.
NOTE 2 Annex B gives information on ISO grade designation and available UNS numbers which are similar to
the ISO grade designation.
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 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 4990, Steel castings — General technical delivery requirements
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 General conditions for delivery
Steel castings supplied in accordance with this document shall conform to the applicable requirements
of ISO 4990, including the supplementary requirements that are indicated in the inquiry and purchase
order.
5 Chemical composition
The chemical composition shall conform to the values given in Table 1.
6 Heat treatment
The type of heat treatment is left to the discretion of the manufacturer unless otherwise agreed upon at
the time of inquiry and order. Heat treatment described in Table 2 is for information only.
7 Mechanical properties
Mechanical properties are given in Table 2 and are subject to an agreement at the time of inquiry and
order.
Unless otherwise specified (see ISO 4990), the thickness of the test block shall be 28 mm minimum.
Properties at thicknesses greater than the maximum thickness in Table 2 may be lower and are subject
to an agreement between manufacturer and purchaser.
8 Test methods
8.1 The tensile test shall be performed in accordance with ISO 6892-1.
8.2 The impact test shall be performed in accordance with ISO 148-1.
9 Supplementary requirements
A list of supplementary requirements which may be used at the option of the purchaser is given in
ISO 4990.
10 Marking
Marking shall be as specified in ISO 4990.
2 © ISO 2021 – All rights reserved

Table 1 — Chemical composition, mass fraction in %
Grade desig
...