ISO 14737:2015

INTERNATIONAL ISO
STANDARD 14737
Second edition
2015-12-15
Carbon and low alloy cast steels for
general applications
Aciers moulés au carbone et faiblement alliés d’usage général
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 references . 1
3 General conditions for delivery . 1
4 Chemical composition . 1
5 Heat treatment . 1
6 Mechanical properties . 1
7 Test methods . 1
8 Supplementary requirements . 2
9 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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The committee responsible for this document is The committee responsible for this document is
ISO/TC 17, Steel, Subcommittee SC 11, Steel castings.
This second edition cancels and replaces the first edition (ISO 14737:2003) and ISO 3755, of which it
constitutes a technical revision. Notably, the following changes have been made to the previous edition:
— carbon has replaced non-alloy in the title of the standard;
— grades G21Mn5 and G50CrMo4 have been deleted;
— Annexes A and B have been replaced;
— new values and grade numbers have been added to Tables 1 and 2 and Annex A.
iv © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 14737:2015(E)
Carbon and low alloy cast steels for general applications
1 Scope
This International Standard specifies requirements for carbon and low alloy cast steel grades for
general applications.
NOTE 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, 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 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 General conditions for delivery
Steel castings supplied in accordance with this International Standard shall conform to the applicable
requirements of ISO 4990, including the supplementary requirements that are indicated in the inquiry
and purchase order.
4 Chemical composition
The chemical composition shall conform to the values given in Table 1.
5 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. The information for heat treatment described in Table 2 is for
information only.
6 Mechanical properties
Mechanical properties are given in Table 2 and shall be 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.
7 Test methods
7.1 The tensile test shall be performed in accordance with ISO 6892-1.
7.2 The impact test shall be performed in accordance with ISO 148-1.
8 Supplementary requirements
A list of supplementary requirements which may be used at the option of the purchaser is given in
ISO 4990.
9 Marking
Marking shall be as specified in ISO 4990.
2 © ISO 2015 – All rights reserved

Table 1 — Chemical composition, % (m/m)
Grade designation
C Si Mn P S Cr Mo Ni V Cu
Name Number
GE 200 1.0420 — — — 0,035 0,030 0,30 0,12 0,40 0,03 0,30
GS 200 1.0449 0,18 0,60 1,20 0,030 0,025 0,30 0,12 0,40 0,03 0,30
GE 240 1.0446 — — — 0,035 0,030 0,30 0,12 0,40 0,03 0,30
GS 240 1.0455 0,23 0,60 1,20 0,030 0,025 0,30 0,12 0,40 0,03 0,30
a a a a a
GS 270 1.0454 0,24 0,60 1,30 0,030 0,025 0,30 0,12 0,40 0,03 0,30
a a a a a
GS 340 1.0467 0,30 0,60 1,50 0,030 0,025 0,30 0,12 0,40 0,03 0,30
G28Mn6 1.1165 0,25 to 0,32 0,60 1,20 to 1,80 0,035 0,030 0,30 0,15 0,40 0,05 0,30
G28MnMo6 1.5433 0,25 to 0,32 0,60 1,20
...