National foreword

This British Standard is the UK implementation of ISO 1083:2018.

The UK participation in its preparation was entrusted to Technical Committee ISE/111, Steel Castings and Forgings.

A list of organizations represented on this committee can be obtained on request to its secretary.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2018.

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 25, Cast irons and pig irons.

This fourth edition cancels and replaces the third edition (ISO 1083:2004), which has been technically revised with the following changes:

solid-solution strengthened ferritic spheroidal graphite cast irons grades have been added;
side-by-side cast samples have been added;
several definitions have been added;
the relation between mechanical properties and wall thickness has been added;
figures for separately cast or side-by-side cast samples have been updated;
the tensile test piece figure has been updated and the Charpy V-notched impact test piece figure has been removed;
Annex A has been partially reworded;
Annex C has been entirely reworded;
Annex D has been developed;
Annex E has become informative;
Annex G has been developed;
Annex H has been added.

Introduction

The properties of spheroidal graphite cast irons depend on their structure.

Spheroidal graphite cast irons covered by this document are divided into two groups:

ferritic to pearlitic spheroidal graphite cast irons;
solid-solution strengthened ferritic spheroidal graphite cast irons.

The mechanical properties of the material can be evaluated on machined test pieces prepared from the following:

separately cast samples;
side-by-side cast samples;
cast-on samples;
samples cut from a casting.

The material grade is defined by mechanical properties measured on machined test pieces prepared from cast samples.

If hardness is a requirement of the purchaser as being important for the application, then Annex E provides means for its determination.

It is well known that tensile properties and hardness of spheroidal graphite cast irons are interrelated. When considered by the purchaser as being important for the application, both tensile and hardness properties may be specified.

Some material grades can be suitable for pressure applications.

Further technical data on spheroidal graphite cast irons is given in Annexes C and G.

1 Scope

This document defines the grades and the corresponding requirements for spheroidal graphite cast irons.

This document specifies two groups of spheroidal graphite cast iron grades by a classification based on mechanical properties measured on machined test pieces prepared from cast samples. The first group deals mainly with ferritic to pearlitic grades. The second group deals with solid-solution strengthened ferritic grades.

This document also gives an informative classification as a function of hardness.

This document does not apply to the following:

spheroidal graphite cast irons used for pipes, fittings and accessories which are specified in accordance with ISO 2531 and ISO 7186;
highly alloyed (austenitic) spheroidal cast irons which are specified in accordance with ISO 2892;
ausferritic cast irons which are specified in accordance with ISO 17804.

2 Normative references

3 Terms and definitions

4 Designation

5 Order information

6 Manufacture

7 Requirements

7.1 General

7.2 Ferritic to pearlitic spheroidal graphite cast irons

7.3 Solid solution strengthened ferritic spheroidal graphite cast irons

8 Sampling

8.1 General

8.2 Cast samples

8.3 Samples cut from a casting

8.4 Formation of test units and number of tests

9 Test methods

9.1 Tensile test

9.2 Impact test

9.3 Hardness test

9.4 Graphite structure examination

10 Retests

10.1 Need for retests

10.2 Test validity

10.3 Non-conforming test results

10.4 Heat treatment of samples and castings

Bibliography

BS ISO 1083:2018

Spheroidal graphite cast irons. Classification

Current

Published:

31 May 2018