ISO 1083:2018
(Main)Spheroidal graphite cast irons — Classification
Spheroidal graphite cast irons — Classification
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.
Fontes à graphite sphéroïdal — Classification
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 1083
Fourth edition
2018-04
Spheroidal graphite cast irons —
Classification
Fontes à graphite sphéroïdal — Classification
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Designation . 2
5 Order information . 3
6 Manufacture . 3
7 Requirements . 3
7.1 General . 3
7.2 Ferritic to pearlitic spheroidal graphite cast irons . 3
7.2.1 Test pieces machined from cast samples . 3
7.2.2 Test pieces machined from samples cut from a casting . 5
7.2.3 Classification by hardness . 6
7.2.4 Graphite structure . 6
7.2.5 Matrix structure. 6
7.3 Solid solution strengthened ferritic spheroidal graphite cast irons . 6
7.3.1 Test pieces machined from cast samples . 6
7.3.2 Test pieces machined from samples cut from a casting . 6
7.3.3 Classification by hardness . 7
7.3.4 Graphite structure . 7
7.3.5 Matrix structure. 7
8 Sampling . 7
8.1 General . 7
8.2 Cast samples . 8
8.2.1 Size of cast samples . 8
8.2.2 Frequency and number of tests . 8
8.2.3 Separately cast samples . 8
8.2.4 Side-by-side cast samples . 9
8.2.5 Cast-on samples . 9
8.2.6 Test pieces machined from cast samples . 9
8.3 Samples cut from a casting .14
8.4 Formation of test units and number of tests .14
8.4.1 Examples of test units .14
8.4.2 Number of tests per test unit .14
9 Test methods .14
9.1 Tensile test .14
9.2 Impact test .15
9.3 Hardness test .15
9.4 Graphite structure examination .16
10 Retests .17
10.1 Need for retests .17
10.2 Test validity .17
10.3 Non-conforming test results .17
10.4 Heat treatment of samples and castings .17
Annex A (informative) Additional information on solid solution strengthened ferritic
spheroidal graphite cast irons .18
Annex B (normative) Relationship between the elongation values obtained when using test
pieces with L = 5 × d and L = 4 × d .21
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Annex C (informative) Fracture mechanical approach to spheroidal graphite cast irons .22
Annex D (informative) Guidance values for mechanical properties measured on test pieces
machined from samples cut from the castings .24
Annex E (informative) Classification as a function of hardness .26
Annex F (informative) Nodularity .29
Annex G (informative) Additional information on mechanical and physical properties .30
Annex H (informative) Sectioning procedure for cast samples .34
Annex I (informative) Cross-references of grade designations from this document to other
standard grades of spheroidal graphite cast irons .35
Bibliography .36
iv © ISO 2018 – All rights reserved
Foreword
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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.
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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:
a) ferritic to pearlitic spheroidal graphite cast irons;
b) solid-solu
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