ISO 1083:2018
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.
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Foreword
Introduction
1 Scope
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
7.2.1 Test pieces machined from cast samples
7.2.2 Test pieces machined from samples cut from a casting
7.2.3 Classification by hardness
7.2.4 Graphite structure
7.2.5 Matrix structure
7.3 Solid solution strengthened ferritic spheroidal graphite cast irons
7.3.1 Test pieces machined from cast samples
7.3.2 Test pieces machined from samples cut from a casting
7.3.3 Classification by hardness
7.3.4 Graphite structure
7.3.5 Matrix structure
8 Sampling
8.1 General
8.2 Cast samples
8.2.1 Size of cast samples
8.2.2 Frequency and number of tests
8.2.3 Separately cast samples
8.2.4 Side-by-side cast samples
8.2.5 Cast-on samples
8.2.6 Test pieces machined from cast samples
8.3 Samples cut from a casting
8.4 Formation of test units and number of tests
8.4.1 Examples of test units
8.4.2 Number of tests per test unit
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
Annex A (informative) Additional information on solid solution strengthened ferritic spheroidal graphite cast irons
Annex B (normative) Relationship between the elongation values obtained when using test pieces with Lo = 5 × d and Lo = 4 × d
Annex C (informative) Fracture mechanical approach to spheroidal graphite cast irons
Annex D (informative) Guidance values for mechanical properties measured on test pieces machined from samples cut from the castings
Annex E (informative) Classification as a function of hardness
Annex F (informative) Nodularity
Annex G (informative) Additional information on mechanical and physical properties
Annex H (informative) Sectioning procedure for cast samples
Annex I (informative) Cross-references of grade designations from this document to other standard grades of spheroidal graphite cast irons
Bibliography
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Foreword
Introduction
1 Scope
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
7.2.1 Test pieces machined from cast samples
7.2.2 Test pieces machined from samples cut from a casting
7.2.3 Classification by hardness
7.2.4 Graphite structure
7.2.5 Matrix structure
7.3 Solid solution strengthened ferritic spheroidal graphite cast irons
7.3.1 Test pieces machined from cast samples
7.3.2 Test pieces machined from samples cut from a casting
7.3.3 Classification by hardness
7.3.4 Graphite structure
7.3.5 Matrix structure
8 Sampling
8.1 General
8.2 Cast samples
8.2.1 Size of cast samples
8.2.2 Frequency and number of tests
8.2.3 Separately cast samples
8.2.4 Side-by-side cast samples
8.2.5 Cast-on samples
8.2.6 Test pieces machined from cast samples
8.3 Samples cut from a casting
8.4 Formation of test units and number of tests
8.4.1 Examples of test units
8.4.2 Number of tests per test unit
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
Annex A (informative) Additional information on solid solution strengthened ferritic spheroidal graphite cast irons
Annex B (normative) Relationship between the elongation values obtained when using test pieces with Lo = 5 × d and Lo = 4 × d
Annex C (informative) Fracture mechanical approach to spheroidal graphite cast irons
Annex D (informative) Guidance values for mechanical properties measured on test pieces machined from samples cut from the castings
Annex E (informative) Classification as a function of hardness
Annex F (informative) Nodularity
Annex G (informative) Additional information on mechanical and physical properties
Annex H (informative) Sectioning procedure for cast samples
Annex I (informative) Cross-references of grade designations from this document to other standard grades of spheroidal graphite cast irons
Bibliography