ISO 16112:2017

INTERNATIONAL ISO
STANDARD 16112
Second edition
2017-02
Compacted (vermicular) graphite cast
irons — Classification
Fontes à graphite vermiculaire (compacté) — Classification
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 1
4 Designation . 2
5 Order information . 2
6 Manufacture . 2
7 Requirements . 3
7.1 General . 3
7.2 Test pieces machined from separately cast samples . 3
7.3 Test pieces machined from side-by-side and cast-on samples . 6
7.4 Test pieces machined from samples cut from a casting . 8
7.5 Hardness . 9
7.6 Graphite structure . 9
8 Sampling . 9
8.1 General . 9
8.2 Cast samples .10
8.2.1 Frequency and number of tests .10
8.2.2 Separately cast samples .10
8.2.3 Side-by-side cast samples .10
8.2.4 Cast-on samples .10
8.2.5 Test pieces machined from cast samples .11
8.3 Samples cut from a casting .11
8.3.1 General.11
8.3.2 Other conditions.11
8.4 Formation of test units and number of tests .11
8.4.1 Examples of test units .11
8.4.2 Number of tests per test unit .11
9 Test methods .12
9.1 Tensile test .12
9.2 Hardness test .13
10 Retests .14
10.1 Need for retests .14
10.2 Test validity .14
10.3 Nonconforming test results .14
10.4 Heat treatment of samples and castings .14
Annex A (informative) Additional information on compacted (vermicular) graphite cast irons .15
Annex B (informative) Compacted (vermicular) graphite cast iron nodularity evaluation .18
Annex C (informative) Compacted (vermicular) graphite cast irons — Properties
and typical applications .22
Annex D (informative) Cross-references of ISO 16112 grade designations to other standard
grades of compacted (vermicular) graphite cast iron .23
Bibliography .24
Foreword
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Technical Barriers to Trade (TBT) see the following URL: www . i so .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 25, Cast irons and pig irons.
This second edition cancels and replaces the first edition (ISO 16112:2006), which has been technically
revised with the following changes:
— Brinell hardness values have been moved from Table 1 and Table 2 to Table A.1;
— property values for cast-on samples with relevant wall thickness t ≤ 12,5 mm have been removed
from Table 2 because all data entries for t ≤ 12,5 mm were the same as the values for relevant wall
thickness 12,5 mm < t ≤ 30 mm;
— Annex B has been expanded to provide a more comprehensive explanation of the nodularity
evaluation technique;
— Annex C has been deleted and replaced because the series production experience gained since the
first publication of ISO 16112 in 2006 has surpassed the scope of the annex.
iv © ISO 2017 – All rights reserved

Introduction
This document deals with the classification of compacted (vermicular) graphite cast irons (CGI) in
accordance with the mechanical properties of the material.
The properties of compacted (vermicular) graphite cast irons depend on their graphite and matrix
microstructure.
The mechanical properties of the material can be evaluated on machined test pieces prepared from
— separately cast samples,
— samples cast in the mould alongside the casting, with a joint running system, hereafter called side-
by-side samples, or
— samples cast onto either the casting or the running system, hereafter referred to as cast-on
samples, or
— samples cut from a casting (only when an agreement is made between the manufacturer and the
purchaser).
The material grade is defined by mechanical properties measured on machined test pieces prepared
from separately cast samples, cast-on samples, or samples cut from the casting by agreement between
the manufacturer and the purchaser.
Annex A provides typical properties for compacted (vermicular) graphite cast irons obtained in
separately cast test bars.
Annex B provides information on a procedure to determine the graphite nodularity of the
microstructure.
Annex C provides information on properties and examples for typical applications of compacted
(vermicular) graphite cast irons.
Annex D provides cross-references of ISO 16112 grade designations to other national and international
standard grades of compacted (vermicular) graphite cast iron.
References used in the preparation of this document are listed in the Bibliography.
INTERNATIONAL STANDARD ISO 16112:2017(E)
Compacted (vermicular) graphite cast irons —
Classification
1 Scope
This document specifies five grades of compacted (vermicular) graphite cast irons.
This document specifies five grades based on the minimum mechanical properties measured on
machined test pieces prepared from
— separately cast samples,
— side-by-side cast samples,
— cast-on samples, or
— samples cut from a casting.
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 945-1, Microstructure of cast irons — Part 1: Graphite classification by visual analysis
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO/TR 15931, Designation system for cast irons and pig irons
3  Terms and definitions
For the pur
...