ISO 945-1:2019 鋳鉄の微細構造—パート1：視覚分析によるグラファイト分類 | ページ 2

Foreword

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

This third edition cancels and replaces the second edition (ISO 945-1:2017), of which it constitutes a minor revision. The changes compared with the previous edition are as follows:

• Figures 3 and 4 have been corrected to a diameter of 120 mm to allow a direct comparison with the microscope display screen;
• Figures 3 and 4 have been corrected so that the maximum graphite sizes conform with Table 1.

A list of all parts in the ISO 945 series can be found on the ISO website.

Introduction

Microstructure designation is a useful feature that provides a means of classifying the graphite form, distribution and size in cast irons.

Graphite classification by visual analysis is a well-established method which is well recognized within the foundry industry as a means of quickly determining the overall graphite microstructure of a cast iron casting.

1 Scope

This document specifies a method of classifying the microstructure of graphite in cast irons by comparative visual analysis.

The purpose of this document is to provide information about the method of graphite classification. It is not intended to give information on the suitability of cast-iron types and grades for any particular application.

The particular material grades are specified mainly by mechanical properties and, in the case of austenitic and abrasion resistant cast irons, by their chemical composition. The interpretation of graphite form and size does not allow a statistically valid statement on the fulfilment of the requirements specified in the relevant material standard.

2 Normative references

There are no normative references in this document.

3 Terms and definitions

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography