BS EN ISO 945-1:2008

BS EN ISO 945-1:2008 Microstructure of cast irons. Graphite classification by visual analysis

BS EN ISO 945-1 specifies a method of classifying the microstructure of graphite in cast irons by comparative visual analysis.

The purpose BS EN ISO 945-1 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 grade is specified by results from tensile tests or hardness testing and, in the case of austenitic 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. The structure of the metallic matrix (e.g. ferrite, pearlite) has a significant effect on the material properties. Such an interpretation is not the purpose of BS EN ISO 945-1.

Contents of BS EN ISO 945-1:

Foreword

Introduction

1 Scope

2 General

2.1 Designation system for classifying graphite in cast irons

2.2 Visual classification of graphite

3 Sampling and preparation of samples

3.1 Samples taken from a casting

3.2 Sample preparation

4 Procedure for graphite classification

4.1 Procedure for visual classification of graphite

4.2 Evaluation of the analysis results

5 Reference images

5.1 General

5.2 Reference images for graphite form

5.3 Reference images for the distribution of graphite (form I

5.4 Reference images for graphite size

6 Designation of graphite by form, distribution and size

6.1 Designation system

6.2 Designation of intermediate graphite sizes

6.3 Designation of mixed graphite forms, distributions and sizes

6.4 Nodule count

7 Report

Annex A (informative) Typical graphite forms in cast-iron materials (Examples of photomicrographs)

Annex B (informative) Distribution of flake (lamellar) graphite (form I) (Examples of photomicrographs)

Annex C (informative) Common terminology and main occurrences concerning graphite in cast irons

Bibliography