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GB/T 7216-2023 English PDF (GBT7216-2023)

GB/T 7216-2023 English PDF (GBT7216-2023)

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GB/T 7216-2023: Metallographic test for grey cast iron
This document specifies the preparation of specimens, inspection items and rating charts, result representation, test reports for metallographic examination of gray cast iron. This document is applicable to the evaluation of the microstructure of gray cast iron.
GB/T 7216-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.080.10
CCS J 31
Replacing GB/T 7216-2009
Metallographic test for grey cast iron
(ISO 945-1:2019, Microstructure of cast irons - Part 1: Graphite classification by visual analysis, MOD)
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: MAY 23, 2023
Issued by: State Administration for Market Regulation.
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Specimen preparation ... 6
5 Inspection items and rating chart ... 7
6 Result representation ... 22
7 Test report ... 23
Appendix A (Informative) Comparison of clause number between this document and ISO 945-1:2019 ... 24
Appendix B (Informative) Technical differences between this document and ISO 945- 1:2019 and their reasons ... 25
Appendix C (Informative) Example of typical flake graphite distribution morphology ... 27
Appendix D (Informative) Graphite type identification by image analysis ... 29 Appendix E (Informative) Phosphorus eutectic type ... 30
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".
This document replaces GB/T 7216-2009 "Metallographic test for gray cast iron". Compared with GB/T 7216-2009, in addition to structural adjustments and editorial changes, the main technical changes are as follows:
a) CHANGE the scope of application of the standard (see Chapter 1; Chapter 1 of the 2009 edition);
b) ADD the terms and definitions (see Chapter 3);
c) CHANGE the graphite distribution chart (see Figure 1; Figure 1 ~ Figure 6 of the 2009 edition);
d) CHANGE the graphite length measurement method (see 5.2.2; 4.2.1 of the 2009 edition);
e) CHANGE the graphite length grade reference chart (see Figure 2; Figure 7 ~ Figure 14 of the 2009 edition);
f) ADD the calculation method of graphite content (see 5.3);
g) CHANGE the pearlite content chart (see Figure 3; Figure 15 ~ Figure 22 of the 2009 edition);
h) CHANGE the carbide content chart (see Figure 4; Figure 23 ~ Figure 28 of the 2009 edition);
i) CHANGE the phosphorus eutectic content chart (see Figure 5; Figure 29 ~ Figure 34 of the 2009 edition);
j) CHANGE the magnification for detecting the number of eutectic clusters (see 5.7.1; 4.6.1 of the 2009 edition);
k) CHANGE the diameter of the 50x magnification photo of the eutectic cluster (see Table 6; Table 6 of the 2009 edition);
l) CHANGE the eutectic cluster number chart (see Figure 6 ~ Figure 13; Figure 35 ~ Figure 42 of the 2009 edition);
m) CHANGE the expression method of graphite shape and length (see 6.1 and 6.2; 5.1 and 5.2 of the 2009 edition);
Metallographic test for grey cast iron
1 Scope
This document specifies the preparation of specimens, inspection items and rating charts, result representation, test reports for metallographic examination of gray cast iron.
This document is applicable to the evaluation of the microstructure of gray cast iron. 2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for dated reference documents, only the version corresponding to the date applies to this document; for undated reference documents, the latest version (including all amendments) applies to this document.
GB/T 5611 Foundry terminology
GB/T 13298 Inspection methods of microstructure for metals
3 Terms and definitions
The terms and definitions defined in GB/T 5611, as well as the following terms and definitions, apply to this document.
3.1
Graphite length
The maximum straight-line distance between any two points on the graphite sheet outline.
4 Specimen preparation
4.1 Metallographic specimens shall be taken from the test block or casting; the detection surface shall avoid the casting surface.
4.2 Metallographic specimens are prepared in accordance with the provisions of GB/T 13298. During the process of intercepting and preparing metallographic specimens,
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