GB/T 10561-2023Determination of content of nonmetallic inclusions in steel - Micrographic method using standard diagrams (English PDF)

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 10561-2005 "Determination of content of nonmetallic

inclusions in steel - Micrographic method using standard diagrams". Compared with

GB/T 10561-2005, in addition to structural adjustments and editorial changes, the main

technical changes are as follows.

a) ADD the terms and definitions (see Chapter 3);

b) CHANGE the description of characteristics of category C (silicate) and category

DS inclusions (see 4.1; Chapter 2 of the 2005 edition);

c) ADD the total length (or quantity or diameter) of various inclusions of grade 3.5,

grade 4.0, grade 4.5, grade 5.0 (see Table 1);

d) CHANGE the minimum width of category D inclusions (see Table 2; Table 2 of

the 2005 version);

e) CHANGE the sampling method and schematic diagram of steel pipes [see Figure

2g, Figure 2h); Appendix NA of the 2005 edition];

f) ADD the Method B observation sample scanning diagram (see 7.2.1.2);

g) CHANGE the general principles of Method A and Method B (see 7.2.2; 5.2.3 of

the 2005 edition);

h) ADD the evaluation conditions for precipitated phases (see 7.2.2.8; Chapter 2 of

the 2005 edition);

i) CHANGE the method of expressing results (see Chapter 8; Chapter 6 of the 2005

edition);

j) CHANGE the measurement values of inclusions, the calculation formulas for

grades, the relationship diagram between rating picture grades and measured

inclusion values (see Appendix B; Appendix D of the 2005 version);

k) CHANGE the standard pictures of some grades, adding the scales (see Appendix

C; Appendix A of the 2005 edition);

l) ADD the examples of inclusion assessment (see Appendix D);

m) ADD the calculation formula for the average grade imoy of method B, as well as

the weighting factors of grade 3.5, grade 4.0, grade 4.5, grade 5.0 (see E.2 and

E.3).

This document modifies and adopts ISO 4967.2013 "Steel - Determination of content

of nonmetallic inclusion - Micrographic method using standard diagrams".

Compared with ISO 4967.2013, this document has made the following structural

adjustments.

- ADD the Chapter 2 and Chapter 3;

- The Chapter 4 corresponds to Chapter 2 in ISO 4967.2013; subsequent chapter

numbers are postponed;

- Appendix B corresponds to Appendix D in ISO 4967.2013;

- Appendix C corresponds to Appendix A in ISO 4967.2013;

- Appendix D corresponds to Appendix B in ISO 4967.2013;

- Appendix E corresponds to Appendix C in ISO 4967.2013.

Compared with ISO 4967.2013, this document has many technical differences. The

involved clauses are marked with a single vertical line (|) in the outer margin. A list of

these technical differences and their reasons is as shown in Appendix A.

Change the English translation of ISO standard names.

Please note that some content in this document may be subject to patents. The publisher

of this document assumes no responsibility for identifying patents.

This document was proposed by the China Iron and Steel Industry Association.

This document shall be under the jurisdiction of the National Steel Standardization

Technical Committee (SAC/TC 183).

Drafting organizations of this document. Baowu Special Metallurgy Co., Ltd.,

Metallurgical Industry Information Standards Institute, Institute of Metal Research,

Chinese Academy of Sciences, Shougang Group Co., Ltd., Iron and Steel Research

Institute Co., Ltd., Oupotong Technology Industry Co., Ltd., Jiangsu Yonggang Group

Co., Ltd., Jiangyin Xingcheng Special Steel Co., Ltd., Chengde Jianlong Special Steel

Co., Ltd., Delong Steel Co., Ltd., Fushun Special Steel Co., Ltd., Lvliang Jianlong

Industrial Co., Ltd., Xining Special Steel Co., Ltd.

1 Scope

This document gives information on the principles, sampling, specimen preparation,

determination, result expression, test reports for the evaluation of non-metallic

inclusions in steel, using standard rating charts; provides an image analysis method for

the determination of non-metallic inclusions (see appendix B).

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 13298 Inspection methods of microstructure for metals

GB/T 30067 Standard terminology relating to metallography

3 Terms and definitions

The terms and definitions, which are defined in GB/T 30067, as well as the following

terms and definitions, apply to this document.

The ratio -- of length to width of an individual particle.

The maximum size of spherical particles.

4 Principles

5 Sampling

6 Specimen preparation

7 Determination methods

8 Result representation

9 Test report

The test report shall include (but not be limited to) the following items.

......