GB/T 33165-2016Quantitative Analysis Method of Centre Segregation for High Carbon Steel Wire Rod (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009.

This Standard was proposed by China Iron and Steel Industry Association.

This Standard shall be under the jurisdiction of National Technical Committee for

Standardization of Steel (SAC/TC 183).

Drafting organizations of this Standard. Wuhan Iron and Steel Co., Ltd., China

Metallurgical Information and Standardization Institute, and Tianjin Iron and Steel

(Group) Co., Ltd.

Chief drafting staffs of this Standard. Sun Yiqiang, Wu Lixin, Wang Zhifen, Chen

Shihua, Yan Chengming, Han Rongdong, Deng Zhaojun, Zhang Long, and Luo

Chunmin.

Quantitative Analysis Method of Centre

Segregation for High Carbon Steel Wire Rod

1 Scope

This Standard specifies the terms, principle, instrument and auxiliary equipment,

standard sample, specimen preparation, measuring conditions and methods, and

result analysis for quantitative analysis of center segregation for high carbon steel wire

rod by using spectrometer.

This Standard is applicable to the high carbons steel hot-rolled wire rod with carbon

content greater than 0.65%.

2 Normative References

The following documents are essential to the application of this document. For the

dated documents, only the versions with the dates indicated are applicable to this

document; for the undated documents, only the latest version (including all the

amendments) are applicable to this document.

GB/T 4930 Microbeam Analysis - Electron Probe Microanalysis - Guidelines for

the Specification of Certified Reference Materials (Crms)

GB/T 13298 Inspection Methods of Microstructure for Metals

GB/T 15074 General Guide of Quantitative Analysis by EPMA

GB/T 21636 Microbeam Analysis - Electron Probe Micro Analysis (EPMA) -

Vocabulary

GB/T 27025 General Requirements for the Competence of Testing and Calibration

Laboratories

GB/T 30067 Standard Terminology Relating to Metallography

3 Terms and Definitions

The following terms and definitions and those stipulated in GB/T 21636 and GB/T

30067 are applicable to this document.

5 Instrument and Auxiliary Equipment

The testing laboratory shall meet the requirements of GB/T 27025; and have the

following instrument and auxiliary equipment.

a) Electron probe analyzer or scanning electron microscope for installing

spectrometer accessories.

b) Metallographic specimen preparation device, including specimen embedding,

grinding, polishing and corrosion device.

c) Metallographic microscope.

d) Ultrasonic cleaning device.

6 Standard Sample

7 Specimen Preparation

Take the cross-section of wire rod as the specimen, then make the metallographic

polishing specimen as per GB/T 13298. After acid leaching the specimen into 2%~4%

nitric acid alcohol solution, use glass knife, scalpel or other sharp tools to make parallel

scratch mark on two sides of the segregation area, the scratch is approximately

tangent to the edge of segregation area (see Figure 1). Through polishing again, the

corrosion layer is completely removed from the specimen, while the scratch mark is

retained.

Appendix B

(Informative)

Factors Affecting the

Measuring Uncertainty of the

Element Content by Spectrometer

B.1 Sample contamination. including the water stains on the polishing surface, dust,

and other contaminants.

B.2 Sample electric charge accumulation. mainly caused by not grounding, poor

grounding of the sample; or too high current and voltage.

B.3 Measurement repeatability. including the fluctuation of measuring valued caused

by the fluctuation of accelerated voltage, beam, and detector.

B.4 Working curve. the linearity of working curve affects the measuring results.

B.5 Standard sample. the uncertainty and nonuniformity of element content in

standard sample affect the measuring results.

B.6 Rounding off on the measuring results. the rounding off on measuring value

affects the measuring results.

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