Comparative analysis of two linear defects at R-angle of hot rolled H-beam

FENG Yanqing; WU Juan; WANG Houxin; ZHAO Yichen

doi:10.12299/jsues.21-0159

Volume 35 Issue 1

Sep. 2022

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Article Navigation > Journal of Shanghai University of Engineering Science > 2022 > 36(1): 31-34

FENG Yanqing, WU Juan, WANG Houxin, ZHAO Yichen. Comparative analysis of two linear defects at R-angle of hot rolled H-beam[J]. Journal of Shanghai University of Engineering Science, 2022, 36(1): 31-34. doi: 10.12299/jsues.21-0159

Citation:

FENG Yanqing, WU Juan, WANG Houxin, ZHAO Yichen. Comparative analysis of two linear defects at R-angle of hot rolled H-beam[J]. Journal of Shanghai University of Engineering Science, 2022, 36(1): 31-34. doi: 10.12299/jsues.21-0159

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Comparative analysis of two linear defects at R-angle of hot rolled H-beam

doi: 10.12299/jsues.21-0159

1a.
Department of Materials Engineering
1b.
Department of Vehicle Engineering, Baotou Vocational Technical College, Baotou 014030, China
2.
CITIC Metals Co., Ltd., Beijing 100004, China
3.
Hebei Construction Steel Structure Industry Technology Research Institute, Tangshan 064001, China

Received Date: 2021-08-16
Publish Date: 2022-09-26

Abstract

Abstract

During the production of hot rolled H-beam, two linear cracks with the same position and similar morphology will appear at the R-angle connecting the web and flange, and close to the side of the web. In order to distinguish these two kinds of defects effectively, the macro and micro analysis of the two kinds of linear defect structures were carried out by means of on-site sampling, experimental analysis, production data statistics, metallographic observation and scanning electron microscope. The results show that both the causes and the production processes of the two linear cracks are all different. One is the hot crack generated from the billet, and the web crack at the R-angle is formed after the later heating and rolling. The other is the cold crack generated by the straightening process, and the straightening crack is formed at the R-angle of the finished product.
- hot rolled H-beam,
- linear crack,
- oxidation dot,
- web crack,
- straightening crack

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References(8)

References

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