HC340LA钢冲压“桔皮”缺陷成因及措施

doi:10.13228/j.boyuan.issn1006-9356.20190430

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Abstract The microstructure and mechanical properties of the 340 MPa-grade cold-rolled high strength low alloy (HSLA) steels with and without orange peel defects were analyzed. The results show that the yield point elongation of the stress-strain curve of the defective steel plate reaches 3.73%. The yield extension is too large, which leads to the orange peel defect on the surface of the stamped front windshield beam connecting plate. In the laboratory, the technique of the pre-stretching of the steel sheets is used to simulate the skin pass and stretching straight process for the industrial production of the steel sheets. With the increasing the pre-deformation amount, the length of the yield platform of the sample decreases, and when the pre-tension amount exceeds 1.8%, the yielding platform of the sample disappears. Further analysis of the microstructure reveals that the high annealing temperature leads to the coarse grain size and the abnormal grain orientation, which is the root cause of the "orange peel" defect of the stamped steel plate. In the annealing process, the reasonable control of leveling and tension straightening can eliminate or shorten the length of the yield platform of the test steel and avoid the occurrence of orange peel defects on the stamping parts.

Key words： high strength low alloy steel surface defect yield platform microstructure property

Received: 16 September 2019

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	Articles by authors
	WANG Li-hui
	LI Jian-xin
	SUN Li
	AN Hui-long
	MA Cheng
	DONG Yi-kang

Cite this article:

WANG Li-hui,LI Jian-xin,SUN Li等. Causes and improvement measures of stamping orange peel defects of HC340LA steels[J]. China Metallurgy, 2020, 30(3): 64-68.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20190430 OR http://www.zgyj.ac.cn/EN/Y2020/V30/I3/64

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