硬线钢拉拔断裂机理及连铸工艺优化

doi:10.13228/j.boyuan.issn0449-749x.20210047

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Abstract Hard wire steel requires not only good mechanical properties,but also good processing properties. However,wire breakage often occurs in the drawing process of the wire rod of hard wire steel,which brings great harm to the continuity of processing. In order to reduce the wire breakage during the drawing of hard wire steel,the drawing fracture mechanism was studied,and the optimization of the corresponding continuous casting process was carried out. The drawing fractured wire sample of 82B hard wire steel was analyzed firstly. Through the analysis on the fractograph and longitudinal section of the fracture specimen,combined with the internal quality inspection of corresponding continuous casting billet,the influence mechanism of central defects and segregation of billet on drawing fracture of hard wire steel was obtained,which promoted the formation of cementite film in the center of wire rod and led to the generation and propagation of cracks. Then,by applying final electromagnetic stirring (F-EMS) at the solidification end of continuous casting with current of 350 A and frequency of 6.0 Hz,and reducing the superheat of molten steel to below 30 ℃,the central shrinkage and central segregation of 82B hard wire steel billet were reduced to 0.5 and 1.08, respectively,and the wire breaking rate of 82B hard wire steel was significantly reduced from 10-15 times per 100 tons before optimization to 4-5 times per 100 tons.

Key words： hard wire steel drawing fracture shrinkage defect central segregation superheat of molten steel final electromagnetic stirring

Received: 25 January 2021

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	Articles by authors
	YANG Wen
	ZHANG Yan-hui
	ZHANG Li-feng
	JIANG Jin-dong
	WU Cong-ying

Cite this article:

YANG Wen,ZHANG Yan-hui,ZHANG Li-feng等. Mechanism of drawing fracture of hard wire steel and optimization of continuous casting process[J]. Iron and Steel, 2021, 56(9): 74-79.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210047 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I9/74

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