小方坯9SiCr铸坯渣沟成因分析及改进措施

doi:10.13228/j.boyuan.issn1005-4006.20200074

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Abstract During the production of 9SiCr of high-carbon alloy tool steel in Xuanhua Iron and Steel Co., Ltd, serious slag groove defects appear on the slab surface, which will lead to the problem of steel leakage in the slag groove. Based on the field investigation and data analysis, the characteristics of steel, composition of molten steel and performance of mold flux were studied, and it was found that the high quality fraction of hydrogen in steel, the mismatching performance of mold flux and the existing problems of continuous casting process matching were the main reasons leading to the occurrence of slag groove and steel leakage in slag groove. By controlling the hydrogen content of steel within the range of 0.000 17%-0.000 23%, optimizing the performance of mold flux by reducing the basicity of the mold flux from 0.83 to 0.71 and adding 0.8% Li₂O, and adjusting the technological parameters of continuous casting by controlling the casting temperature at 1 480-1 495 ℃, the nozzle insertion depth at 100-120 mm, and the mold cone angle at 1.2%-1.5%/m, the problems of slag runner defect and breakout problems of 9SiCr billet were solved completely

Key words： 9SiCr steel slag groove hydrogen content mold flux billet breakout

Received: 30 June 2020

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	Articles by authors
	CHEN Shou-jie
	LI Ji
	WANG Jian-wei
	ZHU Xian-shi
	LI Ju-dong
	GAO Jin-xing

Cite this article:

CHEN Shou-jie,LI Ji,WANG Jian-wei等. Cause analysis and improvement measures to surface slag-scratch of billet 9SiCr steel[J]. CONTINUOUS CASTING, 2020, 39(6): 34-37.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20200074 OR http://www.chinamet.cn/Jweb_lz/EN/Y2020/V39/I6/34

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