包晶钢15CrMoG方坯表面缺陷分析与改进

doi:10.13228/j.boyuan.issn1005-4006.20220065

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Abstract Facing the quality problems of surface sag and longitudinal crack of steel leakage of 200 mm×200 mm continuous casting billet of peritectic steel 15CrMoG, the surface sag and breakout defects of casting billet are analyzed by surface inspection and test comparison. The result indicates that surface sag and longitudinal crack of steel leakage are caused by the uneven heat transfer between the crystallizer copper tube and the slag and the low intensity of secondary cooling. By changing the crystallizer copper tube taper from 0.72%/m to 1.10%/m and the basicity of slag from 0.72 to 1.05 and the viscosity from 0.44 Pa·s to 0.74 Pa·s and the melting temperature from 1 170 ℃ to 1 191 ℃ and the secondary cooling ratio water quantity from 0.30 L/kg to 0.45 L/kg,it improves the cooling heat transfer of the crystallizer and the cooling effect of the secondary cooling section and the cooling uniformity of casting billet. The result shows the defects of casting billet have been effective controlled.

Key words： peritectic steel surface sag longitudinal crack of steel leakage crystallizer copper tube slag secondary cooling

Received: 06 May 2022

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	Articles by authors
	LIN Peng
	ZHANG Hong-cai
	ZUO Hui
	XU Zheng-zhou
	ZHAI Wan-li

Cite this article:

LIN Peng,ZHANG Hong-cai,ZUO Hui等. Analysis and improvement of surface defects of peritectic steel 15CrMoG billet[J]. CONTINUOUS CASTING, 2023, 42(1): 61-65.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20220065 OR http://www.chinamet.cn/Jweb_lz/EN/Y2023/V42/I1/61

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