Q235B钢种中宽带边裂缺陷的原因分析与改进

doi:10.13228/j.boyuan.issn1005-4006.20230058

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Abstract By tracking the continuous casting billet, it is found that the distribution of the upper edge crack of the hot rolled strip is very consistent with the distribution of the transverse corner crack of the continuous casting billet.The results of energy spectrum analysis showed that K and Na were typical components of mold powder, which proved that the defect originated in the mold of continuous casting machine. Then take Q235B molten steel as an example, the carbon content should be controlled in the range of 0.15%-0.20%, w([Mn])/w([S])>20 standard. By avoiding the crack sensitive region of carbon content and w([Mn])/w([S]), the proportion of furnace times in the crack sensitive region of carbon content and w([Mn])/w([S]) and the value of the opening of the foot roll of continuous casting mold are adjusted to 0 mm、0.4 mm、0.8 mm.Two-side and middle-three-point tests were used to test the arc-foot roller and sector roller in the mould. Each checkpoint detects four sets of values, and the test control standard was (1±0.15) mm The edge crack rate of hot rolled steel strip was reduced from 0.46% to 0.04% by optimizing and improving the nozzle insertion depth of continuous casting mold to 120-150 mm.

Key words： hot rolled strip coil edge crack carbon content Mn/S ratio foot roll opening

Received: 27 June 2023

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	Articles by authors
	YE Gaoqi
	HAN Xiaoqiang
	LI Sheng
	MA Yunfei

Cite this article:

YE Gaoqi,HAN Xiaoqiang,LI Sheng等. Analysis and improvement of wide band edge crack defect in Q235B steel[J]. CONTINUOUS CASTING, 2024, 43(1): 73-77.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20230058 OR http://www.chinamet.cn/Jweb_lz/EN/Y2024/V43/I1/73

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