316L不锈钢冷轧板表面缺陷分析和工艺改进
发布时间：2018-07-16 19:15
【摘要】：316L不锈钢0.3~4.0 mm冷轧板的冶金生产流程为180 t EAF-AOD-LF-200 mm连铸板坯-热轧2.5~14.0 mm板-冷轧。通过对连铸坯、热轧卷以及冷轧板的化学成分、金相和扫描电镜及能谱检测,并对316L不锈钢冷轧板表面出现的线状缺陷进行了分析。结果表明,连铸坯表面振痕较深,有凹坑,并且存在深度≤300μm微裂纹缺陷;热轧板表面存在线状缺陷,缺陷附近存在大面积的氧化区域;冷轧板缺陷处(S含量0.001%,Cr_(当量)/Ni_(当量)=1.58)未发现较大尺寸的夹杂物。得出冷轧板线状缺陷源来自连铸坯,在加热炉中被严重氧化,最终形成冷轧板表面线状缺陷。通过将铸坯拉速从1.1 m/min降至1.0m/min,钢水过热度从45℃降至40℃,二冷比水量从1.0 kg/t降至0.9 kg/t,铸坯修磨用砂轮由16~#改为20~#等工艺措施,冷轧板表面缺陷大幅减少。
[Abstract]:The metallurgical process of 316L stainless steel 0.3N 4.0 mm cold rolled sheet is 180 t EAF-AOD-LF-200 mm continuous casting slab, hot rolling 2.5 ~ 14.0 mm plate and cold rolling. The chemical composition, metallography, scanning electron microscope and energy dispersive spectrum of continuous casting billet, hot rolled coil and cold rolled sheet were examined, and the linear defects on the surface of 316L cold rolled stainless steel sheet were analyzed. The results show that the surface of continuous casting billet has deep vibration marks, pits and microcracks with depth 鈮，
本文编号：2127407
[Abstract]:The metallurgical process of 316L stainless steel 0.3N 4.0 mm cold rolled sheet is 180 t EAF-AOD-LF-200 mm continuous casting slab, hot rolling 2.5 ~ 14.0 mm plate and cold rolling. The chemical composition, metallography, scanning electron microscope and energy dispersive spectrum of continuous casting billet, hot rolled coil and cold rolled sheet were examined, and the linear defects on the surface of 316L cold rolled stainless steel sheet were analyzed. The results show that the surface of continuous casting billet has deep vibration marks, pits and microcracks with depth 鈮，
本文编号：2127407
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