亚包晶钢Q235D连铸大方坯的质量控制

特殊钢 ›› 2010, Vol. 31 ›› Issue (4): 34-36.

亚包晶钢Q235D连铸大方坯的质量控制

何庆文^1,2李阳¹, 王福明¹, 张家泉¹

1北京科技大学冶金与生态工程学院，北京100083;
2莱芜钢铁股份有限公司特殊钢厂，莱芜271104

收稿日期:2010-03-01 出版日期:2010-08-01 发布日期:2022-11-20
作者简介:何庆文(1968-),男，博士研究生，高级工程师，电弧炉炼钢、连铸工艺技术研究及产品质量控制。

Quality Control for Casting Bloom of Hypo-Peritectic Steel Q235D

He Qingwen^1,2, Li Yang¹, Wang Fuming¹, Zhang Jiaquan¹

1 School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083;
2 Special Steel Works,Laiwu lron Steel Co Ltd,Laiwu 271105

Received:2010-03-01 Published:2010-08-01 Online:2022-11-20

摘要/Abstract

摘要： 莱钢特钢厂50 t UHP-EAF (热装铁水比≥50%) +LF(VD)冶炼的Q235D钢(0.10%～0.17%C)260mm×300 mm的连铸坯轧制成直径Φ150 mm圆钢后,钢材表面出现裂纹。分析表明,钢的包晶点的碳当量[C1]与钢中实际碳含量[C]之间的差别△C越大,亚包晶钢Q235D钢材废品率越高。实践表明,控制0.15%～0.17%[C]使△C<0.015%,钢液过热度20～30℃,结合降低结晶器冷却水流量和二冷区冷却强度,低拉速,使成品材表面质量合格率在99.3%以上。

关键词: 亚包晶钢Q235D, , 包晶点碳含量, 大方坯表面质量

Abstract: The cracks at surface of 150 mm round bar occur after rolled from 260 mm×300 mm continuous casting bloom of steel Q235D (0. 10%～0. 17%C) melted by 50 t UHP EAF (hot metal charging ratio more than 50%) + LF (VD)process at Special Steel Workesley Steel. Analysis indicated that the larger the △C-difference between carbon equivalent [C,] at peritectic point of steel and real carbon content in steel [C], the higher the crack rejection rate of hypo- peritectic steel Q235D products. Practice shows that with controlling.0. 15%～0. 17%[C] for △C<0.015%, overheating extent of liquid steel 20~30℃, combined with decreasing mold cooling water rate, decreasing cooling water intensity in secondary zone and with low casting speed, the qualified rate for surface quality of finished products is more than 99.3%.

何庆文, 李阳, 王福明, 张家泉. 亚包晶钢Q235D连铸大方坯的质量控制[J]. 特殊钢, 2010, 31(4): 34-36.

He Qingwen, Li Yang, Wang Fuming, Zhang Jiaquan. Quality Control for Casting Bloom of Hypo-Peritectic Steel Q235D[J]. Special Steel, 2010, 31(4): 34-36.