非调质钢S38MnSiV采用转炉-矩形坯连铸工艺的生产实践

本钢采用“铁水脱硫扒渣→150t转炉冶炼→（LF+RH）精炼→矩形坯连铸（350 mm×470 mm）→800 mm棒材连轧机组（轧材保温）→检验入库”生产工艺流程，生产的非调质钢S38MnSiV，钢材中氧含量不大于16×10-6、氢质量分数不大于1.2×10-6、氮质量分数在（136～162）×10-6范围内；φ160 mm圆钢的低倍、非金属夹杂物、晶粒度等级均符合标准要求；力学性能达到Rm≥865 MPa，ReL≥560 MPa，Aku≥66 J，满足标准要求。

Technology Practice of Non-Quenched-Tempered Steel S38MnSiV Produced by BOF-CC of Rectangular Bloom

The non-quenched-tempered S38MnSiV steel was produced by hot metal desulphurization→150t BOF→（LF＋RH）→CC of rectangular section（350 mm×470 mm）→800 mm mill（slow cooling of the steel）→test and storage route in BX Steel.The oxygen content of the steel is not more than 16×10^-6,the hydrogen content of the steel not more than 1.2×10^-6,and the nitrogen content of the steel between 136×10^-6 and 162×10^-6.The macrostructure,non-metallic inclusions and the grain size of the  160 mm steel accord with the standard.The mechanical properties answer for the standard with Rm≥865MPa,ReL≥560MPa,Aku≥64J.