电炉冶炼C38MnNS5非调质钢的开发

Development of C38MnNS5non-quenched and tempered steel with electric arc furnace smelting

南京钢铁联合有限公司采用100t电炉→LF精炼炉→VD真空炉→320mm×480mm大方坯连铸工艺流程,制定了合理的内控成分,并强化电炉终点控制、LF造白渣脱氧、增氮增硫、夹杂物变性处理、低过热度全保护浇铸等关键生产工艺,开发生产了C38MnNS5直接车削加工用非调质钢,具有优异的强塑性配合,屈服强度在560MPa以上,抗拉强度大于860MPa,冲击功在70J以上,各项指标达到用户技术要求。

C38MnNS5non-quenched and tempered steel for direct cutting was produced by 100 telectric arc furnace smelting-LF+VD refining-320mm×480mm billet con-casting process at Nanjing Iron and Steel United Co.,Ltd.The rational inner controlling chemical composition has been formulated;the critical processes of the EAF end-point control,deoxidization via producing the white slag in LF,nitrogen and sulfur addition,modification of sulphide and casting with full protection at the low overheating temperature etc have been strengthened.The steel has excellent strength and toughness coordination with yield strength higher than 560 MPa,tensile strength higher than 860 MPa and impact energy higher than 70 J.The various properties of C38MnNS5 steel can meet all the technical requirements from the customers.