70t Consteel EAF-LF-CC生产耐热螺杆用钢B7的工艺实践  

Technology Practice of Production of Steel B7 for Heat-Resisting Standardized Piece

作　　者：王建明[1] 

机构地区：[1]湖北鄂钢股份有限公司技术部,鄂州436002

出　　处：《特殊钢》2005年第4期58-59,共2页Special Steel

摘　　要：鄂钢股份有限公司采用70tConsteel超高功率电弧炉70t钢包精炼炉4流150mm×150mm方坯连铸连轧工艺生产耐热螺杆高强度标准件用钢B7(40CrMnMo)。电弧炉炉料为30%生铁+70%优质废钢,废钢预热温度≥600℃。生产结果表明,该钢成品化学成分可稳定控制(%):0.39～0.42C,0.86～0.91Mn,0.22～0.31Si,0.013～0.018P,0.005～0.013S,0.85～0.94Cr,0.16～0.18Mo,0.019～0.028Als,偏析与疏松级别为0.5～1.0,夹杂物0.5～2.0级,Φ18～Φ50mm钢材晶粒度8.5～9级,满足耐热螺杆标准件的使用要求。The steel B7 (40CrMnMo) for high strength heat-resisting bolts is produced by 70 t Consteel UHP arc furnace - 70 t ladle refining furnace - 4 strand 150 mm×150 mm concasting - continuous rolling process at Egang. The charge of arc furnace is 30% pig iron + 70% quality scrap, of which the preheating temperature is no less than 600 ℃. The examination shows that the chemical compositions of products are controlled in range of 0.39～0.42C, 0.86～0.91Mn, 0.22～0.31Si, 0.013～0.018P, 0.005～0.013S, 0.85～0.94Cr, 0.16～0.18Mo, 0.019～0.028Als, the ratings of segregation and porosity are 0.5～1.0, the ratings of inclusion are 0.5～2.0 and the grain size of Φ18～Φ50 mm products are 8.5～9 which satisfy the using requirement of heat-resisting standardized piece bolts.

关 键 词：EAF-LF-CC 工艺实践 耐热 螺杆 超高功率电弧炉 股份有限公司 标准件用钢 钢包精炼炉 工艺生产 方坯连铸 预热温度 稳定控制 化学成分 600 夹杂物 晶粒度 废钢 鄂钢 连轧 生铁 炉料 偏析 

分 类 号：TF764.2[冶金工程—钢铁冶金]