GCr15SiMn轴承钢?400mm铸坯工艺实践  

The Process Practice of ?400 mm Bloom of GCr15SiMn Bearing Steel

作　　者：王强 祖峰 张梁 蒋鹏飞 袁续阳 

机构地区：[1]天津天管特殊钢有限公司,天津300301

出　　处：《天津冶金》2014年第2期41-43,47,共4页Tianjin Metallurgy

摘　　要：天津天管特殊钢有限公司采用100 t EBT 电炉→100 t钢包炉→100 t RH 真空处理炉→5 流圆坯连铸机工艺生产Ф400 mm铸坯GCr15SiMn 轴承钢.通过优质废钢添加铁水降低入炉料有害元素及P、S 含量;控制出钢碳在0.20%-0.30%;出钢过程中铝脱氧,确保Alsol≥0.020%;LF 精炼渣碱度控制在4.5-6.5,RH 高真空（≤67 Pa）脱气时间大于15 min;弱搅拌时间≥20 min;RH 严格控制钢水上连铸温度,连铸采用低过热度浇注和合理的结晶器及末端电磁搅拌参数,使铸坯凝固时产生更小的成分偏析,等轴晶和柱状晶的分布更加均匀.Tianjin Tianguan Special Steel Company Limited adopts a process route of 100 t EccentricBottom Tapping （EBT） EAF→100 t Ladle Furnace→100 t RH Vacuum Treatment Furnace - 5 StrandRound Bloom Caster to produce Ф400 mm round billet of GCr15SiMn bearing steel. Measures weretaken as the following reducing detrimental elements and P and S contents in burden by quality scrapand molten iron, controlling tapping carbon content within 0.20%-0.30%, deoxidizing with aluminumduring tapping and ensuring Alsol ≥0.020%, controlling LF slag basicity at the range of 4.5-6.5,ensuring the degassing time for RH high vacuum （≤67 Pa） longer than 15 minutes, keeping softstirring time longer than 20 minutes, strictly controlling the temperature of steel arriving at the caster,and adopting low superheat pouring and reasonable mold and F-EMS parameters to restrain compositionsegregation during round billet solidification and make the distribution of equiaxed grain and columnarcrystal more uniform.

关 键 词：EAF-LF-RH-CCM流程 偏心底出钢 大规格 轴承钢 成分偏析 圆坯 

分 类 号：TF762.4[冶金工程—钢铁冶金]