石钢GCr15SiMn轴承钢的开发

Pilot Production of Bearing Steel GCr15SiMn at Shijiazhuang Steel

石钢通过60t电弧炉-LF(VD)精炼-300mm×360mm矩坯连铸-连轧工艺生产Φ90mm、Φ100mm、Φ105mm轴承钢GCr15SiMn(%:1.00C、0.5Si、1.0Mn、1.45Cr、0.02Al)。通过电弧炉无渣出钢、LF精炼渣碱度≥3.5,VD处理和全程保护浇铸,低拉速(0.40～0.55m/min),弱二冷(0.18～0.25L/kg),电磁搅拌等工艺措施,使[O]≤8×10^(-6),钢中非金属夹杂物总级别2.5～3.0级,无发纹,疏松和偏析≤1.0级,碳化物不均匀性均满足标准要求。

Ф90 mm,Ф100 mm and Ф105 mm products of bearing steel GCr15SiMn （% ： 1.00C, 0. 5Si, 1.0Mn, 1.45Cr, 0. 02Al） have been developed by 60 t EAF-LF （VD） - 300 mm× 360 mm bloom casting-continuous roiling process at Shijiazhuang Steel. With EAF eccentric bottom taping, controlling LF refining slag basicity ≥3.5, VD treating, completely shielded and low speed casting （0. 40 -0. 55 m/min）, weak secondary cooling （0. 18 - 0. 25 L/kg） and electromagnetic stirring etc. process measures, the [O] was ≤8 × 10^-6, the total rating of inclusions in steel was ≤2. 5 -3.0 with free flake, the rating of porosity and segregation ≤ 1.0, and the non-homogeneity of carbide met requirement of standard.