关键词: 150 t顶底复吹转炉, 350 mm x470 mm连铸, 轴承钢

Abstract: With using process measures including quality hot metal, catch carbon practice to control top and bottom combined blown converter end [C] ≥ 0.20% , [Als]≥ 0.030% before adding slag making materials in LF refining, refining slag (FeO + MgO) ≤ 1.0% , RH ≤ 100 Pa refining ≥ 15 min, extend of overheating of liquid in casting ≤ 30 ℃ , mold electromagnetic stirring and dynamic light reduction at solidification front, the average T[O] in bearing steel GCr15 produced at Bensteel is ≤8 x 10^-6, [Ti] ≤25 x 10^-6，[Ca] ≤ 10 x 10^-6, the rating of center porosity bloom is 0.5-1.0, the rating of shrinkage cavity is 0-1.0 and the ratio of equiaxed zone is 41.5%-43.2%.