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%.