φ100 mm and φ105 mm products of bearing steel GCr15SiMn (%:1. 00C
0. 5Si
1. 0Mn
1.45Cr
0.02Al) have been developed by 60t EAF-LF(VD)-300 mm×360 mm bloom casting-continuous rolling 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 stiring 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.