12Mn2VB非调质钢材表面质量的改善

An Improvement on Surface Quality of Non-Quenching-Tempering Steel 12Mn2VB

本钢特钢采用EBTEAF LF冶炼 复合保护渣 (% :16～ 2 0C ,≥ 10Al2 O3,35～ 4 0SiO2 ,10～ 16CaO)浇注 6 5 0kg钢锭生产 0 10 %～ 0 15 %C的 12Mn2VB非调质钢 80～ 95mm方轧材时出现 1mm深裂纹 ,钢材表面C含量局部高达 0 6 2 %。在采用EBTEAF LF冶炼 降低渣中C含量的复合保护渣 (% :≤ 12C ,≥ 10Al2 O3,35～4 0SiO2 ,10～ 16CaO)浇注 3 16t钢锭后 ,轧材表面增碳明显减小 ,有效控制表面裂纹的产生 ,成材率由 74 %提高到 82 %。

The 1 mm deep cracks occurred at surface of 80～95 mm square bars of 12Mn2VB non-quenching-tempering steel containing 0.10%～0.15% C produced by EBT EAF-LF steelmaking-650kg ingot casting with compound casting powder: 16～20C, ≥10Al 2O 3, 35～40SiO 2, 10～16CaO at Special Steel Co Ltd, Benxi Iron and Steel, and the C content of surface at parts of an area was up to 0.62%. After using improved process - EBT EAF- LF steelmaking-3.16t ingot casting with lower C content compound casting powder: ≤12C, ≥10Al 2O 3, 35～40SiO 2, 10～16CaO, the surface recarburization of rolled products obviously deceased which was available to control surface crack formation, therefore the yield of finished products increased to 82% from 74%.