介绍了天钢采用120 t BOF→LF→VD→CC工艺流程生产轴承钢GCr15的实践。在铁水磷含量较高的情况下,通过使用复吹转炉留渣与双渣吹炼法脱磷,实现了转炉终点高碳低磷出钢,C含量平均为0.32%,P含量平均为0.0095%。LF精炼过程中选用高碱度（R...介绍了天钢采用120 t BOF→LF→VD→CC工艺流程生产轴承钢GCr15的实践。在铁水磷含量较高的情况下,通过使用复吹转炉留渣与双渣吹炼法脱磷,实现了转炉终点高碳低磷出钢,C含量平均为0.32%,P含量平均为0.0095%。LF精炼过程中选用高碱度（R=7~9）的Ca O-Si O2-A12O3系精炼渣强化精炼深脱氧、脱硫,在不进行预脱硫处理工艺条件下保证了成品中[S]≤0.005%。VD真空处理后保证软吹氩时间大于20 min,镇静时间不少于10 min,以去除更多的夹杂物。最终铸坯中氧含量平均为6×10^-6,夹杂物尺寸较小,铸坯质量良好,实现了轴承钢GCr15稳定生产。展开更多
The transformation of inclusions was studied when control technology of refining top slag in ladle furnace was used in X80 pipeline steelmaking.Sufficient amount of aluminum was added to experimental heats for final d...The transformation of inclusions was studied when control technology of refining top slag in ladle furnace was used in X80 pipeline steelmaking.Sufficient amount of aluminum was added to experimental heats for final deoxidation during BOF tapping,and then the refining top slag with high basicity and strong reducibility was adopted to transform Al 2 O 3 to inclusions with low melting point.The results show that the composition of inclusions changes in order of "Al 2 O 3 → MgO-Al 2 O 3 system→ CaO-MgO-Al 2 O 3 system→ CaO-Al 2 O 3 system".And the inclusions after LF refining are liquid or semi-liquid state at the temperature of steelmaking,which are easily removable to obtain high cleanliness steel by collision,agglomeration and flotation.展开更多
文摘The transformation of inclusions was studied when control technology of refining top slag in ladle furnace was used in X80 pipeline steelmaking.Sufficient amount of aluminum was added to experimental heats for final deoxidation during BOF tapping,and then the refining top slag with high basicity and strong reducibility was adopted to transform Al 2 O 3 to inclusions with low melting point.The results show that the composition of inclusions changes in order of "Al 2 O 3 → MgO-Al 2 O 3 system→ CaO-MgO-Al 2 O 3 system→ CaO-Al 2 O 3 system".And the inclusions after LF refining are liquid or semi-liquid state at the temperature of steelmaking,which are easily removable to obtain high cleanliness steel by collision,agglomeration and flotation.
