ZG-12超低磷钢90 t BOF-RH-CC工艺的生产实践  

Production Practice of 90 t BOF-RH-CC Process for ZG-12 Ultra-low Phosphorus Steel

作　　者：杨丽梅 印传磊 马庆丰 翟万里[1] 刘从德[2] 左辉[1] Yang Limei;Yin Chuanlei;Ma Qingfeng;Zhai Wanli;Liu Congde;Zuo Hui(Technology Center,Huaigang Special Steel Co.,Ltd.,Jiangsu Shagang Group,Huai'an 223002;Steelmaking Works,Huaigang Special Steel Co.,Ltd.,Jiangsu Shagang Group,Huai'an 223002)

机构地区：[1]江苏沙钢集团淮钢特钢股份有限公司技术中心,淮安223002 [2]江苏沙钢集团淮钢特钢股份有限公司炼钢厂,淮安223002

出　　处：《特殊钢》2023年第1期15-18,共4页Special Steel

摘　　要：对钢厂采用90 t转炉冶炼超低磷钢(%/:<0.03C,<0.010P,<0.015S,<0.06Mn,<0.02Cr,<0.02Ni),转炉终点钢液温度偏低、过氧化严重,需经过LF升温精炼等问题,进行了工艺优化试验研究,结果表明:转炉(0.018%~0.025%P)出钢过程中使用石灰和精炼渣,形成二元碱度为7、<0.5%P_(2)O_(5)炉渣,可使钢包钢水脱磷率达到75%,成品磷含量低于0.010%,冶炼时间缩短3~4 min。同时,转炉吹炼终点钢液温度升高,钢包脱磷率呈降低趋势,转炉最佳终点温度为1630~1655℃。通过采用钢包精炼脱磷技术,超低磷钢冶炼流程缩短为转炉吹炼→RH处理→连铸,减少LF精炼工序。In the ligth of problems of smelting ultra-low phosphorus steel(%/:<0.03 C、<0.010 P、<0.015 S、<0.06 Mn、<0.02 Cr、<0.02 Ni),the lower liquid temperature at 90 t BOF tapping and serious overoxidation of liquid,led to heating refining by LF,are tested and studied by process optimization.The results show that during BOF(0.018%-0.025%P)tapping process by adding lime and refining slag to produce slag with binary alkalinity 7 and P_(2)O_(5)<0.5%,the dephosphorization rate of liquid in ladle reaches up to 75%,the phosphorus content of finished products is less than 0.010%,the smelting time is shortened by 3~4 min.At the same time,the dephosphorization rate of ladle decreases with the increase of liquid steel temperature at the end of converter blowing,the BOF optimum end-point temperature is between 1630℃and 1655℃.By adopting ladle dephosphorization technology,the smelting process of ultra-low phosphorus steel is shortened to converter blowing→RH treatment→continuous casting,and the LF refining process is omited.

关 键 词：超低磷钢 钢包 炉渣 转炉出钢过程脱磷 

分 类 号：TF713[冶金工程—钢铁冶金]