摘要
结合某厂的生产实际,对超低碳钢M2A1不同工序阶段、头坯及正常坯夹杂的数量、形貌、成分进行了分析,找到了超低碳钢头坯夹杂物偏高的主要原因,并通过优化开浇准备工作、开浇吨位、氩气控制,采用塞棒代替普通钢质开浇管进行开浇,对中包开浇升速曲线进行优化及按照不同断面设定出苗时间等措施,使头坯质量得到一定的改善。优化后,头坯沿浇铸方向的T.O和N含量、夹杂物总量及数量都有不同程度的降低,沿头坯浇铸方向2.5 m处w(T.O)从优化前的0.003 6%降低到0.002 5%,每10 kg铸坯中夹杂物总量由11.50 mg降低到8.26 mg,单位面积夹杂物个数由8.73个降至6.26个,铸坯沿头坯浇铸方向2.5 m处达到正常坯水平。
Combined with the actual production of a certain factory,the number,pattern,component of head slab,normal slab and different processing stages for ultra low carbon steel M2A1 were analyzed,and the main reasons of the high inclusion content in the head slab were found out.By optimizing the cast starting preparations,cast starting tonnage,argon gas control,using stopper instead of common steel cast-starting pipe,optimizing the cast-starting speed curve in the tundish,and setting emergence time according to different sections,the quality of the head slab was improved.The content of[T.O]and[N]and inclusions contents were decreased along with the casting direction.The mass fraction of[T.O]decreased from 0.003 6% to 0.002 5% at the position of 2.5 m along head slab.The total amount of inclusions decreased from 11.50 mg/10 kg to 8.26mg/10 kg,and inclusion number per unit area decreased from 8.73/mm2 to 6.26/mm2,which were close to those of normal slab after the position of 2.5 m along head slab.
出处
《炼钢》
CAS
北大核心
2014年第3期64-68,78,共6页
Steelmaking
关键词
二次氧化
卷渣
塞棒
开浇曲线
reoxidation
slag entrapment
stopper
casting-starting curve
