摘要:
为降低成本,在Q195带钢原有生产工艺80 t转炉→吹氩→LF→连铸的基础上去掉了LF精炼工序。为保证铸坯质量不影响产品的性能,采用示踪法、金相、氧氮测试、大样电解和扫描电镜等研究方法,对铸坯中非金属夹杂物的成分和来源进行分析。氩后钢中[O]高达226×10-6,[N]为33×10-6;不同炉次中,尾坯中[O]高达251×10-6,[N]为37×10-6;显微夹杂物和大型夹杂物含量都很高,多以复合夹杂物和复合夹杂物存在于铸坯中。因此需要采用稳定浇注工艺,改进中间包结构以改善流场,防止卷渣。同时加强保护浇注减少二次氧化现象的发生。
关键词:
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Q195 /
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矩形坯 /
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夹杂物 /
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示踪法 /
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氧氮含量
Abstract:
Q195 steel is mainly used for strip production.In order to reduce the cost,the LF refining process is removed on the basis of the original process 80 t converter→argon blowing→LF→continuous casting.In order to ensure the slab quality does not affect the product performance,the composition and source of the non-metallic inclusions in the slab are analyzed by tracer method,metallographic,oxygen and nitrogen test,large sample electrolysis and scanning electron.After argon blowing[O]in the steel is up to 226×10-6,[N]is 33×10-6;For different heats,[O]in the tail billet is up to 251×10-6,and[N]is 37×10-6.The contents of micro-inclusions and large inclusions are high,and-MnO composite inclusions and-CaO composite inclusions are present in the slab.Therefore,a stable casting process is necessary,and the tundish structure shall be modified to improve the flow field to prevent slag entraping,hhile protection pouring shall be strengthen to reduce the occurrence of secondary oxidation.
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