无取向电工钢冶炼过程氧含量控制
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摘要
无取向硅钢的磁性能与钢的洁净度水平密切相关。为实现对无取向电工钢冶炼过程氧含量的合理控制,分析了无取向电工钢冶炼过程碳氧含量变化数据,热力学计算转炉终点临界碳含量与炉渣a_(Feo)。结果表明:随着转炉终点碳含量的降低,终点氧含量升高且波动范围大,合理出钢碳含量应控制为0.03%～0.05%;为满足炉渣中T.Fe≤24%的现场生产要求,终点碳含量应高于0.031%;钢包底吹氩气可有效降低钢液中过剩氧,降低钢液的平均碳氧积;据现场生产数据,RH精炼前理想碳、氧含量应控制为0.025%～0.035%和500×10~(-6)～650×10~(-6),相应转炉终点碳含量控制为0.03%～0.04%。
The magnetic properties of non-oriented electrical steels are closely related to the cleanliness level.In order to achieve reasonable control of oxygen in non-oriented electrical steel smelting process,the change of carbon and oxygen content were analyzed,the critical carbon content at the end-point of BOF and a_(FeO) in slag were also calculated.The results show that with the decrease of end-point carbon content,the end-point oxygen content increases and fluctuates widely.The ideal carbon content in tapping should be controlled at 0.03% ～0.05%.It is required that the content of T.Fe in slag should be ≤24% and the end-point carbon content should be higher than 0.031%.Ladle botton argon blowing can effectively reduce excess oxygen and decrease carbon-oxygen product in molten steel.According to production data,the ideal carbon and oxygen content should be controlled at 0.025% ～0.035% and 500 x 10~(-6)～650 x 10~(-6) before RH refining,and the end-point carbon content of BOF should be controlled at 0.03% ～0.04%.
The magnetic properties of non-oriented electrical steels are closely related to the cleanliness level.In order to achieve reasonable control of oxygen in non-oriented electrical steel smelting process,the change of carbon and oxygen content were analyzed,the critical carbon content at the end-point of BOF and a_(FeO) in slag were also calculated.The results show that with the decrease of end-point carbon content,the end-point oxygen content increases and fluctuates widely.The ideal carbon content in tapping should be controlled at 0.03% ～0.05%.It is required that the content of T.Fe in slag should be ≤24% and the end-point carbon content should be higher than 0.031%.Ladle botton argon blowing can effectively reduce excess oxygen and decrease carbon-oxygen product in molten steel.According to production data,the ideal carbon and oxygen content should be controlled at 0.025% ～0.035% and 500 x 10~(-6)～650 x 10~(-6) before RH refining,and the end-point carbon content of BOF should be controlled at 0.03% ～0.04%.
引文
[1]徐匡迪,肖丽俊.特殊钢精炼中的脱氧及夹杂物控制[J].钢铁,2012,47(10):1-13.
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[3]张明博,秦哲,仇圣桃,等.超低碳钢BOF渣成分对终点[C]含量影响[J].北京科技大学学报,2015,37(11):1422-1428.
[4]岳峰,崔衡,李朋欢,等.RH冶炼超低碳钢的最优工艺研究[J].北京科技大学学报,2009,31(s1):53-57.
[5]张锦刚,李德刚,于功力,等.IF钢生产过程中RH-TB真空脱碳效果的工艺研究[J].钢铁,2006,41(6):32-34.
[6]李朋欢,包燕平,岳峰.超低碳钢的转炉终点控制[J].钢铁,2011,46(10):27-31.
[7]曲英.炼钢学原理,第二版[M].北京:冶金工业出版社,1980:138-142.
[8]蔡开科.转炉冶炼低碳钢终点氧含量控制[J].钢铁,2009,44(5):27-31.
[9]李远洲.氧气转炉炼钢过程的解析与控制[M].北京:冶金工业出版社,2018:48-52.
[10]Kim S H,Song B.Thermodynamic Aspects of Steel Reoxidation Behavior by the Ladle Slag System of CaO-MgO-Si02-Al_2O_3-FetOMn0-P_2O_5[J].Metallurgical&Materials Transactions B,1999,30(3):435 442.
[11]冯聚和.铁水预处理与钢水炉外精炼[M].北京:冶金工业出版社,2006:145-150.
[12]蔡开科.转炉-精炼-连铸过程钢中氧的控制[J].钢铁,2004,39(8):49-57.
[2]Suito H,Inoue R.Thermodynamics on Control of Inclusions Composition in Ultra Clean Steels[J].Transactions of the Iron&Steel Institute of Japan,1996,36(5):528-536.
[3]张明博,秦哲,仇圣桃,等.超低碳钢BOF渣成分对终点[C]含量影响[J].北京科技大学学报,2015,37(11):1422-1428.
[4]岳峰,崔衡,李朋欢,等.RH冶炼超低碳钢的最优工艺研究[J].北京科技大学学报,2009,31(s1):53-57.
[5]张锦刚,李德刚,于功力,等.IF钢生产过程中RH-TB真空脱碳效果的工艺研究[J].钢铁,2006,41(6):32-34.
[6]李朋欢,包燕平,岳峰.超低碳钢的转炉终点控制[J].钢铁,2011,46(10):27-31.
[7]曲英.炼钢学原理,第二版[M].北京:冶金工业出版社,1980:138-142.
[8]蔡开科.转炉冶炼低碳钢终点氧含量控制[J].钢铁,2009,44(5):27-31.
[9]李远洲.氧气转炉炼钢过程的解析与控制[M].北京:冶金工业出版社,2018:48-52.
[10]Kim S H,Song B.Thermodynamic Aspects of Steel Reoxidation Behavior by the Ladle Slag System of CaO-MgO-Si02-Al_2O_3-FetOMn0-P_2O_5[J].Metallurgical&Materials Transactions B,1999,30(3):435 442.
[11]冯聚和.铁水预处理与钢水炉外精炼[M].北京:冶金工业出版社,2006:145-150.
[12]蔡开科.转炉-精炼-连铸过程钢中氧的控制[J].钢铁,2004,39(8):49-57.