低铁水比下钢水中氮的控制
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摘要
湖南华菱涟源钢铁公司在降低铁水比的过程中,为控制氮含量,通过转炉加发热剂进行补热,优化氧枪枪位,减少转炉补吹、过吹、控制终点碳质量分数为0.03%～0.06%,终点温度不低于1 580℃;优化转炉出钢过程钢包底吹流量,采用非镇静出钢;LF炉首次送电1档电流起弧时间1min以上,钢包底吹流量小于320L/min、优化LF处理过程中钢包底吹流量,最终控制铁水比在72%以下,控制转炉氩站钢水w([N])≤0.003 5%,LF增氮量w([N])≤0.002 0%,中间包钢水w([N])≤0.006 0%的比例由83.9%提高到99.8%,满足控氮钢种对氮的控制要求。
During the process of reducing the hot metal ratio at the 210 ton converter in Hunan Valin Lianyuan Iron and Steel Co Ltd,through adding compensation heating in the BOF,optimizing the oxygen lance position,decreasing the reblowing and over-blowing,controlling the end carbon during 0.03%-0.06% and control the end temperature no less than 1 580℃to prevent the nitrogen content beyond the upper limit.Optimizing the bottom blow flow of the ladle during the tapping,and adopt non-skilled tapping.The 1 st current arcing time is more than 1 min during the first power transmission,the flow rate of the bottom blowing of the ladle is less than 320 L/min and the bottom blow flow of the ladle is optimized during the LF treatment.The hot metal water ratio is reduced to 72%,the w([N])in the steel after tapping is less than 0.003 5%,the w([N])pickup of the liquid steel is less than 0.002 0%during the LF treatment,and the proportion of the w([N])in tundish steel less than 0.006 0% increased from 83.9% to99.8%,which meeting the nitrogen control requirements of the nitrogen control steel by using the above technologies.
During the process of reducing the hot metal ratio at the 210 ton converter in Hunan Valin Lianyuan Iron and Steel Co Ltd,through adding compensation heating in the BOF,optimizing the oxygen lance position,decreasing the reblowing and over-blowing,controlling the end carbon during 0.03%-0.06% and control the end temperature no less than 1 580℃to prevent the nitrogen content beyond the upper limit.Optimizing the bottom blow flow of the ladle during the tapping,and adopt non-skilled tapping.The 1 st current arcing time is more than 1 min during the first power transmission,the flow rate of the bottom blowing of the ladle is less than 320 L/min and the bottom blow flow of the ladle is optimized during the LF treatment.The hot metal water ratio is reduced to 72%,the w([N])in the steel after tapping is less than 0.003 5%,the w([N])pickup of the liquid steel is less than 0.002 0%during the LF treatment,and the proportion of the w([N])in tundish steel less than 0.006 0% increased from 83.9% to99.8%,which meeting the nitrogen control requirements of the nitrogen control steel by using the above technologies.
引文
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[16]李晶,傅杰,冯炳文,等.溶解氧对钢液吸氮影响的研究[J].钢铁,2002,37(4):19.(LI Jing,FU Jie,FENG Bing-wen,et al.Study on effect of soluble oxygen on nitrogen absorption of liquid steel[J].Iron and Steel,2002,37(4):19.)
[2] Hudd R C.Some aspects of the annealing of low carbonstrip steel[J].Metals and Materials,1987,3(2):71.
[3] Morrison W R.Nitrogen in the steel product[J].Ironmaking and Steelmaking,1989,16(2):123.
[4]胡晓光.RH精炼过程增氮行为探讨[J].中国冶金,2018,28(4):45.(HU Xiao-guang.Discussion on nitrogen increasing behavior in RH refining process[J].China Metallurgy,2018,28(4):45.)
[5]何云龙,孙维,金友林,等.RH精炼工艺脱氮的影响因素[J].中国冶金,2015,25(2):47.(HE Yun-long,SUN Wei,JIN You-lin,et al.Influence factors of nitrogen removal in RH refining process[J].China Metallurgy,2015,25(2):47.
[6]毛新平,孙新军,康永林,等.薄板坯连铸连轧Ti微合金化钢的物理冶金学特征[J].金属学报,2006,42(10):1091.(MAO Xin-ping,SUN Xin-jun,KANG Yong-lin,et al.Physical metallurgy for the titanium microalloyed strip produced by thin slab casting and rolling process[J].Acta Metallurgica Sinica,2006,42(10):1091.)
[7]黄希祜.钢铁冶金原理[M].北京:冶金工业出版社,2004.(HUANG Xi-hu.Principle of Iron and Steel Metallurgy[M].Beijing:Metallurgical Industry Press,2004.)
[8] The Iron and Steel Institute of Japan.Tekkobinran II(Ironmaking and Steelmaking)[M].Tokyo:Maruzen,1979.
[9]陶镳.转炉炼钢过程中钢水氮含量影响因素分析[J].现代冶金,2009,37(3):39.(TAO Biao.Analysis of influencing factors of nitrogen content in molten steel during converter steelmaking[J].Modern Metallurgy,2009,37(3):39.)
[10]迟云广,邓志银,朱苗勇.泡沫渣对120t转炉钢液脱氮的影响[J].特殊钢,2017,38(4):40.(CHI Yun-guang,DENG Zhiyin,ZHU Miao-yong.Effect of foaming slag on removal of nitrogen in liquid during 120tBOF steelmaking process[J].Special Steel,2017,38(4):40.)
[11]王新华.钢铁冶金-炼钢学[M].北京:高等教育出版社,2007.(WANG Xin-hua.Iion and Steel Metallurgy Steelmaking[M].Beijing:Higher Education Press,2007.)
[12]冯聚,艾立群.铁水预处理与钢水炉外精炼[M].北京:冶金工业出版社,2006.(FENG Ju,AI Li-qun.Hot Metal Pretreatment and Molten Steel Refining Outside Furnace[M].Beijing:Metallurgical Industry Press,2006.)
[13]蔡开科.连铸坯质量控制[M].北京:冶金工业出版社,2010.(CAI Kai-ke.Quality Control of Continuous Casting Billet[M].Beijing:Metallurgical Industry Press,2010.)
[14]沈岸明,刘国庆.X80管线钢生产过程氮的控制实践[J].中国冶金,2014,24(9):39.(SHEN An-ming,LIU Guo-qing.Nitrogen control of X80pipeline steel production process[J].China Metallurgy,2014,24(9):39.)
[15]张鉴.炉外精炼的理论与实践[M].北京:冶金工业出版社,1999.(ZHANG Jian.Theory and Practice of Secondary Refining[M].Beijing:Metallurgical Industry Press,1999.)
[16]李晶,傅杰,冯炳文,等.溶解氧对钢液吸氮影响的研究[J].钢铁,2002,37(4):19.(LI Jing,FU Jie,FENG Bing-wen,et al.Study on effect of soluble oxygen on nitrogen absorption of liquid steel[J].Iron and Steel,2002,37(4):19.)