X70M管线钢终冷温度偏差大原因分析及工艺改进
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摘要
针对湛江钢铁4 200mm厚板轧机生产X70M管线钢时,冷床上钢板上表面呈现明显的带状氧化铁皮现象,不仅影响钢板表面质量,而且造成钢板终冷温度波动。从机械、工艺两方面进行深入分析,通过除鳞打击试验验证钢板宽度方向除鳞效果,并结合带状氧化铁皮对钢板经Mulpic快速冷却后终冷温度均匀性的影响,对精轧除鳞工艺制度进行改进,在确保钢板终轧温度的基础上,可以通过合理布局除鳞道次进行改进,新增除鳞道次越接近终轧末道次,除鳞效果越显著,并对除鳞喷嘴安装及维护提出可行性方案,现场生产实践证明,上述策略能够改善X70M管线钢除鳞效果。
The ribbon iron oxide phenomenon of X70 Mpipeline steel on cooling bed,which produced by 4 200 mm heavy plate mill of Zhanjiang Iron and Steel Co.,Ltd.not only affected the surface quality,but also caused the final cooling temperature fluctuation of the heavy plate.The effect of descaling in the width direction of the heavy plate was validated by the descaling test through in-depth analysis from mechanical and technological aspects.Combined with the effect of ribbon iron oxide on the finishing cooling temperature uniformity of steel plate after Mulpic rapid cooling,the descaling process system of finishing rolling was improved.On the basis of ensuring the final rolling temperature of the steel plate,the scale removal could be improved through the rational layout and new addition of descaling passes.The nearer the descaling pass was to the final pass of final rolling,the more significant the descaling effect was.A feasible scheme for the installation and maintenance of the descaling nozzle was proposed.Field application showed that the descaling of X70 Mpipeline steel could be improved by means of the above strategy.
The ribbon iron oxide phenomenon of X70 Mpipeline steel on cooling bed,which produced by 4 200 mm heavy plate mill of Zhanjiang Iron and Steel Co.,Ltd.not only affected the surface quality,but also caused the final cooling temperature fluctuation of the heavy plate.The effect of descaling in the width direction of the heavy plate was validated by the descaling test through in-depth analysis from mechanical and technological aspects.Combined with the effect of ribbon iron oxide on the finishing cooling temperature uniformity of steel plate after Mulpic rapid cooling,the descaling process system of finishing rolling was improved.On the basis of ensuring the final rolling temperature of the steel plate,the scale removal could be improved through the rational layout and new addition of descaling passes.The nearer the descaling pass was to the final pass of final rolling,the more significant the descaling effect was.A feasible scheme for the installation and maintenance of the descaling nozzle was proposed.Field application showed that the descaling of X70 Mpipeline steel could be improved by means of the above strategy.
引文
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[3]牛延龙,刘清友,贾书君,等.X80级高强低合金管线钢组织与冲击韧性[J].钢铁,2019,54(2):67.
[4]张朝晖,刘安民,赵福才,等.氧化铁皮综合利用技术的发展[J].钢铁研究,2008,36(1):59.
[5]吴祝民.热轧带钢氧化铁皮的成因及对策[J].轧钢,2007,24(3):56.
[6]卞皓,殷胜.梅钢热轧厚规格带钢氧化铁皮控制工艺[J].中国冶金,2018,28(5):18.
[7]汪水泽,刘洋,孙宜强,等.CSP流程薄规格热轧带钢氧化铁皮控制技术[J].钢铁,2018,53(1):54.
[8]孟宪明.管线钢的化学成分和性能分析[J].山西冶金,2010(3):22.
[9]魏天斌.热轧氧化铁皮的成因及去除方法[J].钢铁研究,2003,32(4):54.
[10]王鹏飞.热轧高强带钢氧化铁皮的去除方法[J].中国冶金,2017,27(11):47.
[11]宋涛,闵宏刚.热轧钢板红色氧化铁皮形成原因分析[J].甘肃冶金,2001,12(4):27.
[12]姜海军,戴文笠,陈功彬.韶钢3 450mm中厚板生产线钢板表面带状条纹缺陷的分析与对策[J].宽厚板,2016,22(1):15.
[13]邬早勤,尹绍江,王云阁.中厚板生产线除鳞系统的优化与改进[J].宽厚板,2016,22(2):23.
[14]李玉峰.热连轧厂高压水除鳞泵组系统节能改造[J].中国冶金,2015,25(3):41.
[15]杨德正,敖锋,陈红军.高压水除鳞系统管路预充水方式的选择[J].中国冶金,2018,28(8):53.
[16]王建功,周旬,夏银锋.控制板坯在粗轧区产生氧化铁皮的措施[J].河北冶金,2016(3):51.
[17]李和平,黄泽民,谢宏钟.CSP线高压除鳞装置喷嘴堵塞分析与处理[J].冶金动力,2016(7):1.
[18]李忠波,高照海,李亮亮.中厚板表面氧化铁皮的形成原因及控制措施[J].钢铁研究,2012,40(3):50.