焊丝钢ER70S-6氧化铁皮机械剥离性能研究
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摘要
通过扭转试验和扫描电镜评价了焊丝钢ER70S-6的氧化皮剥离性能。氧化皮和基体之间存在的铁硅氧化物Fe_2SiO_4(2Fe0·SiO_2)和FeO为主要成分的富硅层,在机械折弯及砂带打磨过程中难以除净,使焊丝表面镀铜效果及焊接性能恶化。提出了通过提高加热炉加热段温度至985℃、提高均热段温度至1 110℃,进而阻碍氧向富硅层的扩散;建立PF线保温墙和保温通廊,进而促进FeO的歧化反应;缩短精轧机换辊时间3 h,进而减少氧化铁皮对铁基体的压入;降低吐丝速度至90 m/s、提高吐丝温度至930℃进而增加氧化铁皮厚度等方式来改善ER70S-6表面氧化皮剥离性能。工艺优化后,ER70S-6表面氧化铁皮由粉末状脱落变为片层状脱落,粗细拔半成品表面间断性发黑现象消失,镀铜层平均厚度由1.45μm增加至3.6μm,表面光亮度显著提高。
Descaling property of oxide scale of welding wire ER70 S-6 was studied by twisting test and by scanning electron microscopy.It was found that,silicon rich layer with iron-silicon oxide Fe2 Si0_4(2 FeO · Si02)and FeO as the main component just outside of the matrix is difficult to be eliminated completely by mechanical bending and abrasive belt grinding,and thus to deteriorate copper plating effect and welding performance of the wire product.With measures including impeding diffusion of oxygen into the silicon-rich layer by increasing the temperature of the heating section to 985 ℃and soaking section to 1 110℃ in heating furnace,to promote disproportionation reaction of FeO by establishing the thermal insulation wall and by established thermal insulation corridor around the PF line,to decrease the indentation of oxide scale to the matrix by shortening the roll change time of the finishing mill for 3 h,increasing thickness of oxide scale by reducing the spinning speed to 90 m/s and increasing the spinning temperature to 930 ℃,the effect of mechanical descaling of oxide scale is improved.The peeling form of oxide scale changed from the powder to the lamellar,the intermittent blackening of semi-finished product disappeared,the average thickness of the copper plating layer increased from 1.45 μm to3.6 μm,and the surface brightness was significantly improved through the process optimization.
Descaling property of oxide scale of welding wire ER70 S-6 was studied by twisting test and by scanning electron microscopy.It was found that,silicon rich layer with iron-silicon oxide Fe2 Si0_4(2 FeO · Si02)and FeO as the main component just outside of the matrix is difficult to be eliminated completely by mechanical bending and abrasive belt grinding,and thus to deteriorate copper plating effect and welding performance of the wire product.With measures including impeding diffusion of oxygen into the silicon-rich layer by increasing the temperature of the heating section to 985 ℃and soaking section to 1 110℃ in heating furnace,to promote disproportionation reaction of FeO by establishing the thermal insulation wall and by established thermal insulation corridor around the PF line,to decrease the indentation of oxide scale to the matrix by shortening the roll change time of the finishing mill for 3 h,increasing thickness of oxide scale by reducing the spinning speed to 90 m/s and increasing the spinning temperature to 930 ℃,the effect of mechanical descaling of oxide scale is improved.The peeling form of oxide scale changed from the powder to the lamellar,the intermittent blackening of semi-finished product disappeared,the average thickness of the copper plating layer increased from 1.45 μm to3.6 μm,and the surface brightness was significantly improved through the process optimization.
引文
[1]吴树雄.金属焊接材料手册[M].北京:化学工业出版社,2008:5-6.
[2]唐晓梅.盘条表面缺陷对焊丝镀铜质量的影响[J].金属制品,2012,38(04):12-15.
[3]中村,王怀宇.板材加热时氧化铁皮的高温剥离性[J].宽厚板,1997,3(6):43-46.
[4]周铖,麻晗,黄文克.ER70S-6焊丝钢盘条表面氧化皮压人分析[J].金属热处理,2011,36(12):120-123.
[5]李文晓,陈刚,郭慧英,等.低C高Si高Mn合金钢表面氧化皮剥壳性能分析[J].上海金属,2017,39(1):44-48.
[6]Takeda M.Influence of Silicon Content on the Structure and Adhesion of Primary Scale on Si Containing Steel[J].R&D Kobe Seikogiho,2005,55(1):31-36.
[7]曹光明,石发才,孙彬,等.汽车大梁钢的氧化铁皮结构控制与剥落行为[J].材料热处理学报,2014,35(11):161-167.
[8]朱传清.ER70S-6热轧盘条氧化铁皮结构分析及工艺优化[A].中国金属学会.第十一届中国钢铁年会论文集-S03.轧制与热处理[C].中国金属学会:2017:3.
[9]李贵平,陈鼎勋,刘升.帘线钢盘条生产中表面氧化铁皮的控制[J].南方金属,2010,31(1):34-37.
[10]孙彬,刘振宇,邱以清,等.低碳钢表面FeO层空气条件下等温转变行为的研究[J].钢铁研究学报,2010,22(2):34-40.
[11]Chen R Y and Yuen W Y D.Oxidation of Low-Carbon,Low-Silicon Mild Steel at 450~900℃Under Conditions Relevant to Hot-Strip Processing[J].Oxidation of Metals,2002,57(2);53-80.
[12]Bhattacharya R,Jha G and Kundu S,et al.Influence of Cooling Rate on the Structure and Formation of Oxide Scale in Low Carbon Steel Wire Rods during Hot Rolling[J].Surface&Coatings Technology,2005,201(3):526-532.
[2]唐晓梅.盘条表面缺陷对焊丝镀铜质量的影响[J].金属制品,2012,38(04):12-15.
[3]中村,王怀宇.板材加热时氧化铁皮的高温剥离性[J].宽厚板,1997,3(6):43-46.
[4]周铖,麻晗,黄文克.ER70S-6焊丝钢盘条表面氧化皮压人分析[J].金属热处理,2011,36(12):120-123.
[5]李文晓,陈刚,郭慧英,等.低C高Si高Mn合金钢表面氧化皮剥壳性能分析[J].上海金属,2017,39(1):44-48.
[6]Takeda M.Influence of Silicon Content on the Structure and Adhesion of Primary Scale on Si Containing Steel[J].R&D Kobe Seikogiho,2005,55(1):31-36.
[7]曹光明,石发才,孙彬,等.汽车大梁钢的氧化铁皮结构控制与剥落行为[J].材料热处理学报,2014,35(11):161-167.
[8]朱传清.ER70S-6热轧盘条氧化铁皮结构分析及工艺优化[A].中国金属学会.第十一届中国钢铁年会论文集-S03.轧制与热处理[C].中国金属学会:2017:3.
[9]李贵平,陈鼎勋,刘升.帘线钢盘条生产中表面氧化铁皮的控制[J].南方金属,2010,31(1):34-37.
[10]孙彬,刘振宇,邱以清,等.低碳钢表面FeO层空气条件下等温转变行为的研究[J].钢铁研究学报,2010,22(2):34-40.
[11]Chen R Y and Yuen W Y D.Oxidation of Low-Carbon,Low-Silicon Mild Steel at 450~900℃Under Conditions Relevant to Hot-Strip Processing[J].Oxidation of Metals,2002,57(2);53-80.
[12]Bhattacharya R,Jha G and Kundu S,et al.Influence of Cooling Rate on the Structure and Formation of Oxide Scale in Low Carbon Steel Wire Rods during Hot Rolling[J].Surface&Coatings Technology,2005,201(3):526-532.