|
|
Mechanism analysis and control of cold rolled edge strip defects of high strength IF steel |
WANG En-rui1, CHEN Zi-gang1, LIU Feng-lin1, LI Bin1, ZHANG Ming2 |
1. Technology Center, HBIS Group Hansteel Company, Handan 056015, Hebei, China; 2. School of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, Hebei, China |
|
|
Abstract The causes of black strip defects on the surface of HC250IF and its structural features and control measures during different processes were analyzed by optical microscope, scanning electron microscope, energy spectrum analysis and pickling simulation test. The results show that the fields near strip edge have been over pickled owing to the uneven distribution of oxide scale and insufficient scale breaking effects of tension straightening mill in the width direction of strip. Under the existing of surface enrichment and grain boundary segregation for phosphorus, HCl solution erodes the matrix grain boundary preferentially after removing the surface oxide scale. The erosion process develops along the grain boundaries and forms erosion channels, which extend from the strip surface to the inside, resulting in structure characteristic of staggered distribution of porous area and rough area with certain thickness difference. After cold rolling, the metal in the porous area deforms intensively, and a large number of micro-cracks are formed along the rolling direction. The present of cracks strengthens the roughness difference of surface locally, and leads to the strip defect with color difference near the edge area of cold rolled strip. On the basis for optimizing matching of hot rolling and pickling process parameters and improving the surface state of hot rolling strip steel before pickling, the occurrence of such defects can be effectively reduced by controlling the pickling process and improving the quality uniformity of pickling.
|
Received: 09 March 2022
|
|
|
|
[1] |
闫文凯, 俞飞. 冷轧基料酸洗后表面黑条纹原因分析[J].中国冶金,2018,28(3):60.
|
[2] |
崔秋艳, 黄爱建, 程洋, 等. 酸洗板山水画缺陷产生机理及影响因素的分析[J]. 中国冶金, 2019,29(7):44.
|
[3] |
黄先球, 卢鹰, 杨大可, 等.冷轧酸洗钢板表面黑斑缺陷分析[J].钢铁,2005,40(5):72.
|
[4] |
宋鹏.冷轧酸洗带钢表面发黑的原因及解决方案[J].冶金丛刊,2011(2):19.
|
[5] |
胡洪林, 马孝娟. 热轧酸洗板的表面质量控制[J].新疆钢铁,2010(2):1.
|
[6] |
马亚博. 酸洗板表面质量控制[J].梅山科技,2011(5):60.
|
[7] |
姜春芳. 磷在高磷钢中的分布及对09CuPCrNi钢电化学行为的影响[J].钢铁,1991,26(1):38.
|
[8] |
邱以清, 刘振宇, 周国平, 等.含磷0.08%铸轧薄带的研究[J].热加工工艺,2013,42(11):1.
|
[9] |
周国平, 刘振宇, 陈俊. 磷的表面逆偏析对铸轧薄带钢耐候性能的影响[J].腐蚀科学与防护技术,2010,22(3):157.
|
[10] |
万兰凤, 马植甄. 磷元素的非平衡晶界偏聚对A690M海洋环境用钢耐海水腐蚀性能的影响[J].腐蚀与防护,2017,38(10):747.
|
[11] |
朱微微. 含P高强IF钢中P的偏聚及析出行为[D]. 武汉: 武汉科技大学,2014.
|
[12] |
董汉君, 王银军. 影响热轧带钢氧化铁皮酸洗质量和速度的因素[J].机械工程材料,2009,33(3):83.
|
[13] |
孙宁, 杨迪, 张杰, 等. 含磷高强钢板拉矫破鳞过程的氧化铁皮剥离机理[J].钢铁,2021,56(1):59.
|
[14] |
叶东东, 邵素娟, 杨子良, 等.拉矫参数对带钢氧化皮剥离及酸洗性能的影响[J].表面技术,2015,44(7):125.
|
[15] |
孙彬. 热轧工艺参数和供氧差异对氧化铁皮结构和厚度的影响[J].热加工工艺,2014,43(15):27.
|
[16] |
Chen R Y, Yuen W Y D. 终轧和卷取温度对热轧带钢表面氧化铁皮结构和酸洗性能的影响[J].世界钢铁,2007,(5):59.
|
[17] |
王恩睿, 陈子刚, 柳风林, 等. 热轧结构钢氧化铁皮结构及其对酸洗质量的影响[J].钢铁,2022,57(3):71.
|
[18] |
张盛攀, 焦安杰, 代玖林, 等. 轧制工艺对高强耐候钢表面氧化铁皮的影响[J].中国冶金,2021,31(7):105.
|
|
|
|