RESEARCH ON FORMING MECHANISMS AND CONTROLLING MEASUREMENTS FOR SURFACE LIGHT SPOT DEFECTS OF GALVANIZING STEEL COILS FOR AUTOMOBILE USE
When producing high surface quality galvanizing steel coils for automobile use,there are always many light spots on the surface since Hansteel CGL No.1 has been put into operation.The defect samples were analyzed by SEM and EDS.The result shows that cause for light spot is not only one.There are more Mn and P in high strength auto sheet,which can result in difficulty to be cleaned off the oxide on the hot rolled coils,so the defects coming.This is why the defects come with high strength auto sheet.When coils galvanized,the defects can”t be covered up.To the contrary,the defects will be more obvious when zinc growing on the surface.And sometimes zinc or residue can adhere to work rolls when strips passing through SPM.The deposits then press normal coating.So the light spots come more.When the defect comes from pressing,there is no defect on steel base.The causation is found and measures were taken including high pressure cleaning equipments adopted.Result shows that the defects disappeared.
auto sheet CGL light spot SEM
WEI Guangmin SUN Haiyan SHI Jianqiang WANG Lianxuan WU Haihong
Handan Iron and Steel Group Co.,Ltd. of HBIS,Handan 056015,Hebei,China
国内会议
杭州
英文
583-588
2015-11-11（万方平台首次上网日期，不代表论文的发表时间）