Experimental Research on Micro-pit Defects of SUS 430 Stainless Steel Strip in Cold Rolling Process

摘要

In order to improve surface glossiness of stainless steel strip in tandem cold rolling,experimental research on micro-pit defects of SUS 430 ferrite stainless steel was investigated in laboratory.The surface morphology of micro-pit defects was observed by SEM.The effects of micro-pit defects on rolling reduction,roll surface roughness and emulsion parameters were analyzed.With the pass number increasing,the quantity and surface of micro-pit defects were reduced,uneven peak was decreased and gently along rolling direction,micro-pit defects had equally distributed tendency along tranverse direction.The micro-pit defects were increased with the roll surface roughness increase.The defects ratio was declined with larger gradient at pass number 1 to 3,but gentle slope at pass number 4 to 5.The effects of temperature 55℃ and 63℃,concentration 3％ and 6％ of emulsion on micro-pit effects had not obvious difference.Maintain of micro-pit was effected by rolling oil or air in the micro-pit,the quality of oil was much more than the air in the micro-pit in lubrication rolling.