Cause analysis of and solution to furnace roller pick-up in the high strength automotive steel sheet processing line

摘要

Cold-rolled high strength steel sheets for automobiles contain more Mn and Si based alloy elements,which, under the reducing atmosphere in the annealing furnace,will get enriched on the strip surface.Since the furnace rollers and the strips contact frequently,alloy elements on the roller surface will form hard protuberance.We call this protuberance "pick-up".In addition,with the increase of the amount of dust in the furnace atmosphere,the occurrence of furnace roller pick-up will also increase.Through chemical reaction and physical accumulation analysis combined with practical experience,the causes of pick-up in different furnace sections were analyzed.Methods of preventing furnace roller pick-up in the high strength steel sheet processing line were discussed and solutions to improving the strip surface quality in the continous annealing furnace were provided.