45钢Φ10mm材冷镦裂纹的分析和工艺改进措施

An Analysis on Cold Upsetting Crack of 0.45C Steelφ10 mm Products and Process Improved Measures

通过对新抚钢40 t LD-钢包吹氩-CC-高速线材轧制的φ10mm 45钢冷镦裂纹的分析,得出钢中Al_2O_3、MnS夹杂和片状珠光体组织是冷镦裂纹产生的主要原因。通过采用降低炉料中的硫含量使[S]从0.029%降至0.020%,控制LD终点[C]和降低终点[O],轧材经球化退火后钢的伸长率从21.6%提高到30.4%等措施,避免了冷镦裂纹的发生。

According to analysis on cold upsetting crack of 0. 45C steel φ10 mm rolled products produced by 40 t LD-ladle argon blowing- CC- high speed rod mill process flow sheet at New Fushun Steel, it was obtained that the inclusions Al2O3, MnS and the lamellar pearlite in steel were main reason to form cold upsetting crack. With decreasing the sulphur content in charge, decreasing [S] from 0. 029% to 0. 020%, controlling LD end [C] and decreasing end [O], spheroidizing annealing rolled products to increase elongation of steel from original 21.6% to 30. 4% , the formation of cold upsetting crack was avoided.