【摘要】 用100 t EAF-LF(VD)-300 mm×320 mm连铸-连轧工艺生产的48MnV钢(%:0.45～0.51 C、0.90～1.20Mn、0.05～0.10V)出现粗大晶粒,经13道次轧成的125 mm×125 mm方钢(0.030%～0.050%Ti)的晶粒度为3～4级,经9道次轧成的Φ141 mm圆钢(0.030%～0.053%Ti)的晶粒度为4～5级;但通过加0.018%～0.035%Ti和0.021%～0.029%Nb后,经9道次轧制的Φ141 mm圆钢的晶粒度达5.5～6.5级,显著提高钢的强韧性。更多还原

【Abstract】 Coarse grains occurred in the non-quenched-tempered steel 48MnV(%:0.45～0.51C,0.90～1.20Mn, 0.05～0.10V) produced by 100 t EAF-LF(VD)-300 mm×320 mm casting-continuous rolling process.As added 0.030%～0.050%Ti in steel,the rating of grain in 125 mm×125 mm square bar rolled with 13 passes was 3～4;the rating of grain inΦ141 mm round bar(contained 0.030%～0.053%Ti) rolled with 9 passes was 4～5;but as added 0.018%～0.035%Ti and 0.021%～0.029%Nb in steel,the rating of grain inΦ141 mm round bar rolled with 9 passes was 5.5～6.5 in order to obviously increase strength and toughness of steel.更多还原