forged square steel bar AISI4140 square bar with size (160-500)*(160-800)mm Length:10m max MOQ:20T Cert.:MTC,EN10204-3.1 forged square steel bar AISI4140 Material :AISI 4140,GB 42CrMo,DIN 42CrMo4Origin:ChinaSize(160-500)*(160-800)mmLength:10m maxApplication:MachineryMOQ:20TUT:SEP 1921 Class C/cHeat treatment:quenched and temperedChemical composition : C :0.38~0.45 Si:0.17~0.37 Mn:0.50~0.80 S :0≤0 ...