... alloy steel bar 1)ASTM,JIS,DIN,BS,NF 2)4140,5140,5145,5150,4130,4137,8620,8615 Forged/ hot rolled alloy steel bar 41401)Standard: ASTM,JIS,DIN ... ,BS,AISI2)Grade: 4140,5140,5145,5150,4130,4137,8620,8615,SCM430,8650,25CrMo4,4340,sk53 ... + VD, hot rolled/forged/ Heat Treatment(optional), Forged/ hot rolled alloy steel bar 4140