... 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 ... , hot rolled/forged/ Heat Treatment(optional), Forged/ hot rolled alloy steel bar 4140