... , 51XX,41XX series by ASTM, 20Mn5, 28Mn6, 30Mn5 series by DIN, 150M19, 150M28,185H40 serie Structural Alloy Steel BarWe are professional ... bar bystandard ASTM A6M A322 A355 A434 A739, JIS G4052, DIN 1652-21.Standard:GB/T799,ASTM A29,A108,A321,A575 ... ,5135,5132,5140,5145,5147,5150,4118,4130,4137,3330By DIN:20Mn5,28Mn6,30Mn5,34Mn5, 36Mn7, 50Mn7, 37MnSi5, 46MnSi4,17Cr3, 15Cr3 ...