10B21 material low carbon steel wire rod use for making screws and fasteners. Manufacturing Process:Pickling and coating; Drawing; Anealing; Inspection;Pickling and Coating ... ,10B18,10B21,10B28,10B33,SWCH6A,SWCH8A,SWCH15A,SWCH18A,SWCH22AChemical Compositions of SAE10B21:C:0.18-0.23;Si<=0.10;Mn:0 ... -0.003 CHQ Steel wire rod 10B21 refined steel wire for making fasteners