... , 4.steel Grade:SUP9,SAE5160,SUP12V,51CrV4 Spring flat steel Bar is one of our main products, so delivery time and ... (A),60Si2CrA,55SiMnVB and so on.2.Standard:GB1222,JISG4801,ASTM ,DIN.3.Size:1.0*3-80*600mm*L.4 ... .MOQ:15MT each sizes.Meanwhile, we also supply spring steel bar by cold drawn + oil heat treatment, and diameter is from ...