... 60Si2Mn,65Si7,SUP9,SUP9A,SAE5160H,50CrVA,SAE615. Spring steel plates and Spring round bar1),Steel grade:60Si2Mn,65Si7,SUP9,SUP9A ... ,SUP11A SAE5160H,50CrVA,SAE6150H.2),65Mn:Specroundφ12φ50 flat45×5120×12 ... 1390×20 SortSpring steel StandardGB1222JIS G4801 5),SUP7Specroundφ12φ50 flat45×5120×12 60×1390×20 SortSpring steel StandardGB1222JIS G4801 ...