... sizes spring steel plate. Steel grade:SUP11A 60Si2Mn,65Si7,SUP9,SUP9A,SAE5160H,50CrVA,SAE615. Spring steel plates and Spring round ... φ12φ50 flat45×5120×12 60×1390×20 Spring steel GB1222JIS G48013),SUP10roundφ12φ50 flat45×5120× ... 12 60×1390×20 Spring steel GB1222JIS G4801 4),SUP9(A)roundφ12φ ... φ12φ50 flat45×5120×12 60×1390×20 Spring steel GB1222JIS G4801 6),55SiMnVBroundφ12φ50 flat45× ...