1.spring flat steel 2.competive price and good product ... *L, 4.steel Grade:SUP9,SAE5160,SUP12V,51CrV4 Spring flat steel Bar is one of our main products, so delivery ... in making parts and equipments such as auto spring,motor spring,truck spring,and exported to 30 countries and regions .About ... .7.MOQ:15MT each sizes.Meanwhile, we also supply spring steel bar by cold drawn + oil heat treatment, and diameter ...