... 65Mn, SUP9, SUP7, 55CR3, 50CRV4, SAE5160, SA spring steel flat barOur main distribution Nanjing, Xing Cheng, Daye and other manufacturers ... spring flat steel, the material is complete, complete specifications, the quality ... tractor industries bear a greater load on the production of flat wire in the spring or coil spring 30mm below, also ...