1).spring flat bar 2).High carbon steel 3).The high strength medium carbon steel 4).Good cold-work plasticity 1.steel grade: SUP9,SUP9A,SUP10,SUP7,SUP12,SUP12V,SUP6,SUP7,SAE9254,SAE5160,SAE9260,SAE6150,55Cr3,51CrV4,52CrMoV4,55Si7,60Si7,28MnSiB,58CrMnB4,27MnMoVB,65Mn,55CrSi,50CrV,60Si2Mn,CK67,60Si2CrVA,60Si2CrMnA 2.Size: T1.0-50*W1000-3000*L 3.Usage:machinery,mechanical parts,instruments,auto ...