High Carbon Spring Steel Wire Use for making compression spring, extension spring, torsion spring , mattress spring , flat control cable , etc. Diameter:0.20---12.0mm Wire Rod Material: 45# ,60#, 65# ,65Mn, 70#,72A,72B, 80#, 82B Standard: DIN17223, EN10270-1, JIS G 3521, ASTM A227 , GB4357-89 Tensile Strength: B,C grade / SM,DM;SH,DH/ SWB, SWC Surface : Smooth , Lead Patented heat treatment and Phosphated. Package : Coil or Spider Delivery time : 15-20 days , after PI signature. Hot Dip Galvanized wire and Electric Galvanized wire , also supply. Certificate: ISO9001 , ISO14001 , SGS and NANTONG FAMOUS BRAND