Material: 20Cr-40Cr, 20Mn-65Mn, 15CrMo-42CrMo, 20Mn2-40Mn2, 20CrNiMoA-40CrNiMoA, 38CrSi, 30CrMnSi, 20CrMnTi, 9CrSi, 9Mn2 spring steel Diameter:0.22-5.00mmMechanical Spring used in furniture,automobile seat and cushion and indoor decoration etc.Diameter:0.22-5.00mmTensile Strength of Steel wireGrade Tensile Strength(Mpa)A1 1180-1380A2 1380-1580A3 1580-1780A4 1780-1980A5 1980-2180A6 2180-2380