... 1.Material: 65, 70, 75, 85, 65Mn, etc 2.Thickness:0.15mm-2.0mm 3.Width:30mm-355mm Specification of Spring Steel ... 70, 75, 85, 65Mn, 55SiMnV, 60Si2MnA, 60Si2CrA, etc.2.Thickness:0.15mm-2.0mm3.Width:30mm-355mm4.Hardness:≥100HV5.Surface Treatment: grey ... 0.25 ≤0.035≤0.03555Si2Mn0.52-0.601.50-2.000.60-0.90≤0.35 ≤0.035≤0. ... 03560Si2Mn0.56-0.641.50-2.000.60-0.90≤0.35 ≤0.035≤0.03560Si2MnA0 ...