60SiMn5 spring steel Material Name: spring steel Standard: GB / T 1222-1984 ● Features and Scope: 60SIMN5 strength and hardness than other high-carbon structural steel to be high, but slightly lower elasticity, its revenue performance and 65,70,75, 80 steel were similar, hardenability is not high, 7-20mm diameter coil spring and spring washer spring ring. 60SIMN5 for the manufacture of small cross-sectional size and strength to withstand vibration spring is not too high, such as the collet chuck, precision machine screw, cutter, screw collar roller bearings, railway vehicles, cars, tractors and general machinery on flat circular spiral spring and spring as well as other uses steel spring wire and so on. 2 Chemical composition ● Chemical Composition: 60SIMN5 Carbon C: 0.55-0.65 Si Si: 1.00-1.30 Mn Mn: 0.90-1.10 sulfur S: ≤0.050 phosphorus P: ≤ 0.050 Chromium Cr: ≤0.25 Ni-Ni: ≤0.007 3 Mechanical Properties ● Mechanical Properties: Tensile strength σb (MPa): ≥1127 (115) yield strength σs (MPa): ≥980 (100) Elongation δ10 (%): ≥6 section shrinkage ψ (%): ≥30 Hardness: Hot-rolled ≤302HB; Cold Drawn + heat treatment ≤321HB; annealed steel ≤255 Blank sample size / mm: Sample 4 treatment specifications ● Heat treatment and microstructure: heat treatment specifications: quenching 820 ℃ ± 20 ℃, oil cooling; return fire 480 ℃ ± 50 ℃ (when special needs, ± 30 ℃). ● Delivery status: hot-rolled steel to heat treatment or heat treatment delivery, cold-drawn steel to heat treatment delivery. Quenched and tempered spring steel is a railway track, pillow shells of steel, there is no similar domestic steel, the working conditions are very bad, to bear various forms of stress and deformation and damage