Good translation of the Metal Products (Shanghai) spring steel companies (domestic and spring steel 65Mn spring steel / 65Mn steel plate / 65Mn steel bars / 65Mn steel coils / 65Mn steel strip / 65Mn steel pipe / 65Mn steel wire (good translation / import spring steel) metal products ( Shanghai) Co., Ltd.) 
 Introduction 
 65Mn, manganese improve hardenability and hardenability φ12 mm steel oil surface decarburization tendency smaller than silicon, the mechanical properties after heat treatment is better than carbon steel, but there are overheating sensitivity and temper brittleness. Used for a variety of flat, small size, round spring, cushion spring spring spring spring ring can also be produced, valve springs, clutch springs, brake springs, cold rolled and cold drawn steel wire coil spring. 
 Use 
 65Mn steel strength and hardness. High flexibility and hardenability than 65 steel, with a thermal sensitivity and tendency to temper brittleness, water quenching the formation of the crack tendency. Annealed machinability can still be cold deformation plasticity, poor weldability. Under moderate load plate spring, 7-20mm diameter coil spring and spring washer spring ring. High wear resistance parts, such as the grinding machine spindle. Spring chuck precision machine screw. Cutter. Spiral roller bearing ring. Railway rails, etc. 
 Chemical composition 
 Carbon C: 0.62 ~ 0.70 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.90 ~ 1.20 
 Sulfur S: ≤ 0.035 
 Phosphorus P: ≤ 0.035 
 Chromium Cr: ≤ 0.25 
 Ni - Ni: ≤ 0.30 
 Copper Cu: ≤ 0.25 
 Mechanical properties 
 Tensile strength σb (MPa): ≥ 980 (100) 
 Yield strength σs (MPa): ≥ 784 (80) 
 Elongation δ10 (%): ≥ 8 
 Section shrinkage ψ (%): ≥ 30 
 Hardness: hot, ≤ 302HB; Cold Drawn + heat treatment, ≤ 321HB 
 Heat treatment 
 Quenching 830 ° C ± 20 ° C, cold oil; tempering 540 ° C ± 50 ° C (special needs, ± 30 ° C). 
 Delivery status: delivery of hot-rolled steel to heat treatment or heat treatment condition, cold drawn steel to heat treatment delivery. 
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 (Good translation of the Metal Products (Shanghai) Co., Ltd. published) 
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