65Mn spring steel 
 Description: 
 Standard: GB / T 1222-1984 
 Features and Scope: 
 65Mn spring steel, manganese improve the hardenability, φ12 mm steel oil can hardenability, surface decarburization tendency smaller than silicon, the mechanical properties after heat treatment is better than carbon steel, but the thermal 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. 
 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: ≤ 0.25 
 Copper Cu: ≤ 0.25 
 Chemical 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 and microstructure: 
 Specification of heat treatment: quenching 830 ° C ± 20 ° C, cold oil; tempering 540 ° C ± 50 ° C (special needs, ± 30 ° C). 
 The metallographic organizations: troostite. 
 Delivery status: delivery of hot-rolled steel to heat treatment or heat treatment condition, cold drawn steel to heat treatment delivery. 
 Supplier specifications: 
 Coiled: Φ5.5 ~ 16mm 
 Roll: Φ120 ~ 150mm 
 Forging: Φ160 ~ 450mm 
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