Good translation of the Metal Products (Shanghai) spring steel companies (domestic spring steel / import spring steel) SUP7 spring steel / SUP7 steel plate / SUP7 steel bars SUP7 coil / SUP7 strip / SUP7 steel pipe / wire SUP7 (best translated Metal Products (Shanghai ) Co., Ltd.) 
 Material Name: SUP7 
 ● Features and Scope: 
 Application of a wide range of silico-manganese spring steel, strength, flexibility and hardenability sexual slightly higher than that of 55Si2Mn. Suitable for rolling stock, produced to withstand a larger load of the flat spring or diameter less than 30mm coil spring on the automobile and tractor industries, but also suitable for the production of the operating temperature below 250 ℃, non-corrosive medium heat spring as well as to withstand the alternating load and work under high stress, large rolling spring. 
 ● chemical composition: 
 Carbon C: 0.56 ~ 0.64 
 Silicon Si: 1.50 ~ 2.00 
 Mn Mn: 0.60 ~ 0.90 
 Sulfur S: ≤ 0.035 
 Phosphorus P: ≤ 0.035 
 Chromium Cr: ≤ 0.35 
 Ni - Ni: ≤ 0.35 
 Copper Cu: ≤ 0.25 
 ● Mechanical Properties: 
 Σb (MPa), tensile strength: ≥ 1 274 (130) 
 Yield strength σs (MPa): ≥ 1176 (120) 
 Elongation δ10 (%): ≥ 5 
 Section shrinkage ψ (%): ≥ 25 
 Hardness: hot, ≤ 321HB; Cold Drawn + heat treatment, ≤ 321HB 
 ● Heat treatment and microstructure: 
 Specification of the heat treatment: quenching 870 ° C ± 20 ° C, cold oil; tempering 480 ° C ± 50 ° C (special needs, ± 30 ° C). 
 The metallographic Organization: Troostite. 
 Delivery status: the state of hot-rolled steel to heat treatment or no heat treatment delivery, 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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