Brand: SUP9 Material Name: Spring Steel ● Standard: JIS G48001:2005
Characteristics and scope of application: SUP9 spring steel has high strength, plasticity, and toughness, good hardenability, lower overheating sensitivity than manganese steel, lower decarburization tendency than silicon manganese steel, and greater tempering brittleness. Used in the production of heavy-duty and high stress plate springs and large-diameter coil springs in the vehicle and tractor industry.
chemical composition 
Silicon Si: 0.17-0.37
Sulfur S: ≤ 0.030
Chromium Cr: 0.65-0.95
Nickel Ni: ≤ 0.35
Copper Cu: ≤ 0.25
Vanadium V: 0.10~0.20
mechanical property 
Tensile strength σ b (MPa): ≥ 1225 (125)
Conditional yield strength σ 0.2 (MPa): ≥ 1080 (110)
Elongation rate δ 5 (%): ≥ 9 (for reference)
Shrinkage rate of cross-section (%): ≥ 20
Hardness: Hot rolled, ≤ 321HB;
Cold drawing+heat treatment, ≤ 321HB
Corresponding to each country's brand, corresponding to the US brand: G51550
Corresponding domestic brand: 55CrMnA
Corresponding German brand: 55Cr3
Corresponding UK brand: 5258
Corresponding French brand: 55Cr3

1. The company has established long-term and stable cooperative relationships with multiple well-known steel mills at home and abroad, all of which provide original material certification
2. Wholesale and retail, with favorable prices, superior quality (large quantities are preferred), and timely and fast delivery
3. Wide channels, sufficient supply of goods, and business scope covering all parts of the country, can meet the needs of customers in various regions
Sincerely welcome new and old customers from all walks of life to call and inquire about and negotiate business at any time. Our high-quality products and reasonable prices will definitely meet your requirements!
Welcome new and old customers to call for consultation and negotiation.