● Grade: SUP9
● Name of material: spring steel
● Standard: JIS G48001: 2005
● Features and application:
Advantage is a good hardenability, while thermal processing properties, mechanical properties, good resistance to decarburization performance is also a large section of a variety of important springs, such as cars, motorcycles large spring, spiral spring.
SUP9 spring steel with high strength, ductility and toughness, good hardenability, heat-sensitive than the low-manganese, silico-manganese steel decarburization tendency than the small, temper brittleness.
SUP9 spring steel used for cars, tractors and industrial production of heavy load, stress and a larger spring diameter larger coil spring.
● Chemical Composition:
Carbon C: 0.52 ~ 0.60 Si Si: 0.17 ~ 0.37
Manganese Mn: 0.65 ~ 0.95
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.030
Chromium Cr: 0.65 ~ 0.95
Ni-Ni: ≤ 0.35
Copper Cu: ≤ 0.25
Vanadium V: 0.10 ~ 0.20 [1]
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 1225 (125)
Conditions yield strength σ0.2 (MPa): ≥ 1080 (110)
Elongation δ5 (%): ≥ 9 (for reference)
Reduction of area ψ (%): ≥ 20
Hardness: hot, ≤ 321HB;
Cold Drawn + heat treatment, ≤ 321HB
