Material Name: SUP7
● Features and application:
SUP7 is widely used silicon-manganese spring steel, strength, flexibility and higher hardenability than 55Si2Mn. For railway vehicles, automobile and tractor industry to bear a greater load on the production of flat spring 30mm or less in diameter coil spring, is also suitable for production of the following operating temperature of 250 ℃ heat-resistant non-corrosive medium under alternating load spring and and work under high stress the important roll the large spring.
● Chemical Composition:
Carbon C: 0.56 ~ 0.64 Si Si: 1.50 ~ 2.00
Manganese 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:
Tensile strength σb (MPa): ≥ 1274 (130)
Yield strength σs (MPa): ≥ 1176 (120)
Elongation δ10 (%): ≥ 5
Reduction of area ψ (%): ≥ 25
Hardness: hot, ≤ 321HB; cold-drawn + heat treatment, ≤ 321HB
