Chemical composition of mass fraction (%):
Carbon C: 0.12 ~ 0.18
Si Si: 0.17 ~ 0.37
Manganese Mn: 1.10 ~ 1.40
Sulfur S: to allow the residual content of ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.40 ~ 0.70
Ni: to allow the residual content of ≤ 0.030
Copper Cu: to allow the residual content ≤ 0.030
Mechanical properties
Sample size [blank]
15mm
[Heat]
Quenching temperature (℃): 880; Coolant: Oil
Tempering heating temperature (℃): 200; coolant: water, air
[Mechanical properties]
Tensile strength σb (MPa): ≥ 785 (80)
Yield strength σs (MPa): ≥ 590 (60)
Elongation δ5 (%): ≥ 12
Reduction of area ψ (%): ≥ 50
Impact energy Akv (J): ≥ 47
Impact toughness αkv (J/cm2): ≥ 59 (6)
Brinell hardness (HBS100/3000) (annealing or tempering condition): ≦ 179
Key Features
Is a good hardenability carburizing steel. High surface hardness, good wear resistance.
Application examples
For the manufacture of gears, worm gear, plastic mold, and steam turbine shaft seal, etc.
