40 crnimo chemical composition and mechanical properties
Chemical composition:
Carbon C 0.37 ~ 0.44
Silicon Si 0.17 ~ 0.37
Manganese Mn0.50 ~ 0.80,
Sulfur S allow residual content acuities were 0.025,
P P allow residual content acuities were 0.025,
Chrome Cr 0.60 ~ 0.90,
Nickel Ni 1.25 ~ 1.65,
Copper Cu allow residual content acuities were 0.025,
Molybdenum Mo0.15 ~ 0.25.
Mechanical properties
Tensile strength σ b (MPa) : 980 (100) or
Yield strength σ s (MPa) : 835 (85) or
Elongation δ 5 (%) : 12 or more
Reduction of area ψ (%) : 55 or
Impact work Akv (J) : 78 or more
Impact toughness value α kv (J/cm&sup 2) : was 98 (10)
Sample size: sample blank dimensions to 25 mm
Heat treatment: (quenching 850 degrees; cooling agent: oil; tempering temperature 600 degrees; cooling agent: water, oil);
Steel annealing or high temperature tempering supply state brinell hardness GBW acuities were 269;
|
|
