Sep 15, 2023
Chemical composition of 780M40 alloy steel
780M40 Chemical composition.
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780M40 Chemical composition:
Carbon C: 0.38 ~ 0.43
Silicon Si: 0.15 ~ 0.35
Manganese Mn: 0.75 to 1.00
Sulfur S: ≤0.040
P: ≤0.030
Chromium: 0.80 ~ 1.10
Nickel Ni: ≤0.030
Copper: ≤0.030
Molybdenum Mo: 0.15 ~ 0.25
780M40 Mechanical properties:
Tensile strength σb (MPa) : ≥1080(110)
Yield strength σs (MPa) : ≥930(95)
Elongation δ5 () : ≥12
Section shrinkage ratio ψ () : ≥45
Impact power Akv (J) : ≥63
Impact toughness value αkv (J/cm2) : ≥78(8)
Hardness: ≤217HB