What is the steel 45Mn hardness?

45Mn steel is one of the high-quality carbon structural steel, which can replace 40Cr steel in making the mechanical Parts. It has high strength, hardness, wear resistance and good toughness.

Mechanical properties of 45Mn steel

Tensile strength σb (MPa): ≥620(63)

Yield strength σs (MPa): ≥375(38)

Elongation δ5 (%): ≥15

Reduction of area ψ (%): ≥40

Impact energy Akv (J): ≥39

Impact toughness value αkv (J/cm2): ≥49(5)

45Mn Hardness: unheated ≤241HB; annealed steel ≤217HB

Chemical composition of 45Mn steel

Carbon C: 0.42～0.50

Silicon Si: 0.17～0.37

Manganese Mn: 0.70～1.00

Sulfur S: ≤0.035

Phosphorus P: ≤0.035

Chromium Cr: ≤0.25

Nickel Ni: ≤0.25

Copper Cu: ≤0.25