The 20mn2 is of medium strength. Cold deformation when the plastic is high, low-temperature performance is good, weldability and cutting properties are OK.
Compared with the corresponding carbon-containing carbon steel, its hardenability is higher, the critical quenching diameter in the oil is up to 4~15 mm, but the heat treatment has overheating, decarbonization sensitivity and tempering brittleness tendency.
This type of steel, because of the appropriate hardenability, after the appropriate metal heat treatment, microstructure for uniform solicit, bainite or very fine pearlite, and thus has a high tensile strength.
Phosphorus p: ≤0.025
Sulfur s: ≤0.025
Tensile strength ≥785mpa
Yield Limit ≥590mpa
Elongation rate ≥10%
Cross section shrinkage rate ≥40%
Shock absorption ≥47aku2/j
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