20Mn2 alloy structural steel
Standard: GB/T 3077-1999
Main characteristics
Has moderate intensity. High plasticity during cold deformation, good low-temperature performance, and acceptable weldability and machinability. Compared with carbon steel with corresponding carbon content, it has higher hardenability, with a critical hardenability diameter of 4-15 mm in oil. However, it is prone to overheating, decarburization sensitivity, and temper brittleness during heat treatment.
This type of steel, due to its appropriate hardenability, has a microstructure of uniform martensite, bainite, or extremely fine pearlite after appropriate metal heat treatment, thus possessing high tensile strength.
chemical composition
Carbon C: 0.17-0.24
Silicon Si: 0.17-0.37
Manganese Mn: 1.40~1.80
Phosphorus P: ≤ 0.025
Sulfur S: ≤ 0.025
Chromium Cr: ≤ 0.30
Nickel Ni: ≤ 0.30
Copper Cu: ≤ 0.25
mechanical property 
Tensile strength ≥ 785MPa
Yield limit ≥ 590MPa
Elongation rate ≥ 10%
Sectional shrinkage rate ≥ 40%
Impact absorption energy ≥ 47Aku2/J
Hardness: ≤ 187HB
Heat treatment process
Tempering temperature/℃ 220 coolant water Air heat treatment: quenching (water, oil quenching), quenching 850 times, tempering (water, air cooling), carburizing.
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