I. Introduction of 20Mn2SiCrMo alloy structural steel.

20Mn2SiCrMo is an alloy structural steel, but also carburized steel. Executive Standard: GB/T 3077-1999. 20Mn2SiCrMo has medium strength, high plasticity when cold deformation, good low temperature performance, weldability and machinability is still possible. 20Mn2SiCrMo and the corresponding carbon content of carbon steel, its hardenability is high, the critical hardening diameter in oil up to 4 ~ 15 mm, but the heat treatment has overheating, decarburization sensitivity and tempering brittleness tendency. 20Mn2SiCrMo because it has Suitable hardenability, after suitable metal heat treatment, the microstructure is uniform soxhite, bainite or very fine pearlite, and thus has high tensile strength.

Second, 20Mn2SiCrMo alloy structural steel 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

Third, 20Mn2SiCrMo alloy structural steel mechanical properties.

Tensile strength ≥ 785MPa Yield limit ≥ 590MPa Elongation ≥ 10%

Fractional shrinkage ≥ 40% Impact absorbed work ≥ 47 Aku2/J Hardness: ≤ 187HB

Four, 20Mn2 alloy steel plate applications.

20Mn2SiCrMo is used to manufacture the surface and heart requirements are not high, cross-sectional size <50mm diameter carburized parts, such as automobiles, tractors and machine tool manufacturing instead of 20Mn2SiCrMo steel carburized pinion, small shaft, low requirements of the piston pin, cross pin head, diesel engine sleeve, valve top rod, gearbox lever, steel bushings, etc.. In addition, this steel in the hot-rolled and normalized state can also be used in the manufacture of riveted parts and screws, nuts, etc..

20Mn2SiCrMo Structural Steel