45Mn2, alloy structural steel.

Standard: GB / T 3077-1999

[Main features]

The carbon steel is quenched and tempered steel, strength, wear resistance and hardenability were higher in the critical oil quenching diameter 10 ~ 25mm, the critical quenching in water 22 to 45 in diameter. After quenching with good mechanical properties, can be cutting good; but when heat sensitivity and heat tend to temper brittleness, water quenching easy to crack, white point sensitive to cold welding and plastic deformation and low defects.

[Application Examples]

This steel is generally used in the quenched state, can also be used in normalizing the state, suitable for manufacture of high stress and wear conditions in the work of the parts. When the workpiece diameter less than 60mm, the performance and 40Cr steel quite. Tractors and general machinery in the automotive manufacturing, for the manufacture of universal joint shafts, axles, connecting rod cap, friction plate, worm, gear, gear shaft, shaft tram and steam locomotive, carriage shafts, heavy-duty frame and cold-drawn state bolts and nuts and so on.

Chemical composition
[] Chemical composition (mass fraction) (%)

Carbon C: 0.42 ~ 0.49

Si Si: 0.17 ~ 0.37

Manganese Mn: 1.40 ~ 1.80

Sulfur S: to allow the residual content of ≤ 0.35

Phosphorus P: allow the residual content of ≤ 0.35

Chromium Cr: allow the residual content of ≤ 0.30

Ni: to allow the residual content of ≤ 0.30

Copper Cu: to allow the residual content of ≤ 0.30