Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 50Mn2 alloy structural steel / 50Mn2 steel plate / 50Mn2 steel bars / 50Mn2 coil / 50Mn2 strip / 50Mn2 steel pipe / 50Mn2 wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 50Mn2, alloy structural steel. 
 Standard: GB / T 3077-1999 
 The main characteristics of 
 This is a high strength quenched and tempered carbon manganese steel, which has high strength, elasticity and wear resistance, hardenability is high in oil critical hardenability 10 ~ 28mm in diameter, in the water critical hardenability diameter 24 ~ 49mm, machinability is acceptable. Can get a higher overall mechanical properties after quenching and tempering of this steel, heat treatment, thermal sensitivity and temper brittleness, also have a tendency to crack when the water quenching, and the white spot sensitive, poor welding, cold deformation plasticity. 
 [Application Examples] 
 This steel is usually used in the quenched and tempered, for the manufacture of parts under conditions of high stress and wear, manufacturing performance parts less than the diameter of 80mm steel 45Cr similar; can also be used after normalizing and high-temperature tempering, used in the manufacture of medium load, large parts of the cross-section dimensions. For example: the heavy machinery used for rolling bearing spindle axis and the large gear; car on the drive spline shaft as well as to withstand impact load of spindle; as gears, worm gear shaft, crankshaft, connecting rod and other general machinery. In addition, this steel can be used to make the plate spring and flat spring coiling. 
 Chemical composition 
 Chemical composition (mass fraction) (%) 
 Carbon C: 0.47 ~ 0.55 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 1.40 ~ 1.80 
 Phosphorus P: ≤ 0.025 (residual content) 
 Sulfur S: ≤ 0.025 (residual content) 
 Chromium Cr: ≤ 0.30 (residual content) 
 Nickel Ni: ≤ 0.30 (residual content) 
 Copper Cu: ≤ 0.25 (residual content) 
 Mechanical properties 
 Mechanical Properties]. 
 Sample blank size (mm): 25 
 Heat treatment: 
 First quenching temperature (° C): 820; coolant: Oil 
 Second quenching temperature (℃): - 
 Tempering the heating temperature (° C): 550; coolant: water, oil 
 Tensile strength (σb / MPa): ≧ 930 
 Yield point (σs of / MPa): ≧ 785 
 Elongation (δ5 /%): ≧ 9 
 Section shrinkage rate (ψ /%): ≧ 40 
 Absorbed energy (Aku2 / J): ≧ 39 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 22 
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