Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 40Mn2 alloy structural steel / 40Mn2 steel plate / 40Mn2 steel bars / 40Mn2 coil / 40Mn2 strip / 40Mn2 steel pipe / 40Mn2 wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 40Mn2, alloy structural steel. 
 Standard: GB / T 3077-1999 
 The main characteristics of 
 This is a carbon quenched and tempered manganese steels are high strength, ductility and wear resistance of steel, good machinability and heat treatment process performance, critical hardenability diameter 8.5 ~ 23mm in oil, the critical quenching in water through a 20 ~ 42mm in diameter; but there is a temper brittleness and thermal sensitivity, easy to crack and quenching. This steel has a sensitivity of white spots, cold deformation of the plastic is not high, poor welding, and the need to preheat to 100 ~ 425 ℃ before welding. 
 [Application Examples] 
 Generally used in the quenched and tempered condition, the parts can be used to manufacture heavy-duty conditions, such as shafts, crankshafts, axles, piston rods, worm, lever, rod, load bolts, screws, reinforcement rings, springs and other tune quality pieces. Is generally used when the diameter is less than 50mm important parts of the small cross section, the static strength and fatigue properties of this steel and to 40Cr steel, it can be used for the generation of steel 40Cr. 
 Chemical composition 
 Chemical composition (mass fraction) (%) 
 Carbon C: 0.35 ~ 0.45 
 Silicon Si: 0.20 ~ 0.40 Mn of Mn: 1.60 ~ 1.80 
 Phosphorus P: "0.030 (residual content) 
 Sulfur S: "0.030 (residual content) 
 Chromium Cr: ≤ 0.309 (residual content) Ni - Ni: ≤ 0.30 (residual content) 
 Copper Cu: ≤ 0.25 (residual content) 
 Mechanical Properties]. 
 Sample blank size (mm): 25 
 Heat treatment: 
 First quenching temperature (° C): 840; coolant: water, oil 
 Second quenching temperature (℃): - 
 Tempering the heating temperature (° C): 540; coolant: water 
 Tensile strength (σb / MPa): ≧ 885 
 Yield point (σs of / MPa): ≧ 735 
 Elongation (δ5 /%): ≧ 12 
 Section shrinkage rate (ψ /%): ≧ 45 
 Absorbed energy (Aku2 / J): ≧ 55 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 217 
 Delivery status: to heat treatment (normalizing, annealing, or high-temperature tempering) or heat treatment state of delivery, the delivery status should be indicated in the contract. 
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