Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 35Mn2 alloy structural steel / 35Mn2 steel plate / 35Mn2 steel bars / 35Mn2 coil / 35Mn2 strip / 35Mn2 steel pipe / 35Mn2 wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 35Mn2, alloy structural steel. 
 Standard: GB / T 3077-1999 
 The main characteristics of 
 Cold deformation of the plastic medium, the machinability is acceptable but poor weldability. 30Mn2 steel, high carbon content, with higher strength, wear resistance and hardenability sexual critical hardenability diameter 7.5 ~ 20mm in oil, but the plastic is slightly lower, and the sensitivity of the white point overheating and tendency to temper brittleness, easy to form a tendency to crack when the water quenching. 
 [Application Examples] 
 Generally used in the quenched and tempered or normalized state can be used as a connecting rod, spindle, axle, crank, cold heading bolts stress requirements for heavy and medium-sized machinery, mechanical parts; in agricultural machinery, The shovel can be used as a hoe, hoe shovel handle wear parts; in the manufacture of small cross section (diameter <20mm) parts instead of 40Cr steel. 
 Chemical composition 
 Chemical composition (mass fraction) (%) 
 Carbon C: 0.32 ~ 0.39 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 1.40 ~ 1.80 
 Phosphorus P: "0.025 
 SS: "0.025 
 Chromium Cr: "0.30 
 Nickel Ni: 0.30 
 Copper Cu "0.25 
 Mechanical properties 
 Mechanical Properties]. 
 Sample blank size (mm): 25 
 Heat treatment: 
 First quenching temperature (° C): 840; coolant: water 
 Second quenching temperature (℃): - 
 Tempering the heating temperature (° C): 500; coolant: water 
 Tensile strength (σb / MPa): ≧ 835 
 Yield point (σs of / MPa): ≧ 685 
 Elongation (δ5 /%): ≧ 12 
 Section shrinkage rate (ψ /%): ≧ 45 
 Absorbed energy (Aku2 / J): ≧ 55 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 207 
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