Good translation Metal Products (Shanghai) alloy structural steel companies (domestic alloy steel / alloy steel imports) 42simn alloy structural steel / 42simn steel / 42simn steel bar / 42simn Coil / 42simn steel / 42simn pipe / 42simn wire (good Translation Metal Products (Shanghai) Co., Ltd.) 
 42SiMn 
 42SiMn, alloy structural steel. Unified digital code: A10422 
 [] Chemical composition (mass fraction) (%) 
 C: 0.39 ~ 0.45 
 Si: 1.10 ~ 1.40 
 Mn: 1.10 ~ 1.40 
 [Mechanical properties] 
 Blank sample size (mm): 25 
 Heat treatment: 
 The first quenching temperature (℃): 880; coolant: water 
 Second quenching temperature (℃): - 
 Tempering heating temperature (℃): 590; coolant: water 
 Tensile strength (σb / MPa): ≧ 885 
 Yield point (σs / MPa): ≧ 735 
 Elongation (δ5 /%): ≧ 15 
 Reduction of (ψ /%): ≧ 40 
 Impact absorbed energy (Aku2 / J): ≧ 47 
 Brinell hardness (HBS100/3000) (annealing or tempering condition): ≦ 229 
 [Main features] 
 Basically the same performance and 35SiMn steel, but its strength, wear resistance and hardenability were slightly higher in the water critical hardenability of steel diameter 27.5 ~ 50mm; critical in oil quenching diameter 13 ~ 30mm. The steel under certain conditions, strength, wear resistance and thermal processing are better than 40Cr steel, deformation resistance and the oxide formation is similar to 40Cr steel. 
 [Application Examples] 
 This steel is mainly used for surface hardening of steel. In the high-frequency quenching and tempering temperature conditions for the manufacture of medium speed and medium load of gear parts; quenched after the high-frequency quenching, tempering state, requirements for the manufacture of high surface hardness, high wear resistance larger cross-section parts, such as spindle, shaft, gear and so on. Can also be low after quenching, tempering temperature conditions for the production of medium-speed, high load of parts such as gears, shaft, pump rotors, sliders and so on. This steel also can replace 40CrNi steel. 
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