Unified Digital Code: A10422 Standard: GB / T 3077-1999
[] Chemical composition (mass fraction) (%)
C: 0.39 ~ 0.45
Si: 1.10 ~ 1.40
Mn: 1.10 ~ 1.40
[] 42SiMn mechanical properties of alloy steel
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] is basically the same performance and 35SiMn steel, but its strength, wear resistance and hardenability were slightly higher, the hardenability of steel in the water critical diameter of 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 Example] 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. Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.
