Alloy structure steel 4340 has high strength, high toughness and good hardenability. When hardened reaches half martensite hardness (HRC45), water quenching critical quenching diameter for Φ ≥100mm, critical quenching oil quenching diameter for Φ ≥75mm; when hardened to 90% martensite, water quenched critical diameter for Φ 80 ~ 90mm, oil quenched critical diameter for Φ 55 ~ 66mm. AISI 4340 alloy steel has anti-overheating and stability, but the white spot high sensitivity, temper brittleness, poor welding, high temperature preheating before welding, eliminate stress after welding.
The main purpose of alloy structure steel 4340: manufacture of turbine gears, gear ring, the whole forging rotor. Engine connecting rods, valve. High strength, high toughness, a greater cross-sectional size forgings such as forged part of wind generator, drive eccentric shaft of horizontal type forging machine, crankshaft of forging machine etc.. Automobile, airplane special wear-resistant parts etc..
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