AISI 4340 HOT ROLLED ALLOY STEEL BAR is a nickel-chromium-molybdenum alloy steel known for its toughness and its ability to attain high strengths in the heat-treated condition. It has very good fatigue resistance.
|Standard||Grade||Chemical composition (%)|
Hot rolled round bar: dia16mm-dia310mm
Hot rolled flat bar: thickness5mm-30mm, width50mm-130mm
Hot rolled square bar: 12mm*12mm-100mm*100mm
Available Heat Treatment
Annealing: AISI 4340 alloy steel is annealed at 844°C (1550°F) followed by cooling the furnace.
Tempering: AISI 4340 alloy steel should be in the heat treated or normalized and heat treated condition before tempering. Tempering temperatures depend upon the desired strength level.
Hardening: AISI 4340 alloy steel can be hardened by cold working or heat treatment.
Good toughness, high strengths in the heat-treated condition, very good fatigue resistance.
AISI 4340 alloy steel is mainly used in power transmission gears and shafts, aircraft landing gear, and other structural parts.
Hot rolled, black surface / brigth surface with customers’ required heat treatment