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AISI 4340 FORGED ALLOY STEEL BAR

low hardenability C60 BARS for automobile rear

AISI 4340 FORGED 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.

Similar Grades

Standard Grade Chemical composition (%)
C Si Mn Cr Ni Mo P S

 

GB 40CrNiMoA 0.37-0.44 0.17-0.37 0.50-0.80 0.60-0.90 1.25-1.65 0.15-0.25 ≤0.035 ≤0.035
AISI 4340 0.38-0.43 0.15-0.35 0.60-0.80 0.70-0.90 1.65-2.00 0.20-0.30 ≤0.035 ≤0.040
JIS SNCM439 0.36-0.43 0.15-0.35 0.60-0.90 0.60-1.00 1.60-2.00 0.15-0.30 ≤0.030 ≤0.030

Available Size

Forged steel round bar: dia100mm-dia1500mm

Forged flat bar: thickness20mm-400mm, width80mm-1000mm

Forged steel block: 100mm*100mm-1000mm*1000mm

AISI 4340 FORGED ALLOY STEEL BAR

Available Heat Treatment

Annealing/Normalizing/Hardening/Tempering/Quenching

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.

Characteristics

Good toughness, high strengths in the heat-treated condition, very good fatigue resistance.

Application

AISI 4340 alloy steel is mainly used in power transmission gears and shafts, aircraft landing gear, and other structural parts.

AISI 4340 FORGED ALLOY STEEL BAR

Delivery Condition

Forged, black surface/ machined surface with customers’ required heat treatment

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