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AISI 4340 FORGED ALLOY STEEL BAR

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AISI 4340 FORGED ALLOY STEEL BAR

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4340 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.

AISI 4340 FORGED ALLOY STEEL BAR

AISI 4340 FORGED ALLOY STEEL BAR

4340 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

AISI 4340 FORGED ALLOY STEEL BAR Available Size

Forged steel round bar: dia100mm-dia1500mm

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

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

Available Heat Treatment

Annealing/Normalizing/Hardening/Tempering/Quenching

AISI 4340 FORGED ALLOY STEEL BAR 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.

AISI 4340 FORGED ALLOY STEEL BAR Application

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

Delivery Condition

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

 
 

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