Home » Hot Rolled Alloy Steel Bar » AISI 4340 HOT ROLLED ALLOY STEEL BAR
AISI 4340 HOT ROLLED ALLOY STEEL BAR

AISI 4340 HOT ROLLED ALLOY STEEL BAR

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.

Get Price Inquiry Now

facebook google twitter in youtube

AISI 4340 HOT ROLLED 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 HOT ROLLED ALLOY STEEL BAR

Available Size

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/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.

AISI 4340 HOT ROLLED 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

Hot rolled, black surface / brigth surface with customers’ required heat treatment