AISI 4140 is a versatile chromium-molybdenum alloy steel with excellent hardenability and comprehensive mechanical properties. It features high tensile strength, good toughness, outstanding wear resistance and fatigue strength after quenching and tempering heat treatment. With stable mechanical performance and easy machining, it is widely used for gears, shafts, bolts, hydraulic parts, machinery structural components and high-load industrial parts.

Advantage

1.Excellent hardenability, uniform hardness and strength after heat treatment 2.High toughness and impact resistance, suitable for heavy-load dynamic working conditions 3.Great wear resistance and fatigue strength for long-term mechanical operation 4.Fine machinability and stable dimensional performance for various precision processing

Ingredient

• C
• 0.38 ~ 0.43
• Cr
• 0.80 ~ 1.10
• Mo
• 0.15 ~ 0.25
• Mn
• 0.75 ~ 1.00
• Si
• 0.15 ~ 0.35
• P
• ≤0.035
• S
• ≤0.040
• Fe
• Balance

Standard

• USA
• ASTM A519 / AISI 4140
• China
• GB/T 8162‑2018、GB/T 8163‑2018

Mechanics

• STATE
• RP
• YIELD
• EXTEND
• SHRINK
• HARDNESS
• IMPACT
• Annealed
• ≥1020 MPa
• ≥860 MPa
• ≥12 %
• ≥40 %
• ≤321 HBW
• ≥20 J
• Annealed
• ≥980 MPa
• ≥820 MPa
• ≥12 %
• ≥40 %
• ≤321 HBW
• ≥20 J

• STATE
• Annealed
• RP
• ≥1020 MPa
• YIELD
• ≥860 MPa
• EXTEND
• ≥12 %
• SHRINK
• ≥40 %
• HARDNESS
• ≤321 HBW
• IMPACT
• ≥20 J
• STATE
• Annealed
• RP
• ≥980 MPa
• YIELD
• ≥820 MPa
• EXTEND
• ≥12 %
• SHRINK
• ≥40 %
• HARDNESS
• ≤321 HBW
• IMPACT
• ≥20 J