AISI 4140

AISI 4140 is a high-performance alloy steel known for its excellent strength and toughness. It is often used in applications that require high strength and wear resistance.

Chemical Composition

- Carbon (C): 0.36% - 0.44%

- Manganese (Mn): 0.50% - 0.80%

- Silicon (Si): 0.15% - 0.40%

- Chromium (Cr): 0.90% - 1.20%

- Nickel (Ni): 1.30% - 1.70%

- Molybdenum (Mo): 0.15% - 0.25%

- Phosphorus (P): ≤ 0.035%

- Sulfur (S): ≤ 0.035%

Mechanical Properties

- Tensile Strength: 850 - 1000 MPa

- Yield Strength: 650 - 900 MPa

- Elongation: 10% - 15%

- Hardness: 28 - 34 HRC (after heat treatment)

Heat Treatment

- Hardening: Quenching in oil or water after heating to 800-850°C.

- Tempering: Followed by tempering at 500-600°C to achieve desired toughness and reduce brittleness.

Applications

- Gears

- Shafts

- High-strength bolts

- Machine components

- Automotive parts

Characteristics

- High wear resistance

- Good machinability

- Excellent toughness

- Suitable for heavy-duty applications

4140 is an excellent choice for applications demanding high strength and toughness, making it a popular choice in engineering and manufacturing sectors.