AISI 4140

ASTM A29

Quenced Tempered (+QT)

PROPRIERTIES AND APPLICATIONS

AISI 4140, also known as SAE 4140 or 42CrMo4 in the European EN 10083 standard, is a versatile, medium-carbon, low-alloy steel renowned for its excellent strength, toughness, and wear resistance. AISI 4140 offers excellent tensile strength and good impact resistance, making it ideal for components under heavy loads. Its alloying elements enhance resistance to abrasion, extending the lifespan of components in high-wear environments.

Common Applications of AISI 4140:

Automotive and Aerospace Components: AISI 4140 is widely used in the automotive and aerospace industries for parts like crankshafts, axles, connecting rods, and landing gear components. Its high strength-to-weight ratio and fatigue resistance make it ideal for these high-stress applications.

Oil and Gas Industry: In the oil and gas sector, AISI 4140 is used for drill collars, tool joints, and other downhole components. Its ability to withstand high loads and resist wear in harsh environments, such as drilling operations, ensures reliability and longevity.

Heavy Machinery and Equipment: The steel is a common choice for manufacturing components in heavy machinery, including gears, sprockets, and shafts. Its toughness and wear resistance make it suitable for equipment used in construction, mining, and agriculture.

Fasteners and Bolts: AISI 4140 is often used to produce high-strength bolts, studs, and fasteners for applications requiring exceptional tensile strength, such as in bridges, pressure vessels, and industrial machinery.

Tooling and Dies: While not a traditional tool steel, AISI 4140 is sometimes used for forging dies, die holders, and other tooling components where moderate hardness and high toughness are required. Its ability to be heat-treated to a specific hardness makes it a cost-effective alternative to more expensive tool steels.

General Engineering: AISI 4140 is frequently used in general engineering for structural components like spindles, couplings, and hydraulic system parts, where its balanced properties ensure reliable performance under mechanical stress.

AISI 4140 is often compared to other medium-carbon alloy steels, such as AISI 4340 and AISI 4130. Compared to AISI 4340, which contains nickel for added toughness, AISI 4140 is less expensive and easier to machine but may not offer the same level of impact resistance in extreme conditions

CORRESPONDENCE TO INTERNATIONAL DESIGNATIONS

CHEMICAL ANALYSIS %

MECHANICAL CHARACTERISTICS

USUALLY AVAILABLE EX STOCK

M.T. COLORATION	QUALITY	HEAT TREATMENT	SURFACE	DIAMETER (mm)
	Aisi 4140	Quenched and tempered	rolled	30-300

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