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AISI 4140 / EN 19

AISI 4140, also known as EN 19, is a medium carbon steel alloy that is widely recognized for its combination of strength, toughness, and good hardenability. This steel grade is commonly used in a wide range of applications that require high strength and resistance to wear and fatigue. AISI 4140 is frequently employed in the automotive, aerospace, and manufacturing industries, especially for components subjected to high stresses and dynamic loading conditions. It is often supplied in the quenched and tempered condition for enhanced mechanical properties.

Steel Properties

AISI 4140 offers excellent strength and toughness, even in demanding conditions. It has good hardenability, allowing it to be heat-treated to high strength levels. When properly heat-treated, it achieves a tensile strength of up to 1000 MPa (145,000 psi), making it suitable for high-stress applications. The steel's chromium content enhances its resistance to wear, while the molybdenum increases its ability to withstand high-temperature environments. AISI 4140 is known for its good fatigue and impact resistance, which makes it an ideal choice for parts subjected to cyclic loading. Additionally, it has good machinability in its annealed state and can be easily welded when proper procedures are followed.

Application

AISI 4140 is used in a wide variety of applications, including automotive components (e.g., crankshafts, axles, gears, and spindles), heavy machinery parts (e.g., shafts, rods, and bolts), and aerospace components. It is also used in the production of industrial tooling, including dies, drills, and cutters. Its versatility makes it a preferred choice for many industries requiring strong, durable components that must withstand high stress, fatigue, and wear. The ability to be heat-treated and achieve various mechanical properties allows AISI 4140 to be used in applications ranging from structural to highly demanding, high-performance uses.