20MnCr5 Alloy Steel Round Bars

20MnCr5 alloy steel round bars are commonly used in various applications such as gears, shafts, and components requiring good combination of hardness and toughness.

20MnCr5 is a versatile alloy steel known for its good hardenability, strength, and toughness.

Chemical Composition:

Mechanical Properties (Typical values for quenched and tempered condition):

• Tensile Strength: 600 - 900 MPa
• Yield Strength (0.2% offset): 350 - 600 MPa
• Elongation: 11 - 21%
• Impact Toughness (Charpy V-notch): 30 - 40 J/cm²

Physical Properties:

• Density: Approximately 7.85 g/cm³
• Melting Point: Approximately 1450°C (2642°F)

Heat Treatment:

• Annealing: Heat to 850-880°C (1562-1616°F), furnace cool at a rate not exceeding 30°C (54°F) per hour to 650°C (1202°F), then cool in air.
• Normalizing: Heat to 850-890°C (1562-1634°F), air cool.
• Quenching: Oil quench from 840-860°C (1544-1580°F) or water quench from 820-840°C (1508-1544°F), followed by tempering.
• Tempering: Temper at a desired temperature depending on the desired properties. Typical tempering temperatures range from 150-250°C (302-482°F) for achieving a balance of strength and toughness.