18CrNiMo7 Alloy Steel Round Bars

18CrNiMo7 is a chromium-nickel-molybdenum alloy steel known for its high strength, toughness, and hardenability.

18CrNiMo7 is a chromium-nickel-molybdenum alloy steel known for its high strength, toughness, and hardenability.

Chemical Composition:

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

• Tensile Strength: 1000 - 1200 MPa
• Yield Strength (0.2% offset): 800 - 1000 MPa
• Elongation: 11 - 14%
• Impact Toughness (Charpy V-notch): 30 - 40 J/cm²

Physical Properties:

• Density: Approximately 7.8 g/cm³
• Melting Point: Approximately 1400-1450°C (2552-2642°F)

Heat Treatment:

• Annealing: Heat to 800-850°C (1472-1562°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 870-920°C (1598-1688°F), air cool.
• Quenching: Oil quench from 830-860°C (1526-1580°F) or water quench from 820-850°C (1508-1562°F), followed by tempering.
• Tempering: Temper at a desired temperature depending on the desired properties. Typical tempering temperatures range from 550-650°C (1022-1202°F) for achieving a balance of strength and toughness.