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18CrNiMo7-6 Alloy Steel Round Bars Manufacturers, Suppliers, Importers, Dealers in Mumbai India

18CrNiMo7-6 Alloy Steel Round Bars

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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:

PropertyMinimum ValueMaximum Value
Chemical Composition (%)  
Carbon (C)0.770.85
Silicon (Si)0.150.35
Manganese (Mn)0.400.70
Phosphorus (P)-0.025
Sulfur (S)-0.035
Chromium (Cr)1.701.95
Nickel (Ni)1.401.70
Molybdenum (Mo)0.150.25

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.

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