Inconel™ W

General Characteristics of Inconel™ W

Inconel W achieves its maximum properties through age-hardening heat treatment. It’s a nickel-based alloy that offers outstanding heat, oxidation and corrosion resistance. A frequent option to Inconel  X, Inconel W offers good stress-rupture and creep attributes.

Chemical Composition of Inconel™ W

• Carbon 0.08 max
• Manganese 1.0 max
• Silicon 0.7 max
• Titanium 2.0-2.75
• Aluminum 0.4-1.0
• Chromium 14.0-17.0
• Iron 5.0-9.0
• Nickel 70.0

Heat Treatment of Inconel™ W

• Sulfur-free atmosphere for all treatments:
  • Anneal – maintain between 1950° and 2000°F (1066° to 1093°C) for 20 minutes to 1 hour, then rapid cool
  • Stress equalization – hold at 1600° to 1650°F (871° to 899°C) for 24 hours; rapid air cooling
  • Aging – hold at 1300°F (704°C) for 16-20 hours; air cool

Applications of Inconel™ W

• Springs up to 1000°F (538°C)
• High temperature parts
  • Bolts
  • Forming tools
  • Blades
  • Vanes
  • Turbine rotor wheels
• Gas turbines
• Heat engines

Machinability of Inconel™ W

• Compares favorably to annealed high-speed steels
• High-speed steel turning tools
  • 25-35 sfpm (solution-annealed material)
  • Above 10-20 sfpm (age-hardened material)
• Cobalt high-speed steel – feeds of 0.015”/rev.; depth less than 3/32”
• Nonferrous cutting tools – 40 sfpm;  feeds of 0.015-0.025”/rev; depth to ¼”
• Age-hardened materials
  • Carbide tools
  • Up  to 60sfpm
  • Feeds of 0.008-0.018”/rev.;  depth up to 3/16”
• High-speed steel  and cast nonferrous tools
  • Grind to 4-5° front and side; 0-8° back rake; 8-15° side rake; 15-25° side cutting edge angle; 10-20° end cutting-edge angle; 1/32”-3/32” nose radius
• Carbide tip – same angles, but 1/32” maximum nose radius
• Chip breakers recommended

Workability of Inconel™ W

• Easily forged from 2225° to 1900° F (1218°to 1038°C)
• Heat in atmosphere free from sulfur
• Avoid hot-cold-work

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