Inconel™ 738: Forging Facts & Characteristics

Inconel™ 738 offers a combination of outstanding high-heat creep-rupture strength and corrosion resistance better than many high-strength superalloys with lower chromium content. Inconel 738 is a nickel-based alloy, vacuum-cast and precipitation-hardened, offering exceptional mechanical properties to 1800°F (982°C). IN-738 holds up to the hot corrosive environments found in the turbine industry.

Chemical Composition of Inconel™738

  • Carbon 0.15-0.20
  • Cobalt 8.00-9.00
  • Chromium 15.70-16.30
  • Molybdenum 1.50-2.00
  • Tungsten 2.40-2.80
  • Tantalum 1.50-2.00
  • Columbium 0.60-1.10
  • Aluminum 3.20-3.70
  • Titanium 3.20-3.70
  • Aluminum and titanium 6.50-7.20
  • Boron 0.005-0.015
  • Zirconium 0.05-0.15
  • Iron 0.50 max
  • Manganese 0.20 max
  • Silicon 0.30 max
  • Sulfur 0.015 max
  • Nickel remainder

Heat Treatment of Inconel™738

  • 2050°F (1121°C) for 2 hours
  • Air cool
  • 1550°F (843°C) for 24 hours
  • Air cool

Applications of Inconel™ 738

  • Inconel 738 is most commonly used for gas turbine blades and vanes for industrial use.

Machinability of Inconel™ 738

  • Sturdy and short drills, reamers, taps and end mills
  • Positive feeds with no tool dwelling
  • High-speed tools in turning operations
  • Carbide tools for tapping, reaming and drilling
  • Lubricate continuously
    • Chemical  emulsions for turning
    • Chlorinated oil for tapping, reaming, drilling and milling
  • 6000 rpm wheel speed for surface grinding, using highly sulfurized oil
  • Normal finish grinding techniques

Corrosion Resistance of Inconel™ 738

  • Exceeds strong superalloys
  • Resists oxidation to 2000°F (1093°C)
  • Improved sulfidation resistance up  to 1800°F (982°C)
  • Demonstrated resistance atmospheres with hydrogen sulfide and sulfur dioxide to 1800°F (982°C)

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