Inconel 188 alloy Description:

Alloy 188 (UNS R30188) is a cobalt-based alloy which possesses a unique combination of properties. It has excellent high temperature strength and oxidation resistance to 2100°F (1150°C) combined with good post-aging ductility. Alloy 188 exhibits good ductility after prolonged exposure at temperatures of 1200, 1400, and 1600°F (650, 760 and 870°C) for 16,000 hours.

Chemistry Typical:

Nickel: 20.00-24.00
Chromium: 20.00-24.00
Tungsten: 13.00-16.00
Iron: 3.00 max
Cobalt: Balance
Lanthanum: 0.02-0.12
Boron: 0.015 max
Carbon: 0.05-0.15
Manganese: 1.25max
Silicon: 0.2-0.5
Phosphorus: 0.02 max
Sulfur: 0.015 max

Physical Properties:

Density: 0.324 lbs/in³, 8.98 g/cm³

Ultimate Tensile Strength: 130 KSI min (896 MPa min)

Yield Strength (0.2% offset): 60 KSI min (414 MPa min)

Elongation: 45% min
Hot Tensile 1200°F (Typical)

Ultimate Tensile Strength: 90 KSI min (620 MPa min)

Yield Strength (0.2% offset): 35 KSI min (243 MPa min):

Elongation:
Gauges up to 0.020 inches: 35% min
Gauges over 0.020 inches: 20% min