Haynes 188

Haynes 188 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 has average room temperature tensile properties in the bright
annealed condition of 137.2 ksi (946 MPa) ultimate strength, 67.3 ksi
(464 MPa) yield strength and 53% elongation. At 1800°F (980°C) the
alloy has ultimate and yield strengths of 35.2 ksi (243 MPa) and 19.0
ksi (131 MPa), respectively, with 59% elongation. Cryogenic
temperatures do not significantly affect the ductility of alloy 188, but
strength levels are increased markedly.

The excellent oxidation resistance of Haynes 188 results from minute
additions of lanthanum, which modifies the protective oxide scale in
such a manner that the oxide becomes extremely tenacious and
retards diffusion when exposed to temperatures through 2100°F
(1150°C).

Haynes 188 exhibits good ductility after prolonged exposure at
temperatures of 1200, 1400, and 1600°F (650, 760 and 870°C) for
16,000 hours.

Specifications:
UNS R30188

Sheet, Strip, Plate
AMS 5608

Bar, Ring, Forgings
AMS 5772

Available Product Forms: Pipe, tube, sheet, strip, plate, round bar, flat
bar, forging stock.
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