Haynes 188 Plate, Sheet, Pipe, Bar

Haynes 188 is a cobalt based nickel-chromium-tungsten alloy with a small addition of lanthanum to give a very protective scale. Alloy 188 has combination of good fabricability and weldability which makes Alloy 188 suitable for a wide number of applications, particularly in gas turbine components such as combustors, flame holders, liners and tranistion ducts.

Haynes 188 Norminal Composition (wt %)

Haynes 188 Wrought Alloys Rupture Stress (Mpa)

Haynes 188 Heat-Treatment

Wrought forms of Haynes 188 are furnished in the solution heat-treated condition unless otherwise specified. Alloy 188 is normally solution heat-treated at 2150°F +/-25°F (1177°C +/-14°C) and rapid air cooled or water quenched. Haynes 188 bright annealed products are cooled in hydrogen.

Cold-Work and Aging of Haynes 188

Because of Haynes 188 relatively high strain hardening coefficient, Haynes 188 can be easily strengthened by cold deformation. Haynes 188 Strengthening is further enhanced by aging the cold-worked structure near 1000°F (540°C) for a period of 4 to 16 hours. This combination of treatments increases both the room and elevated tensile strength of Haynes 188 sheet. Cold working prior to aging significantly increases the rate of the aging reaction.

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