Cobalt Alloy 188/ Haynes Alloy 188/ Udimet 188


Technical Data Sheet

Chemical Composition Limits
Weight % C Mn Si P S Cr Ni W La B Fe Co
Alloy 188 0.05-0.15 1.25 max 0.20-0.50 0.02 max 0.015 max 20-24 20-24 13-16 0.02-0.12 0.015 3 max Bal

Haynes 188 / Udimet alloy 188 is a cobalt based nickel-chromium-tungsten alloy with a small addition of lanthanum to give a very protective scale. Alloy 188 combines excellent high-temperature strength with good resistance to both oxidizing environments up to 2000°F and to sulfate deposit hot corrosion. Alloy 188 has good forming characteristics and is capable of being forged, hot worked or cold worked, althoug it does work-harden very rapidly so frequent intermediate annealing treatments are recommend for complex forming operations. Alloy 188 is supplied solution heat treated at 2150°F and rapid air or water quenched to attain optimum properties. A combination of good fabricability and weldability makes Alloy 188 suitable for a wide number of applications, particularly in gas turbine components such as combustors, flame holders, liners and tranistion ducts.

Typical Mechanical Properties

Material Temp°F Yield Strength (0.2% Offset) min Tensile Strength min Elongation (%) Hardness
ksi MPa ksi MPa
Alloy 188 Extruded Bar
Solution Treated (AMS 5772)
RT 55 379 125 862 45

≤302HB


Material Temp°F Thickness
(Inches)
Yield Strength (0.2% Offset) min Tensile Strength min Elongation (%) Hardness HRC
ksi MPa ksi MPa
Alloy 188 Sheet
Solution Treated (AMS 5608)
RT ≤0.020" 55 379 125 862 40 -
Alloy 188 Sheet
Solution Treated (AMS 5608)
RT

≥0.020"

55 379 125 862 45 -
Alloy 188 Sheet
Solution Treated (AMS 5608)
1200 ≤0.020" 36 248 90 621 40 -
Alloy 188 Sheet
Solution Treated (AMS 5608)
1200 ≥0.020" 36 248 90 621 50 -

Availability
Alloy 188 is available in Sheet, Bar, Plate, Tube, Forgings Stock, Welding Wire. For all stock availability contact Sales.

Specifications
AMS 5608 Sheet, Strip and Plate
AMS 5772 Bars, Forgings and Rings
AMS 5801 Welding Wire
UNS R30188
GE B50A712
GE B50TF59
GE B50TF74
Trade Names: Haynes 188, UDIMET 188

Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.