Alloy 188-Xi'an Aircraft Industry Titanium Industry Co., Ltd.

Cobalt Alloy 188/ Haynes Alloy 188/ Udimet 188

Technical Data Sheet

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.

Chemical Composition Limits

Weight %

Alloy 188

0.05-0.15

1.25 max

0.20-0.50

0.02 max

0.015 max

20-24

13-16

0.02-0.12

0.015

3 max

Bal

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
Material	Temp°F	Thickness (Inches)	ksi	MPa	ksi	MPa	Elongation (%)	Hardness HRC
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	-