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 % | 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 |
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