188
Product Information
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Alloy 188 is a cobalt base superalloy with a unique combination of high temperature strength and oxidation resistance, along with adequate ductility after prolonged exposure to the 1400-1600°F temperature range.
Cobalt alloys have an inherent advantage over the nickel base grades in high temperature creep. Alloy 188 is solid solution strengthened by a 14% tungsten addition, and further by M6C and M23C6 carbides. Alloy 188 is readily fabricated, being welded by both manual and automatic methods including electron beam, gas tungsten arc and resistance welding.
Common Trade Names
Alloy 188, Haynes® 188
Inventory
Alloy 188 Sheet, Alloy 188 Coil, Alloy 188 Welding Products
Specifications
UNS R30188, Werkstoff 2.4683, Nr./EN 2.4683, AMS 5608, AMS 5801, PWA 1042
Chemical Composition, %
| Cr | Ni | Co | W | La | B | C | Fe | Mn | Si | P | S | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MIN | 20.0 | 20.0 | - | 13.0 | 0.02 | - | 0.05 | - | - | 0.2 | - | - |
| MAX | 24.0 | 24.0 | Balance | 16.0 | 0.12 | 0.015 | 0.015 | 3.0 | 1.25 | 0.5 | 0.02 | 0.015 |
Features
- Strength and oxidation resistant to 2000°F
- Good post-aging ductility
- Resistant to sulfate deposit hot corrosion
Applications
- Gas turbine engine combustor cans, spray bars, flame-holders and afterburner liners
Physical Properties
Density: 0.324 lb/in3
Melting Range: 2375 -2570°F
| Temperature, °F | 70 | 800 | 1000 | 1200 | 1400 | 1600 | 1800 |
| Coefficient* of Thermal Expansion, in/in°F x 10-6 | - | 7.8 | 8.2 | 8.6 | 9.0 | 9.4 | 9.9 |
| Thermal Conductivity Btu • ft/ft2 • hr • °F |
- | 10.4 | 11.5 | 12.7 | 13.9 | 14.5 | 15.8 |
| Modulus of Elasticity Dynamic, psi x 106 | 34 | 29 | 28 | 26 | 25 | 24 | 22 |
* 70°F to indicated temperature.
Mechanical Properties
Representative Tensile Properties, Sheet
| Temperature, °F | 70 | 1200 | 1400 | 1600 | 1800 | 2000 |
| Ultimate Tensile Strength, ksi | 137 | 103 | 90 | 60 | 35 | 19 |
| 0.2% Yield Strength, ksi | 67 | 40 | 39 | 36 | 19 | 9 |
| Elongation, % | 53 | 59 | 63 | 64 | 59 | 32 |
Typical Stress-Rupture Strength
| Temperature, °F | 1400 | 1500 | 1600 | 1700 | 1800 |
| 100 Hours, ksi | 32 | 22 | 14 | 9 | 5 |
| 1,000 Hours, ksi | 23 | 15 | 9 | 6 | 2 |
188 is a Trademark of Haynes International
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