The Alloy 188 is a cobalt-based, solid-solution strengthened alloy that has excellent high temperature strength, excellent oxidation resistance up to 1093°, and good sulfidation resistance. This alloy also has good forming and welding characteristics, which make it useful in fabricating gas turbine components such as combustion cans and transition ducts.
Quken offers Alloy188 in following forms:
| Product form |
|---|
| Strip | Sheet | Plate | Bar | Wire | Forgings |
Designations and standards :
| Standard | Material designation |
|---|
| EN | 2.4683 - CoCr22NiW |
| UNS | R30188 |
Chemical composition %:
| | C | Mn | Si | P | S | Cr |
|---|
| MIN. | 0.05 |
| 0.20 | | | 20.00 |
| MAX. | 0.15 | 1.25 | 0.50 | 0.020 | 0.015 | 24.00 |
| | Ni | W | La | B | Fe | Co |
|---|
| MIN. | 20.00 | 13.00 | 0.02 |
|
| Balance |
| MAX. | 24.00 | 16.00 | 0.12 | 0.015 | 3.00 | Balance |
Physical Constants:
| Density | 0.330 lb/in3 (9.13 g/cm3) |
| Melting Range | 2375 - 2475 °F (1300 – 1355 °C) |
| Electrical Resistivity | 36.3 Ω⋅in ( 92.2 µΩ⋅cm) |
| Magnetic Permeability at 200 oersteds | 1.01 |
| Thermal Conductivity | 72 Btu⋅in/ft2 ⋅h⋅°F (10.4 W/m⋅K) |
| Specific Heat | 0.096 Btu/lb⋅°F (402 J/kg⋅°C) |
| Coefficient of Thermal Expansion, RT – 200°F | 6.7 × 10-6 in/in⋅°F (12.1 µm/m⋅°C) |
Mechanical Properties (RT):
| 0.2% Yield Strength | Tensile Strength | Elongation in 2 in. or 50 mm |
|---|
| KSI | MPa | KSI | MPa | % |
|---|
| 64 | 442 | 139 | 955 | 54 |
