Cobalt Alloy 188, also known as UNS R30188 and W. Nr. 2.4683, is a cobalt-nickel-chromium-tungsten alloy that combines excellent high-temperature strength with very good resistance to oxidizing environments up to 2000°F (1095°C) for prolonged exposures, and excellent resistance to sulfate deposit hot corrosion. It is commonly used in gas turbine engine components, such as combustor liners, flame holders, and transition ducts, due to its ability to withstand extreme temperatures and corrosive environments. This alloy is also utilized in various industrial applications where resistance to wear, corrosion, and thermal fatigue is required.
Whatsapp:
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sales@cocessalloys.comChemical Composition
|
Carbon (C) |
0.05-0.15 % |
|
Manganese (Mn) |
1.25 % max. |
|
Silicon (Si) |
0.20-0.50 % |
|
Chromium (Cr) |
20.0-24.0 % |
|
Nickel (Ni) |
20.0-24.0 % |
|
Tungsten (W) |
13.0-16.0 % |
|
Lanthanum (La) |
0.02-0.12 % |
|
Boron (B) |
0.015 % max. |
|
Iron (Fe) |
3.0 % max. |
|
Cobalt (Co) |
Balance |
Physical Properties
|
Density |
lb/in3 |
0.33 |
|
|
g/cm3 |
9.14 |
|
Melting Range |
°F |
2375-2425 |
|
|
°C |
1300-1330 |
|
Specific Heat at 70°F |
Btu/lb°F |
0.097 |
|
|
at21°C,J/kg°C |
405 |
|
Permeability at 200 oersted |
|
1.0007 |
|
Coefficient of Expansion |
0 - 200°F, 10-6 in/in•°F |
6.6 |
|
|
21 - 93°C, µm/m•°C |
11.9 |
|
Thermal Conductivity |
Btu•in/ft2•h•°F |
84 |
|
|
W/m•°C |
12.1 |
|
Electrical Resistivity |
ohm•circ mil/ft |
613 |
|
|
microhm-cm |
102 |
Mechanical Properties
|
Form |
Temperature |
Dimensions |
Yield Strength |
Tensile Strength |
Elongation A |
|||
|
mm |
in |
MPa |
ksi |
MPa |
ksi |
% |
||
|
Plate |
Room Temperature |
≤12.5 |
≤0.5 |
380 |
55 |
860 |
125 |
40 |
Cobalt Alloy 188, also known as Haynes 188, offers excellent high-temperature strength and oxidation resistance, making it suitable for various demanding applications. Some typical applications of Cobalt Alloy 188 include:
1. Gas Turbine Engine Components: It is commonly used in gas turbine engine components, such as combustion chambers, afterburner liners, and vanes, due to its exceptional resistance to high-temperature corrosion and oxidation.
2. Industrial Furnaces: Cobalt Alloy 188 finds applications in industrial furnaces and heat-treating equipment where resistance to high-temperature corrosion and thermal cycling is required.
3. Chemical Processing Equipment: It is utilized in the construction of chemical processing equipment, including reactors, piping systems, and valves, due to its resistance to corrosive environments and high temperatures.
4. Aerospace and Aeronautical Components: Cobalt Alloy 188 is employed in aerospace and aeronautical applications, such as in the manufacturing of aircraft components and propulsion systems.
5. Medical Applications: It finds use in the medical field for prosthetic implants, surgical instruments, and other medical devices that require high-temperature and corrosion resistance.
6. Power Generation: It is used in components for power generation systems, such as in the construction of industrial gas turbines and other high-temperature power generation equipment.
Specifications for Cobalt Alloy 188 include the following:
|
Sheet, plate, strip |
Billet, rod, bar |
Forgings |
Wire |
|
AMS 5608 |
AMS 5772 |
AMS 5772 |
AMS 5801 |
Standard product forms of Cobalt Alloy 188 are pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire. The products are available in a wide variety of sizes. Please contact us at sales@cocessalloys.com for full information.
