Haynes® 25
Haynes 25 (L605) is a cobalt-nickel-chromium-tungsten alloy that combines excellent high-temperature strength with good oxidation resistance up to 1800°F (980°C). It is the strongest of the fabricable cobalt alloys and offers superior resistance to sulfidation and metal galling.
- Common Forms: Sheet, Strip, Bar, Wire.
- Key Feature: High strength + Galling Resistance.
- Environment: Excellent in sulfur-containing atmospheres.
- Fabrication: Good formability and weldability.
Haynes 25 is the preferred material for gas turbine parts and industrial furnace components where both high heat and wear are present. Its cobalt base makes it inherently more resistant to galling (surface damage caused by sliding friction) than nickel-based alloys, making it ideal for bearings and seal rings.
Wear & Galling Resistance
The cobalt matrix provides exceptional resistance to wear and seizing, crucial for components that rotate or slide against each other at high temperatures.
High Temperature Strength
Retains high tensile and creep strength at temperatures up to 1800°F, outperforming many stainless steels and nickel alloys.
Sulfidation Resistance
Excellent resistance to hot corrosion in atmospheres containing sulfur, marine salts, and other harsh contaminants.
| Element | Content (%) |
|---|---|
| Cobalt (Co) | 50.0 min (Balance) |
| Chromium (Cr) | 19.0 - 21.0 |
| Tungsten (W) | 14.0 - 16.0 |
| Nickel (Ni) | 9.0 - 11.0 |
| Iron (Fe) | 3.0 max |
| Manganese (Mn) | 1.0 - 2.0 |
| Carbon (C) | 0.05 - 0.15 |
*Note: The high Tungsten content contributes significantly to its solid-solution strengthening.
| Product Form | Standards (AMS) |
|---|---|
| Bar, Forgings, Rings | AMS 5759 |
| Sheet, Strip, Plate | AMS 5537 |
| Wire | AMS 5796 |
| Property | Typical Values (Room Temp) |
|---|---|
| Tensile Strength | 145 - 160 ksi (1000 - 1100 MPa) |
| Yield Strength (0.2% Offset) | 65 - 80 ksi (450 - 550 MPa) |
| Elongation | 30 - 50 % |
| Hardness (Rockwell C) | 20 - 25 HRC (Annealed) |
Gas Turbines
Combustion chambers, afterburner parts, turbine rings, and blades.
Bearings & Bushings
Ball bearings and races requiring high temperature wear resistance.
Industrial Furnaces
High-temperature muffles, kiln liners, and conveyor belts.
Medical Implants
Occasionally used in specialized surgical implants due to biocompatibility and strength (ASTM F90).
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