A cobalt-chromium-nickel-tungsten superalloy, Alloy L605/25 is engineered for oxidation resistance, thermal stability and is one of the strongest cobalt alloys.
Alloy L605/25, also known as L605 cobalt alloy or UNS R30605, is a high-strength, solid-solution strengthened superalloy. Designed for exceptional performance in oxidising and high-temperature environments, it combines cobalt, chromium, nickel, and tungsten to offer an outstanding balance of thermal stability, wear resistance, and mechanical strength.
Its resistance to scaling, oxidation (up to 1093°C), and sulphidation makes it a material of choice in aerospace and other thermally extreme sectors. In addition, it resists galling and abrasive wear, ensuring durability in mechanical assemblies and high-friction components.
We stock L605 alloy in a variety of product forms to suit different applications and fabrication methods, including plate, round bar, sheet, and welding wire. To view available sizes and submit an enquiry, use the dropdown selector below.
The composition of Alloy L605/25 delivers high-temperature resilience and superior corrosion and oxidation resistance.
| % | Cr | Ni | Co | W | C | Fe | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|---|
| Min | 19 | 9 | - | 14 | 0.05 | - | 1 | - | - | |
| Max | 21 | 11 | Balance | 16 | 0.15 | 3 | 2 | 0.4 | 0.04 | 0.03 |
L605 cobalt chromium alloy offers a unique combination of oxidation resistance, mechanical strength, and fabricability. The following properties make it well-suited for high-performance industrial use:
Known for its outstanding thermal stability, oxidation resistance, and mechanical strength, Alloy L605/25 is one of the strongest commercially available cobalt alloys. It is a preferred choice for aerospace and industrial sectors seeking long-term reliability under intense thermal cycling.
The alloy can be welded using GTAW, GMAW, SMAW, EBW, and resistance techniques. Optimal welding practices include:
For technical advice or to explore pricing and availability, get in touch with the NeoNickel team or fill in our online enquiry form and we’ll get right back to you!
| Mechanical & Physical Properties | 21°C | 427°C | 538°C | 649°C | 760°C | 816°C | 871°C | 927°C | 982°C |
|---|---|---|---|---|---|---|---|---|---|
| Coefficient of Thermal Expansion µm/m⁰C | - | 14 | 14.4 | 14.8 | 15.5 | - | 16.4 | - | 16.9 |
| Thermal Conductivity /kcal/(hr.m.°C) | - | 14.9 | 16.7 | 18.6 | 20.4 | - | 22.6 | - | 24.8 |
| Modulus of Elasticity/ x105 MPa | 2.28 | 1.93 | 1.86 | 1.79 | 1.65 | - | 1.59 | - | 1.45 |
| Ultimate Tensile Strength /Mpa | 1006.6 | - | - | 744.6 | 641.2 | - | 413.7 | - | 234.4 |
| 0.2% Yield Strength /MPa | 475.7 | - | - | 331 | 282.7 | - | 248.2 | - | 124.1 |
| Elongation/ % | 51 | - | - | 60 | 42 | - | 45 | - | 32 |
| 100 hr Rupture Strength/ Mpa | - | - | - | 475.7 | 248.2 | 172.4 | 124.1 | 82.7 | 48.3 |
| 1000 hr Rupture Strength/ Mpa | - | - | - | 393 | 179.3 | 124.1 | 82.7 | 48.3 | 27.6 |
Thanks to its exceptional performance under thermal and mechanical stress, Alloy L605/25 is widely used in aerospace and industrial applications involving oxidation, friction, and thermal fatigue.
Its superior mechanical integrity, even in prolonged high-heat exposure, makes Alloy L605 a trusted solution for high-risk, high-stress environments.
L605 is a cobalt-chromium-nickel alloy with tungsten, manganese, and other elements. Its high cobalt and chromium content provide excellent strength and corrosion resistance at high temperatures.
It is used in gas turbines, combustion chambers, bearings, and furnace parts—anywhere strength and oxidation resistance are critical.
No, Alloy L605 is non-magnetic, making it suitable for sensitive applications where magnetic interference must be avoided.
L605 is one of the strongest cobalt alloys available, offering better high-temperature strength and wear resistance than many alternatives.
Looking for a trusted supplier of Alloy L605/25? NeoNickel provides extensive stock across Europe, fast turnaround, and technical expertise for high-temperature alloy projects. Add a product to your enquiry basket or contact our specialists for tailored support.
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