Cobalt L-605 alloy, also known as Haynes 25, is a superalloy known for its exceptional strength, durability, and resistance to extreme temperatures and corrosion. The alloy was used in the 1950s and quickly became a sought-after material for high-performance aerospace and power generation applications. This blog explores the composition, physical and mechanical properties, uses, hardness, heat treatment, welding and corrosion resistance of Cobalt L-605 alloy.
L-605 alloy chemical composition:
Cobalt L-605 is a non-magnetic nickel-based high-temperature alloy containing a combination of cobalt (50%), chromium (20-22%), tungsten (15-17%), nickel (10%) and other elements, iron (3-10%) and manganese (<1%). The alloy is known for its excellent high-temperature strength, resistance to wear and other mechanical stresses in hot, harsh environments.
Cobalt: balance
Chrome: 19,00 – 21,00
Tungsten: 14,00 – 16,00
Nickel: 9,00 – 11,00
Iron: Max 3,00
Manganese: 1,00 – 1,20
Silicon: Maximum 0,40
C: 0,05 – 0,15
Phosphorus: Maximum. 0,04
S: To the maximum extent. 0,03
L-605 alloy physical properties:
Cobalt L-605 has a density of 9.17 g/cm3 and exhibits excellent high temperature strength and oxidation resistance at temperatures up to 982°C. When exposed to high temperatures, Cobalt L-605 forms a stable oxide layer that prevents further oxidation, making it suitable for use in gas turbine engines, rocket nozzles, and chemical processing plants. Cobalt L-605′s high thermal stability and low coefficient of thermal expansion further enhance its high temperature performance.
Density 9.27 g/cm3
Melting point 1330 – 1410℃
Thermal conductivity 9.4 W/m·°C
Expansion coefficient at 21 – 93°C 13 microns/m·℃
The mechanical properties of L-605 cobalt alloy are impressive. It has high yield strength (550-670 MPa), ultimate tensile strength (760-900 MPa) and elongation at yield (20-35%). Cobalt L-605 has a high thermal expansion coefficient of 13.9 µm/m/°C and a Poisson’s ratio of 0.31. It also exhibits excellent fatigue resistance, allowing it to withstand repeated stresses and strains that could cause weaker alloys to fracture.
Yield strength: 460 MPa
Tensile strength: 1000 MPa
L-605 alloy uses:
L-605 cobalt alloy is widely used in various industries, including gas turbine engines, critical aerospace engine components, gas turbine combustors, land-based industrial gas turbines, nuclear power systems and chemical process equipment. The alloy’s excellent high-temperature corrosion resistance makes it the first choice for applications in highly corrosive environments and extreme temperature ranges.
L-605 alloy hardness:
Haynes 25 alloy is known for its high hardness, which contributes to its excellent high temperature performance and corrosion resistance. The alloy has a Rockwell hardness of C40 and has excellent machining properties, making it easier to produce complex parts required for industrial applications.
L-605 alloy heat treatment:
Cobalt L-605 alloy can be heated for approximately 1 hour per inch of thickness at temperatures from 1095°C to 1120°C and then cooled in air or oil. This heat treatment process helps relieve stress and anneal the alloy, maintaining its mechanical properties and helping to relieve internal stresses.
L-605 alloy welding:
Because Cobalt L-605 alloy has a low carbon content and is prone to hot cracking, careful consideration is required when welding. However, this material can be welded using gas tungsten arc welding, shielded metal arc welding and gas metal arc welding techniques. As with other welding processes, post-weld heat treatment may be required to ensure that the welded material maintains its mechanical properties.
L-605 alloy corrosion resistance:
One of the most significant advantages of L-605 cobalt alloy is its excellent corrosion resistance. The alloy’s chromium content forms a protective oxide layer that helps prevent further oxidation, and its nickel content provides excellent resistance to corrosion and pitting in corrosive environments. L-605 cobalt alloy is resistant to a wide range of acids. It has excellent resistance to intergranular corrosion and is ideal for use in corrosive and high temperature conditions.
in conclusion:
In summary, Cobalt L-605 alloy is an impressive superalloy known for its excellent high-temperature strength, durability, and resistance to extreme temperatures and corrosion. Its unique composition provides ideal mechanical properties for high-performance applications in various industries. The high temperature, hardness and corrosion resistance make it the perfect material for harsh environments that require a strong and reliable material. When it comes to L-605 Cobalt Alloy, it’s clear that it is an invaluable material for numerous industries.
Tianjin Anton Metal Manufacture Co., Ltd. is a company specializing in the production of various nickel-based alloys, Hastelloy alloys and high-temperature alloy materials. The company was established in 1989 with a registered capital of 10.0 million, specializing in the production and sales of alloy materials. Anton Metal’s products are widely used in aerospace, chemical industry, electric power, automobile, nuclear energy and other fields, and can also provide customized alloy material solutions according to customer needs. If you need to know the price consultation of alloy materials or provide customized alloy material solutions, please feel free to contact the sales staff.
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Post time: Jan-04-2024
