MP35N: A High-Performance Nickel-Cobalt-Chromium-Molybdenum Alloy

MP35N is a high-performance nickel-cobalt-chromium-molybdenum alloy known for its high strength, excellent ductility and toughness, superior corrosion resistance, and non-magnetic properties.

Its chemical composition mainly includes:

• Nickel (Ni): 33-37%

• Cobalt (Co): ~33%

• Chromium (Cr): 19-21%

• Molybdenum (Mo): 9-10.5%

Additionally, it contains small amounts of carbon, manganese, phosphorus, silicon, titanium, boron, and iron, which contribute to its unique combination of properties, ensuring high performance and stability in extreme environments.

Physical Properties

• Strength: MP35N has a yield strength of up to 300 ksi (2068 MPa) and tensile strength of up to 285 ksi (1965 MPa).

• Toughness: The alloy exhibits excellent ductility and toughness, maintaining strong mechanical performance under extreme conditions.

• Corrosion Resistance: MP35N is highly resistant to most mineral acids, hydrogen sulfide, seawater, and salt spray environments, as well as stress corrosion, crevice corrosion, and hydrogen embrittlement.

• High-Temperature Resistance: The alloy can operate at temperatures up to 400°C (752°F) while maintaining stable performance.

Applications

Due to its unique combination of properties, MP35N is widely used in various industries:

• Aerospace: Used for engine components, spacecraft structures, and other parts requiring high performance and stability in extreme environments.

• Medical Devices: Ideal for surgical instruments and implants, thanks to its corrosion resistance and non-magnetic properties.

• Marine Engineering: Applied in subsea pipelines, deep-sea connectors, and other components exposed to corrosive seawater environments.

• Chemical Industry: Used in corrosion-resistant components for chemical processing equipment, as well as in the production of heparin, nitrosoamide, and other chemicals.

Manufacturing and Processing

MP35N is primarily produced using Vacuum Induction Melting (VIM) and Vacuum Arc Remelting (VAR) technologies, ensuring high purity and uniform composition.

During processing, cold drawing and cold rolling techniques are commonly used to enhance the alloy’s strength. Additionally, aging treatments can be applied to further improve mechanical properties.