ThePipingMart Blog Grades MP35N Cobalt Alloy (UNS R30035)- Composition, Properties and Uses

MP35N Cobalt Alloy (UNS R30035)- Composition, Properties and Uses

MP35N Cobalt Alloy (UNS R30035)

Mp35n cobalt alloy is a nickel-cobalt-chromium-molybdenum alloy with high strength, good ductility, and excellent corrosion resistance. It was developed in the 1970s as a response to the limitations of existing alloys such as Inconel. Today, it is one of the most sought-after alloys used in several industries due to its unique properties. This blog post will closely examine mp35n cobalt alloy composition, mechanical and physical properties, and its various uses in different industries.

MP35N Cobalt Alloy Composition

mp35n Cobalt alloy is a high-performance alloy that contains cobalt, nickel, chromium, and molybdenum. It also features smaller amounts of titanium, iron, manganese, carbon, silicon, and phosphorus. The combination of these materials gives mp35n cobalt alloy its superior properties, making it highly resistant to corrosion, high temperatures, and extreme environments.

Chemical Composition Limits
Weight % Ni Co Cr Mo Ti Fe Si Mn P B S C
MP35N® 33-37 Bal 19-21 9-10.5 1 max 1 max 0.15 max 0.15 max 0.015 max 0.010 max 0.010 max 0.03 max
MP35N® is a registered trademark of SPS Technologies Inc.

MP35N Cobalt Alloy Mechanical Properties

Mp35n Cobalt alloy has excellent mechanical properties, making it useful in many applications. It has high tensile strength and good ductility, which means it can resist deformation and withstand high stress and strain without breaking. Its tensile strength ranges from 1470 MPa (megapascals) to 1930 MPa, which is higher than most other alloys. Additionally, it has good fatigue resistance, with the ability to withstand cyclic loading and higher stresses.

Material Condition Ultimate Tensile Strength ksi 0.2 % Yield Strength ksi Elongation % Reduction of Area % Hardness HRC
MP35N ®
AMS 5844
Solution Heat Treated and Work Strengthened 255 225 12 50 45
AMS 5845
Solution Heat Treated and Work Strengthened and Aged 260 230 8 35 38 min

MP35N Cobalt Alloy Physical Properties

mp35n Cobalt alloy has unique physical properties, including high melting temperature, density, and thermal conductivity. It has a melting point of 1300°C and a density of 8.36 g/cm³. It also has excellent heat transfer properties, which makes it a great material for high-temperature applications.

MP35N Cobalt Alloy Corrosion Resistance

One of the most significant benefits of mp35n cobalt alloy is its superior corrosion resistance. It is highly resistant to pitting and crevice corrosion, making it ideal for use in harsh environments such as the marine and oil & gas industries. It is also highly resistant to stress corrosion cracking (SCC), which can result in the failure of components in aggressive environments.

MP35N Cobalt Alloy Uses

mp35n Cobalt alloy is used in various applications that require high strength, ductility, and corrosion resistance. It is commonly used in the aerospace, defence, medical, and oil & gas industries. In aerospace, mp35n cobalt alloy is used in aircraft engine components such as valves, springs, and rotors. It’s also used in medical implants such as pacemaker components, stents, and prosthetics. Its superior corrosion resistance is ideal for oil and gas applications, including downhole tools, valves, and tubing.

MP35N Cobalt Alloy Heat Treatment and Machining

mp35n Cobalt alloy can be heat treated to enhance its mechanical properties and corrosion resistance. It can be treated with solution annealing, which softens, followed by ageing, which strengthens the alloy. Machining mp35n cobalt alloy can be difficult due to its high strength and toughness. It requires sharp tools, careful setup, and slow speeds to avoid overheating and tool damage.

MP35N Cobalt Alloy Welding

mp35n Cobalt alloy can be welded using various processes such as gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW). It is essential to use compatible filler metals to avoid intergranular cracking and ensure the final weld has the right mechanical properties.


mp35n Cobalt alloy is an essential material in several industries and applications. It combines excellent mechanical and physical properties, high strength, good ductility, corrosion resistance, and heat transfer properties. Its use in cutting-edge technologies has made it crucial in advancing several fields. By understanding its properties and applications, individuals and enterprises can identify opportunities to utilize it for various purposes, from aerospace and defence to the medical industry.

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