ThePipingMart Blog Grades X40 Cobalt Alloy (UNS R30031) – Composition, Properties, and Uses

X40 Cobalt Alloy (UNS R30031) – Composition, Properties, and Uses

 X40 Cobalt Alloy

Cobalt alloys are becoming increasingly popular when it comes to creating high-performance materials used in a range of industries. One such alloy gaining traction in the market is the X40 Cobalt Alloy. This versatile material possesses several desirable properties, such as excellent corrosion resistance, high strength, and toughness. In this blog post, we will closely examine what X40 Cobalt Alloy is, its composition, physical and mechanical properties, and heat treatment.

What is X40 Cobalt Alloy?

X40 cobalt alloy is a high-performance material widely used in different industries for its unique properties. It is a corrosion-resistant alloy made of cobalt, chrome, and other elements. Its remarkable features include excellent resistance to high-temperature corrosion, thermal fatigue, and oxidation. X40 cobalt alloy is known for its high strength, wear resistance, and toughness. It is ideal for applications in extreme environments, such as aviation, chemical plants, and biomedical implants. X40 cobalt alloy is one of the most reliable materials to withstand intense stress, pressure, and temperatures while maintaining its structural integrity.

X40 Cobalt Alloy Composition

X40 Cobalt Alloy is a cast cobalt-based superalloy with high oxidation resistance and excellent mechanical properties. The composition of this alloy includes 39-45% cobalt, 20-25% chromium, 10-12% nickel, 8-9% tungsten, 4-5% molybdenum, 1% iron max, and 1% carbon max. The alloy also contains smaller amounts of other materials, such as titanium, silicon, and boron. This composition is what gives X40 Cobalt Alloy its unique properties.

X40 Cobalt Alloy Physical Properties

X40 Cobalt Alloy has a density of 8.3 g/cm3, making it a relatively lightweight material. Its melting point is around 1320-1390℃, and it has a thermal conductivity of 14.8 W/mK at room temperature. In addition, it exhibits excellent corrosion resistance to a wide range of chemicals and environments and has good thermal stability at elevated temperatures.

X40 Cobalt Alloy Mechanical Properties

The mechanical properties of X40 Cobalt Alloy are impressive, making it a highly sought-after material in the aerospace, biomedical, and power generation industries. It has a tensile strength ranging from 800-1000 MPa, a yield strength of 400-420 MPa, and a high fatigue strength. The alloy is also flexible and can withstand high-temperature environments up to 800℃.

X40 Cobalt Alloy Hardness

X40 Cobalt Alloy is a very hard material, with a hardness of around 34-40 HRC after heat treatment. This high hardness helps to improve its wear resistance, making it ideal for use in high-stress applications where other materials may fail.

X40 Cobalt Alloy Heat Treatment

Heat treatment is essential for X40 Cobalt Alloy to achieve the desired properties. The alloy can be heat-treated by various methods depending on the final application. The most common method is solution annealing, followed by ageing. Solution annealing involves heating the alloy to 1000-1100℃ for 2-4 hours before quenching in water or oil. Ageing the alloy involves tempering at 850-950℃ for 4-6 hours. This process results in the precipitation of carbides and intermetallic phases, which contribute to the material’s strength and hardness.


X40 Cobalt Alloy is a versatile material with unique physical and mechanical properties, making it a choice for various applications. The high corrosion resistance, strength, and toughness make it ideal for aerospace, biomedical, and power generation industries. It is lightweight, has excellent thermal stability, and can withstand high-temperature environments. Heat treatment is crucial for X40 Cobalt Alloy to achieve the desired properties for different applications. As research in materials science continues to evolve, we can expect to see even more exciting applications for X40 Cobalt Alloy.

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