Stellite 21

ULTIMET Alloy / UNS R31233 / ASTM B815 / ASTM B818

ULTIMET Alloy is a nickel-based alloy developed for applications requiring exceptional corrosion resistance and high mechanical strength. Its composition primarily includes nickel (Ni), chromium (Cr), molybdenum (Mo), and also contains cobalt (Co) and tungsten (W) as reinforcing elements.

This advanced alloy offers exceptional performance in aggressive environments and is resistant to wear, oxidation, and stress corrosion.

Properties of ULTIMET Alloy

ULTIMET Alloy combines the best properties of nickel- and cobalt-based alloys. The material is exceptionally resistant to corrosion in both oxidizing and reducing environments, making it suitable for a wide range of industries. Its mechanical strength is maintained at high temperatures, while the alloy’s microstructure effectively counteracts fatigue and stress cracking.

The addition of tungsten and molybdenum increases strength and wear resistance, while chromium provides extra oxidation and corrosion protection. This makes ULTIMET Alloy a reliable choice for demanding environments where structural integrity is crucial.

The standards ASTM B815 and ASTM B818 specify the properties of this alloy in bar form and in sheet, foil, and strip form, respectively. Both standards ensure that the material meets strict requirements in terms of chemistry, mechanics, and processing conditions. This makes the material widely applicable, from industrial components to medical and aerospace applications.

Applications of ULTIMET Alloy

ULTIMET Alloy is widely used in sectors that demand high performance under corrosive and thermal stress. In the oil and gas industry, it is utilized for components that must withstand seawater and sour gases. In mining, it provides protection against wear from abrasive materials.

Within the aerospace and chemical industries, ULTIMET Alloy is employed for critical components that require high structural reliability and long-term resistance to oxidation. Additionally, some variants of this alloy are also used in medical instrumentation due to their combination of strength and corrosion resistance.

ULTIMET Alloy is the ultimate choice for applications that demand maximum resistance to corrosion, wear, and mechanical stress under extreme conditions.

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