Alloy Grade UNS: R30021 – Non-Galling Alloy

  • Overview

    R30021 is a specialized cobalt-based alloy engineered for high-temperature applications where galling resistance and thermal stability are paramount. This non-galling alloy exhibits exceptional resistance to wear and galling, a form of surface damage caused by adhesive friction between sliding components. With a nickel content capped at a maximum of 3%, R30021 maintains a relatively low melting temperature while offering excellent resistance to heat and thermal shock. This combination of properties makes it a valuable choice for demanding environments where components experience high temperatures, thermal cycling, and friction, requiring a material that can resist wear and maintain its structural integrity.

  • Typical Uses

    Aerospace, bearings, housings, medical devices.

  • MetalTek Grade

    MTEK 21

  • Poured At:

    Wisconsin Centrifugal Division, Wisconsin Investcast Division

Similar Specifications

Cast UNS: R30021

Cast Grade:

Cast ASTM: A732

Military/AMS: AMS 5385

* AMS specifying investment casting.

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 1.8-2.5

Chromium: 23-26

Manganese: 0.5

Iron: 2.0 MAX

Copper: n/a

Nickel: 3.0 MAX

Lead: n/a

Tin: n/a

Silicon: 0.80-1.50

Zinc: n/a

Other: Co BAL; W 11-13

Minimum Mechanical Properties

Heat Treatment: Not Heat Treated

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