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 Designation

    MTEK 21

  • Poured At:

    Wisconsin Centrifugal Division, Wisconsin Investcast Division

Similar Specifications

Cast UNS: R30021

Cast Grade:

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

Frequently Asked Questions

Cobalt-based alloys are high-performance materials offering superior wear, heat, and corrosion resistance.

Used in aerospace, turbines, cutting tools, and wear components that require strength and oxidation resistance.

These alloys maintain hardness at high temperatures, resist oxidation and corrosion, and are biocompatible for medical use.

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