Alloy Grade UNS: C21000 – Gliding Metal

  • Overview

    C21000, or gilding metal, is a copper-zinc alloy with 95% copper and 5% zinc. This composition provides strength and ductility for shaping through drawing and stamping. C21000 has adequate electrical conductivity and resists tarnishing. Its corrosion resistance is moderate, with vulnerability to dezincification in acidic environments.

  • Typical Uses

    Rolled bar, plate, sheet for making coins, medals, tokens, gun components, and plaques.

  • MetalTek Grade

    MTEK 210

Similar Specifications

Cast UNS: C21000

Wrought UNS: C21000

Cast Grade:

Other Specifications: Gilding 95%

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: n/a

Chromium: n/a

Manganese: n/a

Iron: 0.05

Copper: 95

Nickel: n/a

Lead: 0.05

Tin: n/a

Silicon: n/a

Zinc: BAL

Minimum Mechanical Properties

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Stainless steels owe their ability to resist corrosion primarily to the presence of a passive film on their surface. Chromium is chiefly responsible for formation of the passive film. Iron ceases to rust at approximately 12% chromium content and resistance to oxidizing corrosives increases rapidly with chromium content up to approximately 20%.
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