Copper (UNS C47000)

Topics Covered

Chemical Composition
Physical Properties
Other Designations


UNS designations C40400 to C49080 are a group of copper alloys that fall under the category of tin brasses. Tin brasses possess many unique properties such as improved corrosion resistance, good hot forgeability, fair cold formability, lower cost, and slightly higher strength than regular brass.

Copper UNS C47000 is a tin brass wrought alloy. It is also known as a naval brass. The following datasheet discusses the chemical composition and properties of copper UNS C47000.

Chemical Composition

The chemical composition of copper UNS C47000 is given in the following table.

Element Content (%)
Copper, Cu 57 - 61
Tin, Sn 0.25 - 1
Lead, Pb 0.05 max
Aluminum, Al 0.01 max
Zinc, Zn Balance

Physical Properties

The following table discusses the physical properties of copper UNS C47000.

Properties Metric Imperial
Density 8.9 g/cm3 0.323 lb/in3

Other Designations

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Other designations that are equivalent to copper UNS C47000 include:

  • ASME SFA5.8
  • QQ B650


Machinability - The machinability of copper UNS C47000 alloy is rated at 30.

Welding – Various types of welding methods can be used on this alloy. Soldering and brazing are rated as excellent. Butt welding, spot welding, and oxyacetylene welding are rated as good, while seam welding and gas shielded arc welding are rated as fair. It should be noted that coated metal arc welding is to be avoided.

Forging - Copper UNS C47000 alloy has a hot forgeability rating of 90.

Hot working - Copper UNS C47000 alloy has excellent hot working abilities. The recommended hot working temperature ranges between 649 and 816°C (1200 and 1500°F).

Cold working - Copper UNS C47000 alloy has fair cold working properties.

Annealing - Copper UNS C47000 alloy is annealed at temperatures ranging from 427 and 593ºC (800 and 1100ºF).


Copper UNS C47000 finds applications in the following:

  • Marine construction
  • Salt and fresh water applications
  • Propeller shafts
  • Decorative fittings
  • Shafting
  • Turn buckles
  • Industrial applications - such as condenser plates, structural uses, welding rod, heat exchanger tube, valve stems, balls, aircraft turn buckle barrels, golf ball production, and dies.

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