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Bronze Tube

ACA can offer a wide range of grades, tempers and sizes to suit customer specifications. Bronze tube is often used for a combination of its properties such as high strength, hardness, corrosion resistance, wear resistance and its aesthetics.

Bronze alloy CW451K/PB102 is a Phosphor Bronze. Phosphor Bronzes are alloys of bronze with phosphor. PB102 has good corrosion resistance and is known for its high fatigue strength. It also shows a good combination of strength and ductility.


CW451K/PB102 is typically used in:

  • Gears
  • Worm Gears
  • Bushes
  • Marine applications
  • Aircraft applications
  • Chemical applications
  • Springs

CW451K/PB102 is the most widely used of the wrought phosphor bronzes.

Alloy Designations

CW451K/PB102 Bronze corresponds to the following designations:

  • UNS C51000
  • ISO CuSn5

Corrosion Resistance

Alloy CW451K/PB102 has good corrosion resistance, almost equivalent to that displayed by the Aluminium Bronzes.

Cold Working

Cold working response of CW451K/PB102 is excellent.

Hot Working

Hot formability of CW451K/PB102 is poor.

Heat Treatment

Solution treatment or annealing of CW451K/PB102 can be done by rapid cooling after heating to 500-700°C.


The machinability rating of CW451K/PB102 is rated as poor at 20 compared to Brass CZ121/CW614N which is rated as 100.


Soldering, brazing and butt welding of CW451KPB102 are rated as excellent.

Oxyacetylene welding, seam welding and coated metal arc welding are rated as fair.

Spot welding and gas shielded arc welding are rated as good.

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