Phosphor Bronzes are copper alloys, containing 1-13% of tin (Sn) and up to 0.3% of phosphorous (P) as the major alloying elements. Wrought Phosphor Bronzes (1.25% E, 5% A, 8% C, 10% D) are designated with the numbers from C50000 through C54999 (including lead phosphor bronzes).
Lead Phosphor Bronzes contain tin (Sn) and phosphorous (P) as the major alloying elements and up to 4% of lead (Pb) as additional alloying element. Wrought lead phosphor bronzes are designated with the numbers from C53000 through C54999.
Phosphor Bronzes containing up to 13% of tin have mono-phase structure (α-phase).
Such alloys have excellent formability in cold state and good corrosion resistance.
Phosphorous is added to the phosphor bronzes as deoxidizing agent during melting; however it also improves mechanical properties of the alloys.
Alloys, containing more than 13% of tin, have significant amount of brittle δ-phase.
These bronzes have very low formability and can not be used as wrought alloys.
Wrought Phosphor Bronzes are used for manufacturing sleeve bushings, springs, clutch discs, fittings, wear resistant parts, electrical contacts, sliding bearings, screw products, valve parts, pressure vessels, pump body castings, impellers for chemical plants.
|UNS Designation||Trade mark||Sn,%||Pb,%||P,%||Zn,%||Cu,%|
|C50500|| Phosphor Bronze|
|1.0-1.7||0.05 max.||0.03-0.35||0.30 max.||balance|
|C51000|| Phosphor Bronze|
|4.2-5.8||0.05 max.||0.03-0.35||0.30 max.||balance|
|C52100|| Phosphor Bronze|
|7.0-9.0||0.05 max.||0.03-0.35||0.20 max.||balance|
|C52400|| Phosphor Bronze|
|9.0-11.0||0.05 max.||0.03-0.35||0.20 max.||balance|
|C54400||Lead Phosphor Bronze B-2||3.5-4.5||3.5-4.5||0.01-0.50||1.5-4.5||balance|