SubsTech     
SubsTech     

to Metals
to Copper alloys

Wrought phosphor bronzes

Dr. Dmitri Kopeliovich

According to the Unified Numbering System (UNS):

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 strengthened by cold work (strain hardening). Ductility of the alloys decreases as a result of cold work.

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.

Chemical compositions of some wrought phosphor bronzes

UNS Designation Trade mark Sn,% Pb,% P,% Zn,% Cu,%
C50500 Phosphor Bronze
1.25% E
1.0-1.7 0.05 max. 0.03-0.35 0.30 max. balance
C51000 Phosphor Bronze
5% A
4.2-5.8 0.05 max. 0.03-0.35 0.30 max. balance
C52100 Phosphor Bronze
8% C
7.0-9.0 0.05 max. 0.03-0.35 0.20 max. balance
C52400 Phosphor Bronze
10% D
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

Properties of some wrought phosphor bronzes

Related internal links

Related external links

wrought_phosphor_bronzes.txt · Last modified: 2013/04/06 by dmitri_kopeliovich
Promote in SubsTech       Creative Commons License Except where otherwise noted, this work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License