Copper Alloys Phosphor Bronze C51800 – Austral Wright Metals
Product Data Sheet – Copper Alloys
5% Phosphor Bronze UNS-C51800
Equivalent Alloy Specifications
Australian Product Specifications
AS1566 Rolled Flat Products & AS1567 Wrought Rods, Bars & Sections.
Available Forms can supply this alloy as coil, sheet and round rod.
General Description C51800 is the most widely used of the wrought phosphor bronzes, particularly in spring applications where the excellent resistance and fatigue endurance of various work-hardened tempers are major advantages of the alloy.
It also has a low coefficient of friction running against steel, combined with high strength. This makes it a popular choice for wear resistant guide strips and similar bearing applications involving boundary lubrication conditions.
Austral Wright Metals can also supply alloy C51000, a very similar alloy with 4.2-5.8% tin, 0.03-0.35% phosphorus without an aluminium addition, which has very similar properties and uses. Most material made to C51000 meets the specification requirements for C51800, and vice versa.
Japanese equipment often makes use of JIS C5191. This has 5.5-7.0% tin, and properties similar to C51800.
Engineering: bridge bearing plates, clutch discs, lock washers.
Electrical: fuse clips, terminal connectors, contacts, switch parts, springs.
Hardware: lock springs, fasteners.
Industrial: diaphragms, sleeve bushings, bellows, press tools.
Phase Diagram for Copper Tin Alloys – Bronzes
The corrosion resistance of 5% phosphor bronze is at least equal to copper, but the tin addition gives advantages in salt water and similar aggressive moist conditions where it is superior to copper.
Like copper, it does not suffer from dezincification and is seldom involved in stress corrosion failures unless there is a combination of very hard rolled material and specific chemicals such as mercury and ammonia compounds.
Please consult Austral Wright Metals for advice on your specific application.