Data Sheet D5 - CuZn28, CuZn30
(1970 Edition)
Wrought Materials - Copper-Zinc Alloys - Brasses
This data sheet covers both CuZn28 and CuZn30, since these alloys have very similar compositions and properties.
Common names: 70/30 Brass
Cartridge Brass
Deep-Drawing Brass
Two copper-zinc alloys with an alpha phase structure. The alloys exhibit the optimum combination of strength and ductility in the copper-zinc series and are commonly used whenever extreme cold deformation is involved. Cu Zn28 is produced only in some European countries for applications for which American and British industrial practice would specify Cu Zn30. Service environment for both alloys must be considered to predict corrosion behaviour. A typical application of these alloys is for deep-drawn components such as cartridge cases. Cu Zn30 also includes the inhibited variety containing arsenic, which is generally used for heat-exchanger tubes.
COMPOSITION (weight %)
Cu Zn28 Cu Zn30 *
Cu 71.0 - 73.0 Cu 68.5 - 71.5
Zn rem. Zn rem.
* Arsenic is sometimes added as a corrosion inhibitor
INDEX NUMBERS RELATE TO LITERATURE REFERENCE; INDEX LETTERS RELATE TO FOOTNOTES AT END OF TABLE
Chemical
Heat-exchanger tubes handling fresh, clean water; sugar evaporators and juice heaters; fire-extinguisher bodies.
Electrical
Lamp caps and lampholder components.
Hardware
Chain, eyelets, fasteners, hinges, locks, fingerplates, wire cloth, wire brushes.
Mechanical
Wide variety of deep-drawn and spun components, including cartridge cases and musical instruments; automobile radiator tanks and tubes; carburettor parts; wire reinforcements in brake and clutch linings; general industrial pressings formed from sheet and strip; torch and flashlight cases; reflectors; cold-headed or "upset" products such as rivets, pins and screws.