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Copper

Gilding Metal Copper Alloy - Properties and Applications




Also known as red brass, commercial bronze, gilding metal. C21000 combines a rich golden colour with the best combination of strength, ductility and corrosion resistance of the plain copper-zinc alloys. It weathers to a rich bronze colour, and can be supplied in pre-patinated colours ranging from deep brown to green. It has a lower rate of work hardening than the copper-zinc alloys with higher zinc content, such as 260 and 272. This is an advantage in multistage pressing applications without interstage annealing. It has excellent deep drawing characteristics and resistance to pitting corrosion and stress corrosion cracking when exposed to severe weather and water environments.

Typical applications include: Architectural fascias, grillwork, jewellery, ornamental trim, vitreous enamel base, badges, door handles, escutcheons, marine hardware, munitions, primer caps, rotating bands, metallic bellows, pen, pencil and lipstick tubes etc. Available forms of gilding metal: Austral Wright Metals can supply this alloy as sheet, strip and round bar.

Corrosion Resistance of Gilding Metal Copper Alloy
As an alpha brass with low zinc content, C22000 has excellent corrosion in most media. It is less susceptible to stress corrosion cracking than the higher zinc brasses such as 70/30 brass C26000, and is not considered susceptible in marine atmospheres. However, it should not be used in contact with aqueous ammonia and amines. C22000 should not be used with acetic acid, acetylene, brines, calcium chloride, moist chlorine, chromic acid, hydrochloric acid, mercury or its compounds, nitric acid and sodium hypochlorite.



Material Designation Corresponding Material Symbol
GB/T8890 ASTM B111 BS2871 JIS H3300 DIN 1785
Copper-Nickel BFe10-1-1 C70600 Pipe CN102 C7060 CuNi10Fe1Mn
BFe30-1-1 C71500 Pipe CN107 C7150 CuNi30Mn1Fe
(BFe30-2-2) C71640 CN108 C7164 CuNi30Fe2Mn2
(BFe5-1.5-0.5) C70400
B7
Aluminium Brass HAL77-2 C68700 Tube CZ110 C6870 CuZn20Al2
Admiralty Brass HSn70-1 C44300 Tube CZ111 C4430 CuZn28Sn1
Boric Brass Hsn70-18
HSn70-1 AB
Arsenical Brass H68A CZ126
Brass Tubes H65/H63 C28000/C27200 CZ108 C2800/C2700 CuZn36/CuZn37

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DIN 2393 St28 St34.2 St37.2 St44.2 St52.3 Welded Precision Steel Tubes
EN 10305-2 E195 E235 E355 Welded Cold Drawn Precision Steel Tube