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Brass
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Brass is any alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. Brass is a substitutional alloy. It is used for decoration for its bright gold-like appearance; for applications where low friction is required such as locks, gears, bearings, ammunition, and valves; for plumbing and electrical applications; and extensively in musical instruments such as horns and bells for its acoustic properties.
Brass has a muted yellow color, somewhat similar to gold. It is relatively resistant to tarnishing, and is often used as decoration and for coins. In antiquity, polished brass was often used as a mirror.
Brass has likely been known to humans since prehistoric times, even before zinc itself was discovered. It was produced by melting copper together with calamine, a zinc ore
We Pay TOP Dollar for Brass !
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Brass types
- Admiralty brass : contains 30% zinc and 1% tin which inhibits dezincification in most environments.
- Alpha brasses :(Prince's metal), with less than 35% zinc, are malleable, can be worked cold, and are used in pressing, forging, or similar applications. They contain only one phase, with face-centered cubic crystal structure.
- Alpha-beta brass : (Muntz metal), also called duplex brass, is 35-45% zinc and is suited for hot working. It contains both α and β' phase; the β'-phase is body-centered cubic and is harder and stronger than α. Alpha-beta brasses are usually worked hot.
- Aluminium brass: contains aluminium, which improves its corrosion resistance. Used in Euro coins (Nordic gold).
- Arsenical brass: contains an addition of arsenic and frequently aluminium and is used for boiler fireboxes.
- Beta brasses:, with 45-50% zinc content, can only be worked hot, and are harder, stronger, and suitable for casting.
- Cartridge brass : is a 30% zinc brass with good cold working properties.
- Common brass: , or rivet brass, is a 37% zinc brass, cheap and standard for cold working.
- DZR brass : is Dezincification resistant Brass with a small percentage of Arsenic.
- Gilding metal : is the softest type of brass commonly available. An alloy of 95% copper and 5% zinc, gilding metal is typically used for ammunition components.
- High brass : , contains 65% copper and 35% zinc, has a high tensile strength and is used for springs, screws, rivets.
- Leaded brass : is an alpha-beta brass with an addition of lead. It has excellent machinability.
- Low brass : is a copper-zinc alloy containing 20% zinc with a light golden color, excellent ductility and is used for flexible metal hoses and metal bellows.
- Naval brass : , similar to admiralty brass, is a 40% zinc brass and 1% tin.
- Red brass : , while not technically brass, is an American term for CuZnSn alloy known as gunmetal.
- Rich low brass contains 85% copper 15% zinc often used in jewelry applications .
- White brass : contains more than 50% zinc and is too brittle for general use.
- Yellow brass : is an American term for 33% zinc brass.
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Nonferrous |
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