1 an alloy of copper and zinc
2 a wind instrument that consists of a brass tube (usually of variable length) blown by means of a cup-shaped or funnel-shaped mouthpiece
3 the persons (or committees or departments etc.) who make up a body for the purpose of administering something; "he claims that the present administration is corrupt"; "the governance of an association is responsible to its members"; "he quickly became recognized as a member of the establishment" [syn: administration, governance, governing body, establishment, organization, organisation]
4 impudent aggressiveness; "I couldn't believe her boldness"; "he had the effrontery to question my honesty" [syn: boldness, nerve, face, cheek]
5 an ornament or utensil made of brass
6 the section of a band or orchestra that plays brass instruments [syn: brass section]
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. In comparison, bronze is principally an alloy of copper and tin. Despite this distinction, some types of brasses are called bronzes. 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. When pollished brass can be very shiney, like a mirror. It can also be brushed which is basicaly a scratched up appearance
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. In the German village of Breinigerberg an ancient Roman settlement was discovered where a calamine ore mine existed. During the melting process, the zinc is extracted from the calamine and mixes with the copper. Pure zinc, on the other hand, has too low a boiling point to have been produced by ancient metalworking techniques. The many references to 'brass' appearing throughout the King James Bible are thought to signify another bronze alloy, or copper, rather than the strict modern definition of 'brass'.
The malleability and acoustic properties of brass have made it the metal of choice for brass musical instruments such as the trombone, tuba, trumpet, euphonium, and the French horn. Even though the saxophone is classified as a woodwind instrument and the harmonica is a free reed aerophone, both are also often made from brass. In organ pipes designed as "reed" pipes, brass strips are used as the "reeds".
Brass has higher malleability than copper or zinc. The relatively low melting point of brass (900 to 940°C, depending on composition) and its flow characteristics make it a relatively easy material to cast. By varying the proportions of copper and zinc, the properties of the brass can be changed, allowing hard and soft brasses.
Today almost 90% of all brass alloys are recycled. Because most brass is nonmagnetic, it can be separated from ferrous scrap by passing the scrap near a powerful magnet. Brass scrap is collected and transported to the foundry where it is melted and recast into billets. Billets are heated and extruded into the desired form and size.
Aluminum makes brass stronger and more corrosion resistant. Aluminum also causes a highly beneficial hard layer of aluminium oxide (Al2O3) to be formed on the surface that is thin, transparent and self healing. Tin has a similar effect and finds its use especially in sea water applications (naval brasses). Combinations of iron, aluminum, silicon and manganese make brass wear and tear resistant. A well known alloy used in the automotive industry is 'LDM C673', where the combination of manganese and silicon leads to a strong and resistant brass.
ApplicationsThe so called dezincification resistant (DZR) brasses, like alloy 'LDM G563' (known for its brand name 'Enkotal'), are used where there is a large corrosion risk and where normal brasses do not meet the standards. Applications with high water temperatures, chlorides present or deviating water qualities (soft water) play a role. DZR-brass is excellent in water boiler systems. This brass alloy must be produced with great care, with special attention placed on a balanced composition and proper production temperatures and parameters to avoid long-term failures. Drunen, Netherlands, has the only active production facility which makes these high grade brass alloys.
The copper in brass makes brass germicidal, via the oligodynamic effect. For example, brass doorknobs disinfect themselves of many bacteria within eight hours http://members.vol.at/schmiede/MsgverSSt.html. This effect is important in hospitals, but useful in many contexts.
Brass door hardware is generally lacquered when new, which prevents tarnishing of the metal for a few years when located outside (and indefinitely when located indoors). After this most manufacturers recommend that the lacquer is removed (e.g. with paint stripper) and the items regularly polished to maintain a bright finish. Unlacquered brass weathers more attractively than brass with deteriorated lacquer, even if polishing is not carried out. Freshly polished brass is similar to gold in appearance, but becomes more reddish within days of exposure to the elements. A traditional polish is Brasso.
Brass was used to make fan blades, fan cages and motor bearings in many antique fans that date before the 1930s. Brass can be used for fixings for use in cryogenic systems, however its use is not limited to this.
Season crackingBrass is susceptible to stress corrosion cracking, especially from ammonia or substances containing or releasing ammonia. The problem is sometimes known as season cracking after it was first discovered in brass cartridge cases used for rifle ammunition during the 1920s in the Indian Army. Brittle cracks could cause serious accidents if the case was too weak to resist the charge when the rifle was fired. The problem was caused by high residual stresses from cold forming of the cases during manufacture, and was cured by annealing the cases.
The density of brass is approximately .
- 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.
- White brass contains more than 50% zinc and is too brittle for general use.
- Yellow brass is an American term for 33% zinc brass.
- Copper alloys
- Calamine brass — brass alloy and manufacturing process from discovery until the late 18th century
- Gilding metal; the softest form of brass commonly available
- Corinthian brass — an alloy of gold, silver and copper, known to antiquity
- Pinchbeck — a brass that closely resembles gold in appearance.
- Bronze — an alloy of copper with tin and optionally zinc, silicon, nickel and other metals
- Cupronickel — an alloy of copper with nickel
- Tombac — an alloy of copper with zinc
- Brass instrument — a musical instrument usually made of brass
- Brass rubbing — reproduction of brasses, commemorative plates laid down in British and European churches from the 13th Century onwards'''
- Brass bed — history of the usage of brass in beds and bedframes
- Latten — early brass alloys (Calamine brasses)
- Season cracking — attack of brass by ammonia
brass in Bengali: পিতল
brass in Belarusian: Латунь
brass in Bosnian: Mesing
brass in Bulgarian: Месинг
brass in Catalan: Llautó
brass in Chuvash: Йĕс
brass in Czech: Mosaz
brass in Danish: Messing
brass in German: Messing
brass in Estonian: Messing
brass in Modern Greek (1453-): Ορείχαλκος
brass in Spanish: Latón
brass in Esperanto: Latuno
brass in Basque: Letoi
brass in Persian: برنج (آلیاژ)
brass in French: Laiton
brass in Korean: 황동
brass in Hindi: पीतल
brass in Croatian: Mjed
brass in Indonesian: Kuningan (logam)
brass in Icelandic: Látún
brass in Italian: Ottone (metallo)
brass in Hebrew: פליז
brass in Georgian: თითბერი
brass in Luxembourgish: Messeng
brass in Lojban: lastu
brass in Dutch: Messing (metaallegering)
brass in Japanese: 黄銅
brass in Norwegian: Messing
brass in Norwegian Nynorsk: Massing
brass in Polish: Mosiądz
brass in Portuguese: Latão
brass in Kölsch: Messing
brass in Romanian: Alamă
brass in Russian: Латунь
brass in Scots: Bress
brass in Simple English: Brass
brass in Slovak: Mosadz
brass in Slovenian: Med (kemija)
brass in Serbian: Месинг
brass in Finnish: Messinki
brass in Swedish: Mässing
brass in Tamil: பித்தளை
brass in Telugu: ఇత్తడి
brass in Thai: ทองเหลือง
brass in Turkish: Pirinç (alaşım)
brass in Ukrainian: Латунь
brass in Chinese: 黃銅
ADC, CO, Establishment, German band, OD, Philharmonic, VIP, aide, aide-de-camp, alpenhorn, alphorn, althorn, alto horn, arch, aristocracy, aureate, ballad horn, band, baritone, baron, barons, barrow, bass horn, big band, big gun, big man, big name, bigwig, blunt, board, board of directors, board of regents, board of trustees, boodle, boundary stone, brashness, brass band, brass choir, brass hat, brass quintet, brass section, brass wind, brass-wind instrument, brasses, brassy, brazen, brazen boldness, bread, brigadier, brigadier general, bronze, bronzy, bucks, bugle, bugle horn, bust, cabbage, cabinet, cadre, cairn, callithumpian band, captain, celebrity, cenotaph, chamber orchestra, cheek, chicken colonel, chief of staff, chips, chutzpah, clarion, colonel, column, combo, commandant, commander, commander in chief, commanding officer, commissioned officer, company officer, concert band, confidence, copper, coppery, cornet, cornet-a-pistons, corno di caccia, cornopean, council, cream, cromlech, cross, crust, cup, cupreous, cuprous, cyclolith, desks, dignitary, dignity, dinero, directorate, directory, dixieland band, do-re-mi, dolmen, double-bell euphonium, dough, effrontery, elder, elite, ensemble, establishment, euphonium, exec, executive arm, executive committee, executive hierarchy, executive officer, face, father, ferrous, ferruginous, field marshal, field officer, figure, first lieutenant, five-star general, footstone, four-star general, gall, gamelan orchestra, gelt, general, general officer, generalissimo, gilt, gold, gold-filled, gold-plated, golden, governing board, governing body, grave, gravestone, grease, great man, green, green stuff, group, headstone, helicon, heroics, hoarstone, horn, hubris, hunting horn, important person, improvidence, imprudence, impudence, indiscretion, infrastructure, injudiciousness, inscription, insolence, interests, interlocking directorate, iron, ironlike, jack, jazz band, jemadar, jug band, junior officer, kale, key trumpet, lead, leaden, lieutenant, lieutenant colonel, lieutenant general, lion, lituus, lords of creation, lur, magnate, major, major general, man of mark, management, marechal, marker, marshal, mausoleum, mazuma, megalith, mellophone, memento, memorial, memorial arch, memorial column, memorial statue, memorial stone, menhir, mercurial, mercurous, military band, mogul, monolith, monument, moolah, mopus, mound, nabob, name, necrology, nerve, nickel, nickelic, nickeline, nobility, notability, notable, obelisk, obituary, officer, oil of palms, ointment, one-star general, oof, ooftish, ophicleide, orchestra, orchestral horn, orderly officer, overboldness, overcarelessness, overconfidence, overlapping, oversureness, overweeningness, panjandrum, person of renown, personage, personality, pewter, pewtery, pillar, pillar of society, plaque, pocket trumpet, post horn, power, power elite, power structure, presumption, prize, pyramid, quartet, quicksilver, quintet, ragtime band, rashness, reliquary, remembrance, rhino, ribbon, risaldar, rock-and-roll group, rocks, rostral column, rudeness, ruling circle, ruling circles, ruling class, sachem, sackbut, saxhorn, saxtuba, senior officer, serpent, sextet, shaft, shavetail, shekels, shrine, silver, silver-plated, silvery, simoleons, sirdar, skiffle band, slide trombone, sliphorn, somebody, something, sousaphone, spondulics, staff officer, steel, steel band, steely, steering committee, stela, stone, street band, string band, string choir, string orchestra, string quartet, strings, stupa, subahdar, subaltern, sublieutenant, sugar, swing band, symphony, symphony orchestra, tablet, temerariousness, temerity, tenor tuba, testimonial, the Old Man, the administration, the best, the best people, the brass, the executive, the great, the needful, the people upstairs, the top, three-star general, tin, tinny, tomb, tombstone, top brass, top people, tope, trio, tromba, trombone, trophy, trumpet, tuba, two-star general, tycoon, unchariness, unwariness, upper class, upper crust, valve trombone, valve trumpet, very important person, waits, wampum, woodwind, woodwind choir, woodwind quartet, woodwinds, worthy