Brass – Wikipedia

Alloy name Proportion by weight (%) Other Notes Copper Zinc Tin Lead Abyssinian gold 90 10 Admiralty brass 69 30 1 Tin inhibits loss of zinc in many environments. Aich’s alloy 60.66 36.58 1.02 1.74% iron Designed for use in marine service owing to its corrosion resistance, hardness and toughness. A characteristic application is to the protection of ships’ bottoms, but more modern methods of cathodic protection have rendered its use less common. Its appearance resembles that of gold.[37] Aluminium brass 77.5 20.5 2% aluminium Aluminium improves corrosion resistance. It is used for heat exchanger and condenser tubes.[38] Arsenical brass Arsenic; frequently aluminium Used for boiler fireboxes. Cartridge brass (C260) 70 30 — ≤0.07[39] Good cold working properties. Used for ammunition cases, plumbing, and hardware. Common brass 63 37 Also called rivet brass. Cheap and standard for cold working. DZR brass Arsenic Dezincification resistant brass with a small percentage of arsenic. Delta metal 55 41–43 1–3% iron with the balance consisting of various other metals. The proportions used make the material harder and suitable for valves and bearings. Free machining brass (C360) 61.5 35.5 2.5–3.7 0.35% iron Also called 360 or C360 brass. High machinability.[39] Gilding metal 95 5 Softest type of brass commonly available. Gilding metal is typically used for ammunition bullet “jackets”; e.g., full metal jacket bullets. Almost red in color. High brass 65 35 Has a high tensile strength and is used for springs, screws, and rivets. Leaded brass > 0 An alpha-beta brass with an addition of lead for improved machinability. Lead-free brass < 0.25 Defined by California Assembly Bill AB 1953 contains “not more than 0.25 percent lead content”.[16] Prior upper limit was 4%. Low brass 80 20 Light golden color, very ductile; used for flexible metal hoses and metal bellows. Manganese brass 77 12 7% manganese, 4% nickel Used as cladding for United States golden dollar coins.[40] Other manganese brass alloy compositions exist. Muntz metal 60 40 Traces of iron Used as a lining on boats. Naval brass 59 40 1 Similar to admiralty brass. Also known as Tobin bronze.[41]

Nickel brass 70–76 20–24.5 4–5.5% nickel The outer ring of the bi-metallic one pound and two pound sterling coins and the one euro coin, plus the center part of the two euro coin. Formerly used for the round one pound coin. Nordic gold 89 5 1 5% aluminum Used in 10, 20, and 50 cents euro coins. Orichalcum 75-80 15-20 Trace Trace amounts of nickel and iron Determined from 39 ingots recovered from an ancient shipwreck in Gela, Sicily. Pinchbeck 89% or 93% 11% or 7% Invented in the early 18th century by Christopher Pinchbeck. Resembles gold to a point where people can buy the metal as budget gold “effect” jewelry. Prince’s metal 75 25 A type of alpha brass. Due to its yellow color, it is used as an imitation of gold.[42] Also called Prince Rupert’s metal, the alloy was named after Prince Rupert of the Rhine. Red brass, Rose brass (C230) 85 5 5 5 Both an American term for the copper-zinc-tin alloy known as gunmetal, and an alloy which is considered both a brass and a bronze.[43][44] Red brass is also an alternative name for copper alloy C23000, which is composed of 14–16% zinc, a minimum 0.05% iron and minimum 0.07% lead content,[39] and the remainder copper.[45] It may also refer to ounce metal, another copper-zinc-tin alloy. Rich low brass, Tombac 5–20 Often used in jewelry applications. Silicon tombac 80 16 4% silicon Used as an alternative for investment cast steel parts. Tonval brass >


0 Also called CW617N or CZ122 or OT58. It is not recommended for sea water use, being susceptible to dezincification.[46][47] Yellow brass 67 33 An American term for 33% zinc brass.

Category : Công nghệ

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