Brass types

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Brass types
Views: 1315  Update Date:Apr 03 , 2019
Class Proportion by weight (%) Notes
Copper Zinc
Alpha brasses > 65 < 35 Alpha brasses 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. With their high proportion of copper, these brasses have a more golden hue than others
Alpha-beta brasses 55–65 35–45 Also called duplex brasses, these are suited for hot working. They contain both α and β' phases; the β'-phase is body-centered cubic and is harder and stronger than α. Alpha-beta brasses are usually worked hot. The higher proportion of zinc means these brasses are brighter than alpha brasses.
Beta brasses[citation needed] 50–55 45–50 Beta brasses can only be worked hot, and are harder, stronger, and suitable for casting. The high zinc-low copper content means these are some of the brightest and least-golden of the common brasses.
Gamma brasses 33–39 61–67 There are also Ag-Zn and Au-Zn gamma brasses, Ag 30–50%, Au 41%.[26]
White brass < 50 > 50 These are too brittle for general use. The term may also refer to certain types of nickel silver alloys as well as Cu-Zn-Sn alloys with high proportions (typically 40%+) of tin and/or zinc, as well as predominantly zinc casting alloys with copper additives. These have virtually no yellow coloring at all, and instead have a much more silvery appearance.

Brass alloys
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.[27]
Aluminum brass 77.5 20.5

2% aluminum Aluminum improves corrosion resistance. It is used for heat exchanger and condenser tubes.[28]
Arsenical brass

Arsenic; frequently aluminum Used for boiler fireboxes.
Cartridge brass (C260) 70 30  0.07[29]
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
3 0.35% iron Also called 360 or C360 brass. High machinability. Lead content, 2.5–3.7%[29]
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 springsscrews, 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".[14] Prior upper limit was 4%.
Low brass 80 20

Light golden color, very ductile; used for flexible metal hoses and metal bellows.
Manganese brass 70 29

1.3% manganese Most notably used in making golden dollar coins in the United States.[30]
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.[31]
Nickel brass 70 24.5

5.5% nickel Used to make pound coins in the pound sterling currency. Also the main constituent of the bi-metallic One Euro coin and the centre part of the Two Euro coin.
Nordic gold 89 5 1
5% aluminium Used in 10, 20, and 50 cents euro coins.
Prince's metal 75 25

A type of alpha brass. Due to its yellow color, it is used as an imitation of gold.[32] 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.[33][34] 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,[29]and the remainder copper.[35] It may also refer to ounce metal, another copper-zinc-tin alloy.
Rich low brass, Tombac

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.[36][37]
Yellow brass 67 33

An American term for 33% zinc brass.

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