Active Member
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[China]
Address: Rm 704, Building 2, No.3, Leading tower, Guangqumen Nei,Dongchen District, Beijing, China
Contact name:Helen Ren
Sumer (Beijing) International Trading Co., Ltd. |
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Main information:
Product name:Brass decoration (scroll)
Model: BD027
Brand: B&R
Application: Decoration for Tombstone ,cemetery or others.
Origin: China
Manufacturer: Sumer International (Beijing) Trading Co.,Ltd
Product detail:
Size:13*9cm
Material: Brass (Copper alloy)
Color /finishing: Antique bronze
MOQ:500-1,000 pcs
Packing: Carton
Main feature:
Professionally engaged in funeral field over 10 years;
Customized products acceptable;
Good quality and competitive price;
More information:
Brass
Brass is a metal alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. It is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure.
By comparison, bronze is principally an alloy of copper and tin. However, bronze and brass may also include small proportions of a range of other elements including arsenic, phosphorus, aluminium, manganese, and silicon. The term is also applied to a variety of brasses, and the distinction is largely historical. Modern practice in museums and archaeology increasingly avoids both terms for historical objects in favour of the all-embracing "copper alloy".
Brass is used for decoration for its bright gold-like appearance; for applications where low friction is required such as locks, gears, bearings, doorknobs, ammunition casings and valves; for plumbing and electrical applications; and extensively in brass musical instruments such as horns and bells where a combination of high workability (historically with hand tools) and durability is desired. It is also used in zippers. Brass is often used in situations in which it is important that sparks not be struck, such as in fittings and tools used near flammable or explosive materials.
Properties
Brass has higher malleability than bronze or zinc. The relatively low melting point of brass (900 to 940 °C, 1,650 to 1,720 °F, 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. The density of brass is 8.4 to 8.73 grams per cubic centimetre (0.303 to 0.315 lb/cu in).
Today, almost 90% of all brass alloys are recycled. Because brass is not ferromagnetic, 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. The general softness of brass means that it can often be machined without the use of cutting fluid, though there are exceptions to this.
Aluminium makes brass stronger and more corrosion-resistant. Aluminium 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 seawater applications (naval brasses). Combinations of iron, aluminium, silicon and manganese make brass wear and tear resistant.
BRASS ALLOYS
| Alloy name | Copper (%) | Zinc (%) | Tin (%) | Lead (%) | Other | Notes |
| 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. | |
| Aluminum brass | 77.5 | 20.5 | 2% aluminum | Aluminum improves corrosion resistance. It is used for heat exchanger and condenser tubes. | ||
| Arsenical brass | arsenic, frequently aluminum | Used for boiler fireboxes. | ||||
| Cartridge brass (C260) | 70 | 30 | — | ≤ 0.07 | 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. |
Corrosion-resistant brass for harsh environments
The so-called dezincification resistant (DZR or DR) brasses, sometimes referred to as CR (corrosion resistant) brasses, 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.
More Picture:
Brass decoration---scroll vase and lantern
Brass bar
A copper disc (99.95% pure) made by continuous casting; etched to reveal crystallites.
Chuquicamata in Chile is one of the world's largest open pit copper mines.
