Suhua Copper Alloy Co., Ltd. >> Brass Ring

Brass Ring

Brass Ring
Price: US $ 100/Piece
Min Order: 100/Piece
Pay Type: L/C,T/T

Product Specifications


Prod Model: ZCuZn25Si3
Type: Capillary Tube
Shape: Round
Application: Oil Cooler Pipe
Alloy: Alloy
Certification: RoHS
Standard: ASTM B819
State: Hard
Customized: Customized
Color: Yellow

Product Description

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  :

 
Microstructure of rolled and annealed brass (400X magnification

Brass has higher malleability than bronze or zinc. The relatively low melting point of brass (900 to 940 °C, 1652 to 1724 °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 g/cm³ (approximately .303 lb/cubic inch).

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.

Lead content  :
 

To enhance the machinability of brass, lead is often added in concentrations of around 2%. Since lead has a lower melting point than the other constituents of the brass, it tends to migrate towards the grain boundaries in the form of globules as it cools from casting. The pattern the globules form on the surface of the brass increases the available lead surface area which in turn affects the degree of leaching. In addition, cutting operations can smear the lead globules over the surface. These effects can lead to significant lead leaching from brasses of comparatively low lead content.

Silicon is an alternative to lead; however, when silicon is used in a brass alloy, the scrap must never be mixed with leaded brass scrap because of contamination and safety problems.

In October 1999 the California State Attorney General sued 13 key manufacturers and distributors over lead content. In laboratory tests, state researchers found the average brass key, new or old, exceeded the California Proposition 65 limits by an average factor of 19, assuming handling twice a day.   In April 2001 manufacturers agreed to reduce lead content to 1.5%, or face a requirement to warn consumers about lead content. Keys plated with other metals are not affected by the settlement, and may continue to use brass alloys with higher percentage of lead content.

 Lead-free materials must be used for "each component that comes into contact with the wetted surface of pipes and pipe fittings, plumbing fittings and fixtures." On January 1, 2010, the maximum amount of lead in "lead-free brass" in California was reduced from 4% to 0.25% lead. The common practice of using pipes for electrical grounding is discouraged, as it accelerates lead corrosion
 

Corrosion-resistant brass for harsh environment :   
 

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.
 

Season cracking :
 

Cracking in brass caused by ammonia attack

Brass 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 cartridges used for rifle ammunition during the 1920s in the British Indian Army. The problem was caused by high residual stresses from cold forming of the cases during manufacture, together with chemical attack from traces of ammonia in the atmosphere. The cartridges were stored in stables and the ammonia concentration rose during the hot summer months, thus initiating brittle cracks. The problem was resolved by annealing the cases, and storing the cartridges elsewhere.



 

Suhua Copper Alloy Co., Ltd. Was founded in 2010. We are the professional and forerunner in the field of copper alloy R&D and manufacturing in China. Our management team has nearly 30 year's experiences in the field of copper alloy manufacturing.

The copper alloys we manufacture includes: Chromium zirconium copper(C18150), chromium copper(C18200), nickel silicon chromium copper (C18000), nickel beryllium copper(C17510, C17500), beryllium copper(C17200, C17300), Zirconium Copper(C15000, C15100), Tellurium Copper (C14500), Oxygen free copper (C10100/C10200), copper nickel alloys(C79200/C79400) etc...

The forms we manufacture include: Round bars, square bars, rectangular bars, hexagonal bars and different types of plates and sheets per customers' requirements.

With more than 20 years of copper alloys R&D and manufacturing experiences, coupled with a full range of manufacturing equipments. Our manufacturing process starts with raw materials and ends with customized shape/forms copper alloys. This enables us to supply high quality copper alloys at very competitive prices.

Over the past years, we have earned a nationwide reputation for high quality materials at competitive prices, quick deliveries and superior services.

Our materials are being exported to Europe, North America, North-east Asia, South-east Asia etc.

Quality is an essential part of our manufacturing operations, our highly trained quality assurance team will do all necessary testings and inspections to make sure that all materials are met customers' requirements and expectations before shipping the materials to our customers.

Our copper alloys are mainly used in automobile industry, aerospace industry, aircraft industry, appliance industry, consumer electronics, electronic equipments, electrical equipment, foundry products, industrial machinery, machine tools, resistance welding industry, telecommunication industry, transportations(high speed train) etc.

Our materials are used by Volkswagon, Toyota, Hongda, Ford, China high speed train etc.

Our factory, covering an area of 6, 000 square meters, staffed with 60 persons, is located in Gushan town, Jingjiang city of Jiangsu province, China. Our daily capacity is up to 3 tons. Space is available to make a quick capacity expansion.

For more information on our products, please visit our website: www.shcalloy.com

You are welcome to visit us at any time!

For any inquiry, please contact our export company: Rich Base Technology Co., Limited.

Contact: Steven Chang

Tel: 86-1380-166-0687

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