Brass - double and multi-copper alloys, where the main alloying component - zinc. Compared to Copper brass have higher strength, corrosion resistance, casting properties and the temperature of recrystallization. This is the cheapest Copper alloys. Brass is widely used in engineering and many industries.
Copper-zinc alloys doped with one or more elements called special brass. Grades marked by letter L with copper content in %. In a special brass after the letter L there are additional alloying elements and a dash after the Copper indicate the content of input elements as a percentage. Brass processing is divided into deformed brass and cast. Deformed brass sheets, strips, bars, rods. pipe, wire, forgings.
The main alloying elements in a special brass - Aluminum, iron, silicon, manganese, arsenic, nickel, tin, lead. Aluminum, as well as nickel and tin increased strength, corrosion resistance brass in air, marine atmosphere and sea water, and improves frictional properties. Iron grinds grain, increases the recrystallization temperature and hardness of brass. Silicon improves the strength, corrosion resistance, anti-friction properties, and manganese - heat resistance. Arsenic prevents dezincification of brass in aggressive fresh water at room temperatures. Additive nickel, arsenic and iron to aluminum brass enhance its resistance to dilute acids and alkalis. Lead, almost insoluble in Copper-based is as dispersed particles in the bulk grains and along their boundaries. Lead - a kind of lubricant that reduces wear on the tool during machining brass. Small, easily separates dust from machining, produces surface workpieces of high purity.
Brass easy to process by pressure in the hot and cold state. Brass well soldered hard and soft Solder and welded easier than Copper. Brass containing more than 15% zinc in the cold-deformed state, prone to self-corrosion cracking in storage, especially in a humid atmosphere containing sulfur gases or ammonia. To protect it from cracking brass intermediates and products are subjected to low temperature annealing (250-300 °C), which reduces the residual stresses.
Brass products are produced in soft (annealed), semi-solid, hard state.
|Grades and chemical composition of brass|
|Grade||Chemical composition, %||Density||Scope|
Sheet, strip, rod, tube, wire components in electrical engineering, for medals and badges
Sheets, strips, bars, wire, art products, bellows, manometer tube, hoses, musical instruments
Radiator tapes, strips, pipes, heat exchangers, musical instruments, parts, produced by deep drawing
Wire mesh, radiator strip, tubes for heat exchangers, parts, produced by deep drawing
Sheets, strips, bars, tubes, rods, foil, wire, parts, produced by deep drawing
Tube sheets in refrigeration, stamped parts, accessories