What Is Brass?

Simple brass binary copper-zinc alloy is called simple brass. With the increase of zinc content, its color gradually changes from golden red to yellow, golden and white.

Simple brass

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Simple brass binary copper-zinc alloy is called simple brass. With the increase of zinc content, its color gradually changes from golden red to yellow, golden and white.

Zinc and copper can form six phases such as , , , , , and . There are three types of brass, ( + ) brass and brass commonly used in industry, and the zinc content generally does not exceed 50%. Among them, H62, H68 brass has high plasticity and strength, good formability, and is widely used. It can produce various complex cold-drawn and deep-drawn parts, waveguide and condenser pipe fittings, mechanical and electrical parts. H70 brass, also known as "gunmetal", is mainly used to make cartridge cases and pipes. Brass products with residual internal stress, which are stored for a long time in a medium containing ammonia or sulfur dioxide, will cause cracks along the crystals or through crystals. This phenomenon is called stress corrosion cracking or seasonal cracking (seasonal cracking) and can be eliminated by low temperature annealing. High-zinc brass with zinc content above 20% is prone to dezincification and corrosion. It can be suppressed by adding appropriate amounts of arsenic, silicon, phosphorus, antimony, etc.