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Whats the difference between phosphor bronze brass

2020-02-29 H:30:55
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Alias: tin phosphor bronze

Phosphor bronze contains 2% - 8% tin, 0.1% - 0.4% phosphorus, the rest is copper alloy. Mainly used as wear-resistant parts elastic parts.

Main uses: mainly used as wear-resistant parts elastic parts. Computer connector, mobile phone connector, high-tech industrial connector, electrical electronic spring, switch, electronic product slot, button, electrical connector, lead frame, vibration plate terminal, etc. Phosphor bronze has higher corrosion resistance, wear resistance no spark during impact. For medium speed heavy duty bearings, the operating temperature is 250 ℃. It has the function of automatic self-aligning, is sensitive to deflection, has high uniform bearing capacity, can bear radial load at the same time, can automatically lubricate without maintenance. Tin phosphor bronze is a kind of alloy copper, which has good conductivity is easy to heat. Tin phosphor bronze socket spring has a hard wired electrical structure, no rivet connection friction contact, which can ensure good contact, good elasticity smooth insertion. The alloy has excellent machinability chip forming property, which can quickly shorten the processing time of parts.

Brass is an alloy of copper zinc. When the zinc content is less than 35%, zinc can be dissolved in copper to form single phase a, which is called single phase brass. It has good plasticity is suitable for cold hot pressing.

When the zinc content is 36% - 46%, there are single-phase β solid solutions based on copper zinc, which are called duplex brass. β phase can decrease the plasticity increase the tensile strength of brass. Hot pressing treatment.

If the mass fraction of zinc continues to increase, the tensile strength will decrease there will be no use value.

The code is represented by "H number", h is brass, the number is the mass fraction of copper.

For example, H68 stands for brass with 68% copper 32% zinc. For cast brass, add "Z" before the code, e.g. zh62.

For example, zcuzn38 stands for cast brass with 38% zinc content copper margin.

H90 H80 belong to single-phase brass, golden yellow, so they are collectively referred to as gold, electroplating, decoration, medals, etc.

H68 H59 are two-phase brass, which are widely used in electrical components, such as bolts, nuts, washers, springs, etc.

In general, single phase brass used for cold deformation is used for dual phase brass used for hot deformation.

special brass 

A multicomponent alloy composed of other alloying elements added to common brass is called brass. The elements usually added are lead, tin, aluminum, etc., so they can be called lead brass, tin brass aluminum brass respectively. The purpose of adding alloying elements. The main purpose is to improve the tensile strength processing performance.

Code: "mass fraction of H main additive element symbol (except zinc), mass fraction of copper main additive element, mass fraction of other elements".

For example: HPb59-1 means that the mass fraction of copper is 59%, the mass fraction of lead with main positive elements is 1%, the remaining is zinc lead brass.

Due to the different zinc content in copper, the mechanical properties of yellow copper are also different. The mechanical property curve of brass changes with the change of zinc content. For α - brass, both σ B δ increase continuously with the increase of zinc content. For (α, β) brass, the room temperature strength will continue to increase until the zinc content increases to about 45%. If the zinc content is further increased, a brittle R phase (solid solution based on cu5zn8 compound) appears in the alloy structure, the strength decreases sharply. The room temperature ductility of (α, β) brass always decreases with the increase of zinc content. Therefore, the Cu Zn alloy with more than 45% Zn content has no practical value.

Common brass has a wide range of uses, such as water tank belt, water supply drainage pipe, medal, bellows, serpentine pipe, condenser pipe, cartridge case various stamping products small hardware with complex shapes. With the increase of zinc content h63 to H59, they can withstand heat treatment well are widely used in various mechanical electrical parts, stamping parts musical instruments.

In order to improve the corrosion resistance, strength, hardness machinability of brass, a small amount of tin, aluminum, manganese, iron, silicon, nickel, lead other elements (generally 1% ~ 2%, 3% ~ 4%, 5% ~ 6%) are added into the copper zinc alloy to form ternary, Quaternary, even pentagonal alloy, which is also called special brass.

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