The color of tin bronze is a problem that many people will be concerned about, because it affects the price of tin, and the price of tin bronze should be based on the market price of the day. Tin bronze is the dark color of the alloy of red copper, tin and lead. The color of tin bronze is yellowish to blue, so it is also called tin bronze. It has high strength, corrosion resistance and excellent casting performance, and has been widely used in various industrial sectors for a long time. Domestic tin bronze is divided into two grades, QSn4-4-2.5 and QSn4-4-4 according to different chemical compositions.
Tin bronze is a non-ferrous metal alloy with the smallest casting shrinkage rate. It is used to produce castings with complex shapes, clear outlines and low air tightness requirements. Tin bronze is very resistant to corrosion in the atmosphere, sea water, fresh water and steam, and is widely used in steam boilers. And sea ship parts. In addition, Hebei tin bronze has high friction reduction, easy cutting processing, only suitable for cold processing, easy welding and brazing, and good corrosion resistance in the atmosphere and fresh water. Mainly used in parts that bear friction in aviation, automobile, tractor industry and other industries, such as bushings, discs, bushings, etc.
The color deviation of tin bronze has a great influence on its component content and use. Tin bronze will produce severe intragranular (dendrite) segregation during solidification, and homogenization annealing must be carried out before pressure processing. However, due to the slow diffusion of Sn in Cu, multiple homogenization annealing and processing are required to completely eliminate this. Kind of segregation. The β phase is a body-centered cubic lattice. When the alloy is in the α+β phase region at high temperatures, the plasticity is significantly improved. Tin bronze has a greater tendency to reverse segregation.
The tin bronze containing 1%～7%Sn and 20%～25%Sn has very good hot workability. It can be hot rolled at about 600℃ and extruded at 800～850℃. Tin bronze is not sensitive to overheating and gas, and has good solderability. Tin bronze is non-magnetic, has no low-temperature brittleness, has high wear resistance and corrosion resistance, and does not produce sparks when impacted.
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