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Tin bronze pump body casting have a small volumetric shrinkage
- Jun 29, 2018 -

Tin bronze pump body casting mainly referred to tin bronze, and later because of its use of a variety of alloying elements, to a certain extent, there was a new type of bronze other than tin bronze, such as aluminum bronze, silicon bronze, manganese bronze, chrome bronze, Bronze and lead bronzes.

The volumetric shrinkage of alloys of tin-bronze pump castings is very small. In the course of operation, it is easy to produce complex castings and patterns with clear dimensions. In general, tin bronze, lead, and phosphorus are added to cast bronze. Phosphides have high hardness, wear resistance, and good abrasiveness. In wear-resistant tin bronze, phosphorus content can be as high as 1.2%. Zinc can improve the fluidity of the alloy and reduce the anti-segregation tendency of tin bronze. Lead significantly improves the wear resistance and machinability of the alloy. Cast bronze is used as a wear and corrosion resistant part.

Phosphorus is a good deoxidizer for copper alloys in tin bronze pum castings. When used, it can effectively increase the fluidity of the alloy, so that it can improve its tin bronze process and mechanical properties, but increase the degree of reverse segregation. The ultimate solubility of phosphorus in tin bronze is 0.15% and the melting point is 628°C. Hot brittleness easily occurs during hot rolling and only cold working is possible.

Therefore, the amount of phosphorus in the deformed tin bronze should not be greater than 0.5%, and during thermal processing, the phosphorus should be less than 0.25%. Phosphorus-containing bronze is a well-known elastic material. During processing, it is necessary to control the grain size before cold working and low-temperature annealing after processing. Fine grain processed wood has higher strength, elastic modulus and fatigue strength than its coarse grain processed material, but its plasticity is low.

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