Tin bronze plate casting is bronze used to produce castings. Bronze castings are widely used in machinery manufacturing, ships, automobiles, construction and other industrial sectors, forming a cast bronze series in heavy non-ferrous metal materials. Commonly used cast bronzes are tin bronze, lead bronze, manganese bronze and aluminum bronze. Cu-Sn alloy has very small volume shrinkage, and it is easy to produce complex castings with accurate dimensions and crafts with clear patterns. Casting tin bronze generally adds elements such as zinc, lead, and phosphorus. Phosphates have high hardness, wear resistance, and good abrasive properties. In wear-resistant tin bronze, the 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 tin bronze is used as wear-resistant and corrosion-resistant parts. Phosphorus is a good deoxidizer for copper alloys, which can increase the fluidity of the alloy, improve the process and mechanical properties of tin bronze, but increase the degree of reverse segregation. The limit solubility of phosphorus in Hebei tin bronze is 0.15%. If it is too much, it will form a ternary eutectic of α+δ+Cu3P, with a melting point of 628℃. It is prone to hot brittleness during hot rolling and can only be cold worked.
Therefore, the phosphorus content in the deformed tin bronze should not be greater than 0.5%, and the phosphorus should be less than 0.25% during hot working. Phosphorus-containing tin 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. The strength, elastic modulus and fatigue strength of fine-grain processed materials are higher than those of coarse-grain processed materials, but the plasticity is lower. The cold-worked material is annealed at a low temperature of 200-260°C for 1 to 2 hours to produce an annealing hardening effect, which can further improve the strength, plasticity, elastic limit and elastic modulus of the product, and increase the stability of elasticity.
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