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 cast bronze series in heavy non-ferrous metal materials. Commonly used cast bronzes are tin bronze plate, lead bronze, manganese bronze and aluminum bronze. The volume shrinkage of Cu-Sn alloy is very small (the linear shrinkage rate is 1.45% to 1.5%), and it is easy to produce complex castings and handicrafts with clear patterns that require accurate dimensions.
Casting tin bronze generally also adds zinc, lead, phosphorus and other elements. Phosphide has high hardness, wear resistance, and good abrasiveness. 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 reverse segregation tendency of tin bronze. Lead significantly improves the wear resistance and machinability of the alloy. Cast tin bronze is used as wear and corrosion resistant parts.
Tin Phosphor Bronze: Phosphorus is a good deoxidizer for copper alloys, which can increase the fluidity of the alloy, improve the technological 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 too much, it will form α+δ+Cu3P ternary eutectic, the melting point is 628 ℃, it is easy to produce hot brittleness during hot rolling, so it 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, modulus of elasticity and fatigue strength of the fine-grained material are higher than those of the coarse-grained material, but the plasticity is lower.
Cold-worked materials are annealed at 200-260 °C for 1-2 hours at low temperature, resulting in annealing and hardening effect, which can further improve the strength, plasticity, elastic limit and elastic modulus of the product, and increase the stability of elasticity. Tin-zinc bronze: A large amount of zinc is dissolved in copper-tin alloy, and the addition amount of zinc in deformed tin bronze is generally not more than 4%. Zinc can improve the fluidity of the alloy, narrow the crystallization temperature range, and reduce reverse segregation.
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