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Lead does not actually dissolve in brass, was the state of free particles distributed in the grain boundary. Lead brass according to their organizations have α and (α + β) two. α lead brass as a harmful effect of lead larger, high temperature plasticity is very low, so only cold deformation or hot extrusion. (Α + β) lead brass has good ductility at high temperatures for forging.
Tin added to brass, can significantly improve the heat resistance of alloys, especially to improve the resistance to sea water corrosion, it is tin brass, "naval brass," said.
Tin can dissolve into the copper-based solid solution, from the role of solid solution strengthening. However, with the increase of tin content, the brittle r phase (CuZnSn compound) appears in the alloy, which is unfavorable to the plastic deformation of the alloy. Therefore, the content of tin in tin-brass is generally in the range of 0.5% -1.5%.
Common tin brass with HSn70-1, HSn62-1, HSn60-1 and so on. The former is α alloy, with high plasticity, can be cold, hot pressure processing. The latter two grades of alloy have (α + β) two-phase structure, and often appear a small amount of r phase, low plasticity at room temperature, can only be deformed in the hot state.
Manganese in the solid brass have greater solubility. The addition of 1% to 4% manganese to brass can significantly increase the strength and corrosion resistance of the alloy without reducing its ductility.
Manganese brass has (α + β) organization, commonly used HMn58-2, cold and hot state of the pressure processing performance is quite good.