Explanation

Tin brass is a kind of alloy added tin on the basis of copper zinc alloy. The main function of tin is to inhibit the precipitation of zinc, so as to improve the corrosion resistance of brass and make it corrosion resistant in both fresh water and sea water. Therefore, it is widely known as naval brass. In alloy, a small amount of tin can be dissolved in α (alpha) and (alpha+beta) brass, which can improve the strength and hardness of brass. Generally, the content of tin is about 1%. However, if the tin content is too high, it may reduce the plasticity of alloy. According to the proportion of zinc in alloy, tin brass can be divided into α Type and (alpha+beta) type. The common alloy is 70Cu-29Zn-1Sn, which belongs to single-phase α tin bras has excellent mechanical properties. In the soft state, its tensile strength reaches 350MPa and elongation is 60%. This alloy is suitable for cold working, hot rolling and hot extrusion, but not for hot stamping and hot forging. In addition, the addition of trace arsenic in 70Cu-29Zn-1Sn alloy can inhibit dezincification corrosion and further improve the corrosion resistance of alloy. This alloy is widely used in high-strength corrosion resistant condenser tubes for ships and thermal power plants. However, it should be noted that this alloy has the tendency of stress corrosion fracture, so the low temperature annealing treatment of stress relief is required when manufacturing cold working tube. The typical alloy composition of (alpha+beta) tin bras is 62Cu-37Zn-1Sn, which has excellent mechanical properties. In the soft state, its tensile strength reaches 380MPa and elongation is 40%. This alloy is suitable for hot working and cold working. It is easy to cut, has excellent weld performance, and shows high corrosion resistance in seawater. Therefore, it is suitable for manufacturing ship parts and parts that come into contact with media such as seawater and gasoline.

Classification