Leadless free-cutting tin-magnesium brass alloy

Abstract

The invention relates to a leadless free cutting antimony magnesium brass alloy, belonging to the technical field of brass alloy material manufacture. The brass alloy comprises zinc, copper, tin, magnesium and rare earth; all the ingredients are as follows according to weight proportion: 35.0 to 41.0 percent of zinc, 0.5 to 2.5 percent of tin, 0.2 to 2.0 percent of magnesium, 0.02 to 0.2 percent of rare earth and the balance of copper and impurities with the amount of less than or equal to 0.05 percent and the total amount of the weight proportion of all the ingredients is 100 percent; any or more than one mixtures of silicon, phosphorus, aluminum, manganese, boron and iron can be added and the adding amount is not more than 1.0 percent of the total amount of the weight proportion of all the ingredients. The invention has scientific and reasonable compound formulation, utilizes the characteristic that the magnesium and the compound of magnesium and copper are uniformly and dispersively distributed in crystalline and crystal boundary so as to lead the obtained alloy product to have fine crystal grain, high strength as well as good plasticity, has good cutting performance, hot processing performance and excellent corrosion resistant performance and is particularly applicable to the fields of pipe fittings of water heating, bathroom and the like.

Description

technical field [0001] The invention relates to a lead-free free-cutting antimony-magnesium brass alloy, which belongs to the technical field of manufacturing brass alloy materials. Background technique [0002] Lead brass has excellent cold and hot workability, excellent cutting performance and self-lubricating properties, which can meet the machining requirements of various shapes of parts; it is widely used in hardware, watch parts, auto parts, refrigeration equipment, Household appliances and water works, etc. Medical research shows that lead has great damage to human hematopoiesis and nervous system, especially children's kidney and other organs. Therefore, all countries in the world pay attention to the harm and pollution caused by lead, and relevant laws and regulations strictly restrict and prohibit the use of lead brass. The key technology for the research and development of lead-free brass is to use other elements to replace lead to solve the contradiction betwee...

AI Technical Summary

Problems solved by technology

[0003] However, the cutting performance of these products is still inferior to ordinary lead brass, and the corrosion resistance and cold / hot processing performance need to be further explored. It is necessary to further improve the overall performance of the alloy, reduce costs, and achieve the purpose of replacing lead brass.

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