A kind of environment-friendly brass alloy with excellent formability and its manufacturing method

Abstract

The invention relates to good-formability environment-friendly brass alloy and a manufacturing method thereof. The brass alloy contains 35wt% or more of Zn, 0.1-1.0wt% of Si, 0.01- 0.28wt% of Mn, and the balance Cu and inevitable impurities. The brass alloy has good cold processing formability, hot processing formability, castability, anti-dezincification-corrosion performance, excellent polishing performance and welding performance, and is suitable for parts, of bathroom plumbing, electric products, automobiles and the like, used for forging, casting and direct processing.

Description

technical field [0001] The invention belongs to the technical field of alloys, in particular to an environment-friendly brass alloy, in particular to an environment-friendly brass alloy with excellent thermoforming performance and casting performance and a manufacturing method thereof. Background technique [0002] Leaded brass usually contains 1wt%-4wt% lead, which enables it to obtain excellent cutting performance, good corrosion resistance, and low cost. Lead brass has been used as an important basic material in various fields such as electrical, mechanical, plumbing and so on. However, leaded brass will pollute the environment and endanger human health in the process of production and use. The United States, the European Union and other developed countries and regions have successively formulated standards and laws, such as S.3874, NSF 372, AB1953, RoHS, etc., gradually prohibiting the production, sale and use of lead-containing products. [0003] At present, a lot of ...

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Problems solved by technology

Most of the published silicon brass patents improve the cutting performance of the alloy by adding 0.1-5.0wt% bismuth or 0.1-3.0wt% antimony or 0.01-3.0wt% magnesium, such as Chinese patent application 200610005689.2, 200910042723.7, 200810084184.9, but because the welding performance and thermoforming performance of the product become worse after adding bismuth to the alloy, the leading products produced by the brass alloy with antimony added exceed the standard of antimony element in the NSF test. In addition, because magnesium is easy to oxidize and form slag After adding magnesium to silicon brass, the fluidity of the alloy will be significantly reduced and a large amount of oxidized slag will be generated, which will cause the alloy to be prone to cracks during hot working or casting, and there are a large number of material points and cracks on the surface of the product after polishing

[0007] In addition to the research and development of the above types of lead-based brass, the more commonly used lead-free copper in the market is simple brass, such as CuZn40, which reduces the lead content on the basis of C36000, that is, Cu, Zn and a small amount of Pb (less than 0.25wt %), the cost is lower, but the hot forming and casting properties are poor, and the cutting process is difficult

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