A kind of environment-friendly brass alloy for casting and its manufacturing method

Abstract

Disclosed are an environmentally friendly brass alloy for casting and a manufacturing method therefor. The brass alloy is free of the elements selenium, tellurium, antimony, phosphorus, magnesium and manganese, and the components thereof are: 58-61.5 wt.% of Cu, ≤ 0.25 wt.% of Pb, 0.5-0.8 wt.% of Al, < 0.1 wt.% of Sn, < 0.1 wt.% of Ni, 0.02-0.15 wt.% of Fe, and 5-12 ppm of B, with the balance being Zn and inevitable impurities. In addition to excellent polishing performance and hot tearing resistance performance, the brass alloy has good comprehensive performance, and is suitable for casting formed bathroom plumbing parts.

Description

technical field [0001] The invention belongs to the field of alloy technology, and specifically relates to a lead-free environment-friendly brass alloy for casting which is different from bismuth brass, silicon brass and arsenic brass and does not contain selenium, tellurium, antimony, phosphorus, magnesium and manganese elements and its method of manufacture. Background technique [0002] Lead brass contains 1wt.%-4wt.% lead. Because of its excellent cutting and forming properties and low cost, it is widely used in various fields such as electrical, mechanical, and plumbing. However, because lead brass will pollute the environment and endanger human health in the process of production and use, the United States, the European Union, Japan and other developed countries and regions have successively formulated lead-free standards and laws, such as NSF-ANSI61, NSF-ANSI372, AB-1953, RoHS, etc. Among them, the U.S. AB-1953 defines "lead-free" as the Pb content not exceeding 0.2...

AI Technical Summary

Problems solved by technology

Bismuth brass is prone to hot cracks during the molding process due to its Bi content, and its welding performance is poor, and because bismuth will be associated with lead during the mining process, polluting the environment, so bismuth brass has not been accepted by the European market; Its stress corrosion resistance is poor, and the product is prone to stress corrosion failure during use; while the arsenic brass developed to meet the Australian anti-dezincification requirements AS 2345-2006 (the average dezincification layer depth is not greater than 100μm) has poor alloy fluidity , large shrinkage tendency and high casting defect rate

[0005] Phosphorus, magnesium, and manganese are added to some brass to improve the properties of brass, but the introduction of these elements has brought difficulties in the recycling of waste materials

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