Lead-free and silicon-free brass alloy and manufacturing method thereof

Abstract

The invention provides a lead-free and silicon-free brass alloy and a manufacturing method thereof. The brass alloy comprises 60-63 wt.% of Cu, 0.6-0.8 wt.% of Si, 0.05-0.15 wt.% of Pb, 0.2-0.5 wt.% of Al, 0-0.3 wt.% of Sn, 0-0.1 wt.% of Ni, 0.02-0.1 wt.% of Fe, 0.0002-0.0010 wt.% B, and the balance of Zn and inevitable impurities, wherein the total content of Cu and Zn is higher than 97.0 wt.%. The lead-free and silicon-free brass alloy is excellent in comprehensive property, in particular, excellent in polishing property, and in particular, suitable for water heating and bathroom parts molded by sand casting and low-pressure casting methods.

Description

Technical field [0001] The invention belongs to the technical field of alloys, and specifically relates to an environmentally friendly lead-free silicon brass alloy and a manufacturing method thereof. Background technique [0002] Lead brass contains 1wt.%-4wt.% of lead. Lead brass has excellent cutting performance, good corrosion resistance, and low cost. It has been used as an important basic material for electrical, machinery, plumbing, etc. each field. However, lead-containing brass will pollute the environment during production and use, and endanger human health. The United States, the European Union, Australia and other developed countries and regions have successively formulated standards and regulations, such as NSF-ANSI372, NSF-ANSI61, AB-1953, RoHS, AS / NZS 4020, etc., gradually banning the production, sale and use of lead-containing products. my country's GB / T 18145-2014 "Ceramic Sealed Faucet" also stipulates that the amount of lead precipitation in drinking water pa...

AI Technical Summary

Problems solved by technology

[0004] A kind of phosphorus-containing free-cutting silicon brass alloy is disclosed in CN104480344A, but according to the record in "Copper Alloy and Its Processing Handbook" (Tian Rongzhang, edited by Wang Zhutang, published by Central South University Press), when the phosphorus content in the brass is greater than 0.05%, , will form a brittle Cu 3 P 7 Reduced Brass Machinability

In CN104651660A and CN105950905A, the casting processing performance and dezincification resistance of the obtained silicon brass alloy were tested, and the results showed that these properties were close to or better than lead brass, but the obtained silicon yellow was not tested in these two patents. Copper Polishing Properties

After testing the silicon brass described in these two patents, the inventors of the present application found that there are hard spots on these silicon brass, and the polishing performance is not satisfactory

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