Manganese-contained free-cutting type silicon brass alloy as well as preparation method and application thereof

Abstract

The invention discloses a manganese-contained free-cutting type silicon brass alloy. The alloy is composed of the following components, by weight percentage, 60.2-64.0wt% of Cu, 1.0-2.0wt% of Si, 0.2-1.0wt% of Al, 0.2-0.48wt% of Mn, 0.1-0.25 wt% of Pb, one or more of P, Mg and Sn, and the balance Zn and not greater than 0.5wt% of impurities, wherein the P accounts for 0.01-0.25wt%, the Mg accountsfor 0.01-0.25wt%, and the Sn accounts for 0.01-0.1wt%. The invention further discloses a preparation method for the alloy. The manganese-contained free-cutting type silicon brass alloy has the advantages of being excellent in dezincification corrosion resistance, good in casting property and cutting property, relatively low in cost and suitable for casting parts of a drinking water system, such as a faucet, a valve, a quick switch.

Description

technical field [0001] The invention relates to a brass alloy, in particular to a manganese-containing free-cutting silicon brass alloy and its preparation method and application. Background technique [0002] Lead brass is widely used in electronics and daily hardware industries because of its good cold and hot forming performance, machinability and corrosion resistance. However, the lead content in lead brass is high, which is easy to precipitate and pollute the environment. Especially when used in the drinking water system, it will cause serious harm to the human body. Countries around the world have successively issued corresponding laws and regulations to strictly limit the lead content in copper alloys. my country's GB / T 18145-2014 "Ceramic Sheet Sealed Faucets" also stipulates that the amount of lead precipitated in drinking water system components should be less than 5μg / L , so developing new brass alloys to reduce lead content while maintaining good processing perfo...

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Problems solved by technology

For example, the Chinese patent No. 94192613.3 "Low Lead Bismuth Brass" applied by Kohler Company of the United States is composed of 55-70wt% Cu, 30-45wt% Zn, 0.2-1.5wt% Bi, 0.2-1.5wt% Al , 0.1 ~ 1.0wt% Pb; the above-mentioned alloys have high Bi content, are prone to hot cracking, and have poor welding performance, so it is difficult for practical application

The published Chinese patent application No. 200580046460.7 "Free-cutting copper alloy containing a very small amount of lead" by Japan's Sambo involves a Cu-Zn-Si brass alloy, which consists of 71.5-78.5wt% Cu, 2.0-4.5wt %Si, 0.005-0.02wt%Pb, and the balance is zinc; the alloy has high Cu content and is expensive, so its market competitiveness is not strong

"Lead-Free Free-cutting Antimony Brass Alloy" invented by Ningbo Powerway Group, its Chinese patent application number is 200410015836.5, consists of 55-65wt% Cu, 0.3-2.0wt% Sb, 0.4-1.6wt% Mn, and other elements are 0.1 ~1.0wt%; the content of antimony in the above-mentioned alloy is relatively high, and its precipitation amount will exceed the limit of 0.6μg / L stipulated in NSF61 and GB / T 18145, so it cannot be popularized and applied in the field of drinking water system

Xiamen Luda's patent No. 201010117783.3 "An Environmentally Friendly Manganese Brass Alloy and Its Manufacturing Method" discloses a Cu-Zn-Mn brass alloy. Due to the high content of manganese, the hardness of the alloy is relatively high. The wear of the tool is serious and the cutting performance is poor, so it is not suitable for mass production

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