Low-lead anti-corrosion forging yellow brass alloy and manufacturing method thereof

Abstract

The invention discloses a low-lead anti-corrosion forging yellow brass alloy and a manufacturing method thereof. The yellow brass alloy comprises the following components in percentage by weight: 60.0 to 62.5 percent of copper, less than or equal to 0.2 percent of lead, less than or equal to 0.2 percent of aluminum, 0.35 to 0.55 percent of bismuth, 0.15 to 0.22 percent of arsenic and the balance of zinc and inevitable impurities. The yellow brass alloy has high corrosion resistance, the concentration of the yellow brass alloy is 1 percent under the condition of eliminating assembly stress without annealing, and the dezincification depth is less than 100 micrometers under the 24-hour corrosion of copper chloride. The yellow brass alloy has high using performance (corrosion resistance, a mechanical property and the like) and high process performance (cold and hot formability, cutting performance, welding performance and the like), and is suitable for all water heating and bathroom parts and equipment for forging and machining production in water heating and bathroom industries.

Description

technical field [0001] The invention relates to a low-lead corrosion-resistant brass alloy for forging and a manufacturing method thereof, in particular to low-lead brass used for forging or direct machining for various plumbing and sanitary parts and equipment in the plumbing and sanitary industry Alloy pipes and bars. Background technique [0002] Because of its excellent cutting performance, good corrosion resistance and low cost, lead brass has been widely used in water supply systems to make faucets, various valves and other components. However, because lead brass will pollute the environment during production and use, and lead is easily leached in water, drinking tap water containing lead for a long time will seriously endanger human health, so its application is strictly controlled. Governments such as the United States, Japan and Europe have legislated to gradually ban the use of lead-containing products in drinking water pipe fittings, and the US NSF / ANSI61-2008 dr...

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Problems solved by technology

[0004] Among them, the cutting performance of bismuth brass is the closest to that of lead brass. A higher content of bismuth is added to the existing bismuth brass to make the cutting performance of the alloy similar to that of lead brass. At the same time, a higher content of tin is added to improve the performance of the alloy. Corrosion resistance, such as bismuth tin brass disclosed by CN1906317A, but because the prices of bismuth and tin are all more expensive, the raw material cost of bismuth brass is higher, and the corrosion resistance of tin is limited, and the concentration that cannot pass is 1%. 24-hour copper chloride dezincification corrosion resistance test

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