Leadless and free-cutting phosphorus-brass alloy and manufacturing method thereof

Abstract

The invention provides a lead-free cutting-free alloy and a preparation method thereof. The components (weight percentage) of the alloy are: more than 97.0 but not equal to 99.5 of (copper + zinc), more than 35.0 of zinc, 0.4-1.6 of phosphor and 0.005-0.6 of at least two other elements selected from aluminum, silicon, antimony, stannum, lanthanon, titanium and boron, the balance being zinc and impurities, wherein, the zinc content is more than 35.0 (weight percentage). The invention also provides a preparation method for the lead-free cutting-free high phosphor brass alloy. The alloy of the invention has excellent machinability, castibility, welding property, dezincification corrosion resisting property, formability and mechanical property, and is particularly suitable for forged pieces and low-pressure cast castings needing cutting processing, grinding processing (polish), welding and plating, such as hydrants, valve bodies and bushings in a water supply system.

Description

technical field [0001] The invention relates to a phosphor brass alloy, in particular to a lead-free free-cutting phosphor brass alloy suitable for water supply system forgings or castings and a manufacturing method thereof. Background technique [0002] Lead-containing brass alloy materials are still widely used as structural materials for many products because of their excellent cutting properties, hot and cold forming properties, and low production costs. However, during the production and use of lead brass, lead will pollute the environment and cause harm to the human body, which has attracted people's attention. Therefore, the application of lead-containing materials, including lead brass, is increasingly restricted. . In order to meet this challenge, in recent years, domestic and foreign countries have actively researched and developed lead-free free-cutting brass alloys. The bismuth brass and tellurium brass that have been researched and developed are the two lead-f...

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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, especially the pollution problem of lead to the environment, the present invention is based on the fact that the solid solubility of phosphorus in copper decreases rapidly with the decrease of temperature and forms a brittle intermetallic compound Cu with copper. 3 The characteristics of P, phosphorus is selected as the main alloying element to ensure that the alloy has excellent cutting performance

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