Easily-cut silicon brass alloy and preparation method thereof

Abstract

The invention discloses an easily-cut silicon brass alloy and a preparation method thereof. Chemical components of the silicon brass alloy include 59.2-63.5wt% of copper, 0.35-0.9wt% of silicon, 0.04-0.25wt% of lead and 0.22-0.38wt% of phosphor, other elements account for 0.005-1.1wt%, and the rest include zinc and inevitable impurities, wherein, the total amount of the copper, the zinc, the silicon, the lead and the phosphor is larger than 98.7wt%, and the other elements include at least one element selected from a group consisting of tin, nickel, iron, stibium and manganese. The preparationmethod is as follows: a method for alloying and for purifying and refining a covered and protected alterative scarfing cinder is adopted for smelting the easily-cut silicon brass alloy, then intermediate heat treatment is carried out at a temperature of 560-660 DEG C after coldworking with a working rate ranging from 4 percent to 25 percent, and a final finished product resulting from the workingundergoes stress relief annealing at a low temperature of 380 DEG C. The invention has the advantage that the easily-cut silicon brass alloy has high tensile strength, excellent thermal formability, dezincing resistance, safe and sanitary performance and remarkable excellent cutting performance; meanwhile, the preparation process of the easily-cut silicon brass alloy is simple, the cost is low, and the easily-cut silicon brass alloy can be easily recycled.

Description

technical field [0001] The invention relates to a brass alloy, in particular to a free-cutting silicon brass alloy with high tensile strength, excellent thermoforming performance, dezincification resistance performance, hygienic safety performance and cutting performance and a manufacturing method thereof. Background technique [0002] For a long time, lead brass has been widely used in the machining and cutting manufacturing industry of various industrial sectors because of its good cutting performance, excellent cold and hot processing performance, and can meet the machining of various shapes of spare parts. The world is recognized as an important basic raw material. [0003] However, in recent years, medical experts from all over the world have found that lead poses a hazard to human health and the ecological environment. Therefore, governments of various countries have imposed strict restrictions on the lead content in copper alloys in different fields, and have continuo...

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Problems solved by technology

For example, the patent number of Kohler Corporation of the United States is: CN94192613.3 "low-lead bismuth-containing brass", because although the alloy is low-lead, the bismuth content will affect its future use

The patent application number of China Ningbo Powerway Group is: 200710070803.4 "A low-lead-boron free-cutting antimony brass alloy and its manufacturing method". Although it is a low-lead and environmentally friendly free-cutting brass, the content of antimony is: 0.4-1.2wt%, high antimony content, when used in drinking water projects, its welded joints will cause the possibility that the leaching of antimony will exceed the hygienic and safety performance requirements.

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