Leadless free-cutting magnesium silicon brass

A free-cutting, brass technology, applied in the field of metal materials, can solve the problems of lead brass polluting the environment, brass composition, poor processing performance, etc., and achieve the effects of simple cleaning, low cost, and wide sources.

Inactive Publication Date: 2009-07-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to effectively solve the problems of lead brass polluting the environment, the high content of bismuth brass and poor processing performance, etc., and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The composition of lead-free free-cutting brass is copper (Cu) 58.0%, magnesium (Mg) 1.0%, silicon (Si) 0.2%, aluminum (Al) 0.3%, the total amount of impurities is not more than 0.05%, and the balance is zinc ( Zn). Considering the market price of each element and the production process for cost accounting, the alloy price is equivalent to 99% of HPb59-1, far lower than bismuth brass, the cutting performance is equivalent to 88%, good thermoplasticity (hot extrusion ratio is 85), no Cold and brittle phenomenon appears.

[0016] Implementation example 2:

[0017] The composition of lead-free free-cutting brass is copper (Cu) 58.0%, magnesium (Mg) 0.5%, silicon (Si) 3.5%, aluminum (Al) 0.6%, the total amount of impurities is not more than 0.05%, and the balance is zinc ( Zn). Considering the market price of each element and the production process for cost accounting, the price of the alloy is equivalent to 99% of HPb59-1, which is far lower than that of bismuth brass. ...

Embodiment 3

[0019] The composition of lead-free free-cutting brass is copper (Cu) 80.0%, magnesium (Mg) 2.4%, silicon (Si) 0.6%, aluminum (Al) 0.5%, the total amount of impurities is not more than 0.05%, and the balance is zinc ( Zn). Considering the market price of each element and the production process for cost accounting, the alloy price is equivalent to 111% of HPb59-1, far lower than bismuth brass, the cutting performance is equivalent to 93%, and the thermoplasticity is good (the hot extrusion ratio is 95). Cold and brittle phenomenon appears.

Embodiment 4

[0021] The composition of lead-free free-cutting brass is copper (Cu) 80.0%, magnesium (Mg) 2.0%, silicon (Si) 1.2%, aluminum (Al) 0.5%, the total amount of impurities is not more than 0.05%, and the balance is zinc ( Zn). Considering the market price of each element and the production process for cost accounting, the alloy price is equivalent to 110% of HPb59-1, which is far lower than that of bismuth brass. The cutting performance is equivalent to 90%, and the thermoplasticity is good (hot extrusion ratio is 92). Cold and brittle phenomenon appears.

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PUM

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Abstract

The invention discloses a lead-free easy-cutting magnesium silicon brass, belonging to the manufacturing technology field of metal materials. The components of the brass comprise alloying elements, such as copper, zinc, silicon, magnesium, aluminum and the like, and the mass fractions of the elements are as follows: 58.0 percent to 80.0 percent of copper, 0.2 percent to 3.5 percent of magnesium, 0.2 percent to 3.5 percent of silicon and 0 to 0.6 percent of aluminum. The sum of the mass fractions of silicon and magnesium is 1.2 percent to 4.0 percent, the impurity amount is not more than 0.05 percent and the balance is zinc. The lead-free easy-cutting magnesium silicon brass is developed on the basis of the existing easy-cutting lead brass and Bi brass and aiming at the demand of brass parts for cutting process and the application environment of finished products. According to the demand for products containing lead at home and abroad, the lead brass is forced to be replaced by lead-free products. The magnesium silicon brass uses silicon and magnesium to replace lead, realizing the purpose of lead-free easy-cutting lead brass. The brass has good cutting and processing properties, has no cold shortness and hot shortness phenomena, can be used in fields, such as electrics and electronics, bathroom wares, toy devices and the like and can replace the existing easy-cutting lead brass and lead-free easy-cutting Bi brass.

Description

technical field [0001] The invention is a metal material, especially a lead-free free-cutting magnesium-silicon brass. Background technique [0002] Lead-containing copper alloy has the properties of easy cutting and physical, chemical and mechanical properties, and is a kind of copper alloy widely used. my country's lead brass output is about 2 million tons per year, plus the unstated parts of township enterprises and small private enterprises, the amount of lead brass put into the society is far more than this statistical tonnage. Widely used in water heating and sanitary ware, electrical and electronic, instrumentation, clocks and toys and other industries. After these lead-brass components are scrapped, some are recycled, but a large proportion, especially small parts, are often discarded as garbage. Lead brass will cause environmental pollution and endanger human health in the process of production, use and recycling, so its application is increasingly restricted. Si...

Claims

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Application Information

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IPC IPC(8): C22C9/04
Inventor 黄劲松周忠诚
Owner CENT SOUTH UNIV
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