Leadless free-cutting tin-magnesium brass alloy

A brass alloy, easy-cutting technology, applied in the field of lead-free easy-cut antimony-magnesium brass alloy, can solve the problem of inferior cutting performance, and achieve the effect of excellent thermal processing performance, small grain size and good cutting performance

Inactive Publication Date: 2009-05-20
ZHEJIANG KEYU METAL MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the cutting performance of these products is still inferior to ordinary lead brass, and the corrosion resistance and cold / hot processing performance need to be further explored. It is necessary to further improve the overall performance of the alloy, reduce costs, and achieve the purpose of replacing lead brass.

Method used

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  • Leadless free-cutting tin-magnesium brass alloy

Examples

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Embodiment Construction

[0020] Table 1 below compares 16 examples of the present invention with existing conventional leaded brass C3604 and HPb59-1 to further illustrate the superior mechanical properties, corrosion resistance and cutting performance of the present invention.

[0021] The processing technology of the lead-free free-cutting antimony-magnesium brass alloy of the present invention is as follows: during smelting, copper-zinc smelting is first carried out at a temperature of 1050°C to 1250°C, and then copper-magnesium master alloy, antimony and rare earth, and other alloys are added Composition, heat preservation for 10min-40min, semi-continuous casting, casting temperature 1150℃~1200℃, ingot diameter Φ120mm. The ingot is heated at a temperature of 600°C-800°C, the holding time is 30min-90min, and then hot-extruded, extruded into a round bar with a size of Φ25.4mm, and then cold-drawn into a Φ24mm rod with a single-chain horizontal drawing machine. .4mm lead-free antimony-magnesium brass...

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Abstract

The invention relates to a leadless free cutting antimony magnesium brass alloy, belonging to the technical field of brass alloy material manufacture. The brass alloy comprises zinc, copper, tin, magnesium and rare earth; all the ingredients are as follows according to weight proportion: 35.0 to 41.0 percent of zinc, 0.5 to 2.5 percent of tin, 0.2 to 2.0 percent of magnesium, 0.02 to 0.2 percent of rare earth and the balance of copper and impurities with the amount of less than or equal to 0.05 percent and the total amount of the weight proportion of all the ingredients is 100 percent; any or more than one mixtures of silicon, phosphorus, aluminum, manganese, boron and iron can be added and the adding amount is not more than 1.0 percent of the total amount of the weight proportion of all the ingredients. The invention has scientific and reasonable compound formulation, utilizes the characteristic that the magnesium and the compound of magnesium and copper are uniformly and dispersively distributed in crystalline and crystal boundary so as to lead the obtained alloy product to have fine crystal grain, high strength as well as good plasticity, has good cutting performance, hot processing performance and excellent corrosion resistant performance and is particularly applicable to the fields of pipe fittings of water heating, bathroom and the like.

Description

technical field [0001] The invention relates to a lead-free free-cutting antimony-magnesium brass alloy, which belongs to the technical field of manufacturing brass alloy materials. Background technique [0002] Lead brass has excellent cold and hot workability, excellent cutting performance and self-lubricating properties, which can meet the machining requirements of various shapes of parts; it is widely used in hardware, watch parts, auto parts, refrigeration equipment, Household appliances and water works, etc. Medical research shows that lead has great damage to human hematopoiesis and nervous system, especially children's kidney and other organs. Therefore, all countries in the world pay attention to the harm and pollution caused by lead, and relevant laws and regulations strictly restrict and prohibit the use of lead brass. The key technology for the research and development of lead-free brass is to use other elements to replace lead to solve the contradiction betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04
Inventor 李雷姜少军冯焕锋曹建国周何滨冯建欢苏军吕大玲孙刚锋魏连运冯光亮
Owner ZHEJIANG KEYU METAL MATERIALS
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