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High-zinc leadless brass alloy and preparation method thereof

A zinc-lead-free brass and alloy technology, applied in the field of high-zinc lead-free brass alloy and its preparation, and environmentally friendly green metal materials, can solve the problems of difficult to obtain wide promotion and application, high cost, etc., and achieve excellent cooling and heating Processability, low cost, and the effect of improving mechanical properties

Inactive Publication Date: 2012-07-11
江西九星铜业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw material cost of lead-free bismuth brass is much higher than that of lead brass, so it can only be demanded in the lead brass market with high environmental protection requirements, making it difficult to obtain wide promotion and application

Method used

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  • High-zinc leadless brass alloy and preparation method thereof
  • High-zinc leadless brass alloy and preparation method thereof
  • High-zinc leadless brass alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the alloy composition described in Table 1, the copper-zinc alloy is smelted first, and the smelting temperature is 1170 ° C. After it is completely melted, add graphite and copper-titanium intermediate alloy and stir evenly. After standing for 12 minutes, add aluminum, Master alloys of boron, arsenic, iron, manganese, and rare earth elements, wherein aluminum, arsenic, iron, and rare earth elements are added in the form of zinc master alloys, and boron and manganese are added in copper master alloys. In the master alloys, copper or zinc The mass fractions are all 80-90%. The slag is removed by stirring, and the gravity casting is adopted after spraying fire, the casting temperature is 1070°C, and the casting speed is 1mm / s to prepare alloy ingots.

[0036] During smelting, the covering agent is graphite and glass with a mixing weight ratio of 1.25:1.

[0037] Table 1 High-zinc lead-free brass alloy composition (wt%) of the present invention

[0038]

...

Embodiment 2

[0042] According to the alloy composition described in Table 2, the copper-zinc alloy is smelted first, and the smelting temperature is 1210°C. After it is completely melted, add graphite and copper-titanium intermediate alloy and stir evenly. After standing for 13 minutes, add aluminum, Master alloys of boron, arsenic, iron, manganese, and rare earth elements, wherein aluminum, arsenic, iron, and rare earth elements are added in the form of zinc master alloys, and boron and manganese are added in copper master alloys. In the master alloys, copper or zinc The mass fractions are all 80-90%. Stir and remove slag, and then use gravity casting after spraying fire, the casting temperature is 1080°C, the casting speed is 1.3mm / s, and an alloy ingot with a diameter of 170mm is prepared.

[0043] During smelting, the covering agent is graphite and glass with a mixing weight ratio of 1.50:1.

[0044] Table 2 High-zinc lead-free brass alloy composition (wt%) of the present invention

...

Embodiment 3

[0049] According to the alloy composition described in Table 3, the copper-zinc alloy is smelted first, and the smelting temperature is 1190 ° C. After it is completely melted, add graphite and copper-titanium intermediate alloy and stir evenly. After standing for 14 minutes, add aluminum, Master alloys of boron, arsenic, iron, manganese, and rare earth elements, wherein aluminum, arsenic, iron, and rare earth elements are added in the form of zinc master alloys, and boron and manganese are added in copper master alloys. In the master alloys, copper or zinc The mass fractions are all 80-90%. Stir and remove slag, and then use gravity casting after spraying fire, the casting temperature is 1100°C, and the casting speed is 1.5mm / s to prepare square ingots.

[0050] During smelting, the covering agent is graphite and glass with a mixing weight ratio of 2.2:1.5.

[0051] Table 3 High-zinc lead-free brass alloy composition (wt%) of the present invention

[0052]

[0053] In th...

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Abstract

The invention relates to the field of leadless brass alloy and especially to an easily-cuttable corrosion-resistant high-zinc leadless brass alloy and a preparation method thereof. The alloy can be used to substitute machined lead brass alloy and is an excellent environment-friendly green metal material. The alloy comprises 57 to 63% of copper, 1 to 1 .5% of graphite, 0.05 to 2% of titanium, 0.001 to 0 .05% of aluminum, 0.001 to 0 .05% of boron, 0.02 to 0.06% of arsenic, 0.2 to 0.5% of iron, 0.1 to 0 .2% manganese and 0.001 to 0.07% of a rare earth element RE, with the balance being zinc. During melting, copper zinc alloy is melted at first, graphite and copper titanium intermediate alloy are added after copper zinc alloy is completely molten and are uniformly mixed with molten copper zinc alloy under stirring, then intermediate alloy of aluminum, boron, arsenic, iron, manganese and the rare earth element are sequentially added, stirring and slag removal are carried out, and gravity casting is carried out on an obtained mixture after flaming so as to prepare alloy cast ingots. According to the invention, graphite is added into the high-zinc leadless brass alloy to substitute lead,which enables the high-zinc leadless brass alloy to cost less compared to bismuth brass, the disadvantages of cracks, inclusion and the like of castings to be reduced, brass crystal grains to be refined and the high-zinc leadless brass alloy to have excellent hot and cold processing performances.

Description

technical field [0001] The invention relates to the field of lead-free brass alloys, in particular to an easy-to-cut, corrosion-resistant high-zinc lead-free brass alloy and a preparation method thereof. The alloy is suitable for replacing mechanically processed lead-free brass alloys and is an excellent Environmentally friendly green metal material. Background technique [0002] With the extensive use of lead-containing products, the harm of lead to human beings has become increasingly apparent. Lead poisoning and lead pollution have become social problems that people generally pay attention to. The free-cutting brass commonly used in traditional industries is leaded brass (mostly HPb59-1, etc.), because leaded brass has excellent cold and hot processing performance, excellent cutting performance and self-lubricating characteristics, it can meet Machining of parts of various shapes, so leaded brass is recognized as an important basic material in the world, and widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04C22C1/03
Inventor 李文君刘刚王瑛
Owner 江西九星铜业有限公司
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