Aluminum brass alloy and preparation method thereof

An aluminum-brass and alloy technology, which is applied in the field of aluminum-brass alloy and its preparation, can solve the problems of leakage of pipes and can not meet the service life requirements of power station condensers, and achieves improved casting performance, improved service life, and refined structure. Effect

Inactive Publication Date: 2012-09-19
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of dezincification, zinc is selectively removed to leave a porous and brittle copper layer and an oxide layer, and the normal brass matrix is ​​gradually replaced by a porous and brittle copper matrix, eventually resulting in pipe breakage
The currently widely used condenser tube alloy HAl77-2 has a service life of about 7-10 years, which is only six to one-seventh of the service life of stainless steel tubes, which is far from meeting the service life requirements of power station condensers and directly leads to fires. The power station condenser is replaced by stainless steel tubes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Put Cu with a mass percentage of 56% into a power frequency furnace for smelting (the balance of copper is brought in through the intermediate alloy), and after the copper starts to soften, a layer of charcoal is covered on the copper surface. The amount of charcoal is 8-10kg per ton of copper. The melting temperature is 1180-1200°C. Add 0.15% Ni by mass percentage to the molten copper liquid to dissolve metallic nickel into the copper liquid through alloying. The temperature of the copper liquid is adjusted to 1180-1200°C, and 23% by mass of Zn is added to the copper liquid to dissolve the metal zinc into the copper liquid through alloying. After the zinc is melted, adjust the temperature of the copper liquid to 1130-1160 ° C, add 20% Cu and 2.1% aluminum to the copper liquid at the same time, and use a large amount of hot melt metal copper cold material released when the aluminum is dissolved . Add Cu-Zr, Cu-Ti and Cu-B intermediate alloys to the copper liquid so t...

Embodiment 2

[0074] Put Cu with a mass percentage of 59% into a power frequency furnace for smelting (the balance of copper is brought in through the intermediate alloy), and after the copper starts to soften, a layer of charcoal is covered on the copper surface. The amount of charcoal is 8-10kg per ton of copper. The melting temperature is 1180-1200°C. 1.2% Ni by mass percentage is added to the molten copper liquid to dissolve metallic nickel into the copper liquid through alloying. The temperature of the copper liquid is adjusted to 1190-1210°C, and 20% by mass of Zn is added to the copper liquid to dissolve the metal zinc into the copper liquid through alloying. After the zinc is melted, adjust the temperature of the copper liquid to between 1130-1160 ° C, add 20% Cu and 2.8% aluminum by mass to the copper liquid at the same time, and use the large amount of hot-melted metal copper cold material released when the aluminum is dissolved . Add Cu-Zr, Cu-Ti and Cu-B intermediate alloys t...

Embodiment 3

[0078] Put Cu with a mass percentage of 56% into a power frequency furnace for smelting (the balance of copper is brought in through the intermediate alloy), and after the copper starts to soften, a layer of charcoal is covered on the copper surface. The amount of charcoal is 8-10kg per ton of copper. The melting temperature is 1180-1200°C. Add 0.10% Ni by mass percentage to the molten copper liquid, so that metallic nickel can be dissolved into the copper liquid through alloying. The temperature of the copper liquid is adjusted to 1180-1200°C, and 23% by mass of Zn is added to the copper liquid to dissolve the metal zinc into the copper liquid through alloying. After the zinc is melted, adjust the temperature of the copper liquid to 1130-1160 ° C, add 20% Cu and 2.1% aluminum to the copper liquid at the same time, and use a large amount of hot melt metal copper cold material released when the aluminum is dissolved . Add the Cu-Fe master alloy to the copper liquid to make t...

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PUM

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Abstract

The invention discloses an aluminum brass alloy and a preparation method thereof. The alloy contains following elements: 76.0-79.0 percent of Cu, 1.8-2.5 percent of Al, 0.02-0.06 percent of As, 0.02-0.06 percent of Ti, 0.02-0.05 percent of Zr, 0.005-0.09 percent of B, 0.05-1.0 percent of Ni, 0.05-0.3 percent of rare earth, not more than 0.05 percent of impurities and the balance of Zn. The preparation method has the advantages that through using a means of trace element alloying, melt of the alloy is purified, an ingot structure of the alloy is thinned, the recrystallization temperature of the alloy is increased, the casting performance, the processing performance, the welding performance and the corrosion resisting performance of the alloy are improved, and the strength, the hardness and the wear resisting performance of the alloy are increased, so the aim of prolonging the service life of the alloy is achieved.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to an aluminum brass alloy and a preparation method thereof. Background technique [0002] HAl77-2 aluminum brass is often used to make condensers, and is widely used as condensers and components for sea-going ships, seaside power stations, thermal power plants, and nuclear power plants. Corrosion resistance is an extremely important performance of this alloy. The nominal zinc content of the alloy is about 20%, and the brass with a zinc content greater than 15% will have obvious stress corrosion under the influence of factors such as residual stress, the medium that causes the selective dissolution of zinc, and the alloy itself is easy to dezincification. tendency to break. The higher the zinc content, the greater the residual stress and the greater the corrosion tendency. Brass dezincification, stress corrosion and impact corrosion are the root causes of alloy c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04C22C1/03
Inventor 贺永东黄伯云
Owner JINCHUAN GROUP LIMITED
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