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Heat treatment method of unleaded brass alloy

a technology of unleaded brass and treatment method, which is applied in the field of unleaded brass alloy heat treatment method, can solve the problems of poor mechanical processability, affecting the human body and environment, and affecting the human body and environment, and achieves excellent mechanical processability, improved processability, and anti-corrosion property and wear resistance.

Inactive Publication Date: 2013-10-03
ASIA UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent is about a heat treatment method for unleaded brass alloy that improves its mechanical processability, anti-corrosive property, wear resistance and cracking with time without adding any harmful ingredient. The method involves full annealing to remove internal stress and boundary cracking, soft annealing to remove stress concentration caused by mechanical processing and residual stress, and forging after full annealing to remove stress and boundary cracking caused by external force applied during the process.

Problems solved by technology

When preparing lead-containing copper alloy, several dangerous factors always exist since such alloy contains lead that adversely affects the human body and environment.
Meanwhile, brass alloy (unleaded brass alloy) containing no lead that adversely affects the human body and environment may show poor mechanical processability.
Although such alloy provides copper alloy with improved mechanical processability (machinability) through the use of a silicon (Si) additive, it shows larger cutting resistance than lead-containing brass alloy because Si is softer than copper or lead, and tools using such alloy have low service life.
In addition, unleaded brass alloy itself has poor processability, and thus the alloy is merely applied to casting.
Therefore, the alloy as-produced may not be applied to some products, such as piping fittings, required to be processed into various shapes.
However, since bismuth is expensive and causes cracking during low-temperature processing due to its brittleness, production of articles using such bismuth-containing alloy is not cost-efficient and the resultant articles are limited in application.

Method used

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  • Heat treatment method of unleaded brass alloy
  • Heat treatment method of unleaded brass alloy
  • Heat treatment method of unleaded brass alloy

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Embodiment Construction

[0023]Exemplary embodiments now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown.

[0024]As used herein, the term ‘unleaded brass alloy’ means brass alloy containing no lead or containing a very small amount of lead.

[0025]In the following embodiments, naval brass may be used as an unleaded brass alloy material.

[0026]FIG. 1 is a diagram illustrating the heat treatment method according to an embodiment. As shown in FIG. 1, the heat treatment method includes an operation S1 of full annealing an unleaded brass alloy material, an operation S2 of mechanical processing the material after the operation S1, and an operation S3 of soft annealing the material after the operation S2.

[0027]In the operation S1, the material is subjected to full annealing at a temperature of 530±30° C. for 3 hours. Such full annealing improves the mechanical processability of the material and removes boundary cracking caused by stress conc...

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Abstract

A heat treatment method for unleaded brass alloy is provided to improve processability, cracking resistance, wear resistance and anti-corrosive property of unleaded brass alloy containing no lead or containing a very small amount of lead. The heat treatment method includes full annealing an unleaded brass alloy material, mechanical processing the material after full annealing and soft annealing the material after mechanical processing.

Description

FIELD OF THE INVENTION[0001]The present disclosure relates to a heat treatment method for unleaded brass alloy. More particularly, the present disclosure relates to a heat treatment method for unleaded brass alloy, intended to improve processability, cracking resistance, wear resistance and anti-corrosive property of unleaded brass alloy containing no lead or containing a very small amount of lead.BACKGROUND OF THE INVENTION[0002]In general, copper alloy is used widely in automobile parts, electronic parts, piping members (faucet metallic parts, valves, etc.), or the like, and is required to have excellent mechanical processability and anti-corrosive (anti-dezincification) property with time.[0003]It is known that addition of lead is effective for improving mechanical processability and anti-corrosive (anti-dezincification) property of copper alloy.[0004]When preparing lead-containing copper alloy, several dangerous factors always exist since such alloy contains lead that adversely ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22F1/08
CPCC22F1/08
Inventor PARK, KWANG JINSHIM, JAE KILHAN, YOUNG SYYOON, KYUNG HWANAHN, SUNG KI
Owner ASIA UNION
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