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Low-lead brass alloy for plumbing member

A technology of water pipe parts and lead brass, which is applied in the field of water pipe parts materials, can solve problems such as dezincification corrosion and insufficient elongation, and achieve the effects of improving reusability, ensuring machinability, and ensuring safety

Inactive Publication Date: 2016-11-09
KURIMOTO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] The alloys of Patent Documents 5 and 6 contain a large amount of Zn, so there are problems in that the elongation tends to be insufficient and dezincification corrosion tends to occur.

Method used

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  • Low-lead brass alloy for plumbing member
  • Low-lead brass alloy for plumbing member
  • Low-lead brass alloy for plumbing member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0065] Hereinafter, an example of actually producing the brass alloy according to the present invention will be given and reported. First, a test method performed on a brass alloy will be described.

[0066]

[0067] will use The samples casted by molds were processed into No. 14A test pieces specified in JIS Z2241. The specific shape is as figure 1 shown. is the original cross-sectional area S of a parallel part 0 The distance from the original mark L 0 Exist L 0 =5.65×S 0 ^(1 / 2) ratio test piece. Make the diameter d of the rod 0 4mm, so that the original mark distance L 0 20mm, so that the cylindrical parallel section length L c is 30mm, so that the radius R of the shoulder is 15mm. (L 0 =5.65×(2×2×π)^(1 / 2)=20.04)

[0068] About this test piece, the tensile test was implemented based on JISZ2241, and the tensile strength (MPa), 0.2% proof strength (MPa), and elongation (%) were evaluated as follows. It should be noted that the tensile strength is the maximum...

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Abstract

This invention addresses the problem of obtaining a brass alloy that resists erosion and corrosion and excels in terms of the mechanical properties possessed by plumbing members while minimizing the bismuth content of the brass alloy, ensuring recyclability, without compromising the dezincification-corrosion resistance that is required of a plumbing member. This brass alloy contains, by mass, 24-34% of zinc, 0.5-1.7% of tin, 0.4-1.8% of aluminum, 0.005-0.2% of phosphorus, and 0.01-0.25% of lead, with the remainder comprising copper and unavoidable impurities. If the mass percentage of tin is less than 1.0%, then the mass percentages of aluminum and tin (Al and Sn) satisfy the relation Al + 2*Sn >= 2.8.

Description

technical field [0001] The present invention relates to materials suitable for water pipe components made of brass alloys and having corrosion-corrosion resistance. Background technique [0002] At present, JIS H5120 brass castings CAC203 used in water pipe-related parts such as faucet metal fittings contain 0.5 to 3.0% by mass of lead. limit. Therefore, in order to reduce the harmful influence of lead, production of copper alloys with reduced lead content has been studied. [0003] However, if the lead content is simply reduced, the castability, machinability, and pressure resistance of the copper alloy will be reduced, resulting in water leakage when used in a valve, for example. In order to compensate for such a change in properties due to the reduction of lead, studies are underway to improve machinability, dezincification resistance, and pressure resistance by adding Bi. [0004] For example, the following patent document 1 describes a brass alloy containing 0.4 to 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04
CPCC22C9/04
Inventor 山田浩士山本匡昭宫本武明松叶昌平
Owner KURIMOTO LTD