Lead-free brass alloy for hot working

Inactive Publication Date: 2014-04-24
JOETABU BRONZ1 CORP
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Benefits of technology

[0019]The present invention is configured in the manner described above, and is therefore a lead-free brass alloy for hot working, provided with good hot-working properties and mechanical characteristics. In other words, adding 28.0 to 35.0 wt % zinc makes it possible to obtain good hot-working properties. In similar fashion to zinc, silicon is an essential element for obtaining good hot-working properties and the addition of 0.5 to 2.0 wt % is effective. Tin contributes to improvement in dezincification decay

Problems solved by technology

However, lead evaporates in the alloy melting and casting process, elutes in

Method used

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  • Lead-free brass alloy for hot working
  • Lead-free brass alloy for hot working
  • Lead-free brass alloy for hot working

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[0043]Preferred embodiments of the present invention are briefly described below while indicating the effects of the present invention.

[0044]In order to obtain good resistance to dezincification and resistance to erosion and corrosion, and to provide good hot-working properties and mechanical characteristics, the present invention provides a lead-free brass alloy for hot working comprising: 28.0 to 35.0 wt % zinc, 0.5 to 2.0 wt % silicon, 0.5 to 1.5 wt % tin, 0.5 to 1.5 wt % bismuth, 0.10 wt % or less lead, and the remainder being copper and unavoidable impurities, wherein the zinc equivalent is in a range of 40.0 to 43.0.

[0045]The component composition as described above in the present invention, the reasons for specifying the mechanical characteristics, and the effects of the present invention will be briefly described below.

[0046]Zinc (Zn)

[0047]Zinc dissolves in the matrix of a Cu—Zn—Si copper alloy, and has the effect of increasing mechanical strength. Zinc also reduces the melt...

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Abstract

Provided is a lead-free brass alloy for hot working provided with good hot-working properties and mechanical characteristics. A lead-free brass alloy for hot working, comprising: 28.0 to 35.0 wt % zinc, 0.5 to 2.0 wt % silicon, 0.5 to 1.5 wt % tin, 0.5 to 1.5 wt % bismuth, 0.10 wt % or less lead, and the remainder being copper and unavoidable impurities, the zinc equivalent being in a range of 40.0 to 43.0, and the area ratio of the κ phase after hot working being 20% or less.

Description

TECHNICAL FIELD[0001]The present invention relates to a lead-free brass alloy for hot working, having excellent resistance to dezincification and resistance to erosion and corrosion, and having good hot-working properties and mechanical characteristics.BACKGROUND ART[0002]Bronze, brass, and other copper alloys have conventionally been used in faucet parts for water supply, water contact parts for general piping, and in various valves in order to make use the excellent material characteristics of such alloys. These copper alloys require good machinability for working a product, and therefore lead has generally been included to thereby impart the required machinability. For example, JIS H5120 CAC406, CAC407, and other bronze alloys, and JIS H3250 C3604, C3771, and other brass alloys having excellent machinability contain 1 to 6 wt % of lead.[0003]However, lead evaporates in the alloy melting and casting process, elutes into drinking water when used as a water contact part, and has oth...

Claims

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Application Information

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IPC IPC(8): C22C9/04
CPCC22C9/04C22F1/00C22F1/08
Inventor YAMAMOTO, HIDEKIHOSHINO, TAGAYASUNAKAJIMA, KATSUYUKIUENO, MAKOTOMATSUHASHI, TETSUYA
Owner JOETABU BRONZ1 CORP
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