Low lead alloy

a low-lead alloy, low-lead alloy technology, applied in the direction of cutting tool and finishing problems, degrading the machinability as well as the structural integrity of the casting, and being unpractical,

Inactive Publication Date: 2016-04-14
SLOAN VALVE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The alloy maintains desirable mechanical properties and machinability while reducing lead content, enhancing machining lubricity and pressure tightness without the health concerns associated with lead, and is cost-effective compared to bismuth and selenium alternatives.

Problems solved by technology

Simple removal of lead or reduction below certain levels substantially degrades the machinability as well as the structural integrity of the casting and is not practicable.
Such previous attempts in the art of substituting other elements in place of lead has resulted in major machining and finishing issues in the manufacturing process, which includes primary casting, primary machining, secondary machining, polishing, plating, and mechanical assembly.
However, there is a need for a low-lead solution providing a low-cost alloy with similar properties to current copper / lead alloys without degradation of mechanical properties or chemical properties, as well as significant disruption to the manufacturing process because of lead substitution in the material causing cutting tool and finishing problems.

Method used

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Embodiment Construction

[0048]In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated and made part of this disclosure.

[0049]In one embodiment, the invention relates to a composition of matter and methods for making same. The composition of matter is a copper-based alloy having a “low” level of lead as would be ...

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Abstract

A composition for a low lead ingot comprising primarily copper and including tin, zinc, sulfur, phosphorus, nickel. The composition may contain carbon. The low lead ingot, when solidified, includes sulfur or sulfur containing compounds such as sulfides distributed through the ingot. The presence and a substantially uniform distribution of these sulfur compounds imparts improved machinability and better mechanical properties.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS[0001]This application is a continuation of U.S. Utility application Ser. No. 13 / 464,631 filed May 4, 2012, which claims priority to U.S. Provisional Patent Application No. 61 / 482,893 filed May 5, 2011 and is a continuation-in-part to U.S. Utility application Ser. No. 13 / 317,785, filed Oct. 28, 2011, which claims priority, U.S. Provisional Patent Application No. 61 / 408,518, filed Oct. 29, 2010, U.S. Provisional Patent Application No. 61 / 410,752, filed Nov. 5, 2010 and U.S. Provisional Patent Application No. 61 / 451,476, filed Mar. 10, 2011. These applications are herein incorporated by reference in their entirety.BACKGROUND OF THE INVENTION[0002]Current plumbing materials are typically made from lead containing copper alloys. One standard brass alloy formulation is referred to in the art as C84400 or the “81,3,7,9” alloy (consisting of 81% copper, 3% tin, 7% lead, and 9% zinc) (herein in after the “81 alloy”). While there has been a need,...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C22C9/04C22C1/02C22C9/02
CPCC22C9/04C22C1/02C22C9/02C22C1/03C22C9/00C22F1/08
InventorMURRAY, MICHAELSAHOO, MAHI
OwnerSLOAN VALVE COMPANY