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Lead-Free Brass Alloy

a brass alloy, lead-free technology, applied in the field of brass compositions, can solve the problems of affecting the phase of copper lead alloys, toxic substances, and expensive control procedures in the production of alloys, and achieve the effects of eliminating or reducing the amount of retooling, excellent dezincification resistance, and excellent machinability and conductivity

Inactive Publication Date: 2010-09-09
NAT BRONZE & METALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention is a brass alloy that contains a small amount of tellurium as a substitute for lead. The alloy has good machinability and conductivity, and can be easily recycled by the manufacturer. It also has excellent resistance to dezincification. The alloy can be used to produce finished products with minimal retooling. The invention also allows for the recycling of scrap from the manufacturing process. Overall, the invention provides a cost-effective and environmentally friendly solution for manufacturing brass products."

Problems solved by technology

Lead, however, is a toxic substance and its use in the production of alloys is surrounded by legislation and expensive control procedures.
Furthermore, the lead phase in copper lead alloys can be affected by corrosive attacks with hot organic or mineral oil.
If this leaching progresses to any appreciable extent, the component, if it is a bearing or structural component, may eventually malfunction or fail.
While the alloys described above yield substantially lead-free alloys, they do not possess the same machinability as the lead containing alloys.
This results in the need for substantial retooling of the equipment used to produce end product, such as plumbing equipment and the like.
In addition, the scrap produced during the manufacturing of the lead products often cannot be readily recycled by the end product manufacturer.
The cost of shipping the scrap back to the initial foundry increases the overall product cost of the end product.

Method used

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  • Lead-Free Brass Alloy

Examples

Experimental program
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Effect test

examples

[0023]A series of brass alloys were prepared where the added lead (typically about 2%) was replaced with approximately 0.5% tellurium. The composition of each alloy is shown in Table 1.

TABLE 1SampleCuPbZnTePSnABalance5.100.50.011—BBalance0.008.820.57.001—C83.030.06Balance.0520.050.11D59.410.02Balance0.170.05—

[0024]The billets were then changed into an extrusion press at a temperature ranging from about 780° C. to about 860° C. The billets were then hot extruded through a variety of dies and at different pressures to produce numerous sizes. Each shot was lubricated prior to extrusion and the extrusion dies were preheated. The results are shown in Table 2.

TABLE 2SampleFinal Draw SizeShot TempPressureLengthA131.75 mm808° C.234 MPa  12 mA275.40 mm822° C.268 MPa18.5 mA319.05 mm803° C.305 MPa  34 mB131.75 mm794° C.267 MPa  12 mB225.40 mm800° C.289 MPa18.5 mB319.05 mm806° C.304 MPa  34 mB412.70 mm870° C.265 MPa  67 mC1a25.40 mm830° C.298 MPa18.4 mC1b25.40 mm867° C.280 MPa18.4 mC2a50.80 mm7...

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Abstract

The invention relates to brass alloys that are substantially lead-free. In the alloys of the invention, lead is replaced with tellurium resulting in alloys that exhibit excellent machinability and conductivity.

Description

TECHNICAL FIELD[0001]The present invention relates to brass compositions with extremely low to no lead content. The compositions exhibit good machinability and strength similar to that of conventional leaded brass alloy free machining brass.BACKGROUND OF THE INVENTION[0002]It has been common practice to add up to 4.5% lead to brass compositions to improve the machinability of the resulting product. Lead, however, is a toxic substance and its use in the production of alloys is surrounded by legislation and expensive control procedures. For example, California adopted legislation which limits the amount of lead in plumbing fixtures to 0.25% or less beginning in 2010.[0003]Furthermore, the lead phase in copper lead alloys can be affected by corrosive attacks with hot organic or mineral oil. For example, when temperature of such an alloy rises, it has been known that the oil can break down to form peroxides and organic gases which effect a degree of leaching on the lead phase within the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C9/04
CPCC22C9/04
Inventor LAZARUS, NORMAN M.
Owner NAT BRONZE & METALS INC
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