Lead-Free Free-Cutting Aluminum Brass Alloy And Its Manufacturing Method

a free-cutting, aluminum brass alloy technology, applied in the direction of faucets and valves, etc., can solve the problems of increasing negative effects, inability to use brass alloys in drinking water supply systems such as faucets and valves, and increased susceptibility to hot and cold cracking

Inactive Publication Date: 2010-06-24
XIAMEN LOTA INT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, such brass alloys cannot be used in the components for drinking water supply systems, such as faucets and valves.
With the increasingly extensive application of bismuth brasses, their negative effects are also increasingly notable, such as susceptibility to hot and cold cracking, poor weldability, the necessity to slowly heat and cool when annealing, etc.
The public casting bismuth brasses, such as C89550 (which c...

Method used

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  • Lead-Free Free-Cutting Aluminum Brass Alloy And Its Manufacturing Method
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  • Lead-Free Free-Cutting Aluminum Brass Alloy And Its Manufacturing Method

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examples

[0050]The alloy composition in examples is shown in Table 1.

TABLE 1Alloy composition in examples (wt %)ExamplesCuAlBiSnSiMgBRePZn160.130.520.480.2750.12—0.00170.0050.0653Balance258.720.380.410.1650.230.090.0016—0.093Balance359.600.490.300.1330.1820.070.0017—0.0128Balance461.060.420.240.2420.130.105—0.010.051Balance561.270.430.290.2510.270.133—0.030.062Balance660.820.390.230.3180.240.08—0.010.075Balance760.260.420.370.3270.310.070.0190.040.082Balance

[0051]1. Castability

[0052]Castability of the inventive alloy is measured by four kinds of common standard test samples for casting alloys.

[0053]Volume shrinkage test samples are used for measuring the shrinkage condition. If the face of the concentrating shrinkage cavity is smooth, and there is no visible shrinkage porosity in depth, it will be shown as “O.” It indicates the alloy has good fluidity, strong feeding capacity and high casting compactability. If the face of the concentrating shrinkage cavity is smooth but the height of visibl...

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Abstract

The present invention provides a lead-free free-cutting aluminum brass alloy and its manufacturing method. The alloy comprises: 57.0˜63.0 wt % Cu, 0.3˜0.7 wt % Al, 0.1˜0.5 wt % Bi, 0.2˜0.4 wt % Sn, 0.1˜0.5 wt % Si, 0.01˜0.15 wt % P, at least two elements selected from the group of 0.01-0.15 wt % Mg, 0.0016-0.0020 wt % B, and 0.001-0.05 wt % rare earth elements and the balance being Zn and unavoidable impurities. The inventive alloy has excellent castability, weldability, cuttability and corrosion resistance. It is suitable for low pressure die casting, gravity casting, horizontal continuous casting, forging and extrusion. Its metal material cost is lower than bismuth brass. It is particularly applicable for components used in drinking water supply systems and other structural components. It is a new environmentally-friendly free-cutting aluminum brass alloy.

Description

RELATED APPLICATION[0001]This application is a continuation-in-part of U.S. application Ser. No. 12 / 643,513, filed Dec. 21, 2009, and claims priority therefrom.FIELD OF THE INVENTION[0002]The present invention generally relates to a lead-free free-cutting aluminum brass alloy, in particular a lead-free free-cutting aluminum brass alloy and its manufacturing method which is applicable in low pressure die castings and forgings.BACKGROUND OF THE INVENTION[0003]Currently, when people search and develop lead-free or low lead free-cutting brass alloys, they typically follow two routes to find the elements which could replace Lead: one route is to select the elements which hardly form solid solutions in Cu and can't form intermetallic compounds with Cu, such as Bi, Se and Te, etc; the other route is to select the elements which will form solid solutions in Cu wherein the solid solubility is reduced with decreasing temperature, so as to form intermetallic compounds with Cu, and with Sb, P, ...

Claims

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Application Information

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IPC IPC(8): B22D11/00C22C9/01B22D17/02C22C9/00C22C9/02C22C9/04
CPCB22D11/004C22C9/01C22C9/00B22D21/027
Inventor XU, CHUANKAIHU, ZHENQINGZHANG, SIQI
Owner XIAMEN LOTA INT CO LTD
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