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Copper alloy with no lead
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A technology of lead-copper alloy and master alloy, which is applied in the field of copper alloy, can solve environmental and human health hazards and other problems, and achieve the effects of eliminating environmental and human hazards, good cutting performance, and low rare earth content
Inactive Publication Date: 2009-12-09
JIANGXI UNIV OF SCI & TECH
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Summary
Abstract
Description
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Problems solved by technology
[0004] In order to overcome the harm to the environment and human health caused by the heavy metal lead in the existing copper alloy, the present invention provides a lead-free copper alloy that does not affect the mechanical properties and cutting performance of the brass alloy, and is more in line with environmental protection and people's health
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0012] Using an intermediate frequency induction furnace, add nickel, silicon, aluminum, tin, zinc, phosphorus copper master alloy, copper bismuth master alloy, copper selenium master alloy, rare earth copper master alloy into the copper melt according to the composition ratio and feeding order, After stirring evenly, cast into Φ80×185mm alloy ingot. Its components by weight percentage are: 50.0% Cu, 36.0% Zn, 6.0% Sn, 0.1% Ni, 0.2% Si, 0.2% Bi, 0.1% Se, 0.05% Al, 0.1% P, 0.01% RE, The rest are unavoidable impurities.
[0013] The mechanical properties of the lead-free copper alloy produced by the above-mentioned production process after being extruded and drawn into a round bar are:
[0014] Elongation (%)
Tensile strength (Mpa)
Yield strength (Mpa)
End face shrinkage (%)
Hardness (HB)
15.0
600.0
550.0
38.0
120.0
[0015] Other performance indicators are as follows:
[0016] 1. Thermal processing performance:...
Embodiment 2
[0021] Using an intermediate frequency induction furnace, add nickel, silicon, aluminum, tin, zinc, phosphorus copper master alloy, copper bismuth master alloy, copper selenium master alloy rare earth copper master alloy into the copper melt according to the composition ratio and feeding order, and stir After uniformity, cast water meter housing with sand mold. Its components by weight percentage are: 82.5% Cu, 3.0% Zn, 6.0% Sn, 0.1% Ni, 0.2% Si, 0.2% Bi, 0.1% Se, 0.05% Al, 0.1% P, 0.5% RE, The rest are unavoidable impurities.
[0022] The mechanical properties of the alloy in the as-cast state are:
[0023] Elongation (%)
[0024] The experiment proves that the alloy has good fluidity; it has good cutting performance, which is equivalent to that of H59-1; it has less shrinkage porosity, accounting for only 0.4% of the volume; tend to be smaller.
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Abstract
The invention relates to a copper alloy, in particular to a lead-free free-cutting copper alloy. From 55.0-89%Cu, 3.0-45%Zn, 0.1-10%Sn, 0.1-2.0%Ni, 0-5.0%Si, 0.1-5.0%Bi, 0.1-3.0%Se, 0.01-1.0%Al, 0.05 -0.15%P, 0.01%-0.5%RE composition. RE, bismuth, selenium and phosphorus are added as rare earth copper, copper bismuth, copper selenium, phosphorus copper master alloy or bismuth selenium, phosphorus copper alloy respectively. The invention can eliminate the harm of lead to the environment and human body in the process of production, use and recycling; has good cutting performance, mechanical performance and thermal processing performance; good flow performance, good casting performance, and small thermal cracking tendency; production The process is simple and can be prepared on existing lead brass production equipment; the content of bismuth, selenium and rare earth is low, and the production cost will not be increased too much.
Description
technical field [0001] The invention relates to a copper alloy, especially a lead-free copper alloy. Background technique [0002] Brass is used in technical fields such as machinery manufacturing, electrical components, building materials and public health engineering. In order to obtain good mechanical properties and cutting properties, lead is often added to lead-copper alloys. For example, the copper alloy pipe fittings used for water supply are generally cast with C84400 and C83600 copper alloys. However, the lead content of C84400 copper alloy is 7%, and the lead content of C83600 is also 5%. When these two lead-containing copper alloy casting pipe fittings are used in the water supply system, the lead in the pipe fittings will be partially dissolved in the water. According to scientific determination, the lead content in the water can reach more than 50ppm. With the increasing awareness of environmental protection and health, people pay more and more attention to lea...
Claims
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Application Information
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