Novel Pb-free tin bronze alloy and method for producing a pipe from alloy
A bronze alloy and tin bronze technology, which is applied in the field of new Pb-free tin bronze alloy and the use of the alloy to manufacture pipes
Inactive Publication Date: 2015-12-30
SUZHOU TIANJIAN METAL NEW MATERIAL
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Problems solved by technology
However, there are few reports on the use of rare earth elements to improve the mechanical properties of bronze alloys.
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[0027] Specifically, the present invention prepares the bronze alloy through the following steps:
[0028] Step 1: Weigh electrolytic copper, Sn, Zn, Si according to the proportions shown in Table 1, place them in a power frequency electric furnace, heat them to 1250-1300 °C to completely melt the elements, and then proceed at 1200 °C. Insulation;
[0029] Step 2: Powdering bismuth, iron and manganese using the existing powder processing technology, and uniformly mixing the powder of the above elements with rare earth elements according to the ratio shown in Table 1, and adding the mixed powder to the melt obtained in step 1 middle;
[0030] Step 3: After fully stirring the completely melted alloy melt with a graphite stirring rod, cover it with high-purity scaly graphite powder to prevent it from oxidizing and keep warm, and the thickness of the graphite powder is about 11-13 cm;
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Abstract
The invention provides a novel Pb-free tin bronze alloy. The alloy is characterized by comprising 4%-6% of Zn by mass, 4%-6% of Sn by mass, 1%-2.2% of Bi by mass, 1%-2% of Fe by mass, 0.1%-0.5% of Mn by mass, 0.5%-1.5% of Si by mass, 0.02%-0.1% of rare earth by mass and the balance of Cu and inevitable impurities. The invention further provides a method for preparing a pipe from the Pb-free tin bronze alloy and the pipe prepared with the method. With the adoption of the tin bronze alloy, usage of the Pb element toxic to human bodies is avoided, meanwhile, mechanical properties are improved to a certain extent, the alloy can completely replace traditional Pb-containing tin bronze alloy materials to be applied to production of elastic components and wear-resistant parts.
Description
technical field [0001] The present invention relates to a new type of Pb-free tin bronze alloy and a method for manufacturing pipes by using the alloy. Background technique [0002] Tin bronze is a bronze with Sn as the main alloying element. The tin content is generally 3 to 14% by mass. It has high mechanical properties, wear resistance and corrosion resistance, easy cutting, good brazing and welding performance, and shrinkage. It has the advantages of small coefficient and no magnetism, and is widely used in the manufacture of elastic components and wear-resistant parts. [0003] Existing tin bronze materials often add Pb element in order to improve the chip performance, but Pb and Pb-containing compounds are toxic to the human body. When the poisoning is deep, it will cause damage to the nervous system, and in severe cases, it will cause lead toxic encephalopathy. Therefore, with the obvious improvement of environmental protection awareness, the domestic and foreign ma...
Claims
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Login to View More IPC IPC(8): C22C9/02C22C9/04C22F1/08
Inventor 陆海荣孙飞赵勇
Owner SUZHOU TIANJIAN METAL NEW MATERIAL