A kind of preparation method of environment-friendly bismuth-containing brass ingot
A bismuth brass and ingot technology is applied in the field of preparation of environmentally friendly bismuth-containing copper ingots. The effect of polishing and electroplating performance, less impact on environmental pollution, and low manufacturing cost
Active Publication Date: 2016-09-21
JINTIAN COPPER GROUP CORP NINGBO
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Problems solved by technology
The composition of the above-mentioned copper alloy is relatively complicated and the process control is precise. Therefore, the market price is high, which is not conducive to the forging, casting and forming processing of plumbing and sanitary parts manufacturers.
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[0024] Below in conjunction with embodiment the present invention is described in further detail.
[0025] Take DHBi62 brass as an example:
[0026] The preferred composition of the bismuth-containing brass ingot in this embodiment: copper: 60-62wt%, bismuth: 0.8-1.0wt%, aluminum: 0.5-0.6wt%, tin: <0.2wt%, silicon: <0.05wt% , nickel: <0.1wt%, lead: <0.10wt%, the rest is zinc and unavoidable impurities, the sum of unavoidable impurities in the alloy does not exceed 0.3wt%, and the amount of copper plus zinc is greater than 97.5wt% .
[0027] The preparation method of the environment-friendly bismuth-containing brass ingot of the present embodiment is through the following steps:
[0028] 1. Feeding
[0029] Feeding sequence: 15wt% recycled material → 25wt% zinc ingot → 50wt% red copper → 8.2% zinc ingot → 1.8wt% bismuth ingot and aluminum ingot;
[0030] The composition of the recycled material: Cu: 57~65wt%, Pb: <0.5wt%, Fe: <0.3wt%, Sn: <1wt%,
[0031] Ni: <0.25wt%, Al: ...
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The invention discloses a method for preparing an environment-friendly bismuth-containing brass ingot casting. The method is characterized by comprising the following steps: charging according to the alloy composition, wherein the following components are sequentially charged in percentage by mass: 10-15 percent of return material, 25-30 percent of zinc ingots, 45-55 percent of red copper, 5-10 percent of zinc ingots and less than 2 percent of bismuth ingots and aluminum ingots; sequentially adding the raw materials into a mains frequency melting furnace, and heating until the raw materials are completely molten, so as to obtain a melt, and adding an auxiliary material flux; performing closed track-type casting; and finally, polishing, checking and performing ammonia fume inspection. An automatic and environment-friendly casting mode is adopted, the production efficiency is improved, the influence of environmental pollution is slight, the phenomena such as pores, cracks and entrainments on the surface of the brass ingot casting are eliminated, and the prepared bismuth-containing brass ingot casting meets the environment-friendly health requirement, can well meet the requirements on machining, polishing and electroplating, has good polishing and electroplating performances, is suitable for remolten forging parts, castings and machined parts, is low in manufacturing cost, provides high-quality copper ingot castings for downstream enterprises and has market competition advantages.
Description
technical field [0001] The invention relates to an environment-friendly copper ingot, in particular to a method for preparing an environment-friendly bismuth-containing copper ingot used for plumbing and sanitary parts. Background technique [0002] At present, most of the faucets, pipe fittings and other products used in the plumbing and sanitary industry are made of lead brass, with a lead content of 2%-3.5%. Lead in brass alloys can improve castability, reduce casting defects, and help improve the machinability of the alloy and the pressure resistance of the product. But lead is a harmful element, especially under the action of drinking water quality and organic acid, the lead in copper alloy will slowly precipitate and pollute the water, endangering human health; in addition, when lead brass is smelted, cut and polished, When the temperature reaches 400-500°C, the volatilization of lead and its compounds is relatively large, and lead vapor and dust in the air can form p...
Claims
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IPC IPC(8): C22C9/04C22C1/02C22C1/06
Inventor 胡明彬李密
Owner JINTIAN COPPER GROUP CORP NINGBO