Tin-bismuth brass and production process thereof as well as device for producing tin-bismuth brass
A production process and a brass technology are applied in the field of tin-bismuth brass and its production process and the field of the device for producing tin-bismuth brass, which can solve the problems of environmental and human harm, detachment and the like, and achieve the effects of cost saving and good cutting performance.
Active Publication Date: 2015-03-11
NINGBO SHENGFA COPPER IND
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Problems solved by technology
However, lead is a harmful element. Lead brass will come out during processing and use, which will cause great harm to the environment and human body. Therefore, governments of various countries have successively issued restrictions on the application of lead-containing copper alloys. Lead brass The application of copper will face strict restrictions and challenges, so the development of lead-free free-cutting copper alloys to replace lead brass has become a major issue in the metal material manufacturing industry in the world today
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[0024] The present invention will be further described below in conjunction with accompanying drawing:
[0025] Implementation modes one to nine:
[0026] Table 1 is the alloy composition (wt%) of the invention embodiment
[0027]
[0028]
[0029] Table 1 divides the alloy of the present invention into three groups, and each group is further divided into three groups for element combination.
[0030] Ca, Al, and P in Table 1 are X elements. In addition, X elements are at least three of rare earth, calcium, aluminum, phosphorus, boron, and lithium. The main function of adding X elements is to refine the grains and prevent the grains The second is to form metal compounds with other elements in the impurities, and make them evenly distributed in the crystal to prevent segregation at the boundary; the third is to degas and improve the fluidity of cast metal.
[0031] The main function of adding rare earth as a modifier and refining agent is to refine the grain, increase t...
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The invention relates to a metal material and in particular relates to tin-bismuth brass and a production method thereof as well as a device for producing the tin-bismuth brass. The tin-bismuth brass disclosed by the invention comprises the following elements in percentage by weight: 57.0%-63.0% of copper, 2.0%-4.2% of bismuth, 0.01%-0.70% of iron, 0.10%-0.60% of tin, not more than 0.008% of lead, 0.2%-1.2% of X element and not more than 2.5% of inevitable impurities and the balance of zinc. The invention further relates to the production process of the tin-bismuth brass and the device for producing the tin-bismuth brass. The bismuth element is commonly regarded as the best substitute element of the lead due to the characteristics of the bismuth, but the production cost of bismuth brass is far higher than that of the lead brass; moreover, the materials for producing the bismuth brass are mainly pure novel metals, otherwise, the phenomena including fusion-casting cracks, annealing fracture and the like due to high impurity content appear. Although, the health and environment-friendliness can be facilitated by using bismuth brass to replace the lead brass, in a lead brass production, the comprehensive recycling of regenerative copper is commonly adopted, so that the materials are recycled and the cost is saved. After adjusting the whole element content, the tin-bismuth brass disclosed by the invention has better cutting characteristics.
Description
technical field [0001] The invention relates to a metal material, in particular to tin-bismuth brass, its production process and a device for producing tin-bismuth brass. Background technique [0002] Lead brass has good cold and hot workability, easy cutting and low price, so it is widely used in various industries. However, lead is a harmful element. Lead brass will come out during processing and use, which will cause great harm to the environment and human body. Therefore, governments of various countries have successively issued restrictions on the application of lead-containing copper alloys. Lead brass The application of copper will face strict restrictions and challenges, so the development of lead-free free-cutting copper alloys to replace lead brass has become a major issue in the metal material manufacturing industry in the world today. Contents of the invention [0003] 1. Technical problems to be solved [0004] The purpose of the present invention is to addr...
Claims
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IPC IPC(8): C22C9/04C22C1/03B22D1/00
Inventor 曾德珠李海涛
Owner NINGBO SHENGFA COPPER IND