Manganiferous lead-free forgeable easy-cutting brass and preparation method thereof

A free-cutting and brass technology, applied in the field of lead-free free-cutting brass alloy and its preparation, can solve the problems of easy cracking on the surface, poor forging performance of lead-free free-cutting brass, etc. Hazardous, easy recovery and recycling, effect of good cutting performance

Inactive Publication Date: 2012-03-21
JINTIAN COPPER GROUP CORP NINGBO
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Problems solved by technology

[0004] The above-mentioned lead-free free-cutting brass has poor forging performance, and cracks are prone to appear on the surface after hot forging, so further improvement is needed in forging performance

Method used

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  • Manganiferous lead-free forgeable easy-cutting brass and preparation method thereof

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[0029] A method for preparing manganese-containing lead-free forgeable free-cutting brass, the specific process is as follows:

[0030] First, a copper-bismuth master alloy is prepared. The preparation method of the copper-bismuth master alloy is as follows: the proportion of bismuth is 30wt%, and the balance is copper and unavoidable impurities, and copper and bismuth are melted in a vacuum melting furnace with a vacuum degree of less than 1Pa in the range of 1080-1100°C. Cast a round ingot of copper-bismuth master alloy at 1030-1050°C, and break the ingot into blocks for later use.

[0031] The preparation method of the brass alloy is as follows: 57-62wt% copper, 0.3-2.5wt% bismuth, 0.5-4.0wt% manganese, the balance is zinc and unavoidable impurities, and the total amount of impurities is not more than 0.2wt%. Add electrolytic copper, electrolytic manganese, copper-bismuth intermediate alloy, and electrolytic zinc into the induction furnace in sequence; the melting temperat...

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Abstract

The invention discloses manganiferous lead-free forgeable easy-cutting brass and a preparation method thereof. The manganiferous lead-free forgeable easy-cutting brass is characterized by comprising the following components in percentage by weight: 57-62 wt% of copper, 0.3-2.5wt% of bismuth, 0.5-4.0 wt% of manganese, less than or equal to 0.2wt% of impurities and the balance of zinc. The preparation method comprises the following steps of: firstly preparing copper-bismuth intermediate alloy, then adding electrolytic copper, electrolytic manganese, the copper-bismuth intermediate alloy and electrolytic zinc into an electric induction furnace in sequence for smelting at the smelting temperature of 1030-1080 DEG C, and after all the metals are melted, maintaining the temperature for 5-30 minutes; carrying out casting of a copper-alloy ingot at the casting temperature of 1030-1050 DEG C; then heating a copper-alloy casting ingot to 570-700 DEG C for hot extrusion; and finally carrying out acid cleaning, scalping, drawing, straightening and stress relieving annealing on an extruded semi-finished product to obtain a finished product. In the manganiferous lead-free forgeable easy-cutting brass disclosed by the invention, the chemical component is simple, the recovery and reutilization are easy, the cutting performance, the forging performance, the mechanical performance and cold-hot forming performance are good, the production process is simple, and the manganiferous lead-free forgeable easy-cutting brass can be manufactured by utilizing the existing lead-brass production equipment without adding new equipment.

Description

technical field [0001] The invention relates to a lead-free free-cutting brass alloy and a preparation method thereof, in particular to a manganese-containing lead-free free-cutting brass and a preparation method thereof. Background technique [0002] Brass has a beautiful appearance and excellent performance, and is widely used in many fields. Adding a small amount of lead (about 1 to 4.5%) to brass significantly improves the cutting performance of the material, thus bringing convenience to the processing of complex-shaped daily necessities and mechanical parts. As people pay more and more attention to their own health and further enhance their awareness of environmental protection, people pay more and more attention to the harm of lead in lead brass to the human body, and it has attracted the close attention of many developed countries. They have or are formulating relevant laws and regulations to control the content of some harmful elements in industrial products. For e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04C22C1/02
Inventor 巢国辉王永如慕思国贺挺洪燮平
Owner JINTIAN COPPER GROUP CORP NINGBO
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