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Brass alloy bar replacing lead element by unidirectionally cutting bismuth, aluminium and tin and preparation for same

A brass alloy, one-way technology, applied in the field of alloy rods, can solve the problems of lead-containing alloy rod pollution, inability to meet requirements, and difficult processing.

Active Publication Date: 2013-04-17
SUZHOU JINCANG ALLOY NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because it contains lead, it is easy to cause hot embrittlement during hot processing, so it can only be processed in a cold state, which is difficult to process and leads to high cost
And with the gradual improvement of people's awareness of environmental protection, lead-containing alloy rods have been unable to meet the requirements of high-end markets at home and abroad due to their environmental pollution.

Method used

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  • Brass alloy bar replacing lead element by unidirectionally cutting bismuth, aluminium and tin and preparation for same

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] A brass alloy rod with bismuth, aluminum and tin unidirectional cutting instead of lead, including the following components in weight percentage: 58%-64% copper, 0.5%-3% bismuth, 1%-4% aluminum, 0.5%- 1% tin, the balance zinc.

[0024] The above-mentioned brass alloy rods with bismuth, aluminum and tin unidirectional cutting instead of lead elements can be prepared by the following method: first, put each component in a power frequency electric furnace according to the ratio, heat it to 1200-1280 degrees and completely melt it, then keep it warm to 1230°C-1250°C; After fully stirring the completely melted alloy liquid with a graphite rod, cover it with high-purity scaly graphite powder to prevent its oxidation, the thickness is about 20cm-25cm; after holding time for 1.5h-2.5h, Use the Spike direct-reading spectrometer imported from Germany to conduct 3-5 sub-component inspections on the samples taken out of the furnace, and confirm that the proportion of each element i...

Embodiment 2

[0027] A brass alloy rod with bismuth, aluminum and tin unidirectional cutting instead of lead, including the following components in weight percentage: 58%-63% copper, 1%-3% bismuth, 2%-4% aluminum, 0.5%- 1% tin, the balance zinc.

[0028] The above-mentioned brass alloy rods with bismuth, aluminum and tin unidirectional cutting instead of lead can be prepared by the following method: first, put each component in a power frequency electric furnace according to the ratio, heat it to 1200-1250 degrees and completely melt it, then keep it warm to 1230 degrees; After stirring the completely melted alloy liquid with a graphite rod, cover it with high-purity flake graphite powder to prevent its oxidation, the thickness is about 22cm-25cm; after the holding time is 2h-2.5h, use German imported Si The Parker direct-reading spectrometer conducts 3-5 sub-component inspections on the samples taken out of the furnace, and confirms that the proportion of each element is within the predete...

Embodiment 3

[0031] A brass alloy rod with bismuth, aluminum and tin unidirectionally cut to replace lead, comprising the following components in weight percent: 58% copper, 1% bismuth, 2% aluminum, 0.5% tin, and the balance zinc. The preparation method is as follows:

[0032] Step 1: Put each component in a power frequency electric furnace according to the ratio, heat it to about 1250 degrees, and heat it to about 1240 degrees after it is completely melted; After fully stirring the completely melted alloy liquid with a graphite rod, cover it with high Purity flaky graphite powder to prevent its oxidation, the covering thickness is about 20cm-25cm. After 1.5h-2.5h of heat preservation, the samples taken out of the furnace were inspected for 3-5 times with a direct-reading spectrometer imported from Germany, and the ratio of each element was determined to be within the predetermined range. After further heat preservation for 1h-1.5h, the temperature was raised again to 1250-1280°C, and the...

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Abstract

The invention discloses a brass alloy bar replacing lead element by unidirectionally cutting bismuth, aluminium and tin, comprising the following constituents in percent by weight: 58-64% of copper, 0.5-3% of bismuth, 1-4% of aluminium, 0.5-1% of tin and the balance of zinc. The design principle of the lead-free brass alloy ingredients of the brass alloy bar disclosed by the invention avoids the addition of lead on the basis of keeping the cutability, the wear resistance and the antifrictionability of the original lead-containing tin bronze, suppressing the dissolution of lead by adding a silicon element and an aluminium element, and controlling the dissolution quantity of lead to be less than 0.01 mg / L. The principle is to form independent phases with dispersed distribution in a copper alloy by virtue of the added bismuth element, aluminium element and tin element, wherein the independent phases play a chip-breaking role during cutting, thus improving the cutting machinability of brass.

Description

technical field [0001] The invention relates to the field of alloy rods, in particular to a brass alloy rod in which bismuth, aluminum and tin are unidirectionally cut to replace lead elements, and a preparation method of the alloy rod. Background technique [0002] The reason why the lead-containing copper alloy has good cutting performance and anti-friction and wear resistance is mainly because lead exists in a single item in the copper alloy, which plays a good role in breaking chips during cutting; in the friction and wear environment, due to the lead shearing The shear strength is very low, and the lead on the surface of copper alloy parts makes the coefficient of friction of leaded copper alloys relatively low. Therefore, lead element is more commonly used in brass alloys. However, because it contains lead, it is easy to cause hot embrittlement during hot processing, so it can only be processed in a cold state, which is difficult to process and leads to high cost. An...

Claims

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Application Information

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IPC IPC(8): C22C9/04C22C1/02C21D8/06C22F1/08
Inventor 孙飞
Owner SUZHOU JINCANG ALLOY NEW MATERIAL
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