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A lead-free brass alloy

A lead-free brass and alloy technology, applied in the field of alloys, can solve the problems of increased alloy cost and expensive lead, and achieve the effects of increasing strength and hardness, reducing zinc evaporation, and improving machining performance.

Active Publication Date: 2016-09-14
安新县华昌合金厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above attempts have promoted the development of lead-free copper alloys, there is still a lot of room for improvement in terms of casting performance such as low-pressure casting and gravity casting, as well as cutting and corrosion resistance. , and because bismuth is more expensive than lead, the use of a larger amount of bismuth will also greatly increase the cost of the alloy

Method used

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  • A lead-free brass alloy
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  • A lead-free brass alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment one: product and preparation method

[0045] The ratio of product 1 to product 9 is shown in Table 1, all of which are lead-free brass alloys for drinking water system castings. The concrete preparation method of lead-free brass alloy is carried out as follows:

[0046] Copper+charcoal→adding zinc, tin, bismuth, aluminum→stirring→refining→sampling and analyzing components→adjustment→removing slag→adding copper-arsenic, copper-boron, copper-titanium, copper-zirconium master alloys in sequence→sampling analysis→standstill→out of furnace and casting

[0047] in particular:

[0048] The first step is to heat the induction furnace, add electrolytic copper and cover it with charcoal, and heat up to fully melt the copper;

[0049] In the second step, add zinc, tin, bismuth, and aluminum concentrates and stir evenly;

[0050] The third step is to add refining agent and stir evenly. The composition of refining agent is calculated by mass percentage: 50% of silica s...

Embodiment 2

[0060] Embodiment two: casting performance test

[0061]The casting properties of the lead-free brass alloy and the prior art HPb59-1 brass alloy are compared, and the test results are shown in Table 2. Through the above test results and production practice, it can be seen that the lead-free environmentally friendly brass alloy of the present invention has excellent casting performance, greatly reduces the defects in the casting process, significantly improves the yield rate, and greatly reduces the lead content in the alloy. According to the requirements of environmental health and safety standards, it is an excellent substitute for lead brass, which is widely used and has adverse effects on human health and the ecological environment.

[0062] Table 2 Alloy product of the present invention and the casting performance comparison of HPb59-1 brass alloy

[0063]

Embodiment 3

[0064] Embodiment three: Cutting performance test

[0065] The evaluation method of cutting performance: adopt general-purpose lathe, spindle speed is 1450r / min, feed rate 0.05mm / r, depth of cut 0.5mm, tool rake angle is the turning process of 4 degrees to lead-free brass alloy material of the present invention and HPb59-1 lead brass carries out cutting test comparison, collects 100 pieces of chips of two kinds of alloy materials respectively, measures the average length of chips, divides the average length of chips of HPb59-1 brass material by the lead-free solution of the present invention The average chip length of the brass alloy material is used as an evaluation index. Through the above test, it can be seen that the cutting performance of the lead-free brass alloy of the present invention is basically the same as that of the HPb59-1 brass alloy (see Table 3).

[0066] Table 3 Cutting properties of lead-free brass alloy materials and HPb59-1

[0067] material co...

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Abstract

The invention discloses a lead-free brass alloy. The alloy comprises the following chemical components by weight percent: 59-69% of copper, 0.2-0.7% of tin, 0.6-1.8% of bismuth, 0.4-0.75% of aluminum, 0.02-0.11% of arsenic, 0.01-0.06% of boron, 0.01-0.05% of titanium, 0.01-0.04% of zirconium, less than or equal to 0.05% of lead, less than or equal to 0.3% of iron, less than or equal to 0.5% of nickel, less than or equal to 0.015% of phosphorus, less than or equal to 0.015% of antimony, less than or equal to 0.001% of cadmium, less than or equal to 0.001% of chrome and the balance of zinc and inevitable impurities. The lead-free brass alloy has excellent castability, is suitable for low pressure casting and gravity casting, is easy in cutting, dezincification-resistant and corrosion-resistant, meets environment-friendly, healthy and lead-free requirements, is suitable for drinking water system casting, has wide application prospect in plumbing sanitary industry and has the preparation cost equivalent to lead brass.

Description

Technical field [0001] The invention relates to an alloy, specifically to an alloy that is suitable for low-pressure casting and gravity casting and is easy to cut, corrosion-resistant, lead-free and environment-friendly. Background technique [0002] Lead-containing brass alloys are widely used around the world. These fields include machinery manufacturing, electrical instruments, building hardware, drinking water pipelines, etc. Lead-containing brass alloys generally add 1 to 3% metallic lead to the copper-zinc alloy. Lead can make the brass alloy have good mechanical properties and casting properties, and is easy to cut, or it can be made by low-pressure casting, gravity casting and other casting methods. into various parts. It is well known that lead has a destructive effect on human health and ecological balance, and the worldwide trend is to impose more and more restrictions on the use of lead-containing alloys. Japan stipulates that the leaching amount of lead in dr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/02C22C9/01C22C9/00
Inventor 杨桂香杨景周杨景浩
Owner 安新县华昌合金厂