Lead-free free-cutting brass alloy and preparation method thereof

A brass alloy, free-cutting technology, applied in the field of lead-free free-cutting brass alloy and its preparation, can solve the problems of high cost and complicated production process, and achieve the effects of low cost, cost reduction and excellent mechanical properties

Active Publication Date: 2012-12-19
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these lead-free brass alloys have not been mass-produced due to fac

Method used

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  • Lead-free free-cutting brass alloy and preparation method thereof
  • Lead-free free-cutting brass alloy and preparation method thereof
  • Lead-free free-cutting brass alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Select Cu99.9% industrial pure copper and customized copper-zinc master alloy, copper-bismuth master alloy, copper-manganese master alloy, copper-lanthanum master alloy, and recycled nickel-plated tin copper plate scraps as raw materials, of which copper-zinc master alloy The zinc content in the alloy is 56.01%, the bismuth content in the copper-bismuth master alloy is 19.91%, the manganese content in the copper-manganese master alloy is 25.32%, the lanthanum content in the copper-lanthanum master alloy is 24.95%, and the tin content in the nickel-tin-plated copper plate is 14.10% , The nickel content is 9.20%. Calculate and weigh raw materials according to the weight percentage of the formula range: 25g Cu-Bi master alloy, 50g copper-manganese master alloy, 50g nickel-tin-plated copper plate, 5g Cu-RE master alloy, 600g Cu-Zn master alloy, 420g pure copper. Melt the weighed raw materials in a high-frequency induction heating furnace. First, put the copper-manganese int...

Embodiment 2

[0037] Example 2: Choose Cu99.9% industrial pure copper and customized copper-zinc, copper-bismuth, copper-manganese, copper-lanthanum master alloys, as well as recycled nickel-plated tin copper plate scraps as raw materials, of which the zinc content in the copper-zinc master alloy 56.01%, the bismuth content in the copper-bismuth master alloy is 19.91%, the manganese content in the copper-manganese master alloy is 25.32%, the lanthanum content in the copper-lanthanum master alloy is 24.95%, the tin content in the nickel-plated tin copper plate is 14.10%, and the nickel content is 9.20%. Calculate and weigh raw materials according to the weight percentage of the formula range: 50g Cu-Bi master alloy, 75g Cu-Mn master alloy, 100g nickel-plated tin copper plate, 10g Cu-RE master alloy, 650g Cu-Zn master alloy, 265g pure copper. Melt the weighed raw materials in a high-frequency induction heating furnace. First, put the copper-manganese intermediate alloy and pure copper into ...

Embodiment 3

[0040] Example 3 : Select Cu99.9% industrial pure copper and customized copper-zinc, copper-bismuth, copper-manganese, copper-lanthanum master alloys, as well as recycled nickel-plated tin-copper scraps as raw materials, of which the zinc in the copper-zinc master alloy content of 56.01%, the content of bismuth in copper-bismuth master alloy is 19.91%, the content of manganese in copper-manganese master alloy is 25.32%, the content of lanthanum in copper-lanthanum master alloy is 24.95%, the content of tin in nickel-plated tin copper plate is 14.10%, and the content of nickel 9.20%. Calculate and weigh the raw materials according to the weight percentage of the formula range: 75g Cu-Bi master alloy, 100g Cu-Mn master alloy, 150g nickel-tin-plated copper plate, 15g Cu-RE master alloy, 700g Cu-Zn master alloy, 110g pure copper. Melt the weighed raw materials in a high-frequency induction heating furnace. First, put the copper-manganese intermediate alloy and pure copper into t...

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Abstract

The invention relates to a lead-free free-cutting brass alloy. The lead-free free-cutting brass alloy is prepared from the following raw materials in percent by weight: 26.0-38.0% of zinc, 0.2-3.5% of bismuth, 1.0-2.1% of manganese, 0.5-2.0% of tin, 0.3-2.0% of nickel, 0.1-0.4% of rare earth lanthanum, less than 0.1% of impurity and 52.0-71.6% of copper. The concrete preparation method comprises the steps of weighing the raw materials in a formula, sequentially placing the raw materials into a intermediate-frequency smelting furnace, heating up and degassing, deslagging and standing, smelting, casting, and carrying out deformation hot working treatment. Microhardness of the lead-free free-cutting brass alloy disclosed by the invention is 130-150HV, tensile strength is more than 450MPa, and elongation is more than 20%; thickness of a dezincification layer in a dezincification corrosion test is 150-200mu m and is far below 350-400mu m, namely the thickness of the dezincification layer of a lead brass alloy; and recycled leftover materials of a nickel-tin-plated copper plate are selected as raw materials in the preparation method disclosed by the invention, and cost is low, thus having energy-saving and environment-friendly significances.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal processing, and in particular relates to a lead-free free-cutting brass alloy and a preparation method thereof, including formula design and melting, continuous casting and rolling (or continuous casting and extrusion) of the lead-free free-cutting brass alloy and other preparation techniques. Background technique [0002] Lead brass alloy has extremely good cutting performance, good corrosion resistance and processing performance, and more importantly, its price is much cheaper than ordinary copper alloy, the cost is low, and the production process is simple. Therefore, lead-brass alloys have long been the most economical and practical alloys and have been widely used in electronic appliances, household appliances, drinking water devices, aerospace, machinery, automobiles, instruments, hardware and other fields. Lead hardly dissolves in the brass alloy, and mainly exists as an independ...

Claims

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Application Information

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IPC IPC(8): C22C9/04C22C1/03C22F1/08
Inventor 黄新民吴玉程秦永强舒霞郑玉春韩和兵
Owner HEFEI UNIV OF TECH
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