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A kind of free-cutting brass wire rod and preparation method thereof

An easy-cutting, brass technology, applied in the field of copper alloy materials and technology, can solve the problems of poor cutting performance and not meeting the cutting processing requirements of parts, etc., and achieve the effect of easy cutting, good cutting performance, and scientific and reasonable ratio

Active Publication Date: 2021-02-02
JINTIAN COPPER GROUP CORP NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the Pb content in brass is below 0.1%, its cutting performance is very poor, which does not meet the cutting requirements of parts

Method used

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  • A kind of free-cutting brass wire rod and preparation method thereof
  • A kind of free-cutting brass wire rod and preparation method thereof
  • A kind of free-cutting brass wire rod and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of free-cutting brass wire:

[0033] (1) Batching and smelting: According to the following chemical composition and mass percentage: Cu: 57.5%, Sn: 0.17%, Fe: 0.34%, Ni: 0.07%, Pb: 0.04%, the balance is Zn, weigh electrolytic copper, Nickel block, copper-iron master alloy containing 20% ​​iron, tin block, zinc ingot, lead block; the electrolytic copper, nickel block, copper-iron master alloy containing 20% ​​iron, tin block, zinc ingot, lead Put the block into the smelting furnace to melt; after all the raw materials are melted, add 100-500g slag remover, stir for 30-60s, remove the scum on the liquid surface, add charcoal to cover, and cover the thickness of 30-80mm; then heat up to 1030-1050 ℃, fire 2 times, 10-30s each time, let it stand for 8 minutes, then transfer to the holding furnace, add charcoal to cover, and the covering thickness is 80-100mm.

[0034] (2) Casting: When the temperature of the holding furnace reaches 1030-1040°C, the horizontal co...

Embodiment 2

[0040] Preparation of free-cutting brass wire:

[0041] (1) Batching and smelting: According to the following chemical composition and mass percentage: Cu: 57.3%, Sn: 0.28%, Fe: 0.14%, Ni: 0.26%, Pb: 0.06%, the balance is Zn, weigh electrolytic copper, Nickel block, copper-iron master alloy containing 20% ​​iron, tin block, zinc ingot, lead block; the electrolytic copper, nickel block, copper-iron master alloy containing 20% ​​iron, tin block, zinc ingot, lead Put the block into the smelting furnace to melt; after all the raw materials are melted, add 100-500g of slag remover, stir for 30-60s, remove the scum on the liquid surface, add charcoal to cover, and cover with a thickness of 30-80mm; then heat up to 1050-1060 ℃, fire 2 times, 10-30s each time, let it stand for 10 minutes, then transfer to the holding furnace, add charcoal to cover, and the covering thickness is 80-100mm.

[0042] (2) Casting: When the temperature of the holding furnace reaches 1040-1050°C, the horizo...

Embodiment 3

[0048] Preparation of free-cutting brass wire:

[0049] (1) Batching and smelting: According to the following chemical composition and mass percentage: Cu: 57.1%, Sn: 0.06%, Fe: 0.41%, Ni: 0.33%, Pb: 0.03%, the balance is Zn, weigh electrolytic copper, Nickel block, copper-iron master alloy containing 20% ​​iron, tin block, zinc ingot, lead block; the electrolytic copper, nickel block, copper-iron master alloy containing 20% ​​iron, tin block, zinc ingot, lead Put the block into the smelting furnace to melt; after all the raw materials are melted, add 100-500g slag remover, stir for 30-60s, remove the scum on the liquid surface, add charcoal to cover, and the covering thickness is 30-80mm; then heat up to 1030-1045 ℃, fire 2 times, 10-30s each time, let it stand for 15 minutes, then transfer to the holding furnace, add charcoal to cover, and the covering thickness is 80-100mm.

[0050] (2) Casting: When the temperature of the holding furnace reaches 1030-1045°C, the horizonta...

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Abstract

The invention discloses a free-cutting brass wire and a preparation method thereof. According to mass percentage, the free-cutting brass wire consists of the following chemical components: Cu: 57.0-58.0%, Sn: 0.05-0.5%, Fe: 0.05 ‑0.5%, Ni: 0.05‑0.5%, Pb: ≤0.07%, the balance is Zn and unavoidable trace impurities. The preparation method of the free-cutting brass wire includes: batching, smelting, casting, extruding, drawing, intermediate softening annealing, drawing with small processing rate, low temperature stress relief annealing, finished product inspection and packaging. The free-cutting brass wire rod of the present invention has a scientific and reasonable composition ratio, high gold strength, and still has good cutting performance when the lead content is very low (Pb: ≤0.07%), and can replace lead brass for production Terminal block; meanwhile, the very low lead content makes the wire rod of the present invention green and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of copper alloy materials and processes, in particular to a free-cutting brass wire and a preparation method thereof. Background technique [0002] Leaded brass has good machinability and is widely used. However, lead is a harmful element. It will damage the brain center and peripheral nervous system after being absorbed by the human body, and have a certain impact on human health. With the improvement of people's health awareness, some fields that originally used lead brass gradually require lead-free , and other materials that replace lead brass have problems such as difficult production, high cost, and difficult recycling of waste materials, which limit their application in some fields. [0003] EU ROHS stipulates that the Pb content of copper alloys for electronics and auto parts should be less than 0.1%; CDA (American Copper Association) stipulates that the Pb content of lead-free environmentally frien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/04C22C1/03C22F1/08
CPCC22C1/03C22C9/04C22F1/08
Inventor 叶东皇郑恩奇夏文彬王文龙傅杰方洁
Owner JINTIAN COPPER GROUP CORP NINGBO