Leadless free-cutting bismuth brass alloy

A technology of brass alloy and bismuth brass, which is applied in the field of metal material manufacturing, can solve problems such as polluting water sources, soil, polluting the atmosphere, and difficult removal, and achieves good mechanical properties, improved thermal processing performance, and stable product performance.

Inactive Publication Date: 2010-12-22
厦门火炬特种金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low solid solubility of lead in brass, most of them are distributed in free form, which leads to the pollution of water sources, soil, or Pollution of the atmosphere when waste is incinerated and waste is remelted
Lead is one of the heavy metals that are extremely harmful to the human body, and lead is not easy to remove after being discharged into the environment, and accumulates in the environment, which is very easy to produce toxic effects on organisms and humans

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The material composition (weight percentage) is: 60.0% Cu, 1.0% Bi, 0.8% Sn, 0.3% Al, 0.05% P, 0.05% RE, the balance is Zn and unavoidable impurities, and the content of lead in impurities is less than 0.1% .

[0023] Melt industrial pure copper, industrial pure tin, industrial pure aluminum, industrial pure zinc and copper-bismuth, copper-mixed rare earth, and phosphorus-copper master alloys in an intermediate frequency furnace according to the ratio of material composition and the order of feeding. After stirring evenly, cast Formed into φ55×180mm billet, after the billet was cut to length, it was extruded at 670°C and cold-drawn with small deformation to make φ15mm bar. The tensile strength of the lead-free free-cutting bismuth brass alloy produced in this embodiment is 460 MPa, the hardness is HB126, and the relative machinability rate is about 80%.

Embodiment 2

[0025] The material composition (weight percentage) is: 58.0% Cu, 2.0% Bi, 0.2% Se, 0.6% Al, 0.1% P, 0.08% RE, the balance is Zn and unavoidable impurities, and the content of lead in the impurities is less than 0.1% .

[0026] Melt industrial pure copper, industrial pure aluminum, industrial pure zinc and copper-bismuth, copper-selenium, copper-mixed rare earth, and phosphorus-copper master alloys in an intermediate frequency furnace according to the material composition ratio and feeding sequence, stir evenly, and cast Formed into φ55×180mm billet, after the billet was cut to length, it was extruded at 670°C and cold-drawn with small deformation to make φ15mm bar. The tensile strength of the lead-free free-cutting bismuth brass alloy produced in this embodiment is 445 MPa, the hardness is HB121, and the relative machinability rate is about 88%.

Embodiment 3

[0028] The material composition (percentage by weight) is: 62.0% Cu, 0.6% Bi, 0.15% Sn, 0.01% Se, 0.05% Al, 0.01% P, 0.03% RE, and the balance is Zn and unavoidable impurities, lead in the impurities The content is less than 0.1%.

[0029] Melt industrial pure copper, industrial pure tin, industrial pure aluminum, industrial pure zinc and copper-bismuth, copper-selenium, copper-mixed rare earth, phosphorus-copper master alloys in an intermediate frequency furnace according to the material composition ratio and feeding sequence, and stir After uniformity, it is cast into a φ55×180mm billet. After the billet is cut to length, it is extruded at 670°C and cold-drawn with a small amount of deformation to make a φ15mm bar. The tensile strength of the lead-free free-cutting bismuth brass alloy produced in this embodiment is 475MPa, the hardness is HB134, and the relative machinability is about 74%.

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Abstract

The invention discloses a lead-free free-cutting bismuth-brass alloy, and belongs to the technical field of metallic material manufacture. The alloy comprises the following components by weight percentage: 58.0 to 62.0 percent of Cu, 0.6 to 2.0 percent of Bi, 0.01 to 1.7 percent of Sn and / or Se, 0.05 to 0.6 percent of Al, 0.01 to 0.1 percent of P, 0.03 to 0.08 percent of RE, and the balance beingZn and inevitable impurities, wherein content of lead in the impurities is less than 0.1 percent. The alloy has the advantages of excellent cutting property, mechanical property, corrosion resistanceand plastic forming property, and can be widely applied in the industries such as automobile, clock, electric appliance, lock making, toy, sanitary ware, and the like.

Description

technical field [0001] The invention relates to a lead-free free-cutting bismuth brass alloy, which belongs to the technical field of metal material manufacturing. Background technique [0002] Leaded brass (containing 1 to 3.7% Pb) has good cutting performance, corrosion resistance and hot and cold forming properties, and is widely used in automobiles, watches, electrical appliances, locks, toys, sanitary ware and other industries. However, due to the low solid solubility of lead in brass, most of them are distributed in free form, which leads to the pollution of water sources, soil, or Pollution of the atmosphere when waste is incinerated and waste is remelted. Lead is one of the heavy metals that are extremely harmful to the human body, and lead is not easy to remove after being discharged into the environment, and accumulates in the environment, which is very easy to produce toxic effects on organisms and humans. Therefore, all countries in the world attach great impor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/04
Inventor 闫晓东彭海健卢晓军李德富
Owner 厦门火炬特种金属材料有限公司
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