A kind of aluminum alloy cable for railway and preparation method thereof

A technology of aluminum alloy and aluminum alloy conductors, which is applied to metal/alloy conductors, heat treatment equipment, and the manufacture of extensible conductors/cables. Benefit significance, high strength toughness, high production efficiency effect

Inactive Publication Date: 2020-05-12
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lightweight requirements of railway cables provide a new opportunity for replacing copper with aluminum. However, the current electrical aluminum has low strength, poor creep resistance, low elongation, and poor flexibility. The connection is easy to loose, resulting in increased contact resistance. There will be potential safety hazards during use, and it is difficult to meet the requirements of railways for cables

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An aluminum alloy cable for railways is mainly composed of Fe, Cu, B, Sc, Sr alloy elements, Cr, Mn, V, Ti impurity elements and other unavoidable impurity elements and matrix aluminum. The mass percentage of alloy elements is: 0.55% Fe, 0.2% Cu, 0.04% B, 0.03% Sc, 0.02% Sr, the content of Si element is less than 0.05%, the sum of impurity Cr+Mn+V+Ti element content is less than 0.08wt%, other The content of each impurity element is less than 0.01wt%; the rest is aluminum.

[0023] According to the chemical composition and mass percentage of the aluminum alloy cable conductor designed above, the aluminum ingot with a purity greater than 99.9% is melted, and the Al-B intermediate alloy is added when the temperature of the aluminum melt is controlled at 720 ° C. After stirring to remove impurities, the purity is 99.995. % argon for the first refining of the molten aluminum, control the temperature of the aluminum melt to 750°C, add Al-Cu, Al-Fe, Al-Sc, Al-Sr intermediate ...

Embodiment 2

[0025] An aluminum alloy cable for railways is mainly composed of Fe, Cu, B, Sc, Sr alloy elements, Cr, Mn, V, Ti impurity elements and other unavoidable impurity elements and matrix aluminum. The mass percentage of alloying elements is: 0.8% Fe, 0.35% Cu, 0.05% B, 0.04% Sc, 0.02% Sr, Si element content is less than 0.03%, impurity Cr+Mn+V+Ti element content sum is less than 0.03%, other each The content of impurity elements is less than 0.005wt%; the rest is aluminum.

[0026] According to the chemical composition of the aluminum alloy cable conductor designed above, melt the aluminum ingot with a purity greater than 99.9%, add Al-B intermediate alloy when the temperature of the aluminum melt is controlled to 735°C, stir to remove impurities, and then pass in argon gas with a purity of 99.995% The aluminum liquid is refined for the first time, and the temperature of the aluminum melt is controlled to 760°C. Al-Cu, Al-Fe, Al-Sc, and Al-Sr intermediate alloys are added, and the...

Embodiment 3

[0028] An aluminum alloy cable for railways is mainly composed of Fe, Cu, B, Sc, Sr alloy elements, Cr, Mn, V, Ti impurity elements and other unavoidable impurity elements and matrix aluminum. The mass percentage of alloying elements is: 1% Fe, 0.48% Cu, 0.065% B, 0.045% Sc, 0.025% Sr, the Si element content is less than 0.03%, the sum of impurity Cr+Mn+V+Ti element content is less than 0.03%, other The content of one impurity element is less than 0.005wt%; the rest is aluminum.

[0029] Design the chemical composition of the aluminum alloy cable conductor as above, melt the aluminum ingot with a purity greater than 99.9%, add Al-B intermediate alloy when the temperature of the aluminum melt is controlled to 735°C, stir to remove impurities, and then pass in argon gas with a purity of 99.995% The aluminum liquid is refined for the first time, and the temperature of the aluminum melt is controlled to 760°C. Al-Cu, Al-Fe, Al-Sc, and Al-Sr intermediate alloys are added, and the s...

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Abstract

The invention relates to an aluminum alloy cable for railways and a preparation method thereof, and belongs to the technical field of preparation of aluminum alloy materials, processing formation of nonferrous metal conductors and manufacturing of cables. The aluminum alloy cable is mainly prepared from aluminum, iron, copper, scandium, strontium, boron and inevitable impurity elements. A conductor is prepared by adopting continuous casting and continuous rolling as well as continuous multi-die drawing technologies, aluminum ingots, of which the purity is not less than 99.9 percent, is molten;firstly, an Al-B intermediate alloy is added into a melt mass, and primary refinement is carried out; the intermediate alloys such as iron, copper, scandium and strontium are added, the alloy elements are completely molten, stirred, subjected to secondary refinement and continuous casting and continuous rolling to be made into aluminum alloy rods and bars; the aluminum alloy rods and bars are made into wire rods by adopting the multi-die drawing technology; annealing processing is carried out, and the wire rods are made into the cable. The conductivity of the aluminum alloy cable conductor ismore than 61.2 percent IACS, and the tensile strength is more than 130MPa. According to the aluminum alloy cable for the railways and the preparation method thereof disclosed by the invention, a preparation process is simple, continuous and automatic production are easily realized, the production efficiency is high, the cost is low, and the aluminum alloy cable is suitable for industrial large-scale batch production and has the prominent economic benefit.

Description

technical field [0001] The invention belongs to the technical fields of aluminum alloy material preparation, non-ferrous metal conductor processing and cable manufacturing, and in particular relates to an aluminum alloy cable for railways and a preparation method thereof. Background technique [0002] my country's copper resources are scarce, and copper raw materials mainly rely on imports. The cable industry uses a huge amount of copper, and the copper price has remained high for a long time. The high price and huge consumption have brought a great burden to my country's cable industry. Both aluminum and copper have excellent electrical conductivity, because the price of aluminum is lower than that of copper, and the resource is abundant. As a cable material, replacing copper with aluminum and developing high-performance aluminum alloy conductors will help alleviate the current shortage of copper resources and improve cable transmission capacity. The lightweight requiremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/02H01B13/008C22C21/00C22C1/03C22F1/04C21D1/26
CPCC21D1/26C22C1/026C22C1/03C22C21/00C22F1/04H01B1/023H01B13/0016H01B13/008
Inventor 郭胜利李德富樊建中王斌晓赵鲁彬杨庆张莹王明明闫小伟
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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