High-strength high-conductivity copper alloy contact wire for rapid transit railway

A high-conductivity, high-speed railway technology, used in cable/conductor manufacturing, metal rolling, circuits, etc., can solve the problems of uneven grains, loose structure, etc., and achieve excellent thermal stability and corrosion resistance. Effect

Active Publication Date: 2006-08-02
郑茂盛 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a high-strength and high-conductivity copper alloy contact wire for high-speed railways and a preparation method thereof. The obtained contact wire has high density and no defects such as pores, segregation, and cracks, and solves the problems existing in the prior art. The loose structure and uneven grains of the contact wire greatly improve the strength, wea

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1:

[0033] Taking copper as the matrix, the components added to the copper are 0.09% silver and 0.32% chromium by total weight, and carry out atmospheric smelting.

[0034] The slag-removed alloy was semi-continuously cast to obtain a φ225mm billet at a casting temperature of 1240°C. After trimming, the billet underwent 12 passes of hot rolling to obtain a φ32.8mm billet. The rolling temperature was 910°C and the final rolling temperature was 480°C. °C;

[0035] The alloy was solution treated at 960°C for 90min. Cold rolling plastic deformation 30-50%;

[0036] After aging treatment at 480°C for 1.5 hours, 30-50% cold deformation processing is performed to obtain a round rod blank of about φ16-18mm. Pull out to get the finished double-groove railway contact line. The strength of the contact wire product can reach 570-625Mpa, the elongation rate is 6.5-7.3%, and the electrical conductivity is 82% IACS.

Example Embodiment

[0037] Embodiment 2:

[0038] Taking copper as the matrix, the components added to the copper are 0.1% silver and 0.20% chromium by total weight, and carry out atmospheric smelting.

[0039] The alloy after refining and slag removal was semi-continuously cast to obtain a φ205mm billet at a casting temperature of 1230°C. After the trimming, the billet underwent 10 passes of hot rolling to obtain a φ34mm billet. The rolling temperature was 920°C and the final rolling temperature was 510°C. ;

[0040] The alloy billet is solution-treated at a temperature of 980 °C and after 60 minutes, the cold-rolled plastic deformation is 30-50%;

[0041] After aging treatment at 480℃ for 2.0 hours, 30-50% cold deformation processing is carried out to obtain a round rod blank with a diameter of about 16-18mm. Pull out to get the finished double-groove railway contact line. The strength of the contact wire product can reach 570-620MPa. The elongation is 5.5-6.5%, while the conductivity is 84...

Example Embodiment

[0042] Embodiment three:

[0043]Taking copper as the matrix, the components added to the copper are 0.07% silver and 0.43% chromium to carry out atmospheric smelting, the smelting temperature is 1285 ° C, smelting for 1.5 hours, and then the alloy is refined and slag removed;

[0044] The alloy after refining and slag removal is semi-continuously cast to obtain a φ260mm billet at a casting temperature of 1250°C. After trimming, the billet undergoes 12 passes of hot rolling to obtain a φ34mm billet. The rolling temperature is 940°C and the final rolling temperature is 530°C. ;

[0045] The alloy is solution treated at a temperature of 980°C and plastic deformation is 30-55% after 90min;

[0046] After 2.5 hours of aging treatment at 470°C, the plastic deformation is 30-55%. A round bar blank with a diameter of about 16-18mm is obtained. According to the cross-sectional size requirements of different contact lines, after 3-6 passes of hole drawing, the finished double-groove ...

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Abstract

This invention discloses a Cu alloy contact wire of high strength and high conductivity used in high speed railways and its preparation method, in which, the contact wire is taken Cu as the matrix to be added with Ag: 0-0.15% and Cr: 0.20-0.72%. The preparation method includes: applying a hot-rolling technology to large area Cu alloys and level conticasting technology to produce large length wires or a rod ingot is solutionized then to be rolled, aged and rolled.

Description

technical field [0001] The invention relates to the technical field of casting and processing of non-ferrous metals, in particular to a high-strength and high-conductivity copper alloy contact wire for high-speed railways and a preparation method thereof. Background technique [0002] With the aggravation of railway operation tasks and increasingly fierce competition, heavy-duty and high-speed railways (above 300Km / h) have become the development trend of the world's railway industry, and railway contact lines are one of the key equipment for high-speed wheel-rail railways. The strength of pure copper and copper-silver alloy contact wires currently used is only 350-400MPa, which is only suitable for medium and low speed (below 250Km / h) railways, and is difficult to meet the service conditions of high-speed railways. [0003] The existing contact wires for medium and low-speed railways at home and abroad generally adopt upward continuous casting, combined with cold working str...

Claims

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Application Information

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IPC IPC(8): H01B5/02C22C9/00C22C1/02B21B1/46B22D11/10B22D11/16B21B3/00H01B13/00
Inventor 郑茂盛
Owner 郑茂盛
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