Preparation method of high-strength and high-conductivity copper-magnesium alloy contact wire suitable for 400 km / h high-speed rail

By improving the manufacturing process of copper-magnesium alloy contact wires, adopting air atmosphere induction heating preheating and optimizing the extrusion mold cavity structure, the contradiction between the strength and conductivity of copper alloy contact wires at high-speed rail was resolved, realizing the preparation of high-strength and high-conductivity copper-magnesium alloy contact wires suitable for 400km/h high-speed rail lines.

CN117139404BActive Publication Date: 2026-07-24TIEKE JINHUA TESTING CENT CO LTD +4
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TIEKE JINHUA TESTING CENT CO LTD
Filing Date
2023-08-25
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing copper alloy contact wires cannot simultaneously meet the requirements of high strength and high conductivity during the process of increasing the speed of high-speed rail, and the existing preparation methods are costly and have strict equipment requirements.

Method used

By improving the upward continuous casting and continuous extrusion processes, using induction heating preheating in an air atmosphere, and optimizing the extrusion die cavity structure, a high-strength, high-conductivity copper-magnesium alloy contact wire that meets railway industry standards was produced.

Benefits of technology

The copper-magnesium alloy contact wire achieved a tensile strength of over 570MPa and a conductivity of over 70% IACS, meeting the requirements of 400km/h high-speed rail lines, while reducing production costs and equipment requirements.

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Abstract

The application discloses a preparation method of a copper-magnesium alloy and the copper-magnesium alloy prepared by the method. The copper-magnesium alloy comprises the following components in percentage by mass: Mg 0.30-0.70%, P≤0.01%, the total amount of other elements except Mg, P and Cu≤0.10%, and the balance being Cu. The preparation method of the copper-magnesium alloy comprises the following steps: I. preparing materials; II. smelting by a furnace and up-drawing continuous casting to obtain a copper-magnesium alloy casting rod; III. preheating: continuously preheating the copper-magnesium alloy casting rod obtained in the step II in an air atmosphere, so that the temperature of the copper-magnesium alloy casting rod reaches 200-250 DEG C; IV. continuously extruding: immediately introducing the preheated copper-magnesium alloy casting rod into a continuous extruder to obtain an extruded rod by extrusion; the outlet diameter of the continuous extruder is 1.1-2 times the inlet diameter, the volume of the extrusion die cavity is 35-40 cm 3 ; V. multi-pass drawing to obtain a copper-magnesium alloy wire with a required cross-sectional size. The application further discloses application of the copper-magnesium alloy wire in preparing a contact wire and / or a load-bearing cable of a high-speed railway track with a speed of 400 km / h or a speed of 300-350 km / h.
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