A chrome-zirconium-copper contact wire for electrified railways and its processing technology

Abstract

The invention discloses a preparation method of an electrified railway chromium-zirconium-copper contact line. Copper is taken as a substrate, 0.30-0.70% of Cr and 0.10-0.35% of Zr in percentage by weight are added into the substrate, and the total sum of impurities is no greater than 0.05%. The preparation method comprises the following steps: performing vacuum melting and vacuum horizontal continuous casting, thereby obtaining a long-length large cross section chromium-zirconium-copper continuous cast blank; performing full hot continuous rolling and on-line solid solution, thereby obtaining a long-length chromium-zirconium-copper line rod disc; drawing and peeling the disc, and performing cold continuous rolling, thereby reducing the diameter; further performing aging treatment to reinforce the disc; further performing cold continuous rolling by using a Y-type rolling machine, thereby pre-forming the line; and finally performing fine drawing formation once. The chromium-zirconium-copper contact line produced by using the preparation process is fine and uniform in grain, free of defect, high in strength, high in conductivity and high in softening temperature, and applicable to industrialized production.

Description

technical field

[0001] The invention relates to an electrified railway contact wire, in particular to a chrome-zirconium-copper contact wire for an electrified railway and its processing technology, belonging to the technical field of electric cables. Background technique

[0002] Contact wires for electrified railways should have high strength, high electrical conductivity and high softening temperature. At present, the contact wire mainly adopts Cu-Mg, Cu-Sn, Cu-Ag alloys. Cu-Ag is a low-strength and high-conductivity alloy, which is suitable for railways with low speed; Cu-Mg and Cu-Sn are medium-strength and medium-conductivity alloys. Not an ideal contact wire alloy material. Cu-Cr-Zr is a typical high-strength and high-conductivity copper alloy, and it is generally recognized at home and abroad as the most ideal contact wire alloy material. The application of Cu-Cr-Zr alloys has been very common in other industries, and currently only Japan and China are used in hig...