Copper coated steel contact wire with high strength, low relaxation and high electric conductivity for electric traction

Abstract

The invention provides a copper coated steel contact wire with high strength, low relaxation and high electric conductivity for electric traction. A copper or a copper-silver alloy layer is coated on a high-strength and low-relaxation steel core, and the obtained product is subjected to cold rolling to obtain the copper coated steel contact wire; and the tensile strength of the copper coated steel contact wire reaches more than or equal to 600 / mm<2>, and simultaneously, the electric conductivity of the contact wire reaches more than or equal to 80 percent IACS. The contact wire has the following advantages and technical effects: 1, the tensile strength reaches more than or equal to 600 / mm<2>, simultaneously, the electric conductivity of the contact wire reaches more than or equal to 80 percent IACS, the contact wire also has the high electric conductivity of the copper and high strength, low relaxation and high yield ratio of steel, and the contact wire is suitable to apply to a high speed train with the speed of more than 300 km per hour; 2, the contact wire saves a pre-tension working procedure and reduces the construction difficult in the electric grid construction; and because of low degree of relaxation, the tension of a contact wire is more stable; 3, because of good straightening property, the straightening difficult of the contact wire is reduced in the electric grid construction; 4, the service life is long; 5, the contact wire can normally work at a higher temperature (generated due to abrasion); and 6, the power receiving capability of a pantograph is enhanced.

Description

Technical field: [0001] The invention relates to a contact wire, in particular to a high-strength, low-relaxation, high-conductivity copper-clad steel contact wire for electric traction. Background technique: [0002] Railway contact wire is one of the key equipment for high-speed wheel-rail railway. With the development of high-speed and heavy-duty electrified trains, the requirements for the material and variety of contact wire are getting higher and higher. The tensile strength of the contact wire applied to the high-speed railway should be ≥600 / mm 2 At the same time, the electrical conductivity can reach ≥80% IACS. According to the above requirements, the performance indicators of the contact wires that can be produced in my country such as pure copper, copper alloys, steel-aluminum wires, etc. are only suitable for medium and low railways, and are wear-resistant and heat-resistant. The performance is not too high, the service life is relatively short, and it is difficul...

AI Technical Summary

Problems solved by technology

The tensile strength of the contact wire applied to the high-speed railway should be ≥600 / mm 2 At the same time, the electrical conductivity can reach ≥80% IACS. According to the above requirements, the performance indicators of the contact wires that can be produced in my country such as pure copper, copper alloys, steel-aluminum wires, etc. are only suitable for medium and low railways, and are wear-resistant and heat-resistant. The performance is not too high, the service life is relatively short, it is difficult to meet the requirements of high-speed railway

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