Steel for freight train connecting piece and preparation method thereof

Abstract

The invention provides steel for a freight train connecting piece and a preparation method thereof. The steel for the freight train connecting piece comprises the following chemical ingredients in percentage by mass: 0.24-0.28 percent of C, 0.20-0.40 percent of Si, 1.20-1.50 percent of Mn, 0.50-0.65 percent of Cr, 0.45-0.65 percent of Ni, 0.20-0.30 percent of Mo, 0.03-0.05 percent of Ti, 0.025-0.040 percent of Al, less than or equal to 0.020 percent of S, less than or equal to 0.020 percent of P, less than or equal to 0.15 percent of Cu, less than or equal to 15 ppm of O, less than or equal to 1.5 ppm of H and the balance of Fe and inevitable impurities. According to the invention, as the steel for the freight train is adopted, the mechanical properties of strength, low-temperature impact performance, fatigue life and the like of the connecting piece can be improved, so that the development of railway vehicles towards the high-speed heavy-load direction can be improved, and railway accidents caused by the connecting piece are reduced or avoided.

Description

technical field [0001] The invention belongs to the technical field of alloy structural steels, in particular, the invention relates to a steel for freight train connectors and a preparation method thereof. Background technique [0002] The freight train connector is an important part of the railway vehicle installation, and it directly completes the transmission of the longitudinal force between the vehicles when the vehicles are towed, connected and buffered. The connecting parts of trains are used in harsh conditions and are subject to strong impact, especially in winter, they are prone to breakage. Judging from the inspection and maintenance of freight cars currently in operation, about 70% of the problems occur on the connecting parts of freight cars. The comprehensive mechanical properties, low-temperature impact properties and fatigue life of steel used in freight trains are more demanding. [0003] At present, some manufacturers have carried out trial production res...

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Problems solved by technology

[0004] The purpose of the present invention is mainly aimed at the fact that the comprehensive mechanical properties and low-temperature impact performance of the current freight train connectors cannot well meet the requirements of high-speed and heavy-duty railway vehicles. For this, the present invention provides a steel for freight train connectors. And the preparation method thereof improves the mechanical properties such as the strength, low-temperature impact performance, and fatigue life of the connecting piece, so as to meet the development of high-speed and heavy-duty railway vehicles, and reduce or avoid railway accidents caused by the problem of the connecting piece

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