Roller ring for rail beam rolling and straightening and manufacturing method thereof

Abstract

The invention discloses a roll ring for rolling and straightening a track beam, and a manufacturing method for the same. The outer layer of the roll ring comprises the following chemical constituents in percentage by weight: 1.60-2.10% of C, 0.40-1.20% of Si, 0.50-1.20% of Mn, not greater than 0.10% of P, not greater than 0.05% of S, 12.0-15.0% of Cr, 0.20-1.20% of Ni, 1.50-3.00% of Mo, and 0.50-1.50% of V; the core part of the roll ring comprises the following chemical constituents in percentage by weight: 1.20-1.60% of C, 1.50-2.00% of Si, 0.50-1.20% of Mn, not greater than 0.10% of P, not greater than 0.05% of S, and not greater than 0.50% of Cr. According to the roll ring and the manufacturing method for the same disclosed by the invention, a process method of centrifugal composite casting is used, and a tempering treatment is performed; the prepared roll ring has the characteristics of being high in wear resistance and high in strength, and is suitable for straightening the track beam of a heavy track.

Description

technical field [0001] The invention relates to a roll ring and a manufacturing method thereof, in particular to a straightening roll ring suitable for section steel, especially a heavy rail straightening machine, and a manufacturing method thereof. Background technique [0002] The straightness of the rail beam is one of the important indicators of the production of the rail beam. The reason is that once the straightness of the rail beam is not good, it will directly lead to severe vibration during the operation of the locomotive, and the force of the rail beam will double, which will not only seriously damage the Rail beams and rolling stock components affect the increase of train speed, and even cause safety accidents such as train derailment and overturning. Therefore, the straightness of the rail beam needs to be corrected during the production process, and the rail beam correction needs to be carried out by rail beam straightening equipment. Among them, the roller str...

AI Technical Summary

Problems solved by technology

The temperature when the rail beam is straightened is generally ≤80°C, but because the material of the rail beam is generally U70~74, the tensile strength of this series of materials is ≥885MPa, and the yield strength is about 450~490Mpa, so the rail during the straightening process The deformation resistance of the beam is large, and the roll ring made of ordinary materials has the disadvantage of being unable to withstand the huge deformation resistance. Therefore, the roll rings for rail beam straightening machines at home and abroad are generally made of alloy forged steel such as 9Cr, 9Cr2, and Cr12MoV. High strength and good toughness

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