Railway axle

Abstract

Provided is a railway axle having an excellent fatigue limit and fatigue notch coefficient, the railway axle having a composition containing, in mass%, 0.20-0.35% of C, 0.20-0.65% of Si, 0.40-1.20% of Mn, 0.020% or less of P, 0.020% or less of S, 0-0.30% of Cu, 0-0.30% of Ni, 0-0.30% of Cr, 0-0.08% of Mo, 0-0.100% of Al, 0.0200% or less of N, 0-0.060% of V, and 0-0.020% of Ti, the remainder being Fe and impurities, and satisfying formulae (1) and (2). 0.58 < = C + Si / 8 + Mn / 5 + Cu / 10 + Cr / 4 + V < = 0.67 (1); Si + 0.9 Cr > = 0.50 (2), and each element symbol in the formula (1) and the formula (2) is substituted into the corresponding element content (mass%).

Description

[0001] This application is a divisional application of an application with an application date of February 25, 2015, an application number of 201580010223.9, and an invention title of "Axle for Railway". technical field [0002] The present invention relates to railway axles. Background technique [0003] Railroads use axles to support the weight of the vehicles. Furthermore, the railway axle receives a force in the horizontal direction generated by the contact between the wheels and the rail every time the vehicle passes (curves) the curved rail. That is, every time the wheel rotates, the railway axle is repeatedly subjected to rotational and bending stress. Also, when the curve passes, the amplitude of the bending stress becomes large. [0004] A high fatigue limit is required for such railway axles. In particular, the axle needs to be structurally designed to cooperate with wheels, gears, and bearings. Known: The mating part suffers damage from slight to fatigue. In ...

AI Technical Summary

Problems solved by technology

However, the fatigue notch factor, an indicator of safety, has not been studied

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