High-strength-and-toughness anti-fatigue vanadium-niobium-containing high-speed rail axle steel and heat treatment method thereof

Abstract

The invention provides high-strength-and-toughness anti-fatigue vanadium-niobium-containing high-speed rail axle steel and a heat treatment method thereof. The high-strength-and-toughness anti-fatiguevanadium-niobium-containing high-speed rail axle steel comprises 0.14% -0.24% of C, 0.19% -0.35% of Si, 0.93% -1.30% of Mn, 1.23% -2.1% of Cr, 0.25% -0.45% of Mo, 1.30% -1.60% of Ni, 0.20% -0.50% ofCu, 0.030% -0.050% of V, 0.010% -0.040% of Nb, 0.015% -0.040% of Al, less than 0.015% of P, less than 0.015% of S, less than 0.008% of N, less than 0.004% of T.O and the balance Fe and other inevitable impurities. Pretreatment and performance heat treatment are adopted in axle heat treatment, and a produced high-speed rail axle has excellent corrosion resistance, toughness and fatigue performanceand meets the requirement for 400 kilometers per hour.

Description

technical field [0001] The invention belongs to the field of alloy steel, and in particular relates to a steel alloy suitable for tensile strength 850-1100MPa, yield strength ≥ 800MPa, -40°C KU 2 ≥200J, a high-strength, toughness, anti-fatigue, vanadium-niobium-containing high-speed rail axle steel with a speed of 400 kilometers per hour and its heat treatment method. Background technique [0002] The axle is a super-large stepped axisymmetric part with a maximum diameter of more than 200mm and a length of up to 2200mm. It forms a wheel set through an interference connection with the wheel and bears the full weight of the rolling stock. It is one of the three key parts of the railway vehicle. one. The loading state of the axle in motion is relatively complicated, not only bearing the vertical force on the spring, braking force and the reaction force of the wheel, but also bearing the impact load from the line and the guiding force acting laterally on the wheel rim when pass...

AI Technical Summary

Problems solved by technology

The disadvantage is that the anti-fatigue performance of the notched sample cannot meet the requirements of the axle at a speed of 400 kilometers per hour

[0007] At present, although my country's high-speed railway axle steel research has accumulated to a certain extent, it can only meet the requirements of trains with a speed of no more than 350 kilometers per hour, and the research on high-speed train axles with a speed of 400 kilometers per hour is almost blank.

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