Medium-carbon niobium-vanadium microalloying high-speed wheel steel and wheel preparation method

Abstract

The invention discloses medium-carbon niobium-vanadium microalloying high-speed wheel steel and a wheel preparation method, and belongs to the field of railway wheel preparation. The medium-carbon niobium-vanadium microalloying high-speed wheel steel aims to solve the problems of poor adaptability and low strength and hardness of high-speed wheel steel in the prior art. The medium-carbon niobium-vanadium microalloying high-speed wheel steel comprises the following components of, by weight, 0.52%-0.56% of C, 0.15%-0.40% of Si, 0.50%-0.80% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, 0.01%-0.03% of Nb, 0.10%-0.20% of V and the balance Fe and inevitable impurity elements. According to the medium-carbon niobium-vanadium microalloying high-speed wheel steeland the wheel preparation method, Nb and V elements are added to form a brand new component design system, and a corresponding heat treatment process is matched, so that the strength and hardness levels of a wheel are improved by more than 5% compared with those of an ER8 wheel on the premise that the toughness index of the wheel is not reduced, the contact fatigue resistance and the wear resistance are also improved, and the adaptability of the wheel is stronger.

Description

technical field

[0001] The invention belongs to the technical field of railway wheel preparation, and more specifically relates to a medium-carbon niobium vanadium microalloyed high-speed wheel steel and a method for preparing the wheel. Background technique

[0002] my country's high-speed railway development has achieved world-renowned achievements, and the key components of high-speed trains have also achieved independent innovation. At present, my country's high-speed wheels are mainly ER8 wheels in the European standard EN13262, which are made of medium-carbon carbon steel and have high fracture toughness (≥70MPa m 1 / 2 ) to ensure service safety. The structure of ER8 wheel is a small amount of discontinuous reticular ferrite + lamellar pearlite, in which ferrite is a soft phase with good toughness and low yield strength, and pearlite has high strength but poor toughness. The matching relationship determines the final performance of the material. The yield strength of...

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