Carburized bearing steel for high-speed railways and preparation method thereof

A carburizing bearing and high-speed railway technology, applied in the field of railway steel

Active Publication Date: 2011-10-26
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, based on composition design and control, microalloying and thermal processing, heat treatment and carburizing process optimization and control, the comprehensive mechanical properties of bearing materials have not been reported.

Method used

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  • Carburized bearing steel for high-speed railways and preparation method thereof
  • Carburized bearing steel for high-speed railways and preparation method thereof

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Embodiment Construction

[0027]According to the chemical composition range designed by the present invention, 5 furnaces (furnace number 1~5) of invention steel and 5 furnaces of contrast steel (furnace number 6~10) were smelted on 400kg vacuum induction furnace and vacuum consumable furnace. The composition is shown in Table 1. The chemical composition of the invented steel (furnace No. 1-5) is basically the same, and its Ni content varies in the range of 2-3%. V, only 0.06% Nb is added, No. 7 and No. 8 comparative steels have higher S and P, and no V and Nb microalloying elements are added, and No. 8 comparative steel has higher Cr and Ni alloying elements. The steel is vacuum smelted, poured into ingots, forged and billeted, and rolled into Φ120 bars. The starting forging temperature is 1050°C, and the final forging temperature is 880°C. Annealed at 600°C after hot working. Sampling and processing into standard room temperature tensile specimens, Charpy notch impact specimens, hardness specimens,...

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Abstract

The invention relates to a carburized bearing steel for high-speed railways and a preparation method thereof, belonging to the technical field of steel for railways. The bearing steel comprises the following chemical elements in percentage by weight: 0.18-0.24% of C, at most 0.10% of Si, at most 0.10% of Mn, at most 0.01% of P, at most 0.005% of S, 0.5-2.0% of Cr, 1.5-4.5% of Ni, 0.3-1.5% of Mo, 0.02-0.10% of Nb, 0.3-0.9% of V, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: proportioning and controlling the components; carrying out vacuum smelting; carrying out hot working on a steel ingot to obtain a steel product; carrying out surface carburized hardening treatment on the steel product; and carrying out heat treatment on the steel product. The invention satisfies the requirements in the service process of the bearing steel for high-speed trains, and implements good cooperation of high surface hardness and high core strength/toughness.

Description

technical field [0001] The invention belongs to the technical field of railway steel, and in particular relates to a carburized bearing steel for high-speed railway and a preparation method thereof. Background technique [0002] With the development of high-speed and heavy-duty railway transportation, bearings, as the key components of the mechanical transmission system of high-speed trains, not only restrict the performance, life and reliability of bogies, but also affect the stability and safety of the entire vehicle . With the increase of load, speed, temperature and service life, especially the impact of wheel-set bearings caused by the severe snaking motion of high-speed trains, the bearings are required to have higher load-carrying capacity, that is, the bearing steel core has high strength and toughness, and the surface is super-hardened; high-speed trains Bearings can work continuously, stably and reliably for a long time under high-speed and high-impact conditions....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C33/04C23F17/00
Inventor 杨卯生张斌周清跃俞峰刘丰收李建新吉传波赵国防
Owner CENT IRON & STEEL RES INST
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