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High-toughness carburized bearing steel with ultra-long contact fatigue life and preparation method thereof

A tough carburized bearing, contact fatigue technology, applied in the field of alloy steel, to achieve the effect of high bending fatigue strength limit, fine structure, and impact load

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, the comprehensive mechanical properties and ultra-long contact fatigue properties obtained based on composition and process optimization have not been reported yet.

Method used

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  • High-toughness carburized bearing steel with ultra-long contact fatigue life and preparation method thereof
  • High-toughness carburized bearing steel with ultra-long contact fatigue life and preparation method thereof
  • High-toughness carburized bearing steel with ultra-long contact fatigue life and preparation method thereof

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Embodiment Construction

[0025] According to the chemical composition range designed by the present invention, 4 furnaces (number 1-4) of the invention steel were smelted on a 400kg vacuum induction furnace and a vacuum consumable furnace, and in addition 3 groups of Cr-Ni-Mo comparison steel (number 5-7) , No. 5 is 20GrNiMo, No. 6 is 18Gr2Ni4Mo, and No. 7 is 20Gr2Ni4A. The specific chemical composition is shown in Table 1. The content of P and S elements in the invention steel is significantly lower than that of the comparison steel.

[0026] Invention Steel first carries out the ratio of alloying elements on the basis of selected low-phosphorus-sulfur raw materials. Through vacuum smelting, it is cast into ingots. The diameter of the ingot is not less than Φ360mm. The temperature is 1050°C, the final forging (rolling) temperature is 880°C, and finally rolled into Φ120 and Φ85 bars. Invention steel and comparison steel were processed into standard room temperature tensile specimens, Charpy notch impa...

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Abstract

The invention relates to a high-toughness carburized bearing steel with ultra-long contact fatigue life and a preparation method thereof, belonging to the technical field of alloy steel. The steel comprises the following chemical components in percentage by weight: 0.16-0.24% of C, at most 0.10% of Si, at most 0.10% of Mn, 0.30-1.50% of Cr, 1.5-4.5% of Ni, 0.30-1.50% of Mo, 0.02-0.10% of Nb, 0.3-0.9% of V, and the balance of Fe and inevitable impurities, wherein [N]+[O]+[H]+P+S<=0.0080%, and Ti<=0.0030%. The invention particularly relates to a high-toughness carburized bearing steel which has the advantages of high shock resistance load, stable dimension and ultra-long contact fatigue life in the serve process. Compared with the prior art, the invention has the advantages of high surface hardness, high core toughness, high dimensional stability, high bending fatigue strength limit and ultra-long contact fatigue life.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and in particular provides a high-strength and tough carburized bearing steel with super-long contact fatigue life and a preparation method. Background technique [0002] As a key component of the transmission system of high-speed trains, special vehicles, metallurgical and engineering machinery, bearings are not only the constraints on the performance, life and reliability of the whole machine, but also affect the stability and safety of the whole machine. As the transmitted energy increases, the speed, temperature and life increase, especially the strong impact of the wheel-set bearings caused by the severe snaking motion of the high-speed train and the high impact load of the rolling mill bearings, requiring the bearings to have higher load-carrying capacity, that is, bearing steel The core has high strength and toughness, and the surface is super-hardened; the bearing can work continuousl...

Claims

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Application Information

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IPC IPC(8): C22C38/48C21D8/00C23F17/00
Inventor 杨卯生周清跃张斌俞峰李建新刘丰收何金光赵开礼
Owner CENT IRON & STEEL RES INST
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