Bearing steel and preparation method thereof

A bearing steel and molten steel technology, applied in the steel field, can solve the problems of shortening the initiation period of fatigue cracks, difficult deformation, and reducing bearing fatigue life.

Pending Publication Date: 2021-04-16
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the service conditions of the bearing, under the action of alternating stress, the inclusions are likely to cause stress concentration and become the source of fatigue cracks, reducing the fatigue life of the bearing
Especially for hard and brittle inclusions, such as Al arranged in strings or point chains along the rolling direction 2 o 3 Inclusio...

Method used

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  • Bearing steel and preparation method thereof
  • Bearing steel and preparation method thereof
  • Bearing steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The present embodiment provides a kind of bearing steel, and its composition is listed in Table 1, and the preparation method of this bearing steel comprises the following steps:

[0037] (1) Converter smelting steps: During the tapping process of the converter, 120kg of effective aluminum is added to the molten steel to deoxidize the molten steel, and 800kg of steelmaking conditioner and 400kg of lime are added to slag.

[0038] (2) LF furnace refining step: when the LF furnace arrives at the station, add 404kg of lime; after the first sampling, adjust the Al content to 0.040%.

[0039] (3) RH vacuum degassing step: the processing time of the molten steel in an environment with a vacuum degree ≤ 266pa is 25 minutes, and the soft blowing time is 41 minutes.

[0040] (4) Continuous casting step: control the superheat of molten steel to 28°C, use 630A / 2.5Hz process conditions for electromagnetic stirring inside the crystallizer, and use 600A / 4Hz process conditions for ele...

Embodiment 2

[0042] The present embodiment provides a kind of bearing steel, and its composition is listed in Table 1, and the preparation method of this bearing steel comprises the following steps:

[0043] (1) Converter smelting steps: During the tapping process of the converter, 120kg of effective aluminum is added to the molten steel to deoxidize the molten steel, and 800kg of steelmaking conditioner and 400kg of lime are added to slag.

[0044] (2) LF furnace refining step: when the LF furnace arrives at the station, add 414kg of lime; after the first sampling, adjust the Al content to 0.040%.

[0045] (3) RH vacuum degassing step: the processing time of the molten steel in an environment with a vacuum degree ≤ 266pa is 25 minutes, and the soft blowing time is 34 minutes.

[0046] (4) Continuous casting step: control the superheat of molten steel to 32°C, use 630A / 2.5Hz process conditions for electromagnetic stirring inside the crystallizer, and use 600A / 4Hz process conditions for ele...

Embodiment 3

[0048] This embodiment provides a bearing steel whose composition is listed in Table 1. The preparation method of the bearing steel is the same as that of the bearing steel in Embodiment 1.

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Abstract

The invention discloses bearing steel and a preparation method thereof, and belong to the technical field of steel. The bearing steel comprises the following components in percentage by weight: 0.52-0.58% of C, 0.15-0.35% of Si, 0.75-0.90% of Mn, 0.025% or less of P, 0.015% or less of S, 0.20% or less of Ni, 0.10-0.20% of Cr, 0.10% or less of Mo, 0.20% or less of Cu, 0.050% or less of Al, 0.0030% or less of Ti, 0.04-0.10% of V, 0.004-0.011% of N, 0.0012% or less of O, and the balance Fe and inevitable impurities. The preparation method of the bearing steel sequentially comprises the steps of converter smelting, refining, RH vacuum degassing, continuous casting and heating rolling. According to the bearing steel, the non-metallic inclusion content is low, and meanwhile mechanical properties and surface quality are good.

Description

technical field [0001] The present application relates to the technical field of iron and steel, in particular, to a bearing steel and a preparation method thereof. Background technique [0002] At present, the carbon wheel bearing steel G55, C56E2 and other products at home and abroad, due to the limitations of product quality, such as purity, mechanical properties, etc., cannot fully meet the needs of high-end automobile users for steel for wheel hub bearings, so the product performance is better. The development of steel for hub bearings is imminent. [0003] Non-metallic inclusions in steel can disrupt the continuity and uniformity of the metal. According to the service conditions of the bearing, under the action of alternating stress, the inclusions are easy to cause stress concentration, become the source of fatigue cracks, and reduce the fatigue life of the bearing. Especially for hard and brittle inclusions, such as Al arranged in strings or point chains along the ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50C22C33/04
Inventor 胡昭锋邓湘斌刘年富黄铸铭张正波王生虎李学保蒋国强李健杜欣戴坚辉
Owner BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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