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Bearing steel and production method thereof, and bearing ring and production method thereof

A production method and technology of bearing rings, applied in the field of bearing rings and their production, bearing steel and its production, can solve the problems that cannot meet the requirements of level 1 stably

Pending Publication Date: 2022-03-25
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for ferrules with a wall thickness > 12mm, the troostite structure after heat treatment cannot stably meet the first-level requirements of JB / T1255

Method used

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  • Bearing steel and production method thereof, and bearing ring and production method thereof
  • Bearing steel and production method thereof, and bearing ring and production method thereof
  • Bearing steel and production method thereof, and bearing ring and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] 1. The production process of bearing steel is as follows:

[0086] (1) Part of the raw materials are first smelted in the converter, and then other raw materials are added for LF refining outside the furnace. Wherein, the total composition of the raw materials added above satisfies the composition shown in Table 1.

[0087] (2) RH vacuum degassing.

[0088] (3) Billet continuous casting.

[0089] The whole process adopts closed protective pouring to avoid secondary oxidation of molten steel. The cross-sectional dimensions of the slab are shown in Table 2.

[0090] In the billet continuous casting, secondary cooling is performed on the casting slab with liquid core; and the conditions of the secondary cooling include: cooling in four stages from top to bottom, and the amount of water cooled in four stages from top to bottom They account for 40%, 30%, 20%, and 10% of the total cooling water respectively.

[0091] In the secondary cooling, the slab with the liquid cor...

Embodiment 2

[0105] According to the method of Example 1, the difference is that the process conditions of the soft reduction are different. Specifically, the first soft reduction is carried out at a distance of 19 meters from the upper mouth of the crystallizer along the length extension direction of the slab. , and control the solid phase rate to 0.65, the reduction rate to 0.6mm / m, and the reduction amount accounts for 16% of the total reduction amount; carry out the second light reduction at a distance of 24 meters from the upper mouth of the crystallizer, and control the solid phase The reduction rate is 0.84, the reduction rate is 2mm / m, and the reduction accounts for 55% of the total reduction; the third light reduction is carried out at a distance of 27 meters from the upper mouth of the crystallizer, and the solid phase rate is controlled to be 0.98, and the reduction The rate is 2.6mm / m, and the reduction accounts for 29% of the total reduction; and it is carried out according to ...

Embodiment 3

[0108] According to the method of Example 1, the difference is that the process conditions of the soft reduction are different. Specifically, the first soft reduction is carried out at a distance of 21 meters from the upper mouth of the crystallizer along the length extension direction of the slab. , and the solid phase rate is controlled to 0.6, the reduction rate is 1mm / m, and the reduction accounts for 24% of the total reduction amount; the second light reduction is carried out at a distance of 22 meters from the upper mouth of the crystallizer, and the solid phase rate is controlled is 0.72, the reduction rate is 2.5mm / m, and the reduction accounts for 45% of the total reduction; the third light reduction is carried out at a distance of 25 meters from the upper mouth of the crystallizer, and the solid phase ratio is controlled to be 0.85, and the reduction The rate is 3mm / m, and the reduction accounts for 31% of the total reduction; and it is carried out according to the pr...

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Abstract

The invention belongs to the technical field of metallurgy continuous casting, and particularly relates to bearing steel and a production method thereof and a bearing ring and a production method thereof, the production method of the bearing steel comprises soft reduction, and the process comprises the following steps: soft reduction is carried out at the position 19-21 m away from an upper opening of a crystallizer, the solid phase rate is controlled to be larger than or equal to 0.5 and smaller than 0.7, the reduction rate is controlled to be 0.5-1 mm / m, and the reduction amount accounts for 15-25% of the total reduction amount; slightly pressing at a position 22-24 meters away from an upper opening of a crystallizer, controlling the solid fraction to be greater than or equal to 0.7 and less than 0.85, controlling the pressing rate to be 2-2.5 mm / m, and controlling the pressing amount to be 45-55% of the total pressing amount; and gently pressing at a position 25-27 meters away from an upper opening of the crystallizer, controlling the solid fraction to be more than or equal to 0.85 and less than 0.1, controlling the pressing rate to be 2.5-3 mm / m, and controlling the pressing amount to be 20-40% of the total pressing amount. The bearing ring provided by the invention can stably meet the first-level requirement of JB / T1255, and the fatigue life of the bearing ring is prolonged.

Description

technical field [0001] The invention belongs to the technical field of metallurgical continuous casting, and in particular relates to a bearing steel and a production method thereof, a bearing ring and a production method thereof. Background technique [0002] GCr15 bearing steel is the most widely used product in the high-carbon chromium bearing steel series, and is often used to manufacture various types of bearing rings. During the heat treatment process of the ring, different degrees of troostite will be produced, which will affect the fatigue life of the bearing. [0003] At present, the bearing rings made of GCr15 material, the rings with a wall thickness of ≤12mm, and the troostite structure after heat treatment can meet the first-level requirements of JB / T1255. However, for ferrules with wall thickness > 12mm, the troostite structure after heat treatment cannot stably meet the level 1 requirements of JB / T1255. Contents of the invention [0004] The purpose of ...

Claims

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Application Information

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IPC IPC(8): B22D11/16B22D11/22C21D1/18C21D1/32C21D6/00C21D8/00C21D9/40C22C33/04C22C38/02C22C38/04C22C38/20C22C38/22C22C38/28C22C38/42C22C38/44C22C38/50
CPCB22D11/16B22D11/225C22C33/04C22C38/02C22C38/04C22C38/20C22C38/42C22C38/22C22C38/44C22C38/28C22C38/50C21D1/32C21D1/18C21D6/002C21D6/004C21D6/005C21D6/008C21D8/005C21D9/40Y02P10/20
Inventor 邓湘斌胡昭锋刘年富黄铸铭吴学兴张正波廖美华钟凡何健楠
Owner BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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