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M50 bearing steel bar and preparation method thereof

A bearing steel, bar technology, used in metal rolling, temperature control, metal processing equipment, etc.

Active Publication Date: 2022-08-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the carbides in M50 steel, there are few researches on control methods in consumable smelting, thermal deformation control methods of consumable ingots and micro-defect control, and further research work is needed

Method used

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  • M50 bearing steel bar and preparation method thereof
  • M50 bearing steel bar and preparation method thereof
  • M50 bearing steel bar and preparation method thereof

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Effect test

preparation example Construction

[0047] On the one hand, an embodiment of the present invention provides a method for preparing an M50 bearing steel bar, which includes the following steps:

[0048] The step of preparing a consumable ingot: performing a vacuum consumable remelting process on the ingot to prepare a consumable ingot; wherein, the equivalent diameter size of a single carbide in the consumable ingot is less than 150 μm, and in the consumable ingot: carbonization The content of M2C carbide in the material is ≥95%.

[0049] In this step, the ingot refers to the ingot obtained after vacuum induction melting. Here, by controlling the vacuum consumable remelting process, the equivalent diameter size of a single carbide in the obtained consumable ingot is less than 150 μm, and in the consumable ingot: the content of M2C carbide in the carbide ≥95%.

[0050] Specifically, in this step, the depth of the center of the molten pool and the diameter of the consumable ingot are mainly controlled to be 0.5-0...

Embodiment 1

[0061] The present embodiment prepares a kind of M50 bearing steel bar, and the main steps are as follows:

[0062] The step of preparing a consumable ingot: performing vacuum consumable remelting treatment on the ingot after vacuum induction melting to prepare a consumable ingot. Specifically, a Φ380mm ingot was used as the electrode blank, and vacuum consumable remelting treatment was carried out; wherein, during the vacuum consumable remelting treatment process, the melting power was adjusted and the mold was forced to cool, and the gap was increased under the condition of water cooling of the mold. Air-cooled, so that the depth / width of the molten pool (the depth refers to the depth of the center of the molten pool; the width refers to the diameter of the consumable ingot) is controlled to be 0.65.

[0063] Wherein, the equivalent diameter size of the carbide in the consumable ingot prepared in this step is less than 150 μm.

[0064] Carbide pyrolysis treatment step: the ...

Embodiment 2

[0071] The present embodiment prepares a kind of M50 bearing steel bar, and the main steps are as follows:

[0072] The step of preparing a consumable ingot: performing vacuum consumable remelting treatment on the ingot after vacuum induction melting to prepare a consumable ingot. Specifically, a Φ350mm ingot was used as the electrode blank, and vacuum consumable remelting treatment was carried out; wherein, during the vacuum consumable remelting treatment process, the melting power was adjusted and the mold was forced to cool, and the gap was increased under the condition of water cooling of the mold. Air-cooled, so that the depth / width of the molten pool (the depth refers to the depth of the center of the molten pool; the width refers to the diameter of the consumable ingot) is controlled to be 0.55.

[0073] Wherein, the equivalent diameter size of the largest carbide in the consumable ingot prepared in this step is less than 100 μm.

[0074] Carbide pyrolysis treatment st...

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Abstract

The invention relates to an M50 bearing steel bar and a preparation method thereof, and mainly adopts the technical scheme that the preparation method of the M50 bearing steel bar comprises the following steps: carrying out vacuum consumable remelting treatment on a cast ingot to prepare a consumable ingot; wherein the equivalent diameter size of a single carbide in the consumable ingot is smaller than 150 microns, and in the consumable ingot, the content of M2C carbide in the carbide is larger than or equal to 95%; the consumable ingot is subjected to carbide high-temperature decomposition treatment, so that M2C carbide in the consumable ingot is promoted to be decomposed, and an M50 bearing steel ingot is obtained; wherein the equivalent diameter size of a single carbide in the M50 bearing steel ingot is not greater than 50 microns; and the M50 bearing steel ingot is forged and rolled in sequence, and the M50 bearing steel bar is obtained. The method is mainly used for preparing the M50 bearing steel bar with the carbide equivalent diameter being smaller than or equal to 25 micrometers and the hole microdefect being smaller than or equal to 3.8 micrometers so as to meet the service performance requirement of a long-life bearing under the severe working conditions of high speed, high temperature and large load.

Description

technical field [0001] The invention relates to the technical field of high-carbon aviation bearing steel preparation, in particular to an M50 bearing steel bar and a preparation method thereof. Background technique [0002] As the main bearing steel for aviation, M50 is widely used due to its good high temperature stability and wear resistance. [0003] In order to meet the requirements of high-speed, high-temperature, heavy-load harsh working conditions and high fatigue life service performance, high-quality bars are prepared by vacuum induction + vacuum consumable melting method and traditional forging + rolling hot deformation method. It is well known that carbides in M50 are an important factor affecting the mechanical properties of materials. Larger carbides will seriously affect the fatigue life of bearings. In addition, some micro-defects in holes also seriously affect the fatigue properties of materials. [0004] At present, in the process of manufacturing bars, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04B21J5/00B21B1/16B21B37/74C21D6/00C21D1/32C22B9/20B22D7/00
CPCB21C37/04B21J5/002B21B1/16B21B37/74C21D6/00C21D1/32C22B9/20B22D7/00Y02P10/25
Inventor 刘宏伟李殿中曹艳飞傅排先孙明月徐斌类承帅赵志坡刘航航康秀红李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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