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Carbide-free bainite self-reinforced gear steel and preparation method

A technology of bainite and carbide, which is applied in the field of carbide-free bainite self-strengthening gear steel and its preparation, to achieve the effects of crack propagation self-strengthening, higher strength and improved service life

Active Publication Date: 2021-08-13
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, since there is no problem of quenching deformation (no quenching and tempering process), the outer dimension of the gear can be precisely controlled, which improves the quietness of the gear, improves the stress situation, and thus brings a series of advantages

Method used

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  • Carbide-free bainite self-reinforced gear steel and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Self-strengthening gear steel 1 without carbide bainite, its chemical composition is calculated by weight percentage: C: 0.13wt%, Si: 0.93wt%, Mn: 1.50wt%, Al: 3.7wt%, P: 0.005 wt%, S: 0.005wt%, W: 0.25wt%, V: 0.065wt%, the rest is Fe and unavoidable impurities.

[0030] The preparation method of the above-mentioned carbide-free bainite self-reinforced gear steel 1, the method is smelted according to the above-mentioned chemical composition according to traditional smelting to obtain a self-reinforced gear steel whose microstructure is carbide-free bainite, wherein,

[0031] 1) During the billet casting process, controlled rolling and controlled cooling are carried out after being heated by the heating furnace: the temperature in the finishing rolling stage is controlled at 890°C, and the temperature is controlled at 3S -1 The deformation rate is the last 10% deformation rolling, and the final rolling temperature is 850°C;

[0032] 2) After rolling, the finished produc...

Embodiment 2

[0035] Carbide-free bainite self-strengthening gear steel 2, its chemical composition is calculated by weight percentage: C: 0.12wt%, Si: 0.85wt%, Mn: 1.43wt%, Al: 3.5wt%, P: 0.005 wt%, S: 0.005wt%, W: 0.25wt%, V: 0.068wt%, the rest is Fe and unavoidable impurities.

[0036] The preparation method of the above-mentioned carbide-free bainite self-strengthening gear steel 2, the method is smelted according to the above-mentioned chemical composition according to the traditional smelting to obtain the self-strengthening gear steel whose microstructure is carbide-free bainite, wherein,

[0037] 1) During the billet casting process, controlled rolling and controlled cooling are carried out after being heated by the heating furnace: the temperature in the finishing rolling stage is controlled at 930°C, and the temperature is controlled at 3S -1 The deformation rate is the last 10% deformation rolling, and the final rolling temperature is 830°C;

[0038] 2) After rolling, the finish...

Embodiment 3

[0041] Carbide-free bainite self-strengthening gear steel 3, its chemical composition is calculated by weight percentage: C: 0.13wt%, Si: 0.88wt%, Mn: 1.42wt%, Al: 3.3wt%, P: 0.005 wt%, S: 0.006wt%, W: 0.26wt%, V: 0.058wt%, the rest is Fe and unavoidable impurities.

[0042] The preparation method of the above-mentioned carbide-free bainite self-reinforced gear steel 3, the method is smelted according to the above-mentioned chemical composition according to traditional smelting to obtain a self-reinforced gear steel with a carbide-free bainite microstructure, wherein,

[0043] 1) During the billet casting process, controlled rolling and controlled cooling are carried out after being heated by the heating furnace: the temperature in the finishing rolling stage is controlled at 920°C, and the temperature is controlled at 5S -1 The deformation rate is the last 10% deformation rolling, and the final rolling temperature is 820°C;

[0044] 2) After rolling, the finished product is ...

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Abstract

The invention discloses a self-strengthening gear steel without carbide bainite and its preparation method. Its chemical composition is calculated by weight percentage: C: 0.10-0.15wt%, Si: 0.85-0.95wt%, Mn: 1.35~1.55wt%, Al: 3.1~3.9wt%, P≤0.01wt%, S≤0.01wt%, W: 0.1~0.3wt%, V: 0.05~0.07wt%, the rest is Fe and unavoidable impurities . The present invention introduces carbide-free bainite steel, adopts a new high-silicon and aluminum-containing composition system and production process, completely revolutionizes the composition system and metallographic structure of gear steel, and provides a new generation of gear steel. The solution has achieved the pioneering results of gear steel self-strengthening, no quenching and tempering treatment and almost no deformation.

Description

technical field [0001] The invention relates to gear steel and a production method thereof, and belongs to steel (long material) for auto parts and a production method thereof, in particular to a self-reinforced gear steel without carbide bainite and a preparation method thereof. Background technique [0002] China has ranked first in the world in the production and sales of new energy vehicles for five consecutive years. In 2018 and 2019, the sales volume reached 1.256 million and 1.206 million respectively, accounting for more than 50% of the global sales of new energy vehicles. Based on my country's industrial policy, China is dominated by pure electric vehicles (BEV). Compared with traditional vehicles, electric vehicles cancel the engine, clutch, transmission, exhaust and other systems, and adopt a new electrified drive mode. The new environment for parts and components: high speed , High torque, the data shows that the speed and torque of the motor are three times highe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/06C22C38/04C22C38/02C21D8/00
CPCC21D8/005C21D2211/002C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 张帆黄宗泽赵四新高加强张贤忠章军王维
Owner 武汉钢铁有限公司
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