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Electric automobile gear steel free of carbide bainite and production method of electric automobile gear steel

An electric vehicle and bainite technology, applied in the field of gear steel, can solve the problems of high energy consumption in the quenching and tempering process, difficult deformation control of quenching and heat treatment, etc., and achieve the effects of improving service life, reducing energy consumption and cost, and improving quietness.

Active Publication Date: 2020-07-31
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

[0008] The purpose of the present invention is to overcome the deficiencies such as high energy consumption in the quenching and tempering process and difficult deformation control in quenching heat treatment commonly found in existing gear steels. The present invention introduces carbide-free bainite steel and adopts a new high-silicon and aluminum-containing component The system and production process have completely revolutionized the gear steel composition system and metallographic structure, providing a carbide-free bainite electric vehicle gear steel and its production method, and realized the pioneering of gear steel without quenching and tempering and almost no deformation result
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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  • Electric automobile gear steel free of carbide bainite and production method of electric automobile gear steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The chemical composition of electric vehicle gear steel 1 without carbide bainite is calculated by weight percentage: C: 0.21wt%, Si: 1.75wt%, Mn: 1.50wt%, Al: 3.7wt%, P: 0.008wt% %, S: 0.007wt%, Mo: 0.12wt%, Cr: 0.80wt%, Nb: 0.065wt%, and the rest are Fe and unavoidable impurities. The production method of the above-mentioned carbide-free bainite electric vehicle gear steel 1, the method is smelted according to the above-mentioned chemical composition according to traditional smelting to obtain the electric vehicle gear steel 1 whose microstructure is carbide-free bainite, wherein,

[0032] 1) In the process of billet casting, controlled rolling and controlled cooling are carried out after being heated by the heating furnace: conventional rolling is carried out according to the cross section of the billet and the size of the finished product. -1 The deformation rate is the last 10% deformation rolling, and the final rolling temperature is 850°C;

[0033] 2) After roll...

Embodiment 2

[0036] The chemical composition of electric vehicle gear steel 2 without carbide bainite is calculated by weight percentage: C: 0.22wt%, Si: 1.78wt%, Mn: 1.48wt%, Al: 3.6wt%, P: 0.005wt% %, S: 0.007wt%, Mo: 0.13wt%, Cr: 0.85wt%, Nb: 0.055wt%, and the rest are Fe and unavoidable impurities.

[0037] The above-mentioned production method of carbide-free bainite electric vehicle gear steel 2, the method is smelted according to the above-mentioned chemical composition according to traditional smelting to obtain the electric vehicle gear steel 2 whose microstructure is carbide-free bainite, wherein,

[0038] 1) In the process of billet casting, controlled rolling and controlled cooling are carried out after being heated by the heating furnace: conventional rolling is carried out according to the cross section of the billet and the size of the finished product, the temperature in the finishing rolling stage is 920°C, and the -1 The deformation rate is the last 10% deformation rollin...

Embodiment 3

[0042] The chemical composition of electric vehicle gear steel 3 without carbide bainite is calculated by weight percentage: C: 0.24wt%, Si: 1.82wt%, Mn: 1.50wt%, Al: 3.6wt%, P: 0.006wt% %, S: 0.007wt%, Mo: 0.13wt%, Cr: 0.85wt%, Nb: 0.065wt%, and the rest are Fe and unavoidable impurities.

[0043] The production method of the above-mentioned carbide-free bainite electric vehicle gear steel 3, the method is smelted according to the above-mentioned chemical composition according to traditional smelting to obtain the electric vehicle gear steel 3 whose microstructure is carbide-free bainite, wherein,

[0044] 1) In the billet casting process, controlled rolling and controlled cooling are carried out after being heated by the heating furnace: conventional rolling is carried out according to the billet section and finished product size, the temperature in the finishing rolling stage is 930°C, and the temperature is 4S -1 The deformation rate is the last 10% deformation rolling, an...

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Abstract

The invention discloses electric automobile gear steel free of carbide bainite and a production method of the electric automobile gear steel. Chemical components of the electric automobile gear steelcomprise, by weight percent, 0.20-0.25wt% of C, 1.70-1.85wt% of Si, 1.35-1.55wt% of Mn, 3.1-3.9wt% of Al, not larger than 0.01wt% of P, not larger than 0.01wt% of S, 0.1-0.14wt% of Mo, 0.7-0.9wt% of Cr, 0.05-0.07wt% of Nb and the balance Fe and inevitable impurities. The steel free of carbide bainite is innovatively introduced, a high-Si and Al-containing brand-new component system and productionprocess are adopted, the component system and the metallographic structure of the gear steel are reformed comprehensively, a brand-new solution scheme is provided for development of gear steel of a new generation, and the groundbreaking result of avoiding thermal refining and almost avoiding deformation of the gear steel is achieved.

Description

technical field [0001] The invention relates to gear steel and a production method thereof, belonging to steel (long material) for auto parts and a production method thereof, in particular to a carbide-free bainite-free electric vehicle gear steel and a production method thereof. Background technique [0002] In March 2012, the Ministry of Science and Technology released the "Twelfth Five-Year Special Plan for Electric Vehicle Technology Development" to formally establish the "pure electric drive" (including: PHEV, EV, FCEV, REEV, etc.) technology transformation strategy, and it has never wavered since then. Compared with traditional cars, electric vehicles cancel the engine, clutch, transmission, exhaust and other systems, adopt a new electrified drive mode, and serve in a new environment for parts and components: high speed, high torque, and data show that the motor speed and torque exceed traditional car engines3 Times, parts service environment is more severe. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/34C22C38/26C22C38/22C22C38/06C22C38/04C22C38/02C21D8/00
CPCC21D8/005C21D2211/002C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/34C22C38/38
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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