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Steel for tempering-free gear free of carbide bainite and production method of steel

A technology of bainite and carbide, which is applied in the field of gear steel, can solve the problems of high energy consumption in quenching and tempering process, difficulty in quenching heat treatment deformation control, etc., and achieve the effect of improving service life, reducing energy consumption and cost, and suppressing crack growth

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

[0007] The purpose of the present invention is to overcome the current deficiencies such as high energy consumption in the quenching and tempering process and difficult deformation control of quenching heat treatment that are common in current gear steels. The present invention introduces carbide-free bainite steel and adopts a high-silicon, aluminum-containing The new composition system and production process have completely revolutionized the composition system and metallographic structure of gear steel, providing a non-quenching and tempering gear steel without carbide bainite and its production method, and realizing the non-quenching and tempering of gear steel and almost no Morphing's groundbreaking results
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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  • Steel for tempering-free gear free of carbide bainite and production method of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] No quenching and tempering gear steel 1 without carbide bainite, its chemical composition is calculated by weight percentage: C: 0.05wt%, Si: 0.78wt%, Mn: 1.50wt%, Al: 3.7wt%, P: 0.005wt%, S: 0.006wt%, Ni: 0.20wt%, Ti: 0.028wt%, and the rest are Fe and unavoidable impurities.

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

[0031] 1) In the process of billet casting, controlled rolling and controlled cooling are carried out after being heated by the heating furnace: the temperature in the finishing rolling stage is 880°C, and the temperature is 4S -1 The deformation rate is the last 10% deformation rolling, and the final rolling temperature is 850°C;

[0032] 2) After rolling, the finished product is in the slow coo...

Embodiment 2

[0035] No quenching and tempering gear steel 2 without carbide bainite, its chemical composition is calculated by weight percentage: C: 0.03wt%, Si: 0.73wt%, Mn: 1.38wt%, Al: 3.6wt%, P: 0.005wt%, S: 0.004wt%, Ni: 0.22wt%, Ti: 0.024wt%, and the rest are Fe and unavoidable impurities.

[0036] The production method of the above-mentioned carbide-free bainite-free gear steel 2, the method is smelted according to the above-mentioned chemical composition according to traditional smelting to obtain self-strengthening gear steel 2 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 910°C, and the temperature is 4S -1 The deformation rate is the last 10% deformation rolling, and the final rolling temperature is 800°C;

[0038] 2) After rolling, the finished product is in the slow coolin...

Embodiment 3

[0041] The non-tempered gear steel 3 without carbide bainite, its chemical composition is calculated by weight percentage: C: 0.03wt%, Si: 0.74wt%, Mn: 1.46wt%, Al: 3.4wt%, P: 0.007wt%, S: 0.005wt%, Ni: 0.15wt%, Ti: 0.026wt%, and the rest are Fe and unavoidable impurities.

[0042] The production method of the aforementioned carbide-free bainite-free quenched and tempered gear steel 3, the method is smelted according to the above-mentioned chemical composition according to traditional smelting to obtain self-reinforced gear steel 3 whose microstructure is carbide-free bainite, wherein,

[0043] 1) In the process of billet casting, controlled rolling and controlled cooling are carried out after being heated by the heating furnace: 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, and the final rolling temperature is 830°C;

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

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Abstract

The invention discloses steel for a tempering-free gear free of carbide bainite and a production method of the steel. The steel is prepared from, by weight percent, not larger than 0.10wt% of C, 0.70-0.80wt% 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, 0.1-0.3wt% of Ni, 0.02-0.03wt% of Ti and the balance Fe and inevitable impurities. According to the steel for the tempering-free gear free of the carbide bainite and the production method of the steel, the steel free of the carbide bainite is introduced, a high-silicon aluminum-containing brand new ingredient system and production process is adopted, the ingredient system and the metallographic structure of the gear steel are completely innovated, and a brand new solution is provided for the development of a new generation of gear steel; and the groundbreaking result that the gear steel is free of tempering and is nearly free of deformation 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 quenching and tempering-free gear steel without carbide bainite and a production method thereof. Background technique [0002] With the rapid rise of China's manufacturing industry, especially the vigorous development of the domestic automobile industry, my country has become the world's largest gear manufacturing country, and the continuous development of the gear industry has greatly driven the demand for gear steel. Gear steel is used in a wide range of applications. In addition to automobiles, trucks, passenger cars, agricultural vehicles, motorcycles and other vehicle manufacturing industries, it is also widely used in railways, ships, and construction machinery. It is the core component manufacturing material to ensure safety. [0003] Gears are precise mechanical parts, usually...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/14C21D8/00C21D1/84
CPCC21D1/84C21D8/005C21D2211/002C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/14
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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