Non-quenched and tempered steel for motor shaft of new energy electric vehicle and production method of non-quenched and tempered steel

A non-quenched and tempered steel and production method technology, applied in the direction of manufacturing converters, etc., can solve the problems of long production cycle and high production cost, and achieve the effects of improving machinability, increasing yield ratio, and increasing Si element content

Active Publication Date: 2019-03-08
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the production cost of steel for motor shafts currently on the market is relatively high, and the production cycle is relatively long.

Method used

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  • Non-quenched and tempered steel for motor shaft of new energy electric vehicle and production method of non-quenched and tempered steel
  • Non-quenched and tempered steel for motor shaft of new energy electric vehicle and production method of non-quenched and tempered steel
  • Non-quenched and tempered steel for motor shaft of new energy electric vehicle and production method of non-quenched and tempered steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] For the refining of high-purity steel, the range of Mn is controlled at 0.99~1.02% during LF smelting; after RH is broken, the hydrogen is determined: [H]≤2.0ppm, and then the temperature is taken by sampling, and the N-Mn line is carried out according to the analysis results of the oxygen nitrogen meter. Supplementary feeding of Al wire is not allowed during the smelting process; after the LF smelting is completed, the content of the added silicon-calcium wire is determined according to the Al content in the spectral composition; during the RH vacuum process, the Al wire 2 o 3 Fully carry out denaturation treatment; immediately feed titanium wire, manganese nitride cored wire, and sulfur wire to adjust the content of Ti, N, and S after breaking the air; softly blow argon for 20 minutes and hang the bag after the composition is uniform; before rolling, the first The lower heating temperature of the furnace temperature in the heating section is 750°C, and the upper heati...

Embodiment 2

[0036] The production process is basically the same as in Example 1: for the refining of high-purity steel, the range of Mn is controlled at 0.99~1.02% during LF smelting; hydrogen is determined after RH is broken: [H]≤2.0ppm, and then the temperature is measured by sampling. The supplementary feeding of N-Mn wire is carried out according to the analysis results of the oxygen and nitrogen meter, and the Al wire is not allowed to be fed during the smelting process; after the LF smelting is completed, the content of the added silicon-calcium wire is determined according to the Al content in the spectral composition; al 2 o 3 Fully carry out denaturation treatment; immediately feed titanium wire, manganese nitride cored wire, and sulfur wire to adjust the content of Ti, N, and S after breaking the air; softly blow argon for 25 minutes and hang the bag after the composition is uniform; before rolling, the first The lower heating temperature of the furnace temperature in the heati...

Embodiment 3

[0039] The production process is basically the same as in Example 1: for the refining of high-purity steel, the range of Mn is controlled at 0.99~1.02% during LF smelting; hydrogen is determined after RH is broken: [H]≤2.0ppm, and then the temperature is measured by sampling. The supplementary feeding of N-Mn wire is carried out according to the analysis results of the oxygen and nitrogen meter, and the Al wire is not allowed to be fed during the smelting process; after the LF smelting is completed, the content of the added silicon-calcium wire is determined according to the Al content in the spectral composition; al 2 o 3 Fully carry out denaturation treatment; immediately feed titanium wire, manganese nitride cored wire, and sulfur wire to adjust the content of Ti, N, and S after breaking the air; softly blow argon for 20 minutes and hang the bag after the composition is uniform; before rolling, the first The lower heating temperature of the furnace temperature in the heati...

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Abstract

The invention discloses non-quenched and tempered steel for a motor shaft of a new energy electric vehicle and a production method of the non-quenched and tempered steel. The steel is prepared from the following chemical compositions in percentage by weight: 0.45-0.51% of C, 0.30-0.55% of Si, 1.0-1.25% of Mn, no more than 0.020% of P, 0.010-0.025% of S, 0.10-0.20% of Cr, 0.20-0.30% of Ni, 0.015-0.035% of Al, 0.08-0.12% of V, no more than 0.035% of Nb, 0.010-0.025% of Ti, 130-170 ppm of N, and the balance of original Fe. According to the non-quenched and tempered steel for the motor shaft of the new energy electric vehicle and the production method of the non-quenched and tempered steel, it can be known that through perfect combination of optimization design of the chemical compositions anda controlled rolling and cooling process technology (rolling parameters), the smelting process, the initial rolling temperature, the finish rolling temperature and the cooling mode of a formula are strictly controlled, thus production of the easy-turning and high-toughness non-quenched and tempered steel for the motor shaft is achieved, the developed motor shaft can be highly reinforced, the manufacturing cost can further be lowered (20% of the procedure cost is saved), and the production period can be shortened (the production time is shortened by one day).

Description

technical field [0001] The invention relates to the field of production of non-quenched and tempered steel for easy turning and forging, in particular to a non-quenched and tempered steel for a motor shaft of a new energy electric vehicle and a production method thereof. Background technique [0002] In the past 10 years, with the country's strict requirements on technical indicators such as energy consumption and emission reduction, light weight, economy, and power performance of traditional vehicles, as well as increasing financial efforts to support and subsidize the new energy vehicle industry, the development of new hybrid vehicles and pure electric vehicles Energy electric vehicles have become a national development strategy. By 2020, the production capacity of pure electric vehicles and plug-in hybrid vehicles will reach 2 million, and the cumulative production and sales will exceed 5 million. With the support of national and local government supporting policies (pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/34C21C7/00C21C7/06C21C7/064C21C7/10C22C33/04C22C38/02C22C38/04C22C38/06C22C38/46C22C38/48C22C38/50
CPCC21C5/34C21C7/0006C21C7/0025C21C7/06C21C7/064C21C7/10C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/46C22C38/48C22C38/50
Inventor 吉光郑力宁肖波印传磊谭利
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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