Low-anisotropy non-oriented silicon steel for hydroelectric power generation and production method thereof

A technology of anisotropy and production method, which is applied in the field of low anisotropy non-oriented silicon steel for hydroelectric power generation and its production, and achieves the effect of simple production process

Active Publication Date: 2020-07-24
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The non-oriented silicon steel commonly used in hydroelectric power generation equipment has a thickness of 0.5mm, and for the preparation of non-oriented silicon steel o

Method used

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  • Low-anisotropy non-oriented silicon steel for hydroelectric power generation and production method thereof
  • Low-anisotropy non-oriented silicon steel for hydroelectric power generation and production method thereof
  • Low-anisotropy non-oriented silicon steel for hydroelectric power generation and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for producing low-anisotropy non-oriented silicon steel with a thickness of 0.50 mm for hydroelectric power generation, comprising the following steps:

[0031] Molten steel is smelted according to the production process of molten iron pretreatment, converter smelting, and RH refining. After RH refining, the chemical composition of molten steel at the end point is Si: 3.2%, Mn: 0.30%, Als: 1.0%, B=0.0025%, Cu =0.02%, [S+C+N+Ti]=72ppm, the rest is Fe and unavoidable impurities.

[0032] Electromagnetic stirring is used for continuous casting to obtain a billet with a size of 230mm×10m, and the proportion of equiaxed crystals in the cross-section of the billet is 70%;

[0033] The billet was heated at 1110°C, the soaking time was 70min, the finish rolling was rolled 2.0mm in 7 passes, and the final rolling temperature was set at 900°C;

[0034] The steel strip is carried out at a normalization temperature of 900 ° C, and then the normalized steel strip is rolled...

Embodiment 2

[0040] Others are the same as embodiment 1, the difference is:

[0041] The finishing temperature was set at 840°C, and the normalizing temperature was set at 840°C.

[0042] The non-oriented silicon steel products prepared by the above-mentioned composition and process are tested according to the methods in GB / T 2521.1-2016 and GB / T13789, and the iron loss is P 1.5 / 50 =2.35W / Kg, magnetic induction B 50 = 1.67T, non-oriented silicon steel products with iron loss anisotropy of 8.7%, meeting the design requirements of hydroelectric power generation equipment.

Embodiment 3

[0044] Others are the same as embodiment 1, the difference is:

[0045] (1) The mass percentage of chemical composition is Si: 3.0%, Mn: 0.11%, Als: 0.75%, B: 0.0013%, Cu=0.015%, [S+C+N+Ti]=64ppm, the rest is Fe and not available Impurities to avoid;

[0046] (2) The proportion of equiaxed crystals in the slab is 63%;

[0047](3) The temperature rise rate of the annealing furnace is 13°C / s, the holding time of the annealing process temperature section is 80s, and the tension in the furnace is 0.9N / mm 2 .

[0048] The non-oriented silicon steel products prepared by the above-mentioned composition and process are tested according to the methods in GB / T 2521.1-2016 and GB / T13789, and the iron loss is P 1.5 / 50 =2.31W / Kg, magnetic induction B 50 = 1.66T, non-oriented silicon steel products with iron loss anisotropy of 8.1%, meeting the design requirements of hydroelectric power generation equipment.

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Abstract

The invention discloses low-anisotropy non-oriented silicon steel for hydroelectric power generation and a production method thereof. The low-anisotropy non-oriented silicon steel comprises the following chemical compositions: by weight percentage, 2.8-3.2% of Si, 0.1-0.3% of Mn, 0.5-0.8% of Als, 0.0010% - 0.0025% of B, 0.01% - 0.02% of Cu, no less than 80 ppm of [ S + C + N + Ti ] and the balanceFe and inevitable impurities, and a non-oriented silicon steel product with the thickness of 0.50mm is prepared by the steps of molten iron pretreatment, converter smelting, RH refining, continuous casting, hot rolling, normalized pickling, cold rolling, continuous annealing, coating and finishing, under the condition that the test density is 7.6 g/dm3, the magnetic induction B50 is greater thanor equal to 1.65T, the iron loss P1.5/50 is less than or equal to 2.40 W/kg, the iron loss anisotropy is less than 10%, and the design requirement of hydroelectric power generation equipment can be met at a high level.

Description

technical field [0001] The invention belongs to the field of non-oriented silicon steel manufacturing, and in particular relates to a low-anisotropy non-oriented silicon steel for hydroelectric power generation and a production method thereof. Background technique [0002] In recent years, with the continuous development of the national power industry and the continuous improvement of environmental protection requirements, the total installed capacity of hydropower equipment has continued to increase. The generator rotor works in the running state. With the increase of motor capacity, the local overheating and vibration problems of large synchronous generators have been widely concerned. The non-oriented silicon steel used as the core material of the generator inevitably has magnetic anisotropy, especially for hydroelectric power generation equipment, which mainly uses the transverse performance of the silicon steel plate, so the magnetic anisotropy is particularly concerned...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C38/14C22C38/06C22C38/04C22C38/02C22C33/04C21D1/26C21D8/12C21D9/56C23C22/74
CPCC22C38/16C22C38/14C22C38/06C22C38/04C22C38/02C22C38/004C22C38/001C22C33/04C21D1/26C21D8/1222C21D8/1233C21D8/1244C21D9/564C21D9/561C23C22/74
Inventor 杜军裴英豪施立发夏雪兰胡柯李轶伦
Owner MAANSHAN IRON & STEEL CO LTD
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