A kind of low anisotropy non-oriented silicon steel for hydroelectric power generation and its production method

An anisotropic, oriented silicon steel technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., to achieve the effect of simple production process

Active Publication Date: 2022-03-25
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 of this thickness, there is no effective method in the prior art to maintain excellent magnetic properties and low iron loss. , to better control its iron loss anisotropy

Method used

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  • A kind of low anisotropy non-oriented silicon steel for hydroelectric power generation and its production method
  • A kind of low anisotropy non-oriented silicon steel for hydroelectric power generation and its production method
  • A kind of low anisotropy non-oriented silicon steel for hydroelectric power generation and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0032] Continuous casting adopts electromagnetic stirring to obtain 230mm×10m billet, of which the equiaxed crystal ratio of the section structure of the billet is 70%;

[0033] The billet was heated at 1110°C, the soaking time was 70min, the finishing rolling was 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 in Example 1, except that:

[0041] The finish rolling temperature was set to 840°C, and the normalization temperature was set to 840°C.

[0042] The non-oriented silicon steel products prepared by the above-mentioned components and processes are tested in accordance with the methods in GB / T 2521.1-2016 and GB / T13789. The obtained magnetic properties, iron loss 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 hydropower equipment.

Embodiment 3

[0044] Others are the same as in Example 1, except that:

[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 are Fe and cannot be impurities to be avoided;

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

[0047](3) The heating rate of the annealing furnace is 13℃ / s, the holding time of the temperature section of the annealing process 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 components and processes are tested in accordance with the methods in GB / T 2521.1-2016 and GB / T13789. The obtained magnetic properties, iron loss 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 hydropower equipment.

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Abstract

A low-anisotropy non-oriented silicon steel for hydroelectric power generation and its production method, comprising the following chemical components in weight percent: Si: 2.8-3.2%, Mn: 0.1-0.3%, Als: 0.5-0.8%, B: 0.0010% ~0.0025%, Cu: 0.01%~0.02%, [S+C+N+Ti]≤80ppm, the rest is Fe and unavoidable impurities, after molten iron pretreatment, converter smelting, RH refining, continuous casting, hot rolling, Prepared by normalized pickling, cold rolling, continuous annealing, coating, and finishing steps, the 0.50mm thick non-oriented silicon steel product is prepared, and its test density is 7.6g / dm 3 condition, magnetic induction B 50 ≥1.65T, iron loss P 1.5 / 50 ≤2.40W / kg, iron loss anisotropy <10%, which can meet the design requirements of hydropower equipment 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 hydropower 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 the motor capacity, the local overheating and vibration problems of large synchronous generators have received extensive attention. Non-oriented silicon steel as a generator core material inevitably has magnetic anisotropy. Especially for hydropower equipment, the lateral properties of silicon steel plates are mainly used, so magnetic anisotropy is particularly concerned, and iron loss is generally required. The magne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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