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High magnetic induction and high grad non-orientation electrical steel and its making process

A technology of oriented electrical steel and manufacturing method, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of continuous casting slab collapse, increase in the number of inclusions, and affect the quality of final products, so as to reduce the precipitation of AlN and reduce the The effect of solid solution

Inactive Publication Date: 2007-01-03
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the low-temperature casting method is adopted, the temperature of the molten steel in the continuous casting process is not easy to control, and the inclusions in the crystallizer are not easy to float up, and the number of inclusions in the continuous casting slab increases, which affects the quality of the final product; Bulletin No. 1) requires the heating temperature of the continuous casting slab to be raised to above 1250°C, which will easily cause the continuous casting slab to collapse, affect the production rhythm, and increase the production cost

Method used

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  • High magnetic induction and high grad non-orientation electrical steel and its making process
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Embodiment 1

[0061] Invention steel A contains C: 0.0031%, Si: 2.00%, Al: 0.95%, Mn: 0.31%, Sn: 0.092%, B: 0.0009%, and the rest is iron and unavoidable impurities; the cumulative reduction ratio of rough rolling is 84% %, the reduction rate of one pass is 41%, the rough rolling finish rolling temperature is 1000°C; the finish rolling start rolling temperature is 918°C, the finish rolling temperature is 868°C, the coiling is 560°C, and the finish rolling reduction rates are respectively: 31% for the first pass, 29% for the second pass, 29% for the third pass, 71% for the fourth pass, and 18% for the fifth pass; normalization annealing is not used; the cold rolling reduction rate is 87% ( Finished steel strip thickness is 0.35mm); recrystallization annealing system: 1000°C×90 seconds, heating rate is 30°C / s, slow cooling rate is controlled at ≤15°C / s (1000°C→600°C), fast cooling rate is controlled It is 33°C / s. The annealing atmosphere adopts 30% H2+70% N2. The surface quality of the fini...

Embodiment 2

[0063] Invention steel B contains C: 0.0029%, Si: 2.00%, Al: 0.99%, Mn: 0.301%, Sb: 0.078%, B: 0.0009%, and the rest is iron and unavoidable impurities; the cumulative reduction ratio of rough rolling is 85% %, the reduction rate of one pass is 42%, the rough rolling finish rolling temperature is 990°C; the finish rolling start rolling temperature is 916°C, the finish rolling temperature is 868°C, the coiling is 729°C, and the finish rolling reduction rates are respectively: 31% for the first pass, 29% for the second pass, 30% for the third pass, 71% for the fourth pass, and 17% for the fifth pass; normalization is not used; the cold rolling reduction rate is 87.5% (finished product Strip thickness is 0.35mm); recrystallization annealing system: 1000°C×70 seconds, heating rate is 28°C / s, slow cooling rate is controlled at ≤15°C / s (1000°C→600°C), fast cooling rate is controlled at 31°C / s. The annealing atmosphere adopts 30% H2+70% N2. The surface quality of the finished board...

Embodiment 3

[0065] Invention steel C contains C: 0.0030%, Si: 2.01%, Al: 1.02%, Mn: 0.302%, Sn: 0.1%, B: 0.001%, and the rest is iron and unavoidable impurities; the cumulative reduction rate of rough rolling is 83% %, the reduction rate of one pass is 42%, the rough rolling finish temperature is 1000°C; the finish rolling start temperature is 915°C, the finish rolling temperature is 872°C, the coiling is 725°C, and the finish rolling reduction rates are: 30% for the first pass, 30% for the second pass, 30% for the third pass, 70% for the fourth pass, 17% for the fifth pass; normalization system: 1000℃×120 seconds; cold rolling reduction rate 86.5% (the thickness of finished steel strip is 0.35mm); recrystallization annealing system: 1000°C×80 seconds, heating rate is 28°C / s, slow cooling rate is controlled at ≤15°C / s (1000°C→600°C), The rapid cooling rate is controlled at 30°C / s. The annealing atmosphere adopts 30% H2+70% N2. The surface quality of the finished board is good, the avera...

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Abstract

The present invention is high magnetic induction and high grade non-orientation electrical steel and its making process. The high magnetic induction and high grade non-orientation electrical steel consists of C not more than 0.0050 wt%, N not more than 0.0030 wt%, Si 1.50-2.50 wt%, Al 0.80-1.30 wt%, Mn 0.20-0.50 wt%, P not more than 0.030 wt%, S not more than 0.005 wt%, Sb 0.03-0.10 wt% or Sn 0.05- 0.12 wt%, and B 0.0005-0.0040 wt%, except Fe and inevitable impurities. Its making process includes initial rolling and high temperature winding to obtain ideal hot rolled steel belt structure; cold rolling to provide the energy for crystal grain growth in re-crystallizing annealing, and re-crystallizing annealing in controlled temperature to obtain ideal crystal grain structure. It has excellent surface quality, high magnetic induction and low iron loss, and is suitable for use in high efficiency motor iron core.

Description

technical field [0001] The invention relates to a non-oriented electrical steel and a manufacturing method thereof, in particular to a manufacturing process of a high-grade non-oriented electrical steel with high magnetic induction mainly used for producing high-efficiency motor iron cores. Background technique [0002] Conventional non-oriented electrical steel production methods use silicon (Si) to increase the electrical resistivity of steel materials, and achieve the purpose of reducing iron loss by adding silicon, but at the same time, due to the increase in electrical resistivity, the magnetic permeability decreases. Eventually lead to a reduction in magnetic induction. Therefore, although high-grade non-oriented electrical steel (high Si content) manufactured by conventional production methods can obtain lower iron loss to a certain extent, it also has the disadvantage of low magnetic induction. In the current motor industry, which focuses on saving energy and improv...

Claims

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Application Information

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IPC IPC(8): C22C38/06C21D8/12C21D9/54
Inventor 黄望芽周世春刘自成刘永勤
Owner BAOSHAN IRON & STEEL CO LTD
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