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Ultra-low carbon oriented silicon steel and preparation method thereof

An oriented silicon steel, ultra-low carbon technology, applied in the field of metallurgy, can solve the problems of complex process, high cost, unsatisfactory performance, etc., to achieve uniform distribution, good performance, and improve the degree of orientation.

Active Publication Date: 2015-01-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition system mentioned above in the patent of cast-rolling oriented silicon steel obviously also inherits the composition system of the conventional process; however, the current methods all have the disadvantages of complicated process, high cost, and unsatisfactory performance

Method used

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  • Ultra-low carbon oriented silicon steel and preparation method thereof
  • Ultra-low carbon oriented silicon steel and preparation method thereof
  • Ultra-low carbon oriented silicon steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The molten steel is smelted according to the set composition, and then enters the preheated tundish through the gate. At this time, the preheating temperature of the tundish is 1200~1250°C. The molten steel enters the thin strip continuous casting machine through the tundish, and is cast and rolled into a 2.05mm thick Cast strip; during the casting and rolling process, the superheat of molten steel is controlled at 20°C; the metallographic microstructure of the cast strip is as follows: figure 2 shown;

[0034] The cast strip is hot-rolled, the starting rolling temperature is 980°C, the final rolling temperature is 880°C, and the total reduction is 15%, to obtain a hot-rolled strip;

[0035] The hot-rolled strip is laminarly cooled, then pickled to remove the iron scale, and then two-stage cold rolling; the first-stage cold rolling reduction rate is 60%, and the intermediate annealing is performed after the first-stage cold rolling. The annealing temperature is 850 ° C...

Embodiment 2

[0038] The molten steel is smelted according to the set composition, and then enters the preheated tundish through the gate. At this time, the preheating temperature of the tundish is 1200~1250°C. The molten steel enters the thin strip continuous casting machine through the tundish, and is cast and rolled into a 2.31mm thick Cast strip; during the casting and rolling process, the superheat of the molten steel is controlled to be 30°C;

[0039] The cast strip is hot-rolled, the starting rolling temperature is 1030°C, the final rolling temperature is 950°C, the total reduction is 10%, and the hot-rolled strip is obtained; the hot-rolled strip is laminarly cooled, then pickled to remove the iron scale, and then Carry out two-stage cold rolling; the reduction rate of the first-stage cold rolling is 70%, and the intermediate annealing is carried out after the first-stage cold rolling. , made into a cold-rolled strip with a thickness of 0.27mm;

[0040] Under the condition of nitro...

Embodiment 3

[0043] The molten steel is smelted according to the set composition, and then enters the preheated tundish through the gate. At this time, the preheating temperature of the tundish is 1200~1250°C. The molten steel enters the thin strip continuous casting machine through the tundish, and is cast and rolled into a 2.41mm thick Cast strip; during the casting and rolling process, the superheat of molten steel is controlled to 40°C;

[0044] The cast strip is hot-rolled, the starting rolling temperature is 1000°C, the final rolling temperature is 900°C, and the total reduction is 11%, to obtain a hot-rolled strip;

[0045] The hot-rolled strip is laminarly cooled, then pickled to remove the scale, and then two-stage cold rolling; the first-stage cold rolling reduction rate is 65%, and the first-stage cold rolling is followed by intermediate annealing. The annealing temperature is 950 ° C, and the annealing time is 4min; then carry out two-stage cold rolling, the reduction rate is 8...

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Abstract

The invention discloses ultra-low carbon oriented silicon steel and a preparation method thereof. The ultra-low carbon oriented silicon steel comprises the following components in percentage by mass: 0.002%-0.005% of C, 2.8%-4.0% of Si, 0.07%-0.3% of Mn, 0.02%-0.1% of Al, no more than 0.5% of Cu, 0.01%-0.03% of S, 0.004%-0.02% of N, no more than 0.005% of O, and the balance of Fe and inevitable impurities, wherein the magnetic property P17 / 50 is 0.8-1.1W / kg, and the magnetic induction B8 is 1.85-1.94T. The preparation method comprises the following steps: (1) smelting molten steel, introducing the molten steel into a tundish and carrying out roll-casting to form a casting strip; (2) carrying out hot rolling; (3) carrying out laminar cooling, pickling, and carrying out two-stage cold rolling; and (4) heating to 1200+ / -10 DEG C under the protective condition of nitrogen, then carrying out heat preservation under the condition of pure dry nitrogen, carrying out high-temperature annealing, and cooling to 400+ / -10 DEG C along with the furnace, and carrying out air cooling. According to the method disclosed by the invention, the content of C is controlled to be lower than 50ppm; the entire process is controlled to be single-phase ferrite matrix; the molding property of the casting strip is improved; fine and uniform primary recrystallization tissues are obtained; and the product has good property.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an ultra-low carbon oriented silicon steel and a preparation method thereof. Background technique [0002] Oriented silicon steel has excellent magnetic properties of high magnetic induction and low iron loss along the rolling direction. It is mainly used in the iron core of various transformers and is an indispensable and important soft magnetic alloy in power electronics and military industry. The traditional oriented silicon steel preparation process is complex and lengthy, mainly including: smelting - continuous casting - high temperature heating of slab - hot rolling - normalization - cold rolling - decarburization annealing - high temperature annealing, etc., in order to ensure perfect secondary recrystallization of oriented electrical steel sheet, High-temperature heating of slab, comprehensive control of hot rolling process and normalization process have be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/06C21D8/12
CPCC21D8/12C22C38/06C22C38/16C22C38/004C21D8/1222C21D8/1244C22C38/001C22C38/02C22C38/04
Inventor 王国栋许云波王洋张元祥方烽卢翔曹光明李成刚刘振宇
Owner NORTHEASTERN UNIV
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