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An ultra-thin oriented silicon steel plate based on twin-roll strip continuous casting and its manufacturing method

A twin-roll thin strip continuous casting and manufacturing method technology, which is applied in the field of electrical steel manufacturing, can solve the problems of large energy consumption, many product defects, and low yield, achieve low energy consumption, simplify the production process, and inhibit grain growth Effect

Active Publication Date: 2017-04-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the conventional oriented silicon steel strip production process, the method disclosed in the patent CN1562511A uses asynchronous cold rolling instead of synchronous cold rolling to improve the shape of the plate; Silicon steel thin strips are made of finished slabs of oriented silicon steel as raw materials, but the traditional production process of oriented silicon steel has many defects, low yield, high energy consumption, and serious environmental pollution.

Method used

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  • An ultra-thin oriented silicon steel plate based on twin-roll strip continuous casting and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The molten steel composition of ultra-thin grain-oriented silicon steel sheet is C 0.06%, Si 3.1%, Mn 0.20%, S0.025%, Als 0.02%, N 0.009%, Ti 0.07%, O8 1.80T, iron loss P 10 / 400 6.7W / kg, iron loss P 10 / 100022.5W / kg, thickness 0.1mm;

[0040] The manufacturing method includes the following steps:

[0041] Smelt molten steel according to the set composition, the composition is the same as above;

[0042] A twin-roll strip continuous casting device is used to pour molten steel through the tundish into a cavity composed of two crystallization rollers and two side sealing plates to form a molten pool. The upper surface superheat of the molten pool is controlled at 40°C, and the molten steel in the molten pool Solidified with the rotation of the crystal roll and exported at a speed of 40m / min to obtain a cast belt;

[0043] The cast strip is cooled by the cooling unit at a speed of 20-100°C / s and then hot-rolled. The rolling start temperature is 1000°C, the hot-rolling red...

Embodiment 2

[0053] The molten steel composition of ultra-thin grain-oriented silicon steel sheet is C 0.002%, Si 2.8%, Mn 0.05%, S0.015%, Als 0.005%, N 0.003%, Ti 0.5%, Cu 0.3%, Sn 0.1%, O 8 1.73T, iron loss P 10 / 400 8.0W / kg, iron loss P 10 / 1000 19.1W / kg, thickness 0.05mm;

[0054] Manufacturing method is the same as embodiment 1, and difference is:

[0055] (1) The composition of molten steel is the same as above;

[0056] (2) The superheat degree on the upper surface of the molten pool is 10°C, and the molten steel in the molten pool is exported at a speed of 60m / min;

[0057] (3) The cast strip is cooled at a rate of 20 °C / s, the hot rolling start temperature is 900 °C, the reduction rate is 15%, and the hot rolling is cooled at a rate of 20 °C / s;

[0058] (4) The temperature of normalizing annealing is 850℃, and the time is 10min;

[0059] (5) The first cold rolling reduction rate is 70%; the first intermediate annealing temperature is 800 ° C, and the time is 10 minutes;

[006...

Embodiment 3

[0066] The molten steel composition of ultra-thin grain-oriented silicon steel sheet is C 0.08%, Si 3.4%, Mn 0.30%, S0.04%, Als 0.05%, N 0.01%, Ti 0.01%, Cu 0.6%, Sn 0.2%, O 8 1.84T, iron loss P 10 / 400 6.7W / kg, iron loss P 10 / 1000 26.8W / kg, thickness 0.15mm;

[0067] Manufacturing method is the same as embodiment 1, and difference is:

[0068] (1) The composition of molten steel is the same as above;

[0069] (2) The superheat degree on the upper surface of the molten pool is 70°C, and the molten steel in the molten pool is exported at a speed of 20m / min;

[0070] (3) The cast strip is cooled at a rate of 100 °C / s, the hot rolling start temperature is 1150 °C, the reduction rate is 50%, and the hot rolling is cooled at a rate of 100 °C / s;

[0071] (4) The temperature of normalizing annealing is 1150℃, and the time is 1min;

[0072] (5) The first cold rolling reduction rate is 40%; the first intermediate annealing temperature is 1000 ° C, and the time is 3 minutes;

[007...

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Abstract

An ultra-thin oriented silicon steel plate based on twin-roller thin strip continuous casting and its manufacturing method. The steel plate composition according to mass percentage is C 0.002~0.08%, Si 2.8~3.4%, Mn 0.05~0.30%, S 0.015~0.04%, Als 0.005~0.05%, N 0.003~0.010%, Ti 0.01~0.5%, Cu 0~0.6%, Sn 0~0.2%, O<0.004%, P<0.01%, the balance is Fe; the product thickness is 0.05 ~0.15mm; methods include: (1) smelting molten steel; (2) continuous casting to obtain cast strips; (3) hot rolling and then coiling after cooling; (4) controlled cooling after normalized annealing; (5) after pickling One cold rolling, then, one intermediate annealing; (6) Two cold rolling after pickling, then two intermediate annealing; (7) Three cold rolling after pickling; (8) Decarburization annealing; (9) Coating annealing Isolating agent; (10) Purification annealing after high temperature annealing. The method of the invention is simple and effective, and has the characteristics of short process, easy control and low energy consumption.

Description

technical field [0001] The invention belongs to the field of electrical steel manufacturing, and in particular relates to an ultra-thin oriented silicon steel plate based on twin-roll strip continuous casting and a manufacturing method thereof. Background technique [0002] Grain-oriented silicon steel is an important soft magnetic material, mainly used in the production of transformer cores, and is one of the indispensable materials for the development of the power industry. The magnetic performance indicators of oriented silicon steel mainly include magnetic induction intensity (B) and iron loss (Pr). The iron loss is directly related to the iron core loss of transformers and other power transmission and transformation products when they are in service. The history of continuous decline; at present, people are committed to obtaining oriented silicon steel with lower iron loss to meet the demand for magnetic materials in the rapidly developing electronics industry, which ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C21D8/12B22D11/06
Inventor 刘海涛宋红宇王银平张宝光安灵子赵士淇刘文强曹光明李成刚刘振宇王国栋
Owner NORTHEASTERN UNIV LIAONING