Production method for manufacturing cold-rolled oriented silicon steel with high magnetic strength by using generally oriented steel raw material

A technology of grain-oriented silicon steel and a production method, which is applied in the production field of manufacturing high-magnetic-inductance cold-rolled grain-oriented silicon steel with general grain-oriented steel raw materials, can solve the problems of difficult production, high energy consumption, and large billet burning loss in the cold rolling process, and achieves perfection. The effect of secondary recrystallization, high yield of silicon steel, and enhanced suppression ability

Inactive Publication Date: 2014-06-25
新万鑫(福建)精密薄板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] (4) Due to the high heating temperature of the slab, the heating furnace needs to be repaired frequently, and the utilization efficiency is low. At the same time, the billet is burned, the energy consumption is high, and the hot-rolled edge cracks are large, resulting in difficult production in the cold-rolling process, low yield rate, and high overall cost;
[0015] (5) High-temperature slab heating The production process of general cold-rolled grain-oriented silicon

Method used

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  • Production method for manufacturing cold-rolled oriented silicon steel with high magnetic strength by using generally oriented steel raw material
  • Production method for manufacturing cold-rolled oriented silicon steel with high magnetic strength by using generally oriented steel raw material

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Experimental program
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Effect test

Embodiment 1

[0083] 1. Use a 500 kg vacuum furnace to make steel according to the final composition of Table 1, and the hot rolling conditions are shown in Table 2:

[0084] Table 1. Steelmaking composition of experimental steel (wt%)

[0085] Element C Si mn P S als N sn Remark A 0.059 3.15 0.15 0.021 0.015 0.025 0.048 0.018 B 0.048 3.09 0.16 0.019 0.011 0.018 0.005 0.022

[0086] Table 2. Experimental steel hot rolling conditions (°C)

[0087] project heating temperature Finishing temperature coiling temperature Thickness (mm) Remark C 1190 900 510 2.20 D 1295 950 535 2.20 compared to

[0088] 2. The normalization conditions are: 1120°C×5s+900°C×60s+50°C / s cooling;

[0089] 3. The steel strip was cold-rolled to 0.30mm, decarburized and coated with MgO annealing separator, followed by high-temperature annealing and tensile leveling annealing (including coating insulation layer), and th...

Embodiment 2

[0097] Use the A component in the middle of the above table 1 and the C hot-rolled condition steel in the table 2 to carry out the nitriding experiment in the early stage of the high temperature annealing stage. Table 4 shows the influence of the holding time of the step and the dew point of the atmosphere on the magnetic properties.

[0098] Table 4. Relationship between atmosphere, time and dew point and magnetism

[0099]

[0100] For a long time, the general production method of oriented silicon steel has been to use high-temperature heating of slabs. The heating temperature of slabs is as high as about 1400°C, so that the favorable inclusions can be fully dissolved, and the dispersion distribution and reasonable size of the favorable inclusions can be obtained during the hot rolling process. During high-temperature annealing, the primary recrystallization grains are suppressed to obtain a relatively good secondary recrystallization structure, and only 30Q120-30Q140, 27...

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Abstract

The invention discloses a production method for manufacturing cold-rolled oriented silicon steel with high magnetic strength by using a generally oriented steel raw material. The method comprises the following steps: (1) smelting, carrying out vacuum treatment, refining and continuously casting into a billet; (2) carrying out hot rolling; (3) normalizing and pickling; (4) wherein the single cold rolling pressure ratio is greater than or equal to 82%; (5) decarburizing annealing temperature; (6) annealing at high temperature, setting low thermal insulation of two steps, and high thermal insulation of one step, wherein the nitriding amount of an N gas is greater than or equal to 16ppm; (7) stretching, leveling and annealing, namely, pickling, coating, annealing and leveling. Gauss texture and nucleation are formed by the big pressure rate by cold rolling one time or twice, inclusions with enough quantity are formed by nitriding at an earlier stage of high-temperature annealing, development, stabilization and perfection of gaussian grains are recrystallized for the second time by using the enhanced inhibiting effect. By adopting the process, the magnetic property and the orientation degree of the product are improved when the silicon steel is produced by using the generally oriented silicon steel material, so that the property of the oriented silicon steel is improved, and high grade of cold-rolled oriented silicon steel 27Q105 is produced.

Description

technical field [0001] The invention belongs to a production method for manufacturing high magnetic induction cold-rolled oriented silicon steel by using common oriented steel raw materials. Background technique [0002] 1. Traditionally, the production methods of cold-rolled grain-oriented silicon steel and the grades that can be produced are as follows: [0003] ⑴Converter (or electric furnace) steelmaking, vacuum treatment, component refining and alloying, continuous casting into slab, its basic chemical composition is: Si (2.5~5.0), C (0.01~0.10), Mn (0.02~ 0.10), S (0.01 ~ 0.05), Als (0.01 ~ 0.05), N (0.003 ~ 0.015), some composition systems also contain one or more of Mo, Sb, Cr, B, Bi and other elements, the rest It is iron and unavoidable impurity elements, and sometimes the product may also contain Cu; [0004] (2) Before hot rolling, heat the slab to a temperature of about 1400°C in a special heating furnace, and keep it warm for more than 30 minutes, so that the...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C33/04C21D8/12
Inventor 张维林王一德魏智强张爱春计甫祥聂若坤张宗恩赵伟伟许洁滨金钢南鲍军仙郑瑜滨李鹏党宁曾尚武罗朝林戴东火牟小林张淮潘建韩
Owner 新万鑫(福建)精密薄板有限公司
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