Production method of oriented high-silicon-steel thin plates

A high-silicon steel and thin-plate technology is applied in the field of preparation of boron-oriented high-silicon steel thin plates, which can solve the problems of uniform Fe/Si composition on the surface of the substrate, unfavorable large-scale production and application, and limited thin strip size. Achieve the effects of shortening the preparation cycle, excellent soft magnetic properties, and wide practicability

Inactive Publication Date: 2011-04-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method described in the Chinese patent "A Preparation Method of High-Si Oriented Silicon Steel Sheet" (CN100999822A) is to first sputter deposit a layer of ferrosilicon alloy film on a common silicon steel sheet, and then deposit a layer of AlN, TiN or MgO and other coatings. After rolling and heat treatment, a layer of oriented Fe / Si film is formed on the final surface. The disadvantage is that the size of the strip is limited, and it is difficult to ensure uniform Fe / Si composition on the entire substrate surface, which is not conducive to large-scale production and application.

Method used

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  • Production method of oriented high-silicon-steel thin plates
  • Production method of oriented high-silicon-steel thin plates
  • Production method of oriented high-silicon-steel thin plates

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Experimental program
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Effect test

Embodiment 1

[0021] (1) Raw material preparation: the silicon content of the mother steel ingot is 5.0%, and the boron content is 800ppm;

[0022] (2) Directional solidification: the melt temperature is 1520°C, the solidification rate is 1.2mm / min, the temperature gradient is 90K / cm, and the cast slab thickness obtained by directional solidification is 20mm. The typical metallographic structure is as follows: figure 1 shown;

[0023] (3) The slab is heated, the hot rolling start temperature is 1100°C, the final rolling temperature is 500°C, and the final slab is rolled to 1.6mm, such as figure 2 shown;

[0024] (4) Heat treatment of hot-rolled sheet: heat preservation at 950°C for 2 hours, and rapid cooling in ice water;

[0025] (5) Warm rolling: the starting temperature of warm rolling is 500°C, the final rolling temperature is 200°C, after multi-pass rolling, the final thickness is 0.6mm;

[0026] (6) Heat treatment of warm-rolled plate: heat preservation at 700°C for 1.5 hours, and...

Embodiment 2

[0030] (1) Raw material preparation: the silicon content of the mother steel ingot is 6.5%, and the boron content is 1500ppm;

[0031] (2) Directional solidification: the melt temperature is 1540°C, the solidification rate is 10mm / min, the temperature gradient is 200K / cm, and the slab thickness obtained by directional solidification is 8mm;

[0032] (3) Hot rolling, the slab is heated to 1200°C and held for 1 hour, the hot rolling is carried out in the range of 700~1200°C, and the final slab thickness is 2.6mm;

[0033] (4) Heat treatment of hot-rolled sheet: heat preservation at 950°C for 2 hours, and rapid cooling in ice water;

[0034] (5) Warm rolling: the starting temperature of warm rolling is 700°C, the final rolling temperature is 300°C, after multi-pass rolling, the final thickness is 0.8mm;

[0035] (6) Heat treatment of warm-rolled sheet: heat preservation at 900°C for 3 hours, and rapid cooling in brine;

[0036] (7) Cold rolling: pickling the heat-treated warm-r...

Embodiment 3

[0039] (1) Raw material preparation: the silicon content of the mother steel ingot is 8.5%, and the boron content is 80ppm;

[0040] (2) Directional solidification: the melt temperature is 1580°C, the solidification rate is 15mm / min, the temperature gradient is 300K / cm, and the slab thickness obtained by directional solidification is 16mm;

[0041] (3) Hot rolling, the slab is heated to 1050°C and held for 1 hour, the hot rolling is carried out in the range of 700~1050°C, and the final slab thickness is 2.0mm;

[0042] (4) Heat treatment of hot-rolled sheet: heat preservation at 950°C for 2 hours, and rapid cooling in ice water;

[0043] (5) Warm rolling: the starting temperature of warm rolling is 550°C, the final rolling temperature is 150°C, after multi-pass rolling, the final thickness is 0.7mm;

[0044] (6) Heat treatment of warm-rolled sheet: heat preservation at 1050°C for 2 hours, and rapid cooling in brine;

[0045] (7) Cold rolling: pickling the heat-treated warm-r...

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Abstract

The invention relates to a production method of oriented high-silicon steel thin plates, which belongs to the technical field of metal material production. The process comprises the following steps of: 1. obtaining cylindrical crystals grown in (100) directions by adopting a directional solidification method, and wherein the solidification rate is controlled between 0.6 and 15 mm / min and the temperature gradient is controlled between 60 and 400K / cm; 2. heating plate blanks at the heating temperature between 800 DEG C and 1300 DEG C, and then hot rolling the plate blanks to obtain sheet steel of 1.0-4.0mm; 3. carrying out annealing heat treatment and acid washing on the hot rolled plate blanks, and warm rolling the hot rolled plate blanks to obtain 0.4-0.8mm; and 4. carrying out heat treatment on warm rolled plates, and carrying out multiple cold rolling and secondary recrystallization annealing to obtain the oriented high-silicon steel. The production method has the advantages that the directional solidification method is utilized for controlling organization and crystal grain orientation from the material production source, a cold rolling method is used for producing alloy oriented plate materials, and the soft magnetic performance of the high-silicon steel is greatly improved. Produced cold rolled thin plates have good plate shapes.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and relates to a method for preparing a boron-containing oriented high-silicon steel sheet. Background technique [0002] High-silicon steel generally refers to silicon steel with a silicon content higher than 3.5% (weight percentage, the same below). With the increase of silicon content, high silicon steel exhibits excellent soft magnetic properties, such as low magnetostriction coefficient, greatly reduced iron loss, high resistivity and magnetic permeability, etc., very suitable for manufacturing high-speed high-frequency motors, audio And video head materials, choke coils and magnetic shielding at high frequencies, etc. [0003] However, high-silicon steel is hard and brittle at room temperature, and its processing performance is very poor. It is difficult to process it into thin plates by conventional rolling methods, and it is very difficult to prepare oriented high-sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/04
Inventor 林均品房现石梁永锋叶丰陈国良
Owner UNIV OF SCI & TECH BEIJING
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