High magentic induction oriented electrical steel sheet and its manufacturing method

A technology of high magnetic induction orientation and electrical steel plate, applied in other manufacturing equipment/tools, manufacturing tools, metal rolling, etc., can solve the problems of many surface defects, reduced output, high manufacturing cost, etc., and achieve the purpose of suppressing the primary grain length Large, high-temperature annealing temperature reduction, the effect of ensuring the strength of the inhibitor

Inactive Publication Date: 2008-09-17
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The high-temperature heating process of casting slabs used in industrial production of oriented electrical steel can obtain stable high magnetic properties, but the disadvantage is that there are many oxide slags, the burning loss can reach 5%, and the yield is low; the bottom of the furnace must be cleaned frequently, and the output is reduced; fuel High cost; short furnace life; high manufacturing cost; many surface defects
[0007] The production of oriented electrical steel all tries to reduce the heating temperature of the slab: the main method for Nippon Steel and Sumitomo Metal to reduce the heating temperature of the slab is to use AlN as the main inhibitor and carry out nitriding treatment. There are many process links, complex technology and high difficulty; South Korea's Pohang Iron and Steel Company uses AlN as the main inhibitor, Cu 2 S and MnS are auxiliary inhibitors with complex composition, high heating temperature and high final annealing temperature

Method used

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  • High magentic induction oriented electrical steel sheet and its manufacturing method
  • High magentic induction oriented electrical steel sheet and its manufacturing method
  • High magentic induction oriented electrical steel sheet and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1 A kind of manufacturing method of high magnetic induction oriented electrical steel sheet

[0022] A new steel slab with a thickness of 210mm, its chemical composition is: C is 0.035wt%, Si is 3.12wt%, Als is 0.02wt%, Nb is 0.04wt%, N is 0.008wt%, P is 0.013wt%, the rest is Fe and unavoidable impurities, and the inhibitors are AlN and NbC.

[0023] Such as heating the slab to 1280°C and keeping it warm for 2 hours; then hot rolling, the reduction ratio of the last 3 passes of the hot rolling process is 10%, and the final rolling temperature is 850°C; after rolling, relax for 60 seconds, The hot-rolled coils with fine and uniform precipitates and structures are obtained, and the normalizing annealing of the hot-rolled coils is cancelled. Then perform rapid cooling and coiling, and the cooling rate of rapid cooling is 30° C. / second. Relaxation refers to maintaining a certain period of time under the condition that the temperature is basically constant.

[00...

Embodiment 2

[0029] Example 2 A high magnetic induction oriented electrical steel sheet and its manufacturing method

[0030] A new steel slab with a thickness of 210mm and its chemical composition is: C is 0.030wt%, Si is 3.16wt%, Als is 0.01wt%, Nb is 0.07wt%, N is 0.010wt%, P is 0.014wt%, the rest is Fe and unavoidable impurities; the inhibitors are AlN and NbN.

[0031] Heat the slab to 1250°C and keep it warm for 2 hours; then carry out hot rolling, the reduction rate of the last two passes of the hot rolling process is 25%, the final rolling temperature is 1050°C, and relax for 30 seconds after rolling to obtain For hot-rolled strips with fine and uniform precipitates and structures, the normalizing annealing of hot-rolled strips is cancelled. Then, rapid cooling is performed, and the cooling rate of the rapid cooling is 50° C. / second.

[0032] The first cold rolling to 0.75mm, followed by intermediate annealing, the intermediate annealing temperature is 1000°C, carried out in a ni...

example 3

[0037] Example 3 A high magnetic induction oriented electrical steel sheet and its manufacturing method

[0038] A new steel slab with a thickness of 210mm, its chemical composition is: C is 0.050wt%, Si is 3.18wt%, Als is 0.01wt%, Nb is 0.12wt%, N is 0.010wt%, P is 0.014wt%, the rest is Fe and unavoidable impurities, and the inhibitors are AlN, NbC and NbN.

[0039] The slab was heated to 1300° C. and kept for 2 hours; hot rolling was carried out again. The reduction ratio of the last pass of the hot rolling process was 28%, the final rolling temperature was 1000° C., and the rolling was relaxed for 40 seconds. Carry out rapid cooling again, the cooling rate of rapid cooling is 40 DEG C / second, obtains precipitate and structure all fine and uniform appropriate hot-rolled coil, cancels the normalization annealing of hot-rolled coil.

[0040] Carry out the first cold rolling to 0.83mm, and then carry out intermediate annealing. The intermediate annealing temperature is 1050°C,...

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Abstract

The invention is about a sheet-blank high magnetic induction technical-orientated electrical steel plate and manufacturing method. The process is: first to heat the sheet blank to 1200-1320DEG C for 2-5h, then to hot roll, cool quickly(10-200DEG C / s) and wind up, next to cold roll to the thickness of less than 0.30mm, then to anneal by carbonization and form roll after being covered with MgO layer, at last to anneal at high temperature. The chemical constitution is: C 0.030-0.050wt%, Si 2.9-3.3 wt%, Als 0.001-0.04wt%, Nb 0.01-0.12 wt%, N 0.004-0.012 wt%, P (less than 0.015 wt%), Fe (the residue). The inhibitor is AIN and the Nb(C, N). So the process is simple. The electrical steel plate has high magnetic induction (above 1.89T) and low loss of Fe.

Description

1. Technical field: [0001] The invention belongs to the technical field of oriented electrical steel plates. In particular, it relates to a thick slab process high magnetic induction oriented electrical steel plate and a manufacturing method thereof. 2. Background technology [0002] Electrical steel is one of the most important metal functional materials for the manufacture of motors, transformers and ballast cores, as well as various electrical components for energy saving. In 1934, Goss of the United States applied for a patent for the production method of grain-oriented electrical steel sheet. The main feature of this method is to use MnS as the inhibitor and use the secondary cold rolling method. In the production and development of grain-oriented electrical steel, the production of high magnetic induction grain-oriented electrical steel (Hi-B) is of epoch-making significance. Japan's Nippon Steel Corporation oriented electrical steel production patent is characterize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P23/04C22C38/12C21D11/00C21D9/70C21D1/26B21B37/00
CPCY02P10/20
Inventor 吴开明
Owner WUHAN UNIV OF SCI & TECH
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