Preparation method of high-magnetic-strength thin-gauge non-oriented silicon steel

A technology of oriented silicon steel and thin gauge, applied in the field of high magnetic induction thin gauge non-oriented silicon steel and its preparation, to achieve the effect of improving magnetic induction, reducing inhibition effect, and strong process versatility

Inactive Publication Date: 2015-01-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For thin-gauge samples, in addition to the magnetic induction is mainly controlled by the texture, the hysteresis loss accounts for the main body of the iron loss, that is, the texture also greatly affects the iron loss by affecting the hysteresis loss.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The main components of silicon steel ingot are Si: 2.8%, C: 0.025%, Mn: 0.05%, P: 0.005%, S: 0.01%, N:

[0027] 0.005%, the volume percentage of columnar crystals in the ingot is 50%.

[0028] (1) Hot rolling: heat the ingot at 1200°C for 30 minutes and then hot-roll it to 1.8mm;

[0029] (2) Normalization: the above-mentioned silicon steel hot-rolled 2 The normalization treatment is carried out under the atmosphere, the normalization temperature is 1150°C, the normalization time is 2min, and air-cooled;

[0030] (3) Twice cold rolling and intermediate annealing: cold-roll the normalized silicon steel plate after pickling to 0.18mm, the two-stage cold rolling reduction ratios are 78% and 55% respectively, and perform intermediate annealing at 840°C for 6 minutes deal with;

[0031] (4) Decarburization annealing: cold-rolled 0.18mm silicon steel sheet at 860°C, 20%H 2 +80%N 2 Carry out decarburization treatment in a mixed atmosphere, the water bath temperature is 6...

Embodiment 2

[0034] The main components of silicon steel ingot are Si: 3%, C: 0.038%, Mn: 0.25%, P: 0.006%, S: 0.012%, N:

[0035] 0.0035%, the volume percentage of columnar crystals in the ingot is 75%.

[0036](1) Hot rolling: heat the ingot at 1250°C for 25 minutes and then hot-roll it to 1.5mm;

[0037] (2) Normalization: the above-mentioned silicon steel hot-rolled 2 The normalization treatment is carried out under the atmosphere, the normalization temperature is 1110°C, the normalization time is 3min, and air-cooled;

[0038] (3) Twice cold rolling and intermediate annealing: cold-roll the normalized silicon steel plate after pickling to 0.16mm, the two-stage cold rolling reduction ratios are 73% and 60% respectively, and perform intermediate annealing at 860°C for 3min deal with;

[0039] (4) Decarburization annealing: 0.16mm silicon steel cold-rolled sheet at 840 ° C, 25% H 2 +75%N 2 Carry out decarburization treatment under a mixed atmosphere, the water bath temperature is 6...

Embodiment 3

[0042] The main components of the silicon steel ingot are Si: 3.05%, C: 0.045%, Mn: 0.1%, P: 0.008%, S: 0.015%, N: 0.0044%, and the volume percentage of columnar crystals in the ingot is 100%.

[0043] (1) Hot rolling: hot-roll the ingot to 2mm after holding it at 1320°C for 30 minutes, and return it to the furnace at 1200°C for 10 minutes after 3 passes;

[0044] (2) Normalization: the above-mentioned silicon steel hot-rolled 2 The normalization treatment is carried out under the atmosphere, the normalization temperature is 1120°C, the normalization time is 5min, and the water is quenched;

[0045] (3) Twice cold rolling and intermediate annealing: cold-roll the normalized silicon steel plate after pickling to 0.2mm, the two-stage cold rolling reduction ratios are 75% and 60% respectively, and perform intermediate annealing at 850°C for 5min deal with;

[0046] (4) Decarburization annealing: cold-rolled 0.2mm silicon steel sheet at 850°C, 30%H 2 +70%N 2 Carry out decarbu...

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Abstract

The invention belongs to the field of metal material processing and relates to high-magnetic-strength thin-gauge non-oriented silicon steel and a preparation method thereof. The preparation method of the high-magnetic-strength thin-gauge non-oriented silicon steel comprises the following steps: selecting a silicon steel ingot casting as a raw material, wherein the silicone steel ingot casting contains the following components (in percent by mass): 2.8-3.2% of Si, 0.025-0.045% of C, 0.05-0.35% of Mn, less than or equal to 0.008% of P, less than ore equal to 0.005% of N, less then or equal to 0.02% of S and balance of Fe and inevitable impurities, and volume percent of columnar crystals in the ingot casting is 50-100%; heating the silicon steel ingot casting to 1200-1350 DEG C, carrying out hot rolling, normalizing at the temperature of 1110-1150 DEG C, rolling until thickness is 0.12-0.2mm by adopting a two-stage cold-rolling method including intermediate annealing, then carrying out decarburizing annealing, and finally carrying out final annealing for 10-20 minutes at the temperature of 900-950 DEG C. The preparation method of the high-magnetic-strength thin-gauge non-oriented silicon steel has the advantages that a processing technology easier to implement is adopted and a thin-gauge non-oriented silicon steel product with magnetic strength B50 more than 1.73T is obtained.

Description

technical field [0001] The invention belongs to the field of metal material processing, and relates to a high magnetic induction thin-gauge non-oriented silicon steel and a preparation method. Background technique [0002] With the rapid development of the national economy, energy conservation and emission reduction has become an issue worthy of more and more attention, and low-efficiency motors need to be replaced by high-efficiency motors. Non-oriented silicon steel is widely used in the production of motors, and its low magnetic induction will cause high copper loss during the use of the motor, and copper loss accounts for the main part of the loss. Therefore, the non-oriented silicon steel product with high magnetic induction is the core to realize the high efficiency of the motor. At the same time, with the application of frequency conversion technology, thin gauge non-oriented silicon steel is an important research and development direction. At present, the existing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C33/04C22C38/04
Inventor 张宁杨平毛卫民
Owner UNIV OF SCI & TECH BEIJING
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