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High-silicon non-oriented electrical steel and its production method

A technology of oriented electrical steel and production method, which is applied in the field of steel material preparation, can solve the problems of high difficulty in cold rolling, increase of hardness and brittleness, and decrease of toughness of non-oriented electrical steel, and achieve the elimination of poor surface quality, excellent toughness and Machinability, effect of eliminating equipment wear and tear

Active Publication Date: 2022-01-18
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Increasing the silicon content is one of the important existing means to reduce the iron loss of non-oriented electrical steel. However, high silicon content will lead to the increase of hardness and brittleness and the decrease of toughness of non-oriented electrical steel, which will lead to the difficulty of cold rolling production of non-oriented electrical steel. Big
Specifically, edge damage, edge cracks and broken strips are prone to occur in the cold rolling process, which affects production efficiency and yield
[0004] In addition, in order to improve the magnetic properties of non-oriented electrical steel, higher normalization temperature and annealing temperature are often used in production to obtain coarse grain structure, but: in the steel obtained by high temperature normalization, the coarse grain will increase the brittleness , leading to the difficulty of cold rolling production; and high temperature annealing is likely to cause problems such as furnace roll nodules and poor steel surface quality
[0005] In summary, how to effectively solve the problem of difficult cold rolling in the production process while ensuring the magnetic properties of non-oriented electrical steel is the research focus in the development of non-oriented electrical steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A non-oriented electrical steel is provided, which is prepared by the following method:

[0053] 1) Clean steel technology is used for molten steel smelting, and the resulting molten steel is continuously cast into a continuous casting slab; the chemical composition of the continuous casting slab includes: C: 0.0024%, Si: 2.31%, Mn: 0.5%, Al : 0.5%, Sn: 0.027%, P: 0.05%, S: 0.0019%, the rest is Fe and inevitable inclusions;

[0054] 2) Heat and keep the continuous casting slab obtained in the previous step 1. The heating temperature is 1128°C, and the holding time is 2.5h; after that, rough rolling, finish rolling and coiling are carried out in sequence to obtain a hot-rolled coil with a thickness of 2.3mm , wherein the exit temperature of the rolling mill used in the rough rolling stage is 948°C, the finish rolling temperature in the finish rolling stage is 855°C, and the coiling temperature in the coiling stage is 665°C;

[0055] 3) Normalize the hot-rolled coils obt...

Embodiment 2

[0061] A non-oriented electrical steel is provided, which is prepared by the following method:

[0062] 1) Clean steel technology is used for molten steel smelting, and the resulting molten steel is continuously cast into a continuous casting slab; the chemical composition of the continuous casting slab includes: C: 0.0017%, Si: 2.8%, Mn: 0.2%, Al : 0.9%, Sn: 0.03%, P: 0.03%, S: 0.0008%, the rest is Fe and inevitable inclusions;

[0063] 2) Heating the continuous casting slab obtained in the previous step 1 and keeping it warm, the heating temperature is 1105°C, and the holding time is 3 hours; after that, rough rolling, finish rolling and coiling are carried out in sequence to obtain a hot-rolled coil with a thickness of 2.3mm. The exit temperature of the rolling mill used in the rough rolling stage is 940°C, the final rolling temperature in the finish rolling stage is 830°C, and the coiling temperature in the coiling stage is 635°C;

[0064] 3) Normalize the hot-rolled coil...

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Abstract

The invention discloses a high-silicon non-oriented electrical steel and a production method thereof. The method includes: 1) molten steel smelting and continuous casting into billets; 2) heating and heat preservation, and then hot rolling to obtain hot rolled coils. The temperature is 650±20°C; 3) Normalization, the normalization temperature is ((732~742)+3000[Si])°C, and the normalization time is 4min~5min; 4) After normalization, cold rolling is carried out directly, and then continuous annealing and Coating, the annealing temperature is 940°C~990°C and the annealing time is 1.5min~3min; 5) The steel plate after coating treatment is processed and formed, and then stress relief annealing is performed, the annealing temperature is ((761~766)+3000[Si]) ℃. In this way, while ensuring the magnetic performance, the problem of difficult cold rolling is solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material preparation, and relates to a production method of high-silicon non-oriented electrical steel and the high-silicon non-oriented electrical steel prepared by the production method. Background technique [0002] With the enhancement of people's low-carbon, energy-saving, environmental protection awareness and the improvement of the national energy efficiency level, it is increasingly required that the motor can achieve high efficiency, small size and quietness, which puts forward higher requirements for the magnetic properties of the motor core material, that is, the need for Non-oriented electrical steel has lower iron loss and higher magnetic induction. [0003] Increasing the silicon content is one of the important existing means to reduce the iron loss of non-oriented electrical steel. However, high silicon content will lead to the increase of hardness and brittleness and the dec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C22C33/04C22C38/00C22C38/02C22C38/04C22C38/06
CPCC21D8/1222C21D8/1233C21D8/1244C22C33/04C22C38/02C22C38/04C22C38/06C22C38/008
Inventor 李慧岳重祥吴圣杰詹东方
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE