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High-silicon steel sheet and cryogenic pack rolling technology for preparing same

A high-silicon steel and sheet technology, applied in the field of steel rolling, can solve the problems of difficult cold rolling deformation, large deformation resistance, coarse grain size, etc. Effect

Active Publication Date: 2019-10-29
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of ultra-thin high-silicon steel is currently facing two challenges. The first is that the coarse grain size, excessive Fe-Si covalent bonds, high Pina force and high-silicon solid-solution strengthening make high-silicon steel both stable at room temperature. Hard and brittle, high deformation resistance, extremely poor plasticity, difficult to deform in cold rolling
The second is that when the thickness of the high-silicon steel sheet is below a certain thickness, due to the size effect of the sheet, thickness softening behavior will occur, coupled with the limitation of the roll gap and the diameter of the work roll, it is difficult to continue to reduce the thickness of the finished high-silicon steel sheet
In summary, these two problems currently cannot produce thinner high-silicon steel sheets that people expect to produce through the cold rolling process

Method used

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  • High-silicon steel sheet and cryogenic pack rolling technology for preparing same
  • High-silicon steel sheet and cryogenic pack rolling technology for preparing same
  • High-silicon steel sheet and cryogenic pack rolling technology for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Vacuum induction furnace is used to cast high-silicon steel ingots, and its chemical composition by weight percentage is: Si 6.91%, Al 0.4%, Y 0.008%, Zr 0.05%, C 0.007%, Mn 0.008%, P 0.005%, S 0.004% , N0.002%, O 0.002%, the balance Fe.

[0030] At a temperature of 1200°C, after holding for 140 minutes, the billet is free forged into a 40mm thick billet by air. The heating temperature of the slab hot rolling is 1150°C, and the heat preservation is 100min. After the heat preservation, the non-lubricated hot rolling is carried out on the two-roller reversible experimental hot rolling mill and hot rolled to 3.5mm by 12 passes. The starting rolling temperature is 1150°C, and the final rolling is The temperature was 900°C, and then cooled to room temperature in air. The hot-rolled plate was pickled with 5% hydrochloric acid solution, the pickling temperature was 50°C, and the pickling time was 10 min to remove the surface oxide scale.

[0031] The pickled plate is heated t...

Embodiment 2

[0035] Vacuum induction furnace is used to cast high-silicon steel ingots, and its chemical composition by weight percentage is: Si 6.95%, Al 0.55%, Y 0.015%, Zr 0.065%, C 0.007%, Mn 0.008%, P 0.005%, S 0.004% , N0.002%, O 0.002%, the balance Fe. At a temperature of 1230°C, after 90 minutes of heat preservation, air free forging was used to form a 35mm thick billet. The heating temperature of the slab hot rolling is 1180°C, and it is kept for 90 minutes. Then, it is hot-rolled without lubrication on a two-roll reversible experimental hot rolling mill and hot-rolled to 3.0mm after 11 passes. The starting rolling temperature is 1130°C, and the final rolling temperature is to 880°C, then air-cooled to room temperature. Use 6% concentration of hydrochloric acid solution to pickle the hot-rolled plate, the pickling temperature is 60°C, and the pickling time is 15min to remove the surface oxide scale.

[0036] Put the pickled plate in a heating furnace and heat it to 580°C. After ...

Embodiment 3

[0040] Vacuum induction furnace is used to cast high-silicon steel ingots, and its chemical composition by weight percentage is: Si 6.98%, Al 0.7%, Y 0.02%, Zr 0.08%, C 0.008%, Mn 0.007%, P 0.005%, S 0.004% , N0.002%, O 0.002%, the balance Fe. At a temperature of 1250°C, after holding for 80 minutes, the billet was free-forged into a 30mm-thick billet by air. The heating temperature of the slab hot rolling is 1200°C, and it is kept for 80 minutes. Then it is hot-rolled without lubrication on a two-roll reversible experimental hot rolling mill and hot-rolled to 2.5mm after 12 passes. The starting rolling temperature is 1100°C, and the final rolling temperature is to 870°C, then air-cooled to room temperature. Use 8% hydrochloric acid solution to pickle the hot-rolled plate, the pickling temperature is 70°C, and the pickling time is 20min to remove the surface oxide scale.

[0041] Put the pickled plate in a heating furnace and heat it to 620°C. After holding for 5 minutes, ta...

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Abstract

The invention relates to a high-silicon steel sheet and a cryogenic pack rolling technology for preparing same, and belongs to the technical field of steel rolling technologies. The high-silicon steelsheet comprises the following chemical components in percentage by weight: 6.91-6.98% of Si, 0.4-0.7% of Al, 0.008-0.02% of Y, 0.05-0.08% of Zr, less than 0.01% of C, less than 0.01% of Mn, less than0.01% of P, less than 0.01% of S, less than 0.003% of N, less than 0.003% of O, and the balance Fe; and the sheet is 0.1-0.15mm in thickness. The invention provides a microalloying method for addingheavy rare earth yttrium and zirconium eemnets to high-silicon steel to improve the plasticity. Under that basis, the high-silicon steel sheet is prepared by a novel technology combining asynchronouswarm rolling and deep cold rolling; grains are refined through microalloying of Y and Zr, and the generated ordered phases is reduced, so that the plasticity of the high-silicon steel sheet is improved, and the thickness of the high-silicon steel sheet is reduced by deep cold rolling, and as a result, the soft magnetic performance of a product is improved.

Description

technical field [0001] The invention relates to a high-silicon steel thin plate and a cryogenic stack rolling process for preparing the thin plate, belonging to the technical field of steel rolling process. Background technique [0002] With the rapid development of my country's national economy and the improvement of people's living standards, in order to meet the urgent needs of domestic power consumption growth, the power industry has developed rapidly, which has led to the vigorous development of electrical steel. Electrical steel is one of the most important metal functional materials for manufacturing transformer cores, motors and various electrical components. The production process is long and complicated, and it has become an important symbol to measure a country's special steel manufacturing technology level. When the Si content in electrical steel increases to 4.5%, not only the iron loss reaches a very low level, but also the magnetostriction coefficient will be ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0231C21D8/0236C21D8/0247C22C33/04C22C38/005C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 黄艳茹蔡国君刘佳乐苗文婧
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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