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

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

Example Embodiment

[0028] Example 1

[0029] A vacuum induction furnace is used to cast high silicon steel ingots. The chemical composition of the ingot is as follows: 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, the temperature is kept for 140 minutes and then free-forged with air to form a 40mm thick square billet. The heating temperature during the hot rolling of the cast slab is 1150℃, and the holding time is 100min. After the holding time, the non-lubricated hot rolling is carried out on a two-roll reversible experimental hot rolling mill and hot-rolled to 3.5mm through 12 passes. The opening temperature is 1150℃, and the final rolling The temperature is 900°C, then air-cooled to room temperature. The hot-rolled sheet was pickled with a 5% concentration hydrochloric acid solution, the pickling temperature was 50℃, and the pickling time was 10 min to remove the surface oxide scale.

[0031...

Example Embodiment

[0034] Example 2

[0035] A vacuum induction furnace is used to cast high silicon steel ingots. The chemical composition of the ingot is as follows: 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, hold for 90 minutes and then use air to free forge into a 35mm thick square billet. The heating temperature during the hot rolling of the cast slab is 1180℃, the holding time is 90min, and then the non-lubricated hot rolling is carried out on the two-high reversible experimental hot rolling mill and 11 passes are hot rolled to 3.0mm, the opening temperature is 1130℃, and the final rolling temperature At 880°C, then air-cooled to room temperature. The hot-rolled sheet was pickled with a 6% hydrochloric acid solution, the pickling temperature was 60°C, and the pickling time was 15 minutes to remove the surface oxide scale.

[0036] The pickled plate was heated to 580°C in a heating furnace, ...

Example Embodiment

[0039] Example 3

[0040] A vacuum induction furnace is used to cast high silicon steel ingots. The chemical composition of the ingot is as follows: 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, hold for 80 minutes and then use air to free forge into a 30mm thick square billet. The heating temperature during the hot rolling of the cast slab is 1200℃, the holding time is 80min, and then the non-lubricated hot rolling is carried out on the two-high reversible experimental hot rolling mill and hot rolled to 2.5mm through 12 passes. The opening temperature is 1100℃ and the final rolling temperature At 870°C, then air-cooled to room temperature. The hot-rolled sheet was pickled with 8% hydrochloric acid solution, the pickling temperature was 70°C, and the pickling time was 20 minutes to remove the surface oxide scale.

[0041] The pickled plate was heated to 620°C in a heating furnace, an...

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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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