Hot-rolled steel sheet for production of non-oriented magnetic steel sheet and process for manufacturing same

A technology for hot-rolled steel sheets and electromagnetic steel sheets, which is applied in the manufacture of inductors/transformers/magnets, manufacturing tools, and magnetic properties of inorganic materials.

Active Publication Date: 2015-07-15
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the effect of improving the magnetic properties by these methods, especially the effect of improving the magnetic flux density, is still not satisfactory, and there are still problems in terms of processability and cycleability.
That is, if the steel contains more than a certain amount of Al, the hardness of the steel sheet will increase, hindering the workability, and there will be a problem that the electrodes of the electric furnace will be damaged if the core material is recycled or waste disposal at home is required.
[0011] In addition, when using recycled materials for iron cores to cast motor shafts, etc., if 0.1% by mass or more of Al is contained, the surface of the molten steel will be oxidized during casting, which will increase the viscosity and deteriorate the fillability of the molten steel in the mold. Hindering good casting is also a problem

Method used

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  • Hot-rolled steel sheet for production of non-oriented magnetic steel sheet and process for manufacturing same
  • Hot-rolled steel sheet for production of non-oriented magnetic steel sheet and process for manufacturing same
  • Hot-rolled steel sheet for production of non-oriented magnetic steel sheet and process for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] The molten steel obtained by blowing in a converter was subjected to a degassing treatment, followed by casting, and a slab having the composition shown in Table 1 was produced. Thereafter, after heating the slab at 1130° C.×1 h, it was hot-rolled to a thickness of 2.0 mm at the final hot-rolling finish temperature and post-hot-rolling coiling temperature conditions shown in Table 2 to obtain a hot-rolled steel sheet. Next, at 100% N 2 The hot-rolled sheets were annealed at 1000° C.×30 seconds in an atmosphere, pickled by immersion in a 7% HCl solution at 80° C. for 60 seconds, and then cold-rolled to the thicknesses shown in Table 2. Thereafter, at 20% H 2 -80%N 2 In the atmosphere, the final annealing was performed under the conditions of 1030° C.×10 seconds, and then the coating treatment was performed.

[0097] Epstein test pieces were cut out from the obtained non-oriented electrical steel sheet along the rolling direction and the direction at right angles to ro...

Embodiment 2

[0103] The molten steel obtained by blowing in a converter was subjected to a degassing treatment, followed by casting, and a slab having the composition shown in Table 3 was produced. Thereafter, after the slab was heated at 1100° C.×1 h, it was hot-rolled to a thickness of 1.6 mm under the conditions of the final hot-rolling finish temperature and the coiling temperature after the hot-rolling finish shown in Table 4. Next, at 100% N 2 The hot-rolled sheet was annealed in an atmosphere at 1000° C. for 30 seconds, and then pickled under the conditions of 7% HCl and 80° C.×60 seconds immersion, and then cold-rolled to the sheet thickness shown in Table 4. Thereafter, at 20% H 2 -80%N 2 In the atmosphere, final annealing was performed under the conditions of 1000° C.×10 seconds to perform coating treatment.

[0104] Epstein test pieces were cut out from the obtained non-oriented electrical steel sheet along the rolling direction and the direction at right angles to rolling, a...

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Abstract

According to the present invention, the pickling weight loss of a hot-rolled steel sheet having a prescribed composition is adjusted to 40 to 100g/m2 as determined after subjecting the hot-rolled steel sheet to annealing at 1000ºC for 30sec in a nitrogen atmosphere and then immersion in a 7% HCl solution at 80ºC for 60sec. Thus, a hot-rolled steel sheet which is for use in producing a nonoriented magnetic steel sheet and which exhibits not only excellent magnetic characteristics such as iron loss and magnetic flux density but also excellent recyclability and sheet surface appearance can be obtained.

Description

technical field [0001] The present invention relates to a hot-rolled steel sheet for a non-oriented electrical steel sheet mainly used as an iron core material for electrical equipment and a method for producing the same, and particularly relates to excellent magnetic properties such as iron loss and magnetic flux density, as well as excellent cycleability and surface appearance of the steel sheet A hot-rolled steel sheet for manufacturing a non-oriented electrical steel sheet and a method for manufacturing the same. Background technique [0002] In recent years, in the world trend of saving energy including electric power, there has been an urgent need to increase the efficiency of electrical equipment. [0003] In addition, from the viewpoint of miniaturization of electrical equipment, there is an increasing demand for miniaturization of iron core materials in particular. [0004] In addition, recently, recycling of iron core materials for electrical equipment has also be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/12C22C38/12C22C38/60H01F1/16
CPCC21D8/1277C22C38/02C21D8/1222C22C38/12C21D8/1261C22C38/60C21D8/12C22C38/00H01F1/16C22C38/34Y02W30/54C22C38/001C22C38/002C22C38/004C22C38/008C22C38/04C22C38/06Y02P10/20B21B1/026B21B15/00H01F1/14775H01F41/02
Inventor 户田广朗财前善彰中西匡尾田善彦
Owner JFE STEEL CORP
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