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Grain-oriented magnetic steel sheet, steel sheet for finish annealing, annealing separating agent, method for manufacturing grain-oriented magnetic steel sheet, and method for manufacturing steel sheet for finish annealing

A technology for annealing and separating agent, electromagnetic steel sheet, applied in the direction of manufacturing tools, circuits, magnetic objects, etc., can solve the problems of reduced adhesion, peeling, and reduced adhesion between the primary film and the base metal steel plate, and achieves excellent adhesion. , excellent magnetic properties

Active Publication Date: 2021-07-30
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the interface between the base steel plate and the primary coating becomes flatter, the embedded structure of the primary coating that creates the physical bonding force between the primary coating and the base steel plate disappears, resulting in a decrease in the adhesion between the primary coating and the base steel plate
In particular, it becomes easy to peel off due to the compressive stress generated by bending, and the adhesion is significantly reduced

Method used

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  • Grain-oriented magnetic steel sheet, steel sheet for finish annealing, annealing separating agent, method for manufacturing grain-oriented magnetic steel sheet, and method for manufacturing steel sheet for finish annealing
  • Grain-oriented magnetic steel sheet, steel sheet for finish annealing, annealing separating agent, method for manufacturing grain-oriented magnetic steel sheet, and method for manufacturing steel sheet for finish annealing
  • Grain-oriented magnetic steel sheet, steel sheet for finish annealing, annealing separating agent, method for manufacturing grain-oriented magnetic steel sheet, and method for manufacturing steel sheet for finish annealing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0356] MgO, a compound containing a group Y element, and a compound containing a group Ca element were mixed with water so that the content of each group element was as shown in Table 2, and an aqueous slurry coated on a steel sheet after decarburization annealing was prepared. At this time, the abundance ratio (CY, CC) of the compound species and each group element is changed.

[0357] The results are shown in Table 4. When the primary coating remaining rate is 90% or more, it is judged that the primary coating has excellent adhesion to the base steel sheet. It was found that samples satisfying the requirements of the present invention had good characteristics. In addition, if the magnetic flux density B8 is 1.92 or more and the generation amount of point defects is 5 pieces / m 2 Hereinafter, it was judged that it is effective in suppressing point defects. It was found that the samples satisfying the specification of the present invention suppressed point defects. Referrin...

Embodiment 2

[0374] MgO, Ti group element containing compound, Y group element total containing compound, and Ca group element containing compound are mixed with water so that the content of each group element is as shown in Table 5, and the water property of coating on the steel sheet after decarburization annealing is adjusted. slurry. At this time, the abundance ratio (CY, CC, CT) of the compound species and each group element is changed.

[0375] [table 5]

[0376]

[0377] The results are shown in Table 6. When the primary coating remaining rate is 90% or more, it is judged that the primary coating has excellent adhesion to the base steel sheet. Other benchmarks also refer to Example 1. Referring to Table 6, it was found that samples satisfying the requirements of the present invention had good properties.

[0378] On the other hand, in Test Nos. 53 and 56, the total presence ratio of Ti group elements was too large in CT, and Ti-based inclusions were formed in the steel during...

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Abstract

Provided are: a grain-oriented magnetic steel sheet which has excellent magnetic characteristics and in which adhesiveness of a primary coating film to a base material steel sheet is excellent, and which is unlikely to cause a defect where a base material is exposed in a spotty manner; and a method for manufacturing the grain-oriented magnetic steel sheet. The present invention is characterized by being provided with a base material steel sheet and a primary coating film, wherein the primary coating film satisfies (1) number density D3 of Al-concentrated region is 0.015-0.150 pieces / mum2, (2) (area size S5 of region that is inserted oxide layer region and Al-concentrated region) / (area size S3 of Al-concentrated region) >= 0.30, (3) distance H5 obtained by subtracting H0 from an average value of lengths in the plate thickness direction of region that is inserted oxide layer region and Al-concentrated region, is 0.4-4.0 mum, (4) (peripheral length L5 of region that is inserted oxide layer region and Al-concentrated region) / (observation area size S0) is 0.020-0.500mum / mum2, and (5) (area size S1 of inserted oxide layer region) / (observation area size S0) >= 0.15.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet, a steel sheet for finished annealing, an annealing separator, a method for manufacturing a grain-oriented electrical steel sheet, and a method for manufacturing a steel sheet for finished annealing. Background technique [0002] The grain-oriented electrical steel sheet is a steel sheet that contains about 0.5 to 7% of Si in mass % and concentrates the crystal orientation in the {110}<001> orientation (Goss orientation). For the control of crystal orientation, a catastrophic grain growth phenomenon called secondary recrystallization is used. [0003] The manufacturing method of the grain-oriented electrical steel sheet is as follows. The slab is heated and hot-rolled to manufacture a hot-rolled steel sheet. The hot-rolled steel sheet is annealed as needed. The hot-rolled steel sheets are pickled. The pickled hot-rolled steel sheet is cold-rolled at a cold-rolling ratio ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C21D9/46C22C38/00C22C38/60H01F1/147C23C22/00
CPCC21D9/46C22C38/00C22C38/60C21D2201/05C21D6/008C21D8/1233C21D8/1255C21D8/1272C21D8/1283C21D8/1261C23C22/07C23C22/74C22C38/02H01F1/14775H01F1/16C04B35/053C21D3/04C04B35/62625C04B35/62222C04B2235/5436C04B2235/5445C04B2235/5463C04B2235/5472C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3225C04B2235/3227C04B2235/3229Y02P10/20C22C38/004C22C38/16C22C38/008C22C38/04C22C38/06C22C38/001C23C22/00H01F1/147C21D8/0205C21D8/0226C21D8/0236
Inventor 山县龙太郎森重宣乡田中一郎
Owner NIPPON STEEL CORP