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Grain-oriented electrical steel sheet, and method for producing same

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the direction of inductance/transformer/magnet manufacturing, manufacturing tools, circuits, etc., can solve the problems of the balance of manufacturing costs such as the limit, and achieve reduced iron loss, low iron loss, and excellent iron loss sexual effect

Active Publication Date: 2015-07-22
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are limitations in the control of crystal orientation and the reduction of impurities in terms of balance with manufacturing costs, etc.

Method used

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  • Grain-oriented electrical steel sheet, and method for producing same
  • Grain-oriented electrical steel sheet, and method for producing same
  • Grain-oriented electrical steel sheet, and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] Steel slabs having the composition shown in Table 1 were manufactured by continuous casting, heated to 1430° C., and then hot-rolled to form hot-rolled sheets with a thickness of 1.6 mm. Then, hot-rolled sheets were annealed at 1,000° C. for 10 seconds. Next, it is made into an intermediate plate thickness of 0.55mm by cold rolling, and the 2 O / PH 2 = 0.37, temperature 1100°C, and time 100 seconds were used for intermediate annealing. Then, after removing the secondary scale on the surface by hydrochloric acid pickling, cold rolling was performed again to obtain a cold-rolled sheet having a thickness of 0.23 mm.

[0120] Next, implement the oxidation degree PH 2 O / PH 2 =0.45, decarburization annealing at a soaking temperature of 850°C for 150 seconds, and then coating an annealing separator with MgO as the main component. At this time, as shown in Table 2, the application amount of the annealing separator and the winding tension after the application of the annealin...

Embodiment 2

[0131] Steel slabs having the composition shown in Table 1 were manufactured by continuous casting, heated to 1430° C., and then hot-rolled to form hot-rolled sheets with a thickness of 1.6 mm. Then, hot-rolled sheets were annealed at 1,000° C. for 10 seconds. Next, it is made into an intermediate plate thickness of 0.55mm by cold rolling, and the 2 O / PH 2 = 0.37, temperature 1100°C, and time 100 seconds were used for intermediate annealing. Then, after removing the secondary scale on the surface by hydrochloric acid pickling, cold rolling was performed again to obtain a cold-rolled sheet having a thickness of 0.23 mm.

[0132] Next, implement the oxidation degree PH 2 O / PH 2 =0.45, decarburization annealing at a soaking temperature of 850°C for 150 seconds, and then coating an annealing separator with MgO as the main component. At this point, the coating amount of the annealing separator is 12g / m 2 , take-up tension is 60N / mm 2 . Then, final annealing for the purpose o...

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Abstract

The present invention provides a grain oriented electrical steel sheet that has been subjected to magnetic domain refining treatment by means of electron beam irradiation and exhibits excellent low-noise properties when assembled as an actual transformer, in which tension exerted on the steel sheet by the forsterite film is 2.0 MPa or higher both in a rolling direction and a direction transverse (perpendicular) to the rolling direction, and a ratio of an irradiation pitch in a thermal strain introduced region (B) to a spot diameter (A) on an electron beam irradiation surface satisfies a relation: 0.5 ‰¤ B / A ‰¤ 5.0.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet suitable as a core material of a transformer or the like, and a method for producing the same. Background technique [0002] Grain-oriented electrical steel sheets are mainly used as iron cores of transformers, and require excellent magnetization characteristics, especially low iron loss. [0003] Therefore, it is important to highly align the secondary recrystallized grains in the steel sheet with the (110)[001] orientation (so-called Goss orientation) and to reduce impurities in the finished steel sheet. In addition, there are limitations in the control of crystal orientation and the reduction of impurities in terms of balance with production costs and the like. Therefore, a technique for reducing iron loss by introducing non-uniformity into the surface of the steel sheet by physical means, that is, a magnetic domain refinement technique, is being developed. [0004] For examp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00B21B3/02C21D1/38C21D8/12C21D9/46C22C38/04C22C38/60H01F1/16H01F1/18
CPCH01F1/18H01F41/00C22C38/008C22C38/04C21D2201/05C21D8/1288C22C38/00C21D8/1272C22C38/08B21B3/02
Inventor 大村健山口广冈部诚司
Owner JFE STEEL CORP