Grain-oriented electrical steel sheet and method for manufacturing same

A technology of electromagnetic steel plate and manufacturing method, which is applied in the direction of circuits, magnetic objects, magnetic materials, etc., can solve the problems of the limit of impurities, and achieve the effect of excellent iron loss reduction effect

Active Publication Date: 2015-01-14
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there is a limit in the control of crystal orientation and t

Method used

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  • Grain-oriented electrical steel sheet and method for manufacturing same
  • Grain-oriented electrical steel sheet and method for manufacturing same
  • Grain-oriented electrical steel sheet and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Containing C: 0.06%, Si: 3.3%, Mn: 0.08%, S: 0.023%, Al: 0.03%, N: 0.007%, Cu: 0.2% and Sb: 0.02%, and the balance is Fe and unavoidable The slab with impurities was heated at 1430°C for 30 minutes, then hot-rolled to form a hot-rolled sheet with a thickness of 2.2mm, and then annealed at 1000°C for 1 minute, and then cold-rolled until the thickness of the sheet: 1.5mm. Rolling and intermediate annealing at 1100° C. for 2 minutes, and then cold rolling to a final plate thickness of 0.23 mm. Next, linear grooves are formed by electrolytic etching or pressing with protruding rolls. Thereafter, decarburization annealing was performed at 840° C. for 2 minutes, and 10% by mass of TiO was contained in MgO: 90% by mass having a viscosity (30 minutes after mixing with water) and physical properties shown in Table 1. 2 The mixed powder was mixed with water (solid content ratio: 15% by mass), and stirred for 30 minutes to form a slurry, and an annealing separator with the viscos...

Embodiment 2

[0112] After heating the billet containing the components shown in Table 2-1 and Table 2-2 at 1430°C for 30 minutes, it was hot-rolled to form a hot-rolled sheet with a thickness of 2.2mm, and annealed at 1000°C for 1 minute. Then implement cold rolling up to plate thickness: 1.5mm, and further implement intermediate annealing at 1100°C for 2 minutes. According to the cold rolling conditions shown in Table 3 (the maximum temperature on the input and output sides is 170°C or less. The number of passes is two. The maximum temperature of the input and output side is 200°C or more, and the number of passes is three times) to make a final plate thickness of 0.23 mm, and form linear grooves by electrolytic etching.

[0113] Next, after performing decarburization annealing at 840° C. for 2 minutes, MgO (viscosity (after 30 minutes after mixing with water) is 40 cP) as the main component (93% by mass) and 6% by mass of TiO 2 , 1% by mass SrSO 4 The annealing separating agent and wate...

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Abstract

Provided is a grain-oriented electrical steel sheet having a linear groove forming an angle of 45° or less with the direction perpendicular to the direction of rolling, wherein a grain-oriented electrical steel sheet having low iron loss characteristics, on which a magnetic domain subdivision treatment by chemical means is used, is provided by setting the incidence of microparticles having a length of 1 mm or less in the rolling direction in a bottom part of the groove to 10% or less (also including cases in which microparticles are not present), providing a forsterite coating in which the Mg weight per side of the steel sheet is at least 0.6 g/m2 in the groove, and setting the angle (beta angle) between a rolling surface and the <100> axis of a secondary recrystallized grain oriented in the rolling direction of the steel sheet to an average value of 3° or less.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet used as an iron core material for transformers and the like, and a method for manufacturing the same. Background technique [0002] Grain-oriented electrical steel sheets are mainly used as iron cores of transformers, which require excellent magnetization characteristics, especially low iron loss. [0003] Therefore, it is important to highly concentrate secondary recrystallized grains in the steel sheet in the (110)[001] orientation (so-called Goss orientation) and to reduce impurities in the product steel sheet. [0004] However, there are limits in the control of crystal orientation and reduction of impurities due to trade-off with manufacturing cost and the like. Therefore, a method of reducing iron loss by introducing linear strain into a grain-oriented electrical steel sheet to narrow the magnetic domain width is known. [0005] As a method of improving iron loss by narrow...

Claims

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Application Information

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IPC IPC(8): C22C38/00B21B3/02C21D8/12C22C38/60C23F1/02C25F3/02H01F1/16
CPCC22C38/002C21D8/1283C22C38/04C22C38/60C21D8/1244H01F1/16C22C38/06C22C38/004C22C38/008C22C38/02B21B3/02C21D2201/05C21D8/12C22C38/16C22C38/001C22C38/00C25F1/06C25F3/06C25F3/14C22C38/12C22C38/34C22C38/42Y10T428/24545C21D8/1233H01F1/14775C21D1/26
Inventor 千田邦浩井上博贵冈部诚司
Owner JFE STEEL CORP
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