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Low-core-loss grain-oriented electromagnetic steel sheet and method for manufacturing same

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the direction of manufacturing tools, circuits, magnetic objects, etc., can solve the problems of insufficient reduction of eddy current loss, large secondary recrystallization grains, etc., and achieve low iron loss and improved iron loss characteristics Effect

Active Publication Date: 2017-08-29
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this technology, the secondary recrystallized grains become huge, and the hysteresis loss is excellent, but the eddy current loss cannot be sufficiently reduced, so there is a limit to the reduction of iron loss

Method used

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  • Low-core-loss grain-oriented electromagnetic steel sheet and method for manufacturing same
  • Low-core-loss grain-oriented electromagnetic steel sheet and method for manufacturing same
  • Low-core-loss grain-oriented electromagnetic steel sheet and method for manufacturing same

Examples

Experimental program
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Effect test

Embodiment 1

[0105] Manufactured by continuous casting method containing C: 0.070% by mass, Si: 3.50% by mass, Mn: 0.12% by mass, Al: 0.025% by mass, and N: 0.012% by mass, the remainder consisting of Fe and unavoidable impurities The steel billet was reheated to a temperature of 1415° C. by induction heating, and then hot-rolled to obtain a hot-rolled sheet having a thickness of 2.5 mm. Next, after the hot-rolled sheet was annealed at 1000°C for 50 seconds, it was cold-rolled to an intermediate thickness of 1.9 mm, and after intermediate annealing at 1100°C for 25 seconds, it was finally cold-rolled. Refined into a cold-rolled plate with a plate thickness of 0.23 mm (final cold-rolled reduction rate of 87.9%).

[0106] Next, continuous linear grooves with a width of 70 μm and a depth of 28 μm were formed by electrolytic etching at a crossing angle of 75° with respect to the rolling direction on one surface of the cold-rolled sheet, with the interval d in the rolling direction being 3 mm. ...

Embodiment 2

[0118] Manufactured by continuous casting method containing C: 0.080% by mass, Si: 3.3% by mass, Mn: 0.12% by mass, Al: 0.025% by mass, and N: 0.012% by mass, with the remainder consisting of Fe and unavoidable impurities The steel billet is reheated to a temperature of 1400°C by induction heating, and then hot-rolled to make a hot-rolled sheet with a thickness of 2.6mm. mm intermediate thickness, after intermediate annealing at 1100°C for 30 seconds, final cold rolling with a reduction ratio of 89.4%, and a refined cold-rolled sheet with a thickness of 0.23mm.

[0119] Next, primary recrystallization annealing combined with decarburization annealing at 840° C. for 120 seconds was performed on the cold-rolled sheet. At this time, the temperature of 400°C during the heating process is maintained for 1.5 seconds, and then heated between 400°C and 700°C at a temperature increase rate of 150°C / s, and then the temperature from 700°C to 700°C is used as the soaking temperature. The...

Embodiment 3

[0127] Manufactured by continuous casting with a composition containing C: 0.080% by mass, Si: 3.40% by mass, Mn: 0.10% by mass, Al: 0.024% by mass, and N: 0.080% by mass, with the remainder consisting of Fe and unavoidable impurities The steel billet is reheated to a temperature of 1420°C by induction heating, and then hot-rolled to make a hot-rolled sheet with a thickness of 2.4mm. After annealing the hot-rolled sheet at 1100°C×40 seconds, it is cold-rolled to After performing intermediate annealing at 1100° C. for 25 seconds for a plate thickness of 1.7 mm, final cold rolling was performed at a reduction rate of 86.4%, and a cold-rolled plate with a plate thickness of 0.23 mm was refined.

[0128] Next, primary recrystallization annealing combined with decarburization annealing at 845° C. for 100 seconds was performed on the cold-rolled sheet. At this time, after performing the holding treatment at a temperature of 500°C for 3 seconds during the heating process, heating is ...

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Abstract

During manufacturing of a grain-oriented electromagnetic steel sheet by subjecting a Si-containing steel slab to hot rolling, cold rolling, primary recrystallization annealing, and finish annealing and forming a tension-imparting coating thereon, a grain-oriented electromagnetic steel sheet having good core loss characteristics is obtained by retention for 1 to 10 seconds at a temperature T from 250 to 600DEG C in the heating process of the primary recrystallization annealing, heating at a rate of 80 DEG C / s in the range of the temperature T to 700 DEG C and 15 DEG C / s in the range of 700 DEG C to a soaking temperature, setting the oxygen potential in the range of 700 DEG C to the soaking temperature to 0.2 to 0.4 and the oxygen potential during soaking to 0.3 to 0.5, and configuring secondary recrystallized grains so that the area ratio for which the deviation angle alpha from the (110)<001> ideal orientation is less than 6.5degrees is at least 90%, the area ratio for which the deviation angle beta is less than 2.5degrees is at least 75%, the average length (L) in a rolling direction is 20 mm or less, and the average value (beta) (degrees) of the deviation angle beta satisfies the expression 15.63* (beta) + [L] <44.06.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet which is suitable for use as an iron core material such as a transformer and has excellent magnetic properties, especially iron loss properties, and a method for producing the same. Background technique [0002] Grain-oriented electrical steel sheets are magnetic materials mainly used as iron core materials for transformers, generators, and rotating equipment, and require low energy loss (iron loss) generated inside the iron core due to excitation. [0003] As one of the techniques for reducing the iron loss of grain-oriented electrical steel sheets, there is a technique of highly uniforming the Goss (Goss) orientation ({110}<001>) of crystal grains in one direction toward the rolling direction of the steel sheet to achieve high magnetic permeability. This technology utilizes a phenomenon called secondary recrystallization, that is, grains with a specific orientation, that ...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D8/12C22C38/04C22C38/60H01F1/16
CPCC22C38/00C22C38/04C22C38/60C21D8/1272C22C38/02H01F1/14775C21D8/1294C21D2201/05C21D8/1261C21D8/1288C22C38/001C22C38/002C22C38/008C22C38/06C22C38/12C22C38/16C22C38/54C21D8/12C21D8/1233C21D8/1244C21D8/1283H01F1/16C21D9/46C21D8/005
Inventor 末广龙一寺岛敬高宫俊人渡边诚上坂正宪
Owner JFE STEEL CORP
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