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Process for producing grain-oriented electromagnetic steel sheet

A technology of electromagnetic steel sheet and grain orientation, which is applied in the manufacture of inductors/transformers/magnets, manufacturing tools, circuits, etc. The effect of improving the damage characteristics and improving the qualified rate of products

Active Publication Date: 2015-05-27
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned prior art, due to the influence of fluctuations in material components, fluctuations in the manufacturing conditions of the process before the primary recrystallization annealing, etc., there is variation in the fine-graining effect in the product coil, so it is difficult to The problem of obtaining the iron loss reduction effect stably over the entire length of the product coil

Method used

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  • Process for producing grain-oriented electromagnetic steel sheet
  • Process for producing grain-oriented electromagnetic steel sheet
  • Process for producing grain-oriented electromagnetic steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Will contain C: 0.06 mass %, Si: 3.3 mass %, Mn: 0.08 mass %, S: 0.023 mass %, sol.Al: 0.03 mass %, N: 0.007 mass %, Cu: 0.2 mass % and Sb: 0.02 mass % % of the steel billet was heated at 1430°C for 30 minutes, then hot-rolled to form a hot-rolled sheet with a thickness of 2.2 mm, and after annealing the hot-rolled sheet at 1,000°C for 1 minute, it was cold-rolled to form an intermediate sheet with a thickness of 1.5 mm. After performing intermediate annealing for 2 minutes at ℃, the final cold rolling was performed to form a cold-rolled sheet with a thickness of 0.23 mm. Then, implement the temperature-rising condition (the temperature-rising rate S in the range of 500°C to 600°C 1 , Heating rate S in the range of 600℃~700℃ 2 And the oxygen potential P of the atmosphere in the range of 500-700°C H2O / P H2 ) as shown in Table 1, heated and soaked at 840°C for 2 minutes, combined with primary recrystallization annealing combined with decarburization annealing, after t...

Embodiment 2

[0053] After heating the billets with various compositions shown in Table 2 at 1430°C for 30 minutes, they were hot-rolled to form hot-rolled sheets with a thickness of 2.2 mm, and after annealing the hot-rolled sheets at 1,000°C for 1 minute, they were cold-rolled and formed. It was formed to a thickness of 1.5 mm, intermediate annealed at 1100° C. for 2 minutes, and then cold-rolled to form a cold-rolled sheet with a final thickness of 0.23 mm. Linear grooves were formed by electrolytic etching to refine magnetic domains. Next, primary recrystallization annealing combined with decarburization annealing was performed on the above-mentioned cold-rolled sheet, and thereafter, 10% by mass of TiO was added with MgO as the main component. 2 The water-slurry annealing separator is coated on the surface of the steel sheet and dried, and after being wound into a coil, the final annealing is performed, and the coating / sintering of the phosphate-based insulating tension coating is combi...

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Abstract

A process for producing a grain-oriented electromagnetic steel sheet, the process comprising hot-rolling a steel slab that contains, in terms of mass%, 0.001-0.20% C, 1.0-5.0% Si, 0.03-1.0% Mn, 0.005-0.040% S and / or Se, 0.003-0.050% sol. Al, and 0.0010-0.020% N, cold-rolling the sheet to a final sheet thickness, subjecting the sheet to primary recrystallization annealing, thereafter applying an annealing separator that comprises MgO as the main component, and subjecting the coated sheet to final finish annealing, wherein the rate of heating S1 from 500ºC to 600ºC and the rate of heating S2 from 600ºC to 700ºC during the heating in the primary recrystallization annealing are regulated to 100 ºC / s or higher and a value in the range of 30-(0.5×S1) ºC / s, respectively. Preferably, the atmosphere for 500-700ºC is regulated so as to have an oxidation potential PH2O / PH2 of 0.05 or less. Thus, the product coil is made to have finer secondary-recrystallization grains throughout the entire length thereof and have a reduced core loss.

Description

technical field [0001] The present invention relates to a method for manufacturing a grain-oriented electrical steel sheet, and more specifically, to a method for manufacturing a grain-oriented electrical steel sheet excellent in iron loss characteristics over the entire length of a product coil. Background technique [0002] Electrical steel sheets generally include grain-oriented electrical steel sheets and non-oriented electrical steel sheets, and are widely used as core materials for transformers, generators, and the like. In particular, the former grain-oriented electrical steel sheet has magnetic properties effective for reducing energy loss in transformers and generators because it is highly concentrated in the {110}<001> orientation called Goss orientation. In addition, as technologies for further reducing the iron loss of grain-oriented electrical steel sheets, reduction in sheet thickness, increase in Si content, improvement in orientation of crystal orientat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/00C22C38/60H01F1/16
CPCC22C38/60C22C38/001C22C38/02C22C38/04C22C38/06C21D8/1222C21D8/1233C21D8/1272C21D8/1283H01F1/18C21D6/001C21D6/002C21D6/005C21D6/008C21D8/0236C21D8/0247C21D8/1244C21D9/46C22C38/002C22C38/008C22C38/08C22C38/12C22C38/14C22C38/16C22C38/34C21D8/12C22C38/00H01F1/14775H01F1/16H01F41/02
Inventor 千田邦浩渡边诚新垣之启大村健
Owner JFE STEEL CORP