JPS55158220A - Forming method of insulating film excellent in heat resistance on electrical sheet - Google Patents

Forming method of insulating film excellent in heat resistance on electrical sheet

Info

Publication number
JPS55158220A
JPS55158220A JP6428679A JP6428679A JPS55158220A JP S55158220 A JPS55158220 A JP S55158220A JP 6428679 A JP6428679 A JP 6428679A JP 6428679 A JP6428679 A JP 6428679A JP S55158220 A JPS55158220 A JP S55158220A
Authority
JP
Japan
Prior art keywords
electrical sheet
insulating film
inorg
heat resistance
electrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP6428679A
Other languages
Japanese (ja)
Other versions
JPS6133913B2 (en
Inventor
Kazuo Nakamura
Yoshitaka Hiromae
Hajime Hinoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP6428679A priority Critical patent/JPS55158220A/en
Publication of JPS55158220A publication Critical patent/JPS55158220A/en
Publication of JPS6133913B2 publication Critical patent/JPS6133913B2/ja
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties

Abstract

PURPOSE:To form insulating film excellent in heat resistance on the surface of an electrical sheet, by forming iron oxide film on the surface of the electrical sheet during continuous annealing, then by painting rust preventive oil suspended with inorg. material on the film so as to form inorg. coating. CONSTITUTION:On the surface of an electrical sheet which is used for iron core, such as silicon steel plate, pure iron base low carbon steel plate, is formed electrical insulating film in order to prevent the occurrence of eddy current during use. For that purpose, in continuous annealing of the electrical sheet at a temp. 700-850 deg.C for 0.2-3min, 0.03-0.1% oxygen or a suitable amount of water is added to the annealing atmosphere or to the atmosphere of cooling after annealing to form iron oxide film 0.05-0.2mum in thickness on the surface of the iron plate. The electrical sheet is painted with rust preventive oil suspended with inorg. compound such as talc, bentonite, thereby forming inorg. film together with the oxide film 0.15- 0.2mum in thickness. Hereby an electric sheet having insulating film excellent in heat resistance is manufactured.
JP6428679A 1979-05-24 1979-05-24 Forming method of insulating film excellent in heat resistance on electrical sheet Granted JPS55158220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6428679A JPS55158220A (en) 1979-05-24 1979-05-24 Forming method of insulating film excellent in heat resistance on electrical sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6428679A JPS55158220A (en) 1979-05-24 1979-05-24 Forming method of insulating film excellent in heat resistance on electrical sheet

Publications (2)

Publication Number Publication Date
JPS55158220A true JPS55158220A (en) 1980-12-09
JPS6133913B2 JPS6133913B2 (en) 1986-08-05

Family

ID=13253831

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6428679A Granted JPS55158220A (en) 1979-05-24 1979-05-24 Forming method of insulating film excellent in heat resistance on electrical sheet

Country Status (1)

Country Link
JP (1) JPS55158220A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010066497A1 (en) * 2008-12-12 2010-06-17 Voestalpine Stahl Gmbh Method for producing an improved electrical steel strip

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010066497A1 (en) * 2008-12-12 2010-06-17 Voestalpine Stahl Gmbh Method for producing an improved electrical steel strip
DE102008061983B4 (en) * 2008-12-12 2011-12-08 Voestalpine Stahl Gmbh Method for producing an improved electrical steel strip, electrical steel strip and its use
JP2012511628A (en) * 2008-12-12 2012-05-24 フェストアルピネ シュタール ゲーエムベーハー Method for producing an improved electrical steel strip

Also Published As

Publication number Publication date
JPS6133913B2 (en) 1986-08-05

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