JPS5565367A - Forming method for forsterite insulation coating of directional silicon steel sheet - Google Patents

Forming method for forsterite insulation coating of directional silicon steel sheet

Info

Publication number
JPS5565367A
JPS5565367A JP13747478A JP13747478A JPS5565367A JP S5565367 A JPS5565367 A JP S5565367A JP 13747478 A JP13747478 A JP 13747478A JP 13747478 A JP13747478 A JP 13747478A JP S5565367 A JPS5565367 A JP S5565367A
Authority
JP
Japan
Prior art keywords
sheets
silicon steel
directional silicon
forsterite
annealing
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.)
Pending
Application number
JP13747478A
Other languages
Japanese (ja)
Inventor
Shigeru Kobayashi
Toshiro Ichida
Hiroshi Shimanaka
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.)
JFE Steel Corp
Original Assignee
Kawasaki 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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP13747478A priority Critical patent/JPS5565367A/en
Publication of JPS5565367A publication Critical patent/JPS5565367A/en
Pending 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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnetism (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

PURPOSE:To form a good forsterite insulation coating composed of oxidation film containing greater SiO2 content compared with usual method and a least fayalite, by decarbonizing and annealing applying metal sulfate water solution on both faces of directional silicon steel sheets. CONSTITUTION:Sulphate water solution of metals containing one kind or more of Fe, Co, Ni, Cr, Zn, Mg, Mn, Al, is applied on the directional silicon steel sheets rolling at the last sheet thickness. Next, the above sheets are dried and used weight per unit area of sulphate is made 0.1-1.0g/m<2> in drying condition. Then, applied and dried sheets are decarbonized and annealed in wet hydrogen at 700-900 deg.C successively and oxidation film mainly composed of SiO2 and fayalite (Fe2SiO4), having used weight per unit area of oxygen of 1.0-2.0g/m<2>, is formed. Further, decarbonized and annealed sheets are rolled around a coil after applying annealing separation agent mainly composed of MgO having hydration quantity of 1-4%. Then, constant temperature of secondary recrystallization is kept in the above condition and moreover, desired forsterite insulati coating is formed on the sheets carrying out a high temperature hydrogen annealing at 1100-1200 deg.C.
JP13747478A 1978-11-08 1978-11-08 Forming method for forsterite insulation coating of directional silicon steel sheet Pending JPS5565367A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13747478A JPS5565367A (en) 1978-11-08 1978-11-08 Forming method for forsterite insulation coating of directional silicon steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13747478A JPS5565367A (en) 1978-11-08 1978-11-08 Forming method for forsterite insulation coating of directional silicon steel sheet

Publications (1)

Publication Number Publication Date
JPS5565367A true JPS5565367A (en) 1980-05-16

Family

ID=15199450

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13747478A Pending JPS5565367A (en) 1978-11-08 1978-11-08 Forming method for forsterite insulation coating of directional silicon steel sheet

Country Status (1)

Country Link
JP (1) JPS5565367A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0488726A2 (en) * 1990-11-30 1992-06-03 Kawasaki Steel Corporation Thin decarburized grain oriented silicon steel sheet having improved coating and magnetic characteristics
WO1993001329A1 (en) * 1991-07-10 1993-01-21 Nippon Steel Corporation Unidirectional silicon steel sheet having excellent film properties
JPH10212526A (en) * 1997-01-28 1998-08-11 Nippon Steel Corp Production of grain oriented silicon steel sheet excellent in glass coating

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0488726A2 (en) * 1990-11-30 1992-06-03 Kawasaki Steel Corporation Thin decarburized grain oriented silicon steel sheet having improved coating and magnetic characteristics
EP0488726A3 (en) * 1990-11-30 1994-02-23 Kawasaki Steel Co
WO1993001329A1 (en) * 1991-07-10 1993-01-21 Nippon Steel Corporation Unidirectional silicon steel sheet having excellent film properties
JPH10212526A (en) * 1997-01-28 1998-08-11 Nippon Steel Corp Production of grain oriented silicon steel sheet excellent in glass coating

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