JPS5672178A - Formation of forsterite insulating film of directional silicon steel plate - Google Patents

Formation of forsterite insulating film of directional silicon steel plate

Info

Publication number
JPS5672178A
JPS5672178A JP14598579A JP14598579A JPS5672178A JP S5672178 A JPS5672178 A JP S5672178A JP 14598579 A JP14598579 A JP 14598579A JP 14598579 A JP14598579 A JP 14598579A JP S5672178 A JPS5672178 A JP S5672178A
Authority
JP
Japan
Prior art keywords
steel plate
insulating film
separating agent
silicon steel
annealing separating
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
JP14598579A
Other languages
Japanese (ja)
Inventor
Hiroshi Shimanaka
Toshiro Ichida
Shigeru Kobayashi
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 JP14598579A priority Critical patent/JPS5672178A/en
Publication of JPS5672178A publication Critical patent/JPS5672178A/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
    • 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
    • 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

Landscapes

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

Abstract

PURPOSE:To form a forsterite insulating film having a superior characteristic, by holding a specific quantitative relation between the oxygen content in the sub-scale and the coating quantity of the annealing separating agent, in case that the annealing separating agent is coated to the directional silicon steel plate to anneal it after the sub-scale is formed on this plate. CONSTITUTION:The directional silicon steel plate which was processed to the final target thickness by cold rolling is heated at 700-900 deg.C in wet hydrogen and is decarburized and annealed. At this time, a sub-scale where oxygen content OC constituted by SiO2 and fayalite (Fe2SiO4) is 1.0-2.0g/m<2> is formed on the surface of the steel plate. Next, after the annealing separating agent which consists of MgO and Mg(OH)2 and has hydration rate alpha of 0.01-0.04 is applied, the steel plate is taken up into a coil and is heated and annealed in the H2 atmosphere at 1,100- 1,250 deg.C. In this case, the relation indicated by expression [I] is held among the coating quantity CA(g/m<2>) of the annealing separating agent, OC, and alpha, so that a uniform-thickness forsterite insulating film difficult to exfoliate can be formed.
JP14598579A 1979-11-13 1979-11-13 Formation of forsterite insulating film of directional silicon steel plate Pending JPS5672178A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14598579A JPS5672178A (en) 1979-11-13 1979-11-13 Formation of forsterite insulating film of directional silicon steel plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14598579A JPS5672178A (en) 1979-11-13 1979-11-13 Formation of forsterite insulating film of directional silicon steel plate

Publications (1)

Publication Number Publication Date
JPS5672178A true JPS5672178A (en) 1981-06-16

Family

ID=15397513

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14598579A Pending JPS5672178A (en) 1979-11-13 1979-11-13 Formation of forsterite insulating film of directional silicon steel plate

Country Status (1)

Country Link
JP (1) JPS5672178A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59185725A (en) * 1983-04-07 1984-10-22 Nippon Steel Corp Production of grain-oriented electrical steel sheet having excellent magnetic characteristic
JPS59226115A (en) * 1983-06-07 1984-12-19 Kawasaki Steel Corp Production of unidirectionally oriented silicon steel plate having homogeneous forsterite insulating film
JPS60177132A (en) * 1984-02-24 1985-09-11 Nippon Steel Corp Production of grain oriented electrical steel sheet having excellent magnetic characteristic and high magnetic flux density
EP0488726A2 (en) * 1990-11-30 1992-06-03 Kawasaki Steel Corporation Thin decarburized grain oriented silicon steel sheet having improved coating and magnetic characteristics

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116998A (en) * 1974-02-28 1975-09-12

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116998A (en) * 1974-02-28 1975-09-12

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59185725A (en) * 1983-04-07 1984-10-22 Nippon Steel Corp Production of grain-oriented electrical steel sheet having excellent magnetic characteristic
JPS6315967B2 (en) * 1983-04-07 1988-04-07 Nippon Steel Corp
JPS59226115A (en) * 1983-06-07 1984-12-19 Kawasaki Steel Corp Production of unidirectionally oriented silicon steel plate having homogeneous forsterite insulating film
JPS60177132A (en) * 1984-02-24 1985-09-11 Nippon Steel Corp Production of grain oriented electrical steel sheet having excellent magnetic characteristic and high magnetic flux density
JPS6253577B2 (en) * 1984-02-24 1987-11-11 Nippon Steel Corp
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

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