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
  • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
  • C21D8/1283—Application of a separating or insulating coating
• • 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
  • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
  • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
  • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
  • C25D5/48—After-treatment of electroplated surfaces
  • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D9/00—Electrolytic coating other than with metals
  • C25D9/04—Electrolytic coating other than with metals with inorganic materials
  • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
  • C25D9/10—Electrolytic coating other than with metals with inorganic materials by cathodic processes on iron or steel
• • 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
  • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
  • C21D8/1272—Final recrystallisation annealing

Definitions

• the present invention relates to a method for producing coated grain oriented silicon steel.
• the method of the invention provides an improvement in the conventional practice of producing grain oriented silicon steel wherein a melt of the steel is produced containing from O2 to D6% carbon, up to .008% boron, up to .01% nitrogen, up to .05% aluminium and from 2.5 to 4% silicon, with the balance iron.
• a melt of the steel is produced containing from O2 to D6% carbon, up to .008% boron, up to .01% nitrogen, up to .05% aluminium and from 2.5 to 4% silicon, with the balance iron.
• the melt is cast, hot rolled, cold rolled and decarburized.
• a coating is applied to the surface of the steel comprising Mg (OH) 2 and Si0 2 and thereafter the steel is final texture annealed with the coating thereon. It has been found that with this coating a significant improvement is achieved with respect to the magnetic properties of the steel after texture annealing.
• the coating may comprise in percent by weight, 87.5 to 97Mg(OH) 2 and 3 to 12.5 Si0 2 , preferably 88 to 96 Mg(OH) 2 and 4 to 12 Si0 2 . It is preferred practice that the coating be electrolytically applied by the use of a magnesium acetate electrolyte. The coating may also be applied by mixing the coating constituents with water and applying as a slurry, but this practice is not preferred. Also the constituents could be applied as individual layers, but this is likewise not preferred.
• This steel was in the conventional manner hot rolled, and cold rolled to a thickness of 0.264mm (.0104 in.) prior to conventional decarburization.
• the surfaces of various samples of the steel were coated both in the conventional practice and in accordance with the practice of the invention and the magnetic properties e.g. core loss and magnetic permeability at 10 oersteds, were determined as reported in Table 1.
• Table II indicates the improvement achieved in accordance with the practice of the invention over conventional practice from the standpoint of the relatively shorter time required to deposit on the steel surface a coating of similar weight.

Landscapes

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

Applications Claiming Priority (2)

Publications (2)

Family

ID=22872725

Family Applications (1)

Country Status (6)

Cited By (2)

Citations (3)

• 1982
  • 1982-01-06 CA CA000393646A patent/CA1197757A/en not_active Expired
  • 1982-01-18 EP EP82300236A patent/EP0057983A3/de not_active Withdrawn
  • 1982-01-19 KR KR1019820000200A patent/KR830009247A/ko unknown
  • 1982-01-26 RO RO106445A patent/RO84030B/ro unknown
  • 1982-02-01 JP JP1471282A patent/JPS57145935A/ja active Pending
  • 1982-02-05 PL PL23496482A patent/PL234964A1/xx unknown

Patent Citations (3)

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