Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
  • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
  • H01F1/147—Alloys characterised by their composition
  • H01F1/14766—Fe-Si based alloys
  • H01F1/14775—Fe-Si based alloys in the form of sheets
  • H01F1/14783—Fe-Si based alloys in the form of sheets with 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
  • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
  • C21D8/1277—Modifying the physical properties of ferrous metals or ferrous alloys 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
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
  • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
• • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
  • C21D8/1294—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localised treatment

Definitions

• This invention relates to a method of producing cube-on-edge oriented silicon steel in the form of sheets is known for use in various electrical applications including transformer cores.
• the alloy is characterized by secondary recrystallization in the (110) (001) position, which is termed the cube-on-edge position.
• This material in sheet form has the direction of easy magnetization in the direction of rolling.
• the material is required to have reduced watt loss, because the consumption of electrical energy decreases as iron loss decreases. Reduced watt loss may be promoted by achieving fine secondary grain size during texture annealing.
• a silicon steel which has been conventionally processed by hot rolling and cold rolling with intermediate anneals is surface coated with a manganese-bearing material prior to texture annealing and is texture annealed in the conventional manner with said manganese-bearing material thereon.
• a manganese-bearing material particularly suited for use in the invention is Mn 3 (N0 2 ). It has been found that the presence of the manganese-bearing compound during annealing inhibits secondary grain growth and thus reduces watt loss. This may be further enhanced if the steel is serrated prior to texture annealing.
• the practice of the invention finds utility with cube-on-edge oriented silicon steels generally, it is particularly adapted to steels of this type within the following composition limits in percent by weight:
• Epstein packs of final normalized SX-14 composition identified as Heat No. 154684, were coated with a water slurry comprising 300cc of water, 46gm. of MgO and 2gm. of H 3 B0 3 .
• This material with the coating thereon was then texture annealed in a hydrogen atmosphere in the conventional manner.
• the texture annealing consisted of charging the material into a furnace at a temperature of 760°C (1400°F) heating at a rate of 10°C (50°F) per hour to a temperature of 1177 0 C (2150°F), holding at temperature for 12 hours and then cooling to 649 0 C (1200°F), at which time the material was removed from the furnace.
• Epstein packs Prior to the above slurry coating, was painted with a mixture of 30cc of 50% Mn (N0 3 ) 2 and an inert thickner, which was applied in lmm stripes perpendicular to the sheet rolling direction at intervals of lOmm; this painted coating was then air dried.
• This Epstein pack constituted treatment in accordance with the practice of the invention; whereas, the second pack was used as a control and typified a conventional practice.
• the average lineal dimension of the secondary grains of the conventional, control pack specimen in the sheet rolling direction was l3mm.
• the average lineal dimension of the secondary grain of the specimen treated with Mn(N0 3 ) 2 in accordance with the practice of the invention was 7mm; these grains it was observed were often separated by the aforementioned bands of smaller primary grains where normal grain growth was stimulated by the application of the manganese-bearing compound.
• a single Epstein strip of final normalized SX-14 composition from the same heat as in the aforementioned Example 1 was scribed with a metal scribe to produce serrations in the strip perpendicular to the rolling direction at intervals of lOmm.
• the strip was slurry coated and texture annealed under the conditions described above with respect to the first specific example. Following this texture annealing, the average lineal dimension in the sheet rolling direction of the secondary grain in the scribed strip was 9.5mm.

Landscapes

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

Applications Claiming Priority (2)

Publications (2)

Family

ID=23580545

Family Applications (1)

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Cited By (2)

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• 1983
  • 1983-02-25 CA CA000422372A patent/CA1194386A/fr not_active Expired
  • 1983-03-04 KR KR1019830000879A patent/KR890000126B1/ko not_active Expired
  • 1983-03-25 BR BR8301545A patent/BR8301545A/pt unknown
  • 1983-04-11 EP EP83302013A patent/EP0099619A3/fr not_active Withdrawn
  • 1983-05-26 JP JP9332483A patent/JPS5928524A/ja active Granted
  • 1983-06-29 PL PL24275083A patent/PL242750A1/xx unknown

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