EP0099617A2 - Method for producing cube-on-edge oriented silicon steel - Google Patents

Method for producing cube-on-edge oriented silicon steel Download PDF

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Publication number
EP0099617A2
EP0099617A2 EP83302009A EP83302009A EP0099617A2 EP 0099617 A2 EP0099617 A2 EP 0099617A2 EP 83302009 A EP83302009 A EP 83302009A EP 83302009 A EP83302009 A EP 83302009A EP 0099617 A2 EP0099617 A2 EP 0099617A2
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EP
European Patent Office
Prior art keywords
steel
cold
cube
silicon steel
oriented silicon
Prior art date
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Granted
Application number
EP83302009A
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German (de)
French (fr)
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EP0099617B1 (en
EP0099617A3 (en
Inventor
Robert Frederick Miller
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Allegheny Ludlum Steel Corp
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Allegheny Ludlum Steel Corp
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Publication of EP0099617A3 publication Critical patent/EP0099617A3/en
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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
    • 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
    • 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
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling

Definitions

  • This invention relates to a method of producing cube-on-edge oriented silicon steel.
  • Cube-on-edge oriented silicon steel in the form of sheets, is known for use in various electrical applications, including the manufacture of transformer cores.
  • the alloy With cube-on-edge silicon steel 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.
  • the present invention provides a method of producing cube-on-edge oriented silicon steel, characterized by reduced watt loss, including the steps of hot-rolling, cold-rolling with intermediate annealing and a final texture annealing which comprises normalizing said steel to effect decarburization and primary recrystallization followed by cold-deformation prior to said final texture annealing.
  • this steel is conventionally processed by hot rolling followed by one or more cold rolling operations with intermediate anneals.
  • a normalizing operation to achieve primary recrystallization and decarburization.
  • normalizing is conducted at temperatures within the range of 704 to 871 0 C (1300 to 1600°F).
  • cold deformation as by a cold-rolling operation.
  • the steel is final texture annealed in the conventional manner to achieve secondary recrystallization.
  • the method of the present invention reduces both the permeability at high induction levels and the size of the grains formed during final texture annealing.
  • the current trend in electrical steel usage is toward lower inductions and significant improvements have been made in lowering core losses or watt losses by reducing the sheet thickness.
  • Commercially available material typically ranges from .014 to .011 inch (.35 to .28mm), and may be .009 inch (.23mm) and lower.

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

Abstract

An improvement in the manufacture of cube-on-edge oriented silicon steel; the improvement comprises normalizing said steel followed by cold deformation prior to final texture annealing, whereby reduced watt loss is achieved.

Description

  • This invention relates to a method of producing cube-on-edge oriented silicon steel.
  • Cube-on-edge oriented silicon steel, in the form of sheets, is known for use in various electrical applications, including the manufacture of transformer cores. With cube-on-edge silicon steel 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. In applications for this material, and specifically when used in the manufacture of transformer cores, 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.
  • It is accordingly an object of the present invention to provide a method whereby cube-on-edge silicon steel may be provided with a fine secondary grain or crystal structure after texture annealing, which achieves reduced watt loss.
  • The present invention provides a method of producing cube-on-edge oriented silicon steel, characterized by reduced watt loss, including the steps of hot-rolling, cold-rolling with intermediate annealing and a final texture annealing which comprises normalizing said steel to effect decarburization and primary recrystallization followed by cold-deformation prior to said final texture annealing.
  • With respect to cube-on-edge silicon steel to which the present invention is directed, this steel is conventionally processed by hot rolling followed by one or more cold rolling operations with intermediate anneals. After cold rolling the steel is subjected to a normalizing operation to achieve primary recrystallization and decarburization. Typically, normalizing is conducted at temperatures within the range of 704 to 8710C (1300 to 1600°F). In accordance with the invention, after normalizing the steel is subjected to cold deformation as by a cold-rolling operation. After cold deformation, the steel is final texture annealed in the conventional manner to achieve secondary recrystallization. It has been found that by cold deforming in accordance with the invention following normalizing and prior to texture annealing secondary grain growth is inhibited during final texture annealing, which results in reduced watt loss. For this purpose, cold rolling to achieve an elongation within the range of 5 to 15% has been found to be effective for the purpose. It has been found that by varying the amount of cold reduction the grain size after texture annealing may be regulated. Although the practice of the invention finds utility with cube-on-edge silicon steels generally it is particularly adapted to steels of this type within the following composition limits in percent by weight:
    Figure imgb0001
  • By way of specific example two heats of the alloy identified SX-14 (Heat Nos. 154684 and 153595) were melted to the following composition in percent by weight:
    Figure imgb0002
    This material was processed in the conventional manner by hot rolling followed by a cold-rolling operation. Then it was subjected to a final normalizing treatment comprising continuous annealing at a temperature of 800 C (14750 F) which served to decarburize the steel and effect primary recrystallization. The normalized steel in strip form was cut to lengths suitable for cold rolling and rolled in a 4- high cold rolling mill at ambient temperature. The extent of plastic deformation was determined by measuring the percent elongation over a 610mm (24") span scribed on the steel strip before cold rolling. For control purposes samples of the steel were retained prior to cold rolling. The material was cut into standard Epstein strip samples and roller coated with a water slurry of MgO+ .75%B. Texture annealing was performed in dry hydrogen. The anneal cycle consisted of charging the steel into a furnace at 1400°F (760°C), heating at 50°F (28°C) per hour to 2150°F (1175°C), holding 20 hours at 2150°F (1175°C) and furnace cooling. Magnetic testing and grain size measurements were made after this texture annealing operation. Table I lists the magnetic properties and grain size of the material tested.
    Figure imgb0003
  • The method of the present invention reduces both the permeability at high induction levels and the size of the grains formed during final texture annealing. The current trend in electrical steel usage is toward lower inductions and significant improvements have been made in lowering core losses or watt losses by reducing the sheet thickness. Commercially available material typically ranges from .014 to .011 inch (.35 to .28mm), and may be .009 inch (.23mm) and lower.
  • As such materials are used at lower inductions, of the order of 15 kilogauss or lower, the reduction in permeability at high inductions becomes less important in electrical equipment. Also, as the sheet thicknesses are reduced, core losses arising from eddy currents appear to be more dependent upon the material grain size, i.e., core losses decrease with decreasing grain size. The advantages of the present invention establish that it is of substantial importance in the manufacture of thin sheet, of the order of less than .015 inch to .004 inch (.38 to .lmm) thick, and suitable for use in transformers.

Claims (5)

1. A method of producing cube-on-edge oriented silicon steel, characterized by reduced watt loss, including the steps of hot-rolling, cold-rolling with intermediate annealing and a final texture annealing, characterized in normalizing said steel to effect decarburization and primary recrystallization followed by cold-deformation prior to said final texture annealing.
2. A method according to claim 1, characterized in that said cold-deformation includes at least one cold-rolling operation.
3. A method according to claim 2, characterized in that said cold-rolling operation effects an elongation of said steel within the range of 5 to 15%.
4. A method according to claim 1, 2 or 3, characterized in that the steel is normalized at a temperature within the range of 704 to 871°C (1300 to 1600°F).
5. A cube-on-edge oriented silicon steel of less than 0.38mm (0.015-inch) thick made in accordance with the method of any one of claims 1 to 4.
EP83302009A 1982-07-19 1983-04-11 Method for producing cube-on-edge oriented silicon steel Expired EP0099617B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39967482A 1982-07-19 1982-07-19
US399674 1982-07-19

Publications (3)

Publication Number Publication Date
EP0099617A2 true EP0099617A2 (en) 1984-02-01
EP0099617A3 EP0099617A3 (en) 1984-06-06
EP0099617B1 EP0099617B1 (en) 1986-12-30

Family

ID=23580516

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83302009A Expired EP0099617B1 (en) 1982-07-19 1983-04-11 Method for producing cube-on-edge oriented silicon steel

Country Status (8)

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EP (1) EP0099617B1 (en)
JP (1) JPS5928523A (en)
KR (1) KR860000349B1 (en)
BR (1) BR8301547A (en)
CA (1) CA1202549A (en)
DE (1) DE3368685D1 (en)
PL (1) PL242745A1 (en)
RO (1) RO86076B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1084647C (en) * 1999-11-30 2002-05-15 沈阳工业大学 Technology for manufacturing fully-threaded bright and high-strength very long screw bolt

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB610440A (en) * 1945-04-12 1948-10-15 British Thomson Houston Co Ltd Improvements in and relating to the production of preferred crystal orientation in thin gauge silicon steel
GB816705A (en) * 1954-12-29 1959-07-15 Gen Electric Improved process for treating silicon steel
US3130094A (en) * 1959-06-11 1964-04-21 Armco Steel Corp Manufacture of silicon-iron having cubic texture
FR1438853A (en) * 1964-07-01 1966-05-13 Yawata Iron & Steel Co Process for producing thin extremely low carbon steel sheets
US3770517A (en) * 1972-03-06 1973-11-06 Allegheny Ludlum Ind Inc Method of producing substantially non-oriented silicon steel strip by three-stage cold rolling
US4251296A (en) * 1979-05-11 1981-02-17 Westinghouse Electric Corp. Method of preparing an oriented-low-alloy iron from an ingot of controlled sulfur, manganese and oxygen contents

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220297A (en) * 1975-08-08 1977-02-16 Nippon Steel Corp Method of manufacture of uni-directional electromagnetic steel plate h aving excellent magnetic properties

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB610440A (en) * 1945-04-12 1948-10-15 British Thomson Houston Co Ltd Improvements in and relating to the production of preferred crystal orientation in thin gauge silicon steel
GB816705A (en) * 1954-12-29 1959-07-15 Gen Electric Improved process for treating silicon steel
US3130094A (en) * 1959-06-11 1964-04-21 Armco Steel Corp Manufacture of silicon-iron having cubic texture
FR1438853A (en) * 1964-07-01 1966-05-13 Yawata Iron & Steel Co Process for producing thin extremely low carbon steel sheets
US3770517A (en) * 1972-03-06 1973-11-06 Allegheny Ludlum Ind Inc Method of producing substantially non-oriented silicon steel strip by three-stage cold rolling
US4251296A (en) * 1979-05-11 1981-02-17 Westinghouse Electric Corp. Method of preparing an oriented-low-alloy iron from an ingot of controlled sulfur, manganese and oxygen contents

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1084647C (en) * 1999-11-30 2002-05-15 沈阳工业大学 Technology for manufacturing fully-threaded bright and high-strength very long screw bolt

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Publication number Publication date
RO86076A (en) 1985-04-17
CA1202549A (en) 1986-04-01
EP0099617B1 (en) 1986-12-30
RO86076B (en) 1985-05-01
KR860000349B1 (en) 1986-04-12
PL242745A1 (en) 1984-03-12
KR840004173A (en) 1984-10-10
BR8301547A (en) 1984-04-17
JPS5928523A (en) 1984-02-15
EP0099617A3 (en) 1984-06-06
DE3368685D1 (en) 1987-02-05

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