US3770517A - Method of producing substantially non-oriented silicon steel strip by three-stage cold rolling - Google Patents

Method of producing substantially non-oriented silicon steel strip by three-stage cold rolling Download PDF

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US3770517A
US3770517A US00232212A US3770517DA US3770517A US 3770517 A US3770517 A US 3770517A US 00232212 A US00232212 A US 00232212A US 3770517D A US3770517D A US 3770517DA US 3770517 A US3770517 A US 3770517A
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percent
steel
silicon steel
cold rolling
temperature
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US00232212A
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T Gray
J Martin
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Allegheny Ludlum Corp
Pittsburgh National Bank
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Allegheny Ludlum Industries Inc
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    • 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
    • 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
    • C21D8/1266—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 between cold rolling steps

Definitions

  • ABSTRACT Described is a method of producing substantially nonoriented silicon steel by a three-stage cold rolling process wherein the silicon steel is temper rolled in the third or last rolling stage after normalizing to effect a reduction in gauge of about 2 to 12 percent, followed by annealing at a temperature no greater than l,700 F for a time no longer than about 5 minutes.
  • Thepresent invention provides a method for producing substantially non-oriented silicon steel, which complies with the A.I.S.I. M-l9 requirements, from relatively high silicon steels such as the following:
  • the advantages of utilizing high silicon material in the production of non-oriented silicon steel is the ability to employ a single melting and production prac tice while avoiding the need to manufacture multiple compositions for different purposes. That is, the high silicon steel can be used for both the non-oriented and oriented types. Another advantage is that the process of the invention permits the use of excess quantities of high silicon material which may be produced in the mill and which, by practicing the invention, can be diverted to the production of non-oriented products.
  • silicon steel containing 2.90 to 3.40 percent by weight of silicon is temper rolled in a normalized condition to effect a controlled reduction. Following temper rolling, the steel is then stress relief annealed, preferably at a temperature less than l,700 F.
  • a typical process for producing the normalized steel of the invention is as follows:
  • the process of the invention involves a three-stage cold rolling process wherein the last cold rolling step comprises temper rolling and wherein the strip is normalized between the second rolling step and the temper rolling step.
  • Temper rolling to effect a reduction of about 2'to 12 percent has been found to be necessary to adequately destroy the potential for secondary recrystallization while controlling the tendency for recrystallization to occur at lower temperatures. That is to say, it has been found that at least about a 2 percent reduction in the temper rolling step, and preferably about at least a 4 percent reduction, is desirable to produce material of minimum directionality.
  • the stress relief anneal set forth in step 12 above, is preferably carried out at less than l,700 F in a nonoxidizing atmosphere such as hydrogen or a nitrogenhydrogen mixture for up to about 5 minutes at temperature. At these low annealing temperatures, however, little sulfur is removed. When low sulfur products are desired, therefore, a low sulfur material (e.g., less than 0.0! percent) should be used.
  • a nonoxidizing atmosphere such as hydrogen or a nitrogenhydrogen mixture
  • Example No. 1 Steel of the same ladle chemistry of Example No. 1, was processed in the same manner except for being given a 7 percent temper roll to gage shown in Table 111 followed by a 1,600 F anneal in pure dry hydrogen. Properties of the steel are also shown in that table.

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

Abstract

Described is a method of producing substantially non-oriented silicon steel by a three-stage cold rolling process wherein the silicon steel is temper rolled in the third or last rolling stage after normalizing to effect a reduction in gauge of about 2 to 12 percent, followed by annealing at a temperature no greater than 1,700* F for a time no longer than about 5 minutes.

Description

United States Patent 1 Gray et al.
[ METHOD OF PRODUCING SUBSTANTIALLY NON-ORIENTED SILICON STEEL STRIP BY THREE-STAGE COLD ROLLING [75] Inventors: Thomas 11. Gray, Pittsburgh; Jack P.
Martin, Lower Burrell, both of Pa.
[73] Assignee: Allegheny Ludlum Industries, Inc.,
' Pittsburgh, Pa.
22 Filed: Mar. 6, 1972 21 Appl. No.2 232,212
Related U.S. Application Data [63] Continuation-in-part of Ser. No. 68,790, Sept. 1,
1970, abandoned.
l48/3l.55 [51] Int. Cl; H011 H04 [58] Field of Search 148/111, 110, 112,
l48/3l.55,120,12l
[ Nov. 6, 1973 Primary Examiner-L. Dewayne Rutledge Assistant ExaminerW. R. Satterfield Attorney-Vincent G. Gioia et al.
[57] ABSTRACT Described is a method of producing substantially nonoriented silicon steel by a three-stage cold rolling process wherein the silicon steel is temper rolled in the third or last rolling stage after normalizing to effect a reduction in gauge of about 2 to 12 percent, followed by annealing at a temperature no greater than l,700 F for a time no longer than about 5 minutes.
5 Claims, No Drawings METHOD OF PRODUCING SUBSTANTIALLY NON-ORIENTED SILICON STEEL STRIP BY THREE-STAGE'COLD ROLLING CROSS REFERENCES TO RELATED APPLICATIONS This application is a continuation-in-part of now abandoned copendingapplication Ser. No. 68,790 filed Sept. 1, 1970 and assigned to the assignee of the present application.
BACKGROUND OF THE INVENTION maximum core loss for A.I.S.l. M-19 transformer grade i s'l .64 watts per pound at KB. Semi-processed (i.e., unannealed material) has a maximum core loss requirement for A.I.SLI. M-l9 grade'of 1.68 watts per pound at 15 KB. I
SUMMARY OF THE INVENTION Thepresent invention provides a method for producing substantially non-oriented silicon steel, which complies with the A.I.S.I. M-l9 requirements, from relatively high silicon steels such as the following:
General Range Element Typical 2.90-3.40 Silicon 3.15 Traces 0.06 Carbon 0.028 0.03-0.10 Manganese 0.065 Up to 0.03 Sulfur 0.020 Upto 0.020 Phosphorus 0.008 0.05 max. Aluminum 0.0l 0030-090 Copper 0.080 Up to 0.2 Nickel 0.050
Among the advantages of utilizing high silicon material in the production of non-oriented silicon steel is the ability to employ a single melting and production prac tice while avoiding the need to manufacture multiple compositions for different purposes. That is, the high silicon steel can be used for both the non-oriented and oriented types. Another advantage is that the process of the invention permits the use of excess quantities of high silicon material which may be produced in the mill and which, by practicing the invention, can be diverted to the production of non-oriented products.
Previous attempts to produce non-oriented products by using high silicon steels have generally been unsatisfactory because of the necessity for utilizing high temperature annealing treatments to develop properties. Such requirements impose undue burdens on fabricators in terms of equipment needs and cost.
DESCRIPTION OF PREFERRED EMBODIMENT ln carrying out the invention, silicon steel containing 2.90 to 3.40 percent by weight of silicon is temper rolled in a normalized condition to effect a controlled reduction. Following temper rolling, the steel is then stress relief annealed, preferably at a temperature less than l,700 F. A typical process for producing the normalized steel of the invention is as follows:
1. Heat ingot for a minimum of 5 hours at a temperature over 2,300 F, including 3 hours at not less than 2,400 P.
2. Roll on blooming mill to produce a slab having a thickness of 5 to 8 inches and a temperature not less than 2,250" F.
3. Reduce the slab to a thickness of three-fourths to 1% inches and maintain at a temperature not less than 2,000 F. Such reduction is at a fast rate and preferably accomplished in three passes on a single strand reversing mill.
4. Admit the reduced slab at a temperature not less than 2,000 F to the first stand of a six-stand finishing mill and effect a reduction in the strip to a thickness of about 0.060 to 0.10 inch at a speed to insure a temperature not less than 1,600 F at the front and back end of the strip.
5. Descale the hot rolled strip.
6. Where desired, box or open anneal the hot rolled strip at a temperature between l,400and 2,000 F, followed by a descaling treatment. 7
7. Cold roll the annealed strip in a first cold rolling step to a thickness of about 1.3 to 2.5 times the final thickness.
8. Open anneal the cold rolled strip at a temperature between l,600and l,850 F.
9. Cold roll in a second cold rolling step to a thickness approximately 2 to l2percent greater than the desired final thickness.
10. Open anneal the cold rolled strip to normalize the same, preferably in a decarburizing atmosphere as in a wet reducing gas at a temperature substantially between 1,400 and l,550 F.
ll. Temper roll the normalized product to effect a reduction of about 2 to 12 percent.
12. Stress relief anneal at a temperature less than 1,700 Fin a non-oxidizing atmosphere for up to about 5 minutes at temperature.
As can be seen, the process of the invention involves a three-stage cold rolling process wherein the last cold rolling step comprises temper rolling and wherein the strip is normalized between the second rolling step and the temper rolling step. Temper rolling to effect a reduction of about 2'to 12 percent has been found to be necessary to adequately destroy the potential for secondary recrystallization while controlling the tendency for recrystallization to occur at lower temperatures. That is to say, it has been found that at least about a 2 percent reduction in the temper rolling step, and preferably about at least a 4 percent reduction, is desirable to produce material of minimum directionality. On the other hand, if the steel is unduly worked due to a reduction in temper rolling greater than about 12 percent, the minimum temperature for primary recrystallization is reduced and it will be difficult to obtain a coarsened primary recrystallized structure of the type desired for the intended applications.
The stress relief anneal, set forth in step 12 above, is preferably carried out at less than l,700 F in a nonoxidizing atmosphere such as hydrogen or a nitrogenhydrogen mixture for up to about 5 minutes at temperature. At these low annealing temperatures, however, little sulfur is removed. When low sulfur products are desired, therefore, a low sulfur material (e.g., less than 0.0! percent) should be used.
The following examples illustrate various embodiments of the invention:
Example No. 1
Steel having ladle chemistry shown in Table I was processed as normal oriented silicon steel strip would through final normalizing, whereupon it was temper rolled 8 percent -giving gages as shown in Table I1 and annealed at 1,500 F in pure, dry hydrogen for 15 minutes in hot zone of mesh belt furnace 4 minutes at temperature). Properties obtained on Epstein packs of strips 1.5 X 15.25 cm. are also given in Table ll. Al1 results are of 60 cycle tests.
Example No. 2
Steel of the same ladle chemistry of Example No. 1, was processed in the same manner except for being given a 7 percent temper roll to gage shown in Table 111 followed by a 1,600 F anneal in pure dry hydrogen. Properties of the steel are also shown in that table.
TABLE 111 High Loss Low Loss End of Coil End of Coil All Longitudinal WPP at 15 KB 1.31 1.17 All Transverse WPP at 15 KB 1.78 1.89 A Long. A Trans. WPP at 15 KB 1.53 1.48 Final Gage of Sample .0125" .0123" Example N0. 3
Steel having the ladle chemistry given in Table IV was processed as normal oriented silicon steel strip until after final normalizing whereupon the sample was rolled 7 percent to gage shown, then annealed at 1,600 F in an 80 percent nitrogen 20 percent hydrogen atmosphere for the same time as Examples 1 and 2. Properties on Epstein samples are shown in Table V.
TABLE IV C Mn P S Si Cr Ni Al Cu Sn TABLE V High Loss Low Loss End of Coil End of Coil All Longitudinal WPP at 15 KB 1.46 1.42 All Transverse WPP at 15 KB 1.95 2.03 A Long. 5% Trans. WPP at 15 KB 1.65 1.64 Final Gage of Sample .0125" .0124" It is apparent from the foregoing examples that all of the materials processed in accordance with the teachings of the invention have a core loss below 1.64 watts per pound at 15 KB, the maximum core loss for an A.I.S.l. M-19 transformer grade.
Although the invention has been described in connection with certain specific embodiments, it will be readily apparent to those skilled in the art that various changes in method steps and composition can be made to suit requirements without departing from the spirit and scope of the invention.
We claim: l. A method of producing substantially non-oriente silicon steel strip exhibiting a core loss below 1.64 watts per pound at 15 KB, and consisting essentially in percent by weight of 2.9 to 3.4 percent silicon, traces to 0.06 percent carbon, 0.03 to 0.1 percent manganese, up to 0.03 percent sulfur, up to 0.02 percent phosphorus, 0.03 to 0.9 percent copper, up to 0.2 percent nickel, and the balance essentially iron, which comprises the steps of:
heating an ingot of silicon steel at a temperature in excess of 2,300 F,
hot rolling said steel,
descaling the hot rolled steel,
cold rolling the hot rolled steel in a first cold rolling process to a thickness of 1.3 to 2.5 times the final thickness of the product,
annealing the cold rolled strip at a temperature between l,600 and l,850 F,
cold rolling the annealed cold rolled strip in a second cold rolling operation to a thickness which exceeds the final thickness of the product by about 2to 12 percent, normalizing the cold rolled steel after the second cold rolling operation at a temperature between 1,400 and 1,550 F,
temper rolling the normalized steel to effect a reduction of about 2 to 12 percent to achieve the final thickness of the product, and
stress relief annealing the temper rolled steel at a temperature no greater than 1,700 F and for a time period no greater than 5 minutes.
2. The method of claim 11 wherein said steel is temper rolled to effect a 4 to 12 percent reduction.
3. The method of claim 11 wherein said steel is stress relief annealed in a non-oxidizing atmosphere.
4. The method of claim 3 wherein said steel is stressrelief annealed in a hydrogen-containing atmosphere.
5. The method of claim 1 wherein said steel has less than 0.01 percent sulfur.

Claims (4)

  1. 2. The method of claim 1 wherein said steel is temper rolled to effect a 4 to 12 percent reduction.
  2. 3. The method of claim 1 wherein said steel is stress relief annealed in a non-oxidizing atmosphere.
  3. 4. The method of claim 3 wherein said steel is stress-relief annealed in a hydrogen-containing atmosphere.
  4. 5. The method of claim 1 wherein said steel has less than 0.01 percent sulfur.
US00232212A 1972-03-06 1972-03-06 Method of producing substantially non-oriented silicon steel strip by three-stage cold rolling Expired - Lifetime US3770517A (en)

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855020A (en) * 1973-05-07 1974-12-17 Allegheny Ludlum Ind Inc Processing for high permeability silicon steel comprising copper
US3855019A (en) * 1973-05-07 1974-12-17 Allegheny Ludlum Ind Inc Processing for high permeability silicon steel comprising copper
US3855018A (en) * 1972-09-28 1974-12-17 Allegheny Ludlum Ind Inc Method for producing grain oriented silicon steel comprising copper
US3925115A (en) * 1974-11-18 1975-12-09 Allegheny Ludlum Ind Inc Process employing cooling in a static atmosphere for high permeability silicon steel comprising copper
US3929522A (en) * 1974-11-18 1975-12-30 Allegheny Ludlum Ind Inc Process involving cooling in a static atmosphere for high permeability silicon steel comprising copper
US3930906A (en) * 1974-02-28 1976-01-06 Kawasaki Steel Corporation Method for forming an insulating glass film on a grain-oriented silicon steel sheet having a high magnetic induction
US3988177A (en) * 1973-11-05 1976-10-26 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Method of producing cold rolled, silicon-alloyed electric sheets
US4046602A (en) * 1976-04-15 1977-09-06 United States Steel Corporation Process for producing nonoriented silicon sheet steel having excellent magnetic properties in the rolling direction
US4123299A (en) * 1978-09-29 1978-10-31 General Electric Company Method of producing silicon-iron sheet materal, and product
US4204890A (en) * 1977-11-11 1980-05-27 Kawasaki Steel Corporation Method of producing non-oriented silicon steel sheets having an excellent electromagnetic property
US4319936A (en) * 1980-12-08 1982-03-16 Armco Inc. Process for production of oriented silicon steel
US4330348A (en) * 1979-12-13 1982-05-18 Nippon Steel Corporation Method for heating continuously cast steel slab for production of grain-oriented silicon steel sheet having high magnetic flux density
EP0099617A2 (en) * 1982-07-19 1984-02-01 Allegheny Ludlum Steel Corporation Method for producing cube-on-edge oriented silicon steel
US4439251A (en) * 1978-06-16 1984-03-27 Nippon Steel Corporation Non-oriented electric iron sheet and method for producing the same
US4478653A (en) * 1983-03-10 1984-10-23 Armco Inc. Process for producing grain-oriented silicon steel
US4753692A (en) * 1981-08-05 1988-06-28 Nippon Steel Corporation Grain-oriented electromagnetic steel sheet and process for producing the same
EP0422223A1 (en) * 1988-02-03 1991-04-17 Nkk Corporation Method of manufacturing non-oriented electromagnetic steel plates with excellent magnetic characteristics
EP0423331A1 (en) * 1988-02-03 1991-04-24 Nkk Corporation Method of manufacturing non-oriented electromagnetic steel plates with excellent magnetic characteristics
US5013372A (en) * 1987-06-18 1991-05-07 Kawasaki Steel Corporation Semi-process non-oriented electromagnetic steel strip having low core loss and high magnetic permeability, and method of making
US5102478A (en) * 1989-02-23 1992-04-07 Nkk Corporation Method of making non-oriented magnetic steel strips
US5108521A (en) * 1989-02-21 1992-04-28 Nkk Corporation Method of making non-oriented magnetic steel strips
US5108522A (en) * 1988-03-04 1992-04-28 Nkk Corporation Method of making non-oriented electrical steel sheets having excellent magnetic properties under low magnetic field
EP0486703A1 (en) * 1990-06-12 1992-05-27 Nippon Steel Corporation Process for producing nondirectional electrical steel sheet excellent in magnetic properties after stress relieving annealing
EP0490617A3 (en) * 1990-12-10 1993-09-15 Kawasaki Steel Corporation Method for producing non-oriented electromagnetic steel strip having superior magnetic properties and appearance
EP0684320A1 (en) * 1994-04-26 1995-11-29 LTV STEEL COMPANY, Inc. Process of making electrical steels
US6068708A (en) * 1998-03-10 2000-05-30 Ltv Steel Company, Inc. Process of making electrical steels having good cleanliness and magnetic properties
US6217673B1 (en) 1994-04-26 2001-04-17 Ltv Steel Company, Inc. Process of making electrical steels
CN105239005A (en) * 2015-11-27 2016-01-13 武汉钢铁(集团)公司 High-permeability non-oriented silicon steel and production method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2067036A (en) * 1932-11-19 1937-01-05 Wimmer Anton Process of producing metals for electrical purposes
US2075283A (en) * 1934-09-04 1937-03-30 Ig Farbenindustrie Ag Production of magnetizable alloy
US2867557A (en) * 1956-08-02 1959-01-06 Allegheny Ludlum Steel Method of producing silicon steel strip
US2992952A (en) * 1955-12-01 1961-07-18 Vacuumschmelze Ag Method of manufacturing magnetic sheets
US3115430A (en) * 1960-09-20 1963-12-24 Armco Steel Corp Production of cube-on-edge oriented silicon iron
US3513039A (en) * 1966-09-14 1970-05-19 Vacuumschmelze Gmbh Process for reduction of core losses in cube textured iron-silicon alloys

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2067036A (en) * 1932-11-19 1937-01-05 Wimmer Anton Process of producing metals for electrical purposes
US2075283A (en) * 1934-09-04 1937-03-30 Ig Farbenindustrie Ag Production of magnetizable alloy
US2992952A (en) * 1955-12-01 1961-07-18 Vacuumschmelze Ag Method of manufacturing magnetic sheets
US2867557A (en) * 1956-08-02 1959-01-06 Allegheny Ludlum Steel Method of producing silicon steel strip
US3115430A (en) * 1960-09-20 1963-12-24 Armco Steel Corp Production of cube-on-edge oriented silicon iron
US3513039A (en) * 1966-09-14 1970-05-19 Vacuumschmelze Gmbh Process for reduction of core losses in cube textured iron-silicon alloys

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855018A (en) * 1972-09-28 1974-12-17 Allegheny Ludlum Ind Inc Method for producing grain oriented silicon steel comprising copper
US3855019A (en) * 1973-05-07 1974-12-17 Allegheny Ludlum Ind Inc Processing for high permeability silicon steel comprising copper
US3855020A (en) * 1973-05-07 1974-12-17 Allegheny Ludlum Ind Inc Processing for high permeability silicon steel comprising copper
US3988177A (en) * 1973-11-05 1976-10-26 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Method of producing cold rolled, silicon-alloyed electric sheets
US3930906A (en) * 1974-02-28 1976-01-06 Kawasaki Steel Corporation Method for forming an insulating glass film on a grain-oriented silicon steel sheet having a high magnetic induction
US3925115A (en) * 1974-11-18 1975-12-09 Allegheny Ludlum Ind Inc Process employing cooling in a static atmosphere for high permeability silicon steel comprising copper
US3929522A (en) * 1974-11-18 1975-12-30 Allegheny Ludlum Ind Inc Process involving cooling in a static atmosphere for high permeability silicon steel comprising copper
US4046602A (en) * 1976-04-15 1977-09-06 United States Steel Corporation Process for producing nonoriented silicon sheet steel having excellent magnetic properties in the rolling direction
US4204890A (en) * 1977-11-11 1980-05-27 Kawasaki Steel Corporation Method of producing non-oriented silicon steel sheets having an excellent electromagnetic property
US4439251A (en) * 1978-06-16 1984-03-27 Nippon Steel Corporation Non-oriented electric iron sheet and method for producing the same
US4123299A (en) * 1978-09-29 1978-10-31 General Electric Company Method of producing silicon-iron sheet materal, and product
US4330348A (en) * 1979-12-13 1982-05-18 Nippon Steel Corporation Method for heating continuously cast steel slab for production of grain-oriented silicon steel sheet having high magnetic flux density
US4319936A (en) * 1980-12-08 1982-03-16 Armco Inc. Process for production of oriented silicon steel
US4753692A (en) * 1981-08-05 1988-06-28 Nippon Steel Corporation Grain-oriented electromagnetic steel sheet and process for producing the same
US4863532A (en) * 1981-08-05 1989-09-05 Nippon Steel Corporation Grain-oriented electromagnetic steel sheet
EP0099617A2 (en) * 1982-07-19 1984-02-01 Allegheny Ludlum Steel Corporation Method for producing cube-on-edge oriented silicon steel
EP0099617A3 (en) * 1982-07-19 1984-06-06 Allegheny Ludlum Steel Corporation Method for producing cube-on-edge oriented silicon steel
US4478653A (en) * 1983-03-10 1984-10-23 Armco Inc. Process for producing grain-oriented silicon steel
US5013372A (en) * 1987-06-18 1991-05-07 Kawasaki Steel Corporation Semi-process non-oriented electromagnetic steel strip having low core loss and high magnetic permeability, and method of making
EP0422223A1 (en) * 1988-02-03 1991-04-17 Nkk Corporation Method of manufacturing non-oriented electromagnetic steel plates with excellent magnetic characteristics
US5116436A (en) * 1988-02-03 1992-05-26 Nkk Corporation Method of making non-oriented electrical steel sheets having excellent magnetic properties
EP0422223A4 (en) * 1988-02-03 1993-02-24 Nkk Corporation Method of manufacturing non-oriented electromagnetic steel plates with excellent magnetic characteristics
EP0423331A4 (en) * 1988-02-03 1993-02-24 Nkk Corporation Method of manufacturing non-oriented electromagnetic steel plates with excellent magnetic characteristics
EP0423331A1 (en) * 1988-02-03 1991-04-24 Nkk Corporation Method of manufacturing non-oriented electromagnetic steel plates with excellent magnetic characteristics
US5108522A (en) * 1988-03-04 1992-04-28 Nkk Corporation Method of making non-oriented electrical steel sheets having excellent magnetic properties under low magnetic field
US5108521A (en) * 1989-02-21 1992-04-28 Nkk Corporation Method of making non-oriented magnetic steel strips
US5102478A (en) * 1989-02-23 1992-04-07 Nkk Corporation Method of making non-oriented magnetic steel strips
EP0486703A4 (en) * 1990-06-12 1995-01-11 Nippon Steel Corp Process for producing nondirectional electrical steel sheet excellent in magnetic properties after stress relieving annealing
EP0486703A1 (en) * 1990-06-12 1992-05-27 Nippon Steel Corporation Process for producing nondirectional electrical steel sheet excellent in magnetic properties after stress relieving annealing
US5259892A (en) * 1990-06-12 1993-11-09 Nippon Steel Corporation Process for producing non-oriented electromagnetic steel sheet having excellent magnetic properties after stress relief annealing
EP0490617A3 (en) * 1990-12-10 1993-09-15 Kawasaki Steel Corporation Method for producing non-oriented electromagnetic steel strip having superior magnetic properties and appearance
EP0684320A1 (en) * 1994-04-26 1995-11-29 LTV STEEL COMPANY, Inc. Process of making electrical steels
US5609696A (en) * 1994-04-26 1997-03-11 Ltv Steel Company, Inc. Process of making electrical steels
USRE35967E (en) * 1994-04-26 1998-11-24 Ltv Steel Company, Inc. Process of making electrical steels
US6217673B1 (en) 1994-04-26 2001-04-17 Ltv Steel Company, Inc. Process of making electrical steels
US6068708A (en) * 1998-03-10 2000-05-30 Ltv Steel Company, Inc. Process of making electrical steels having good cleanliness and magnetic properties
CN105239005A (en) * 2015-11-27 2016-01-13 武汉钢铁(集团)公司 High-permeability non-oriented silicon steel and production method
CN105239005B (en) * 2015-11-27 2017-03-22 武汉钢铁(集团)公司 High-permeability non-oriented silicon steel and production method

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