US3908737A - Method for producing grain-oriented electrical steel sheet utilizing a continuous casting process - Google Patents

Method for producing grain-oriented electrical steel sheet utilizing a continuous casting process Download PDF

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Publication number
US3908737A
US3908737A US492867A US49286774A US3908737A US 3908737 A US3908737 A US 3908737A US 492867 A US492867 A US 492867A US 49286774 A US49286774 A US 49286774A US 3908737 A US3908737 A US 3908737A
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United States
Prior art keywords
percent
continuous casting
slab
steel
cooling
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Expired - Lifetime
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US492867A
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English (en)
Inventor
Hisashi Matsunaga
Izumi Matsushita
Kenzou Iwayama
Minoru Motoyoshi
Masafumi Okamoto
Tomohiko Sakai
Takahide Shimadzu
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Nippon Steel Corp
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Nippon Steel Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon

Definitions

  • B represents the magnetic flux density induced. in the steel sheet when magnetization force of 800 A/m is given, and thus indicates indirectly the stability of secondary recrystalli zation.
  • W the value of W "/50 is used for the same purpose, but this represents the loss of electric energy in a 50 cycle alternating magnetic field when the magnetic flux density induced in the steel sheet is at its maximum of 1.7 W ,,,,,,2.
  • the-position of the internal crack correand hydrogen locally expands the steel sheet during an the spacefactor of the final product and deteriorating its appearanceand commercial value. This local expansion defect is generally called as a blister.
  • the present invention is based on the above discoveries and has established a production technic of a grainoriented electrical steel sheet having excellent magnetic properties and free from-blisters by preventing in ternal cracks of steel slabs produced by a continuous casting process.
  • the features of the present invention lie in that a molten steel containing 2.0 to 4.0 percent Si, 0.035 to 0.08 percent c, 0.03 m 0.10 percent Mn, 0.01 to 0.03 percent S and not more than 0.005 percent soLAl is continuously cast, and the continuouslycast steel slab is rapidly cooled and solidified with a water pouring rate of not less than 1.6 l/kg of steel within a range which does not cause cooling cracks of the slab so as to obtain stable and high magnetic properties lnother words, the most important'feature of the present invention lies in that rapid cooling, in place of slow cooling as conventionally adopted, is selected as the solidifying condition in the continuous casting process for the production of a grain-oriented electrical v 'steel sheet utilizing MnS alone as dispersed precipitate for causing the secondary recrystallization soas to ob- I tain continuously cast slabs free from internal cracks and thus having sulfides uniformly dispersed therein.
  • the steel slabs-thusprepared are subjected to the MnS solution heat' treatmentby slab heating and then ordinary hotrollin'g, cold rolling and'first or secondary recrystallization annealing to obtain final products.
  • the molten steel composition is limited as under:
  • this element is added for the purpose of reducing loss of electric energy and Si contents less than 2.0 percent and not effective for the purpose, but on the other hand Si contents beyond 4.0 percent cause difficulties such as raptures during the cold rolling.
  • Mn and S are utilized as dispersed precipitates for the secondary recrystallization, and less than 0.03 percent Mn or less than 0.01 percent S is not enough for assuring a required amount of dispersed precipitates, and on the other hand more than 0.10 percent Mn or more than 0.03 percent S causes difficulty in the solution treatment of MnS during the slab heating, and thus poor secondary recrystallization results.
  • FIG. 2 shows the effect of the internal cracks on the B value and the blister occurence.
  • FIG. 1 shows the relation between the occurence of the internal cracks and the amount (I) of cooling water per unit weight (kg) of the molten steel, and also shows the relation with the cooling cracks.
  • FIG. 2 shows the corelation among the internal cracks, magnetic properties and blisters in case of production of grain-oriented electrical steel sheet of 0.30 mm thickness by casting molten steel containing about 3 percent Si by a continuous casting machine and treating the slab by a conventional method.
  • the estimation of the internal cracks is based on the following standards.
  • FIG. 1 it is possible to completely eliminate the occurrence of internal crack by maintaining the amount of cooling water not less than 1.6 l/kg in the cooling step of the continuous casting, and thereby as seen in FIG. 2 it is possible to obtain a high level of magnetic'properties stably and to prevent effectively the blister occurrence.
  • the B value and W 11,50 value are stable at a high level and yet the blister occurrence is completely prevented in the present invention.
  • the present invention has a remarkable industrial advantage that a grain-oriented electrical steel sheet having an excellent quality stable at a high level inspite of an avoidable loosing of equipments in a continuous operation of a continuous casting machine on a commercial scale.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
US492867A 1973-07-31 1974-07-29 Method for producing grain-oriented electrical steel sheet utilizing a continuous casting process Expired - Lifetime US3908737A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48086249A JPS5033926A (enrdf_load_stackoverflow) 1973-07-31 1973-07-31

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US3908737A true US3908737A (en) 1975-09-30

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US492867A Expired - Lifetime US3908737A (en) 1973-07-31 1974-07-29 Method for producing grain-oriented electrical steel sheet utilizing a continuous casting process

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US (1) US3908737A (enrdf_load_stackoverflow)
JP (1) JPS5033926A (enrdf_load_stackoverflow)
BE (1) BE818285A (enrdf_load_stackoverflow)
FR (1) FR2239536A1 (enrdf_load_stackoverflow)
IT (1) IT1019761B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5482107A (en) * 1994-02-04 1996-01-09 Inland Steel Company Continuously cast electrical steel strip
EP1284167A4 (en) * 2001-03-27 2005-11-09 Jfe Steel Corp METHOD OF MANUFACTURING SEAMLESS STEEL TUBE
US20110079329A1 (en) * 2005-10-28 2011-04-07 Robert Bruce Wagstaff Homogenization and heat-treatment of cast metals

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6095836U (ja) * 1983-12-05 1985-06-29 カネソウ株式会社 花壇用縁取り材

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3432369A (en) * 1965-06-09 1969-03-11 Philips Corp Method of making magnetically anisotropic permanent magnets
US3763921A (en) * 1971-03-24 1973-10-09 Dow Chemical Co Direct chill casting method
US3797555A (en) * 1971-09-30 1974-03-19 Noranda Mines Ltd Method for continuous casting of metal strips

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4942211B2 (enrdf_load_stackoverflow) * 1971-10-20 1974-11-13

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3432369A (en) * 1965-06-09 1969-03-11 Philips Corp Method of making magnetically anisotropic permanent magnets
US3763921A (en) * 1971-03-24 1973-10-09 Dow Chemical Co Direct chill casting method
US3797555A (en) * 1971-09-30 1974-03-19 Noranda Mines Ltd Method for continuous casting of metal strips

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5482107A (en) * 1994-02-04 1996-01-09 Inland Steel Company Continuously cast electrical steel strip
EP1284167A4 (en) * 2001-03-27 2005-11-09 Jfe Steel Corp METHOD OF MANUFACTURING SEAMLESS STEEL TUBE
US20110079329A1 (en) * 2005-10-28 2011-04-07 Robert Bruce Wagstaff Homogenization and heat-treatment of cast metals
US8458887B2 (en) * 2005-10-28 2013-06-11 Novelis Inc. Homogenization and heat-treatment of cast metals
US9073115B2 (en) 2005-10-28 2015-07-07 Novelis Inc. Homogenization and heat-treatment of cast metals
US9802245B2 (en) 2005-10-28 2017-10-31 Novelis Inc. Homogenization and heat-treatment of cast metals

Also Published As

Publication number Publication date
IT1019761B (it) 1977-11-30
JPS5033926A (enrdf_load_stackoverflow) 1975-04-02
FR2239536A1 (enrdf_load_stackoverflow) 1975-02-28
BE818285A (fr) 1974-11-18

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