US3843422A - Rolling method for producing silicon steel strip - Google Patents

Rolling method for producing silicon steel strip Download PDF

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Publication number
US3843422A
US3843422A US00239538A US23953872A US3843422A US 3843422 A US3843422 A US 3843422A US 00239538 A US00239538 A US 00239538A US 23953872 A US23953872 A US 23953872A US 3843422 A US3843422 A US 3843422A
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US
United States
Prior art keywords
temperature
strip
slabs
rolling
silicon steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00239538A
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English (en)
Inventor
R Henke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Allegheny Ludlum Corp
Pittsburgh National Bank
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US00239538A priority Critical patent/US3843422A/en
Priority to CA166,777A priority patent/CA973737A/en
Priority to SE7304465A priority patent/SE412602B/xx
Priority to FR7311399A priority patent/FR2186536B1/fr
Priority to AT276273A priority patent/AT343157B/de
Priority to NO129673A priority patent/NO135995C/no
Priority to DE2315703A priority patent/DE2315703C3/de
Priority to BE129481A priority patent/BE797578A/xx
Priority to ES413185A priority patent/ES413185A1/es
Priority to GB1551973A priority patent/GB1408827A/en
Priority to JP48035860A priority patent/JPS514020A/ja
Priority to IT4914573A priority patent/IT980063B/it
Priority to US05/493,531 priority patent/US3969162A/en
Publication of US3843422A publication Critical patent/US3843422A/en
Application granted granted Critical
Priority to US06/041,341 priority patent/US4231818A/en
Assigned to ALLEGHENY LUDLUM CORPORATION reassignment ALLEGHENY LUDLUM CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). 8-4-86 Assignors: ALLEGHENY LUDLUM STEEL CORPORATION
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLEGHENY LUDLUM CORPORATION
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK ASSIGNMENT OF ASSIGNORS INTEREST. RECORDED ON REEL 4855 FRAME 0400 Assignors: PITTSBURGH NATIONAL BANK
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/18—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for step-by-step or planetary rolling; pendulum mills
    • B21B13/20—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for step-by-step or planetary rolling; pendulum mills for planetary rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless 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
    • C21D8/1216—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
    • C21D8/1222—Hot 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
    • C21D8/1216—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
    • C21D8/1227—Warm rolling

Definitions

  • a method of producing silicon steel strip from slabs includes the steps of reducing the slabs in a planetary mill to a thickness of 0.060 to 0.15 inch at a temperature above that at which MnS will precipitate, cooling to between 300 F. to 1500 F. and reducing the strip at that temperature to a thickness of 0.020 to 0.030.
  • This invention relates to methods of producing silicon steel strip and particularly to a method of producing silicon steel strip having a high degree of preferred orientation and highly directional magnetic properties.
  • the metal cools and loses temperature because of radiation heat losses, cooling Water from various mill stands, and physical contact with the rolling mill rolls and the transfer table rolls. This temperature loss is not uniform, the ends cool more than areas away from the ends and the time delay (65 seconds) of the front end entering the first finishing stand versus the back or last end to enter results in additional radiation, conduction and convection loses.
  • These variations in temice perature between slab locations are very important in that they determine when in the process MnS and other constituents will precipitate from solution. It is obvious to the informed that a non-uniformity of precipitate will result under these conditions.
  • the temperature variation between the hottest and coldest part of a given slab entering the first finishing stand can be as high as 200 F. and more commonly is F. Temperature variations between slabs is often as high as 300 F. when measured at the same relative location. These temperature variations are reflected in the finished product when the magnetic properties are measured.
  • the ends of the coil usually have poorer magnetic properties than the center of the coil, and the last end into #1 finishing mill is poorer than the first or front end (See Crede et a1. Pat. 2,867,557).
  • a practice incorporating a planetary form of mill such as the so called Zendzimer mill or the Krupp-Platzer mill.
  • I form the silicon steel into slabs heat the slabs to temperature required for solution of the MnS ratio, descale, reduce the slabs in a planetary mill with an exit temperature in the range of 2100 F. to
  • the product can be markedly improved by substituting a warm rolling cycle at 1500 300 F. and preferably in the range IZOD-600 to reduce the strip thickness to the range 0.020 to 0.030 inch and preferably about 0.026 inch rather than a cold or ambient temperature rolling as is commonly used for the finishing roll prior to recrystallize normalizing.
  • silicon steels are made by a variety of hot mill practices. Following the hot mill, the practices are fairly consistent in all cases and usually comprise the following steps:
  • This process produces magnetic properties which are classified and sold in the trade according to industry standards. It is the desire of all manufacturers to make the lowest Watt loss for a given flux density and the highest permeability when measured at H.
  • the combination of hot planetary mill for hot rolling oriented silicon steel and warm rolling as described above provides a marked improvement in uniformity of product while providing a greater scope of silicon analysis which may be used.
  • the two practices may be combined by taking the product from the hot mill and instead of coiling the 0.080" strip, run it through several successive 4 high mills after cooling to about 1500 F. prior to entry and reducing the gauge to intermediate gauge (0.026") and then cool.
  • Oriented silicon steels today have a nominal composition as follows: .032" carbon, .080" Mn, .028 S, .007 P, 2.90/ 3.40 Si, +minor residuals.
  • the patent literature discusses compositions for Si in these steels as being in the range of 2.5 to 4.0% Si.
  • the Si content is limited to about 3.50% max. because of brittleness developing which creates processing hazards with respect to coil breakage.
  • This brittleness which is associated with the hot roll thickness, can be overcome by warming the 'hot roll coil to about 250 F. before beginning the process. After it is reduced to intermediate gauge (0.026) the brittleness is no longer apparent.
  • the silicon content is increased, it requires higher temperatures to overcome the brittleness. Warm rolling after reduction on the planetary mill, in the manner previously described, would allow these steels to be economically manufactured and a new family of oriented silicon steels of higher Si content (up to 6%) could be developed.
  • FIG. 1 is a schematic flow sheet incorporating the method of my invention.
  • FIG. 2 is a top plan view of a mill incorporating the features of my invention.
  • FIG. 1 I have illustrated an electric furnace 10 for melting the steel, followed by an oxygen vessel 11 for rapid refinement of the steel.
  • the oxygen vessel may be one of the forms now known in the trade as BOF or Q-BOP.
  • the product of the oxygen vessel is fed to a continuous casting assembly 12 which produces slabs which go to continuous furnace 13. It is of course obvious that any other equivalent means for producing the steel such as open hearth may be used and any other means for producing slabs and introducing them to the furnace 13 might be used.
  • the heated slabs from the continuous furnace 13 are delivered to a planetary mill 14 where the heated slab is quickly reduced to about 0.080 inches in thickness, generally in less than ten seconds.
  • the hot strip leaving the planetary mill is cooled and cleaned in cleaning unit 15 and delivered to warm rolling mill 16 in the form of a 4 high mill in the temperature range 300 F. to 1500" F. where it is reduced to about 0.026 inches in thickness and coiled on coiler 17.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
  • Metal Rolling (AREA)
US00239538A 1972-03-30 1972-03-30 Rolling method for producing silicon steel strip Expired - Lifetime US3843422A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
US00239538A US3843422A (en) 1972-03-30 1972-03-30 Rolling method for producing silicon steel strip
CA166,777A CA973737A (en) 1972-03-30 1973-03-22 Methods of producing silicon steel strip
FR7311399A FR2186536B1 (de) 1972-03-30 1973-03-29
AT276273A AT343157B (de) 1972-03-30 1973-03-29 Verfahren zur herstellung von fe-si-bandmaterial
NO129673A NO135995C (de) 1972-03-30 1973-03-29
DE2315703A DE2315703C3 (de) 1972-03-30 1973-03-29 Verfahren zum Herstellen von Elektroband aus orientiertem Siliciumstahl
SE7304465A SE412602B (sv) 1972-03-30 1973-03-29 Sett att framstella kiselstalband
IT4914573A IT980063B (it) 1972-03-30 1973-03-30 Procedimento per la produzione di acciaio al silicio in nastri
BE129481A BE797578A (fr) 1972-03-30 1973-03-30 Procedes de fabrication de feuillards d'acier au silicium
ES413185A ES413185A1 (es) 1972-03-30 1973-03-30 Procedimiento para la produccion de bandas de acero al si- licio a partir de zamarras.
GB1551973A GB1408827A (en) 1972-03-30 1973-03-30 Methods of produciang silicon steel strip
JP48035860A JPS514020A (en) 1972-03-30 1973-03-30 Keisokosutoritsupuo seizosuru hoho
US05/493,531 US3969162A (en) 1972-03-30 1974-08-01 Method of producing silicon steel strip
US06/041,341 US4231818A (en) 1972-03-30 1979-05-22 Methods of producing silicon steel strip

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US00239538A US3843422A (en) 1972-03-30 1972-03-30 Rolling method for producing silicon steel strip
US05/493,531 US3969162A (en) 1972-03-30 1974-08-01 Method of producing silicon steel strip

Related Child Applications (1)

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US05/493,531 Division US3969162A (en) 1972-03-30 1974-08-01 Method of producing silicon steel strip

Publications (1)

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US3843422A true US3843422A (en) 1974-10-22

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US00239538A Expired - Lifetime US3843422A (en) 1972-03-30 1972-03-30 Rolling method for producing silicon steel strip
US05/493,531 Expired - Lifetime US3969162A (en) 1972-03-30 1974-08-01 Method of producing silicon steel strip

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US05/493,531 Expired - Lifetime US3969162A (en) 1972-03-30 1974-08-01 Method of producing silicon steel strip

Country Status (9)

Country Link
US (2) US3843422A (de)
JP (1) JPS514020A (de)
AT (1) AT343157B (de)
BE (1) BE797578A (de)
CA (1) CA973737A (de)
DE (1) DE2315703C3 (de)
FR (1) FR2186536B1 (de)
GB (1) GB1408827A (de)
SE (1) SE412602B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933024A (en) * 1973-06-18 1976-01-20 Nippon Steel Corporation Method for cold rolling of a high magnetic flux density grain-oriented electrical steel sheet or strip having excellent properties
US3969162A (en) * 1972-03-30 1976-07-13 Henke Robert H Method of producing silicon steel strip
US4231818A (en) * 1972-03-30 1980-11-04 Allegheny Ludlum Industries, Inc. Methods of producing silicon steel strip
US4291558A (en) * 1979-07-27 1981-09-29 Allegheny Ludlum Steel Corporation Process of rolling iron-silicon strip material
US4478653A (en) * 1983-03-10 1984-10-23 Armco Inc. Process for producing grain-oriented silicon steel
US4563226A (en) * 1981-11-16 1986-01-07 Nippon Steel Corporation Process for producing a grain-oriented electrical steel sheet
US5288736A (en) * 1992-11-12 1994-02-22 Armco Inc. Method for producing regular grain oriented electrical steel using a single stage cold reduction
US5421911A (en) * 1993-11-22 1995-06-06 Armco Inc. Regular grain oriented electrical steel production process
US6086242A (en) * 1998-02-27 2000-07-11 University Of Utah Dual drive planetary mill

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2373609A1 (fr) * 1976-12-10 1978-07-07 Nippon Steel Corp Procede de fabrication de toles magnetiques d'acier a grains orientes utilisant la coulee continue
US4204891A (en) * 1978-11-27 1980-05-27 Nippon Steel Corporation Method for preventing the edge crack in a grain oriented silicon steel sheet produced from a continuously cast steel slab
US4278705A (en) * 1979-11-08 1981-07-14 Bell Telephone Laboratories, Incorporated Sequentially annealed oxidation of silicon to fill trenches with silicon dioxide
NL8702050A (nl) * 1987-09-01 1989-04-03 Hoogovens Groep Bv Werkwijze en inrichting voor de vervaardiging van bandvormig vervormingsstaal met goede mechanische en oppervlakte-eigenschappen.
NL8802892A (nl) * 1988-11-24 1990-06-18 Hoogovens Groep Bv Werkwijze voor het vervaardigen van vervormingsstaal en band vervaardigd daarmee.
JPH055495U (ja) * 1991-07-05 1993-01-26 浩一 新谷 マーカーとフオークと鉛筆を一体化したゴルフ用筆記具
US6858095B2 (en) 1992-09-04 2005-02-22 Nippon Steel Corporation Thick grain-oriented electrical steel sheet exhibiting excellent magnetic properties
GB2302054B (en) * 1995-06-01 1998-10-21 Ralph Gladwin Haynes Production of metal strip
DE102020130988A1 (de) 2020-03-17 2021-09-23 Schaeffler Technologies AG & Co. KG Verfahren zur Herstellung einer Schichtanordnung aus Elektroblech, danach hergestellte Schichtanordnung, Rotor oder Stator sowie Elektromotor

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2084336A (en) * 1934-06-30 1937-06-22 Allegheny Steel Co Magnetic material and method of manufacture
US2084337A (en) * 1934-12-01 1937-06-22 Allegheny Steel Co Method of rolling magnetic material
BE572663A (de) * 1957-11-06
US3144363A (en) * 1961-12-14 1964-08-11 Westinghouse Electric Corp Process for producing oriented silicon steel and the product thereof
GB1086215A (en) * 1963-11-13 1967-10-04 English Electric Co Ltd Grain-oriented silicon-iron alloy sheet
FR1414282A (fr) * 1963-11-13 1965-10-15 English Electric Co Ltd Tôles en fer-silicium et procédé de fabrication
DE2024525B1 (de) * 1970-05-11 1971-12-30 Mannesmann Ag Verfahren zur Herstellung von für eine Kaltbearbeitung ausreichend duktilen Zwischenprodukten aus Eisen-Silizium-Legierungen mit 4,5 bis 7,5 Gew.-% Silizium
BE790798A (fr) * 1971-11-04 1973-02-15 Armco Steel Corp Procédé de fabrication de fer au silicium à orientation cube-sur-arete à partir de brames coulées
US3843422A (en) * 1972-03-30 1974-10-22 R Henke Rolling method for producing silicon steel strip

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969162A (en) * 1972-03-30 1976-07-13 Henke Robert H Method of producing silicon steel strip
US4231818A (en) * 1972-03-30 1980-11-04 Allegheny Ludlum Industries, Inc. Methods of producing silicon steel strip
US3933024A (en) * 1973-06-18 1976-01-20 Nippon Steel Corporation Method for cold rolling of a high magnetic flux density grain-oriented electrical steel sheet or strip having excellent properties
US4291558A (en) * 1979-07-27 1981-09-29 Allegheny Ludlum Steel Corporation Process of rolling iron-silicon strip material
US4563226A (en) * 1981-11-16 1986-01-07 Nippon Steel Corporation Process for producing a grain-oriented electrical steel sheet
US4478653A (en) * 1983-03-10 1984-10-23 Armco Inc. Process for producing grain-oriented silicon steel
US5288736A (en) * 1992-11-12 1994-02-22 Armco Inc. Method for producing regular grain oriented electrical steel using a single stage cold reduction
US5421911A (en) * 1993-11-22 1995-06-06 Armco Inc. Regular grain oriented electrical steel production process
US6086242A (en) * 1998-02-27 2000-07-11 University Of Utah Dual drive planetary mill

Also Published As

Publication number Publication date
JPS5736968B2 (de) 1982-08-06
ATA276273A (de) 1977-09-15
BE797578A (fr) 1973-07-16
FR2186536B1 (de) 1977-02-04
CA973737A (en) 1975-09-02
DE2315703C3 (de) 1983-01-20
SE412602B (sv) 1980-03-10
GB1408827A (en) 1975-10-08
DE2315703B2 (de) 1976-11-25
AT343157B (de) 1978-05-10
JPS514020A (en) 1976-01-13
US3969162A (en) 1976-07-13
FR2186536A1 (de) 1974-01-11
DE2315703A1 (de) 1973-12-06

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Owner name: ALLEGHENY LUDLUM CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:ALLEGHENY LUDLUM STEEL CORPORATION;REEL/FRAME:004779/0642

Effective date: 19860805

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Owner name: PITTSBURGH NATIONAL BANK

Free format text: SECURITY INTEREST;ASSIGNOR:ALLEGHENY LUDLUM CORPORATION;REEL/FRAME:004855/0400

Effective date: 19861226

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. RECORDED ON REEL 4855 FRAME 0400;ASSIGNOR:PITTSBURGH NATIONAL BANK;REEL/FRAME:005018/0050

Effective date: 19881129