US3929522A - Process involving cooling in a static atmosphere for high permeability silicon steel comprising copper - Google Patents

Process involving cooling in a static atmosphere for high permeability silicon steel comprising copper Download PDF

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Publication number
US3929522A
US3929522A US524846A US52484674A US3929522A US 3929522 A US3929522 A US 3929522A US 524846 A US524846 A US 524846A US 52484674 A US52484674 A US 52484674A US 3929522 A US3929522 A US 3929522A
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US
United States
Prior art keywords
steel
temperature
cooled
improvement according
temperature below
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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
US524846A
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English (en)
Inventor
James A Salsgiver
Frank A Malagari
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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Allegheny Ludlum Industries Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Allegheny Ludlum Industries Inc filed Critical Allegheny Ludlum Industries Inc
Priority to US524846A priority Critical patent/US3929522A/en
Priority to CA235,675A priority patent/CA1041879A/en
Priority to AU84998/75A priority patent/AU489123B2/en
Priority to GB38765/75A priority patent/GB1478739A/en
Priority to IT51715/75A priority patent/IT1047747B/it
Priority to ES441705A priority patent/ES441705A1/es
Priority to FR7532699A priority patent/FR2291276A1/fr
Priority to BE2054634A priority patent/BE834876A/xx
Priority to IN2080/CAL/1975A priority patent/IN143003B/en
Priority to DE19752550426 priority patent/DE2550426A1/de
Priority to JP50136784A priority patent/JPS5843444B2/ja
Priority to ZA757207A priority patent/ZA757207B/xx
Priority to YU02913/75A priority patent/YU291375A/xx
Priority to SE7512968A priority patent/SE414949B/xx
Priority to PL1975184805A priority patent/PL106073B1/pl
Priority to AR261250A priority patent/AR208730A1/es
Application granted granted Critical
Publication of US3929522A publication Critical patent/US3929522A/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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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
    • 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
    • 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
    • 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
    • C21D8/1261—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 following hot rolling

Definitions

  • ABSTRACT A process for producing silicon steel having a cubeon-edge orientation and a permeability of at least 1850 (G/Oe) at 10 oersteds, which includes the steps of: preparing a melt of steel consisting essentially of,
  • the present invention relates to a process for producing electromagnetic silicon steel having a cube-on-edge orientation and a permeability of at least 1850 (G/O at oersteds.
  • Oriented silicon steels containing 2.60 to 4.0% silicon are generally produced by processes which involve hot rolling, a double cold reduction, an anneal before each cold roll and a high temperature texture anneal. Characterizing these steels are permeabilities at 10 oersteds of from about 1790 to 1840 (G/O).
  • G/O permeabilities at 10 oersteds of from about 1790 to 1840
  • a number of patents have disclosed methods for producing silicon steels with permeabilities in excess of 1850 (G/O at 10 oersteds.
  • 3,287,183, 3,632,456 and 3,636,579 appear to be the most interesting.
  • a still more interest ing method is, however, described in a copending United States patent application. The application is No.
  • Described herein is another, and improved method for producing silicon steel having a cube-on-edge orientation and a permeability of at least 1850 (6/0,) at 10 oersteds. It is primarily based upon the discovery that the melts of application Ser. No. 357,974 and another application filed concurrently herewith, can be prepared with boron added thereto. Boron has been successfully used to help develop high permeability in grain oriented silicon steels. The concurrently filed application is US. Ser. No. 524,831. It is primarily.
  • melt of application Ser. No. 357,974 can be prepared with selenium replacing part or all of the sulfur contained therein.
  • the present invention provides a method for producing silicon steel havinga cube-on-edge orientation and a permeability of at least 1850 (G/O at 10 oersteds.
  • Involved therein are the steps of: preparing a melt of silicon steel consisting essentially of, by weight, up to 0.07% carbon, from 2.60 to 4.0% silicon, from 0.03% to 0.24% manganese, from 0.01 to 0.09% of material from the group consisting of sulfur and selenium, from 2 0.015 to 0.04% aluminum, up to 0.02% nitrogen, from 0.1 to 0.5% copper, from 0.00045 to 0.0035% boron, balance iron; casting the steel; hot rolling the steel into a hot rolled band; subjecting the steel to at least one cold rolling; subjecting the steel to a final annealing prior to the final cold rolling; decarburizing the steel; and final texture annealing the steel.
  • Preferred conditions include annealing at a temperature of from l800 to 2125F,
  • the steel melt must include silicon, aluminum, manganese, and sulfur and/or selenium. Silicon is necessary as it increases the steels resistivity, decreases its magnetostriction, decreases its magnetocrystalline anisotropy and hence decreases its core loss. Aluminum, manganese, and sulfur and/or selenium are necessary as they form inhibitors which are essential for controlling the steels orientation and "its properties which are dependent thereon.
  • aluminum combines with nitrogen in the steel or from the atmosphere, to form aluminum nitride; and manganese combines with sulfur and/or selenium, and possibly copper, to form manganese sulfide and/or manganese copper sulfide, and/or manganese selenide and/or manganese copper selenide. All together, these compounds inhibit normal grain growth during the final texture anneal, while at the same time aiding in the development of secondary recrystallized grains having the desired cube-on-edge orientation. Copper, noted above for its presence in manganese inhibitors, can also be beneficial during processing. It is hypothesized that copper can lower the annealing temperature, lower the temperature from which the rapid cool can occur, improve rollability, simplify melting, and relax annealing atmosphere requirements. Moreover, copper increases the steels resistivity and decreases its core loss.
  • a steel in which the process of the present invention is particularly adaptable to consists essentially of, by weight, from 0.02 to 0.07% carbon, from 2.65 to 3.25% silicon, from 0.05 to 0.20% manganese, from 0.02 to 0.07% of material from the group consisting of sulfur and selenium, from 0.015 to 0.04% aluminum, from 0.0030 to 0.0090% nitrogen, from 0.1 to 0.4% copper,
  • the primary inhibitors are aluminum nitride, and compounds of manganese sulfide and manganese selenide.
  • N criticality is placed upon the particular annealing atmosphere.
  • Illustrative atmospheres therefore include nitrogen; reducing gases such as hydrogen; inert gases such as argon; air; and mixtures thereof.
  • the improvement comprising the steps of carrying out said final anneal prior to the final cold rolling at a temperature of from 1400 to 2l50F for a period of from 15 seconds to 2 hours; cooling said steel from a temperature below 1700F and above 750F to a temperature at least as low as 500F with a liquid quenching medium or gaseous stream and from its maximum annealing temperature to said temperature below 1700F and above 750F at a rate which is no faster than one wherein the steel is cooled in a static atmosphere or in a continuous processing line where there is some relative motion between the atmosphere and the steel, although the only deliberate motion is that imparted to the steel; and cold rolling the cooled steel at a reduction of at least 80%; said melt consisting essentially, of, by weight, up to 0.07% carbon, from 2.60 to 4.0% silicon, from 0.03 to 0.24% manganese,
  • a process for producing electromagnetic silicon steel having a cube-on-edge orientation and a peremeability of at least 1850 (6/0 at 10 oersteds which process includes the steps of: preparing a melt of silicon steel; casting said steel; hot rolling said steel into a hot rolled band; subjecting said steel to at least one cold tic atmosphere or in a continuous processing line where there is some relative motion between the atmosphere and the steel, although the only deliberate motion is that imparted to the steel.
  • said steel consists essentially of, by weight, from 0.02 to 6 0.07% carbon, from 2.65 to 3.25% silicon, from 0.05 to 0.20% manganese, from 0.02 to 0.09% of material from the group consisting of sulfur and selenium, from 0.015 to 0.04% aluminum, from 0.0030 to 0.0090% nitrogen, from 0.1 to 0.4% copper, from 0.0005 to 0.0025% boron, balance iron.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)
US524846A 1974-11-18 1974-11-18 Process involving cooling in a static atmosphere for high permeability silicon steel comprising copper Expired - Lifetime US3929522A (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
US524846A US3929522A (en) 1974-11-18 1974-11-18 Process involving cooling in a static atmosphere for high permeability silicon steel comprising copper
CA235,675A CA1041879A (en) 1974-11-18 1975-09-17 Processing for high permeability silicon steel
AU84998/75A AU489123B2 (en) 1974-11-18 1975-09-19 Processing for high permeability silicon steel
GB38765/75A GB1478739A (en) 1974-11-18 1975-09-22 Processing for high permeability silicon steel
IT51715/75A IT1047747B (it) 1974-11-18 1975-10-09 Perfezionamento nei procedimenti per la produzione di acciai al silicio ad elevata permeabilita magnetica
ES441705A ES441705A1 (es) 1974-11-18 1975-10-10 Procedimiento perfeccionado de produccion de acero silicico elecmagnetico de elevada permeabilidad.
FR7532699A FR2291276A1 (fr) 1974-11-18 1975-10-24 Traitement pour l'obtention d'aciers au silicium a grande permeabilite
BE2054634A BE834876A (fr) 1974-11-18 1975-10-27 Traitement pour l'obtention d'aciers au silicuim a grande permeabilite
IN2080/CAL/1975A IN143003B (it) 1974-11-18 1975-10-29
DE19752550426 DE2550426A1 (de) 1974-11-18 1975-11-10 Verfahren zur herstellung von siliciumstaehlen mit hoher permeabilitaet
JP50136784A JPS5843444B2 (ja) 1974-11-18 1975-11-13 電磁珪素鋼の製造方法
ZA757207A ZA757207B (en) 1974-11-18 1975-11-17 Process for producing electromagnetic silicon steel
YU02913/75A YU291375A (en) 1974-11-18 1975-11-17 Process for producing electro-magnetic silicon steel
SE7512968A SE414949B (sv) 1974-11-18 1975-11-18 Forfarande for framstellning av elektromagnetkiselstal med kub-pa-kantorientering
PL1975184805A PL106073B1 (pl) 1974-11-18 1975-11-18 Sposob wytwarzania stali krzemowej o teksturze gossa
AR261250A AR208730A1 (es) 1974-11-18 1975-11-18 Procedimiento para producir acero de silicio electromagnetico

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US524846A US3929522A (en) 1974-11-18 1974-11-18 Process involving cooling in a static atmosphere for high permeability silicon steel comprising copper

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US3929522A true US3929522A (en) 1975-12-30

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US524846A Expired - Lifetime US3929522A (en) 1974-11-18 1974-11-18 Process involving cooling in a static atmosphere for high permeability silicon steel comprising copper

Country Status (14)

Country Link
US (1) US3929522A (it)
JP (1) JPS5843444B2 (it)
AR (1) AR208730A1 (it)
BE (1) BE834876A (it)
CA (1) CA1041879A (it)
DE (1) DE2550426A1 (it)
ES (1) ES441705A1 (it)
FR (1) FR2291276A1 (it)
GB (1) GB1478739A (it)
IN (1) IN143003B (it)
IT (1) IT1047747B (it)
PL (1) PL106073B1 (it)
SE (1) SE414949B (it)
YU (1) YU291375A (it)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2355082A1 (fr) * 1976-06-17 1978-01-13 Allegheny Ludlum Ind Inc Acier au silicium a teneur commandee en cuivre et procede pour le produire
US4113529A (en) * 1977-09-29 1978-09-12 General Electric Company Method of producing silicon-iron sheet material with copper as a partial substitute for sulfur, and product
US4174235A (en) * 1978-01-09 1979-11-13 General Electric Company Product and method of producing silicon-iron sheet material employing antimony
US4177091A (en) * 1978-08-16 1979-12-04 General Electric Company Method of producing silicon-iron sheet material, and product
US4244754A (en) * 1975-07-05 1981-01-13 The Foundation: The Research Institute Of Electric And Magnetic Alloys Process for producing high damping capacity alloy and product
US4581080A (en) * 1981-03-04 1986-04-08 Hitachi Metals, Ltd. Magnetic head alloy material and method of producing the same
US4753692A (en) * 1981-08-05 1988-06-28 Nippon Steel Corporation Grain-oriented electromagnetic steel sheet and process for producing the same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01159859U (it) * 1988-04-28 1989-11-06
US5078808A (en) † 1990-07-09 1992-01-07 Armco Inc. Method of making regular grain oriented silicon steel without a hot band anneal
DE69128624T3 (de) † 1991-10-21 2002-05-29 Armco Inc., Middletown Verfahren zum Herstellen von normal kornorientiertem Stahl mit hohem Silizium- und niedrigem Kohlenstoffgehalt

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3287184A (en) * 1963-10-22 1966-11-22 Bethlehem Steel Corp Method of producing low carbon electrical sheet steel
US3632456A (en) * 1968-04-27 1972-01-04 Nippon Steel Corp Method for producing an electromagnetic steel sheet of a thin sheet thickness having a high-magnetic induction
US3671337A (en) * 1969-02-21 1972-06-20 Nippon Steel Corp Process for producing grain oriented electromagnetic steel sheets having excellent magnetic characteristics
US3764406A (en) * 1971-11-04 1973-10-09 Armco Steel Corp Hot working method of producing cubeon edge oriented silicon iron from cast slabs
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
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
US3855021A (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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873381A (en) * 1973-03-01 1975-03-25 Armco Steel Corp High permeability cube-on-edge oriented silicon steel and method of making it
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

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3287184A (en) * 1963-10-22 1966-11-22 Bethlehem Steel Corp Method of producing low carbon electrical sheet steel
US3632456A (en) * 1968-04-27 1972-01-04 Nippon Steel Corp Method for producing an electromagnetic steel sheet of a thin sheet thickness having a high-magnetic induction
US3671337A (en) * 1969-02-21 1972-06-20 Nippon Steel Corp Process for producing grain oriented electromagnetic steel sheets having excellent magnetic characteristics
US3764406A (en) * 1971-11-04 1973-10-09 Armco Steel Corp Hot working method of producing cubeon edge oriented silicon iron from cast slabs
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
US3855018A (en) * 1972-09-28 1974-12-17 Allegheny Ludlum Ind Inc Method for producing grain oriented silicon steel comprising copper
US3855018B1 (it) * 1972-09-28 1994-02-18 Allegheny Ludlum Corp.
US3855019A (en) * 1973-05-07 1974-12-17 Allegheny Ludlum Ind Inc Processing for high permeability silicon steel comprising copper
US3855021A (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

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244754A (en) * 1975-07-05 1981-01-13 The Foundation: The Research Institute Of Electric And Magnetic Alloys Process for producing high damping capacity alloy and product
FR2355082A1 (fr) * 1976-06-17 1978-01-13 Allegheny Ludlum Ind Inc Acier au silicium a teneur commandee en cuivre et procede pour le produire
US4113529A (en) * 1977-09-29 1978-09-12 General Electric Company Method of producing silicon-iron sheet material with copper as a partial substitute for sulfur, and product
US4174235A (en) * 1978-01-09 1979-11-13 General Electric Company Product and method of producing silicon-iron sheet material employing antimony
US4177091A (en) * 1978-08-16 1979-12-04 General Electric Company Method of producing silicon-iron sheet material, and product
US4581080A (en) * 1981-03-04 1986-04-08 Hitachi Metals, Ltd. Magnetic head alloy material and method of producing the same
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

Also Published As

Publication number Publication date
FR2291276B1 (it) 1981-08-28
SE7512968L (sv) 1976-05-19
JPS5843444B2 (ja) 1983-09-27
DE2550426A1 (de) 1976-05-20
BE834876A (fr) 1976-02-16
YU291375A (en) 1982-02-28
AR208730A1 (es) 1977-02-28
DE2550426C2 (it) 1987-12-23
GB1478739A (en) 1977-07-06
IT1047747B (it) 1980-10-20
PL106073B1 (pl) 1979-11-30
FR2291276A1 (fr) 1976-06-11
IN143003B (it) 1977-09-17
ES441705A1 (es) 1977-04-01
AU8499875A (en) 1977-03-24
CA1041879A (en) 1978-11-07
SE414949B (sv) 1980-08-25
JPS5173922A (it) 1976-06-26

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