US3898108A - Box annealing of steel strip coils - Google Patents

Box annealing of steel strip coils Download PDF

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Publication number
US3898108A
US3898108A US371984A US37198473A US3898108A US 3898108 A US3898108 A US 3898108A US 371984 A US371984 A US 371984A US 37198473 A US37198473 A US 37198473A US 3898108 A US3898108 A US 3898108A
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US
United States
Prior art keywords
coil
steel strip
strip
annealing
projection
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
US371984A
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English (en)
Inventor
Masaru Iwasaki
Isoshi Tokisada
Shinichi Miyamoto
Toshimi Kawabata
Hiroshi Sato
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Nippon Steel Corp
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Nippon Steel Corp
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Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
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Publication of US3898108A publication Critical patent/US3898108A/en
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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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces

Definitions

  • ABSTRACT A box annealing method for a steel strip coil which comprises placing a steel strip coil having a projection on its side edge portion on a base plate of a box annealing furnace, and annealing the coil.
  • the present invention relates to box annealing of steel strip coils for reducing strain caused in the side edge portions of the coil, particularly strain caused in the side edge portion which contacts the annealing furnace base plate.
  • cold-rolled steel sheets are coiled and annealed for releaving strain caused by cold-rolling, and in case of electrical steel sheets, the sheets are coiled and annealed after cold-rolling to the final size for adjustment of the chemical composition, such as, for decarburization and denitrization or grain adjustment.
  • the steel strip coils are piled in the furnace with their coil axis being perpendicular to the furnace base plate and annealed.
  • the coils box-annealed in this way are susceptible to strain caused in their side edge portions which contact the furnace base plate, and such strain in the side edge portions of the annealed coils cause significant problems if the sheets from such coils are used in a piled state, as in case of an electrical steel sheet.
  • the object of the present invention is to provide a box annealing method which can minimize the strain affected zone in the side edge portions of the steel strip.
  • Another object of the present invention is to provide a box annealing method which reduces strain in the side edge portions caused when a cold rolled steel sheet, particularly an electrical steel strip coil is annealed.
  • the present invention has its feature in that the steel sheet rolled in a strip form is coiled in such a manner that the side edge portions form projections and recessions and then the coil is placed on the base plate of the box annealing furnace with the projected edge portions of the coil facing to the base plate side, and the coil is annealed with a de sired heating cycle.
  • FIG. 1 is a cross-sectional view showing the box annealing of a steel strip coil
  • FIG. 2 (a) (b) and (c) are cross-sectional views of steel strip coils according to the present invention.
  • any of ordinary steel, special steel and electrical steel can be treated by the present invention, but the present invention is particularly suitable for annealing electrical steel strip coil, which is box-annealed after it has been rolled to its final size.
  • Steel strip which does not need subsequent shape correction, such as, temper rolling can be obtained.
  • shape correction including the temper rolling
  • the present invention is remarkably advantageous for preventing lowering of the commercial value of the product.
  • the steel strip to be treated by the present invention is rolled to the final size by any known means. Then the steel strip is coiled while the strip is swung left and right so that the side edge portions of the coiled strip form projections and recessions.
  • the first half of the steel strip may be coiled so as to form the projection 2 and the latter half of the strip may be coiled so as to form the recession 3 as shown in FIG.2(a).
  • the strip is coiled in such a manner that the recession 4 and the projection 5 appear alternatively with a constant cycle through the whole course of the ceiling, but the recession 4 and the projection S are formed with the same number of coilings or with different numbers of coilings.
  • the projection 2 or 5 serves as a support for the coil on the base plate 7. Then the coil is annealed with a desired heating cycle.
  • the material to be annealed namely a steel strip coil and the base plate 7 of the annealing furnace expand or contract depending on the changes in the heat treatment temperature, and generally their expansions or contractions do not completely coincide.
  • the lower side of the strip coil namely the side contacting the base plate 7 is strained due to the perpendicular load by its own weight and the horizontal load by the abrasion, and thus is very susceptible to plastic deformation at high temperatures.
  • the horizontal force imposed on the side edge portion of the coil due to the expansion or contraction caused by the change in the annealing temperature can be limited only in the projection and prevented from expanding inside the projection or to nonprojected portions.
  • EXAMPLE I A grain-oriented electrical steel strip which had been rolled to its final size was coiled in such a manner that the first half of the strip is coiled with the normal position and the latter half was coiled by displacing the strip to one side, and the thus obtained coil was placed in the furnace with the inside projections contacting the base plate 7 as shown by FIG. 2(a), and box-annealed at l C.
  • EXAMPLE 3 Grain-oriented electrical steel strip which had been cold rolled to its final size was coiled while the strip was swung left and right each 20 coilings, and the thus obtained coil was placed on the base plate 7 of the box an nealing furnace as shown by FIG. 2(c) and annealed at 50C. The results show the strain formation was remarkably reduced as shown in Table 1.
  • a method for box annealing a steel strip coil and for decreasing the strains resulting in the sheet from non-uniform annealing which comprises forming a coil of a steel strip such that at least one edge of the coil has a projection thereon which is parallel to the winding axis of the coil and is disposed about the circumference of the coil to provide a stable support for the coil when placed on the edge having the projection by swinging the steel strip left and right during coiling; placing the coil on a base plate of a box annealing furnace such that each coil rests on the projection. and annealing the

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (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)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
US371984A 1972-06-23 1973-06-21 Box annealing of steel strip coils Expired - Lifetime US3898108A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47062360A JPS5213169B2 (el) 1972-06-23 1972-06-23

Publications (1)

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US3898108A true US3898108A (en) 1975-08-05

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US371984A Expired - Lifetime US3898108A (en) 1972-06-23 1973-06-21 Box annealing of steel strip coils

Country Status (7)

Country Link
US (1) US3898108A (el)
JP (1) JPS5213169B2 (el)
BE (1) BE801284A (el)
DE (1) DE2331716C3 (el)
FR (1) FR2189520B1 (el)
GB (1) GB1425752A (el)
IT (1) IT989381B (el)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131417A (en) * 1977-06-15 1978-12-26 Aluminum Company Of America Carbon electrode production
US4427396A (en) 1981-02-16 1984-01-24 U.S. Philips Corporation Method of manufacturing a color selection electrode for a color display tube

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5527515U (el) * 1978-08-09 1980-02-22
JPS5914522B2 (ja) * 1979-05-24 1984-04-05 新日本製鐵株式会社 鋼帯コイルのボツクス焼鈍方法
JPS57101000A (en) * 1980-12-12 1982-06-23 Sumitomo Electric Ind Ltd Preparation of ceramic whisker
JPS57111300A (en) * 1980-12-25 1982-07-10 Sumitomo Electric Ind Ltd Preparation of ceramic whisker
JPS61295299A (ja) * 1985-06-21 1986-12-26 Kobe Steel Ltd 炭化ケイ素ウイスカ−の製造方法
JPS623098A (ja) * 1985-06-21 1987-01-09 Kobe Steel Ltd 炭化ケイ素ウイスカ−の製造方法
JPH0717369B2 (ja) * 1987-10-20 1995-03-01 工業技術院長 繊維状珪素・酸素・炭素系化合物の製造方法
JPH02217400A (ja) * 1989-02-16 1990-08-30 Ofic Co 炭化ケイ素ウイスカーの製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677538A (en) * 1950-11-09 1954-05-04 Asea Ab Method and apparatus for preventing piled sheet iron from sintering together during annealing
US2769630A (en) * 1954-03-19 1956-11-06 John D Keller Method for annealing tightly wound flat rolled metal stock
US3086729A (en) * 1960-06-29 1963-04-23 Nat Steel Corp Coiling apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677538A (en) * 1950-11-09 1954-05-04 Asea Ab Method and apparatus for preventing piled sheet iron from sintering together during annealing
US2769630A (en) * 1954-03-19 1956-11-06 John D Keller Method for annealing tightly wound flat rolled metal stock
US3086729A (en) * 1960-06-29 1963-04-23 Nat Steel Corp Coiling apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131417A (en) * 1977-06-15 1978-12-26 Aluminum Company Of America Carbon electrode production
US4427396A (en) 1981-02-16 1984-01-24 U.S. Philips Corporation Method of manufacturing a color selection electrode for a color display tube

Also Published As

Publication number Publication date
GB1425752A (en) 1976-02-18
JPS5213169B2 (el) 1977-04-12
BE801284A (fr) 1973-10-15
DE2331716B2 (de) 1975-03-06
DE2331716A1 (de) 1974-01-10
FR2189520A1 (el) 1974-01-25
DE2331716C3 (de) 1975-10-09
JPS4922320A (el) 1974-02-27
FR2189520B1 (el) 1975-08-22
IT989381B (it) 1975-05-20

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