US3752459A - Continuous annealing facilities for drawing steel strip - Google Patents

Continuous annealing facilities for drawing steel strip Download PDF

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Publication number
US3752459A
US3752459A US00098734A US3752459DA US3752459A US 3752459 A US3752459 A US 3752459A US 00098734 A US00098734 A US 00098734A US 3752459D A US3752459D A US 3752459DA US 3752459 A US3752459 A US 3752459A
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US
United States
Prior art keywords
zone
rapid cooling
continuous annealing
strip
cooling chamber
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
US00098734A
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English (en)
Inventor
Y Kawazoko
H Kuroda
K Hirogami
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.)
JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
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Filing date
Publication date
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
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Publication of US3752459A publication Critical patent/US3752459A/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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing
    • 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
    • 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
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling

Definitions

  • a continuous annealing facilities substantially comprising the following devices:
  • This invention relates to a novel continuous annealing apparatus which is particularly useful for obtaining good drawability of steel sheet.
  • This invention is developed to comply with said desires.
  • the features thereof lie in an arrangement in which a rapid cooling chamber and a shelf treating zone are provided between a heating zone and a cooling zone in the ordinary continuous annealing facilities.
  • An object of this invention is to provide a novel and improved continuous annealing apparatus which is particularly useful for obtaining good drawability of steel sheet.
  • Another object of this invention is to provide a novel and improved continuous annealing apparatus having a high productivity which can not bear comparison with the ordinary batch type or open coil annealing furnace for deep-drawing steel sheet.
  • a further object of this invention is to provide a novel and improved continuous annealing apparatus having entirely uniform mechanical properties in which it is possible to make a steel sheet having entirely uniform mechanical properties which is extending over the whole length and width of steel strip. Such a steel could not be made by said batch type or open coil annealing furnace.
  • FIG. 1 is an enlarged vertical sectional view of a portion of the present apparatus facilities shown in, and
  • FIG. 2 is a schematic diagram of a portion of a continuous annealing line, which is this invention.
  • A shows a heating zone; B, a soaking zone; C, a shelf treating zone; and D, a cooling zone.
  • 5 is a rapid cooling chamber.
  • the rapid cooling rate in said chamber 5 should be more than 50 C per second. According to many experiments, it is confirmed that the greater said rapid cooling rate is, the greater is the drawability of the steel.
  • a desireable heating temperature at starting point of said rapid cooling is within the range of 710 C from 800 C. In other words, such a rapid cooling rate as carbide is impossible to be precipitated while cooling is needed.
  • Said shelf treating temperature is 300 to 500 C and shelf treating time is more than seconds.
  • FIG. 1 is an embodiment of said rapid cooling chamber 5 shown in FIG. 2.
  • said chamber 5 water, oils such as light oil, lump oil and sealing oil, low grade alcohol such as ethanol, methanol and propane], refrigerants such as ammonia and freon and liquefied gassuch as liquid nitrogen is possible to be employed as the coolant respectively. Both latent heat and sensible heat of such coolants are high. Accordingly, cooling efficiency is very good. It is needless to say that these cooling agents do not compound with the steel, do not remain on the surface of the steel and are harmless to men.
  • steel strip 1 is passed through from soaking zone 22 to slow cooling zone 18 along an imaginary line 23.
  • a rapid cooling chamber 5 is arranged, and simultaneously said slow cooling zone 18 is controlled to hold at a constant temperature, i.e., 300 to 500 C, for at least ten seconds'.
  • the entry side and delivery side of said rapid cooling chamber 5 should be sealed respectively. That is, sealing portion 7 and seal roll 6 are provided.
  • Steel strip 1 is passed through said chamber 5 by openings 4 and over guide rollers 10. Many groups of spray nozzle 9 are provided on both sides and extend over the whole width of said strip 1.
  • the atmosphere is fed into pipes 19 of slow cooling zone 18 as the slow cooling means.
  • the exhaust gas from said heating zone 22 is fed into said pipe 19 in place of the atmosphere.
  • said shelf treating of steel strip is possible to be carried out with ease. If an existing slow cooling zone is employed as a shelf treating zone, it is enough to divide said zone into two portion, i.e., portions 18 and 21 by screen plate 17. In such a case, zone portion 18 is employed as a shelf treating zone and zone portion 21 is employed as an ordinary slow cooling zone.
  • Numeral 20 shows a feeding pipe of the atmosphere for slow cooling.
  • Numeral 25 is an indicator of the temperature in said shelf treating zone 18.
  • a continuous annealing apparatus comprising a chamber having a heating zone, a soaking zone, a rapid cooling chamber, a shelf treating zone and a cooling zone, and means for moving strip steel from said heating zone to said soaking zone to said rapid cooling chamber to said shelf treating zone and then to said cooling zone for obtaining steel sheet of good drawability, means sealing said rapid cooling chamber from said zones, but permitting the passage of said steel strip, means for introducing a coolant to said rapid cooling chamber, gas absorbing devices connected to said sealing means and coolant recovery means connected to said rapid cooling chamber.

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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)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
US00098734A 1969-12-16 1970-12-16 Continuous annealing facilities for drawing steel strip Expired - Lifetime US3752459A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44100594A JPS4923727B1 (pt) 1969-12-16 1969-12-16

Publications (1)

Publication Number Publication Date
US3752459A true US3752459A (en) 1973-08-14

Family

ID=14278183

Family Applications (1)

Application Number Title Priority Date Filing Date
US00098734A Expired - Lifetime US3752459A (en) 1969-12-16 1970-12-16 Continuous annealing facilities for drawing steel strip

Country Status (6)

Country Link
US (1) US3752459A (pt)
JP (1) JPS4923727B1 (pt)
DE (1) DE2061726C3 (pt)
FR (1) FR2070881B1 (pt)
NL (1) NL164610C (pt)
SE (1) SE364993B (pt)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877684A (en) * 1973-01-11 1975-04-15 Nippon Kokan Kk Continuous annealing furnace
US4358093A (en) * 1979-10-31 1982-11-09 Kawasaki Steel Corporation Steel strip continuous annealing furnace
US4363471A (en) * 1979-10-31 1982-12-14 Kawasaki Steel Corporation Steel strip continuous annealing apparatus
US20090139616A1 (en) * 2005-11-10 2009-06-04 Werner Kaiser Method and Device for the Continuous Creation of a Bainite Structure in a Carbon Steel, Particularly in a Strip Steel

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT946124B (it) * 1970-12-01 1973-05-21 Nippon Steel Corp Apparecchio per il trattamento continuo di lamiera di acciaio
JPS5825733B2 (ja) * 1979-11-27 1983-05-30 新日本製鐵株式会社 塗装性、溶接性及び加工性の良い高強度冷延鋼板の製造方法
US4417720A (en) * 1979-12-12 1983-11-29 Centre De Recherches Metallurgiques Continuous heat treatment plant for steel sheet
CA1152870A (en) * 1979-12-24 1983-08-30 Hiromitsu Naito Process for continuously annealing of a cold rolled steel strip
JPS5767134A (en) * 1980-10-09 1982-04-23 Nippon Steel Corp Method and installation for continuous annealing method of cold-rolled steel strip
JPH0378808A (ja) * 1989-08-22 1991-04-04 Nec Corp 安定化電源回路

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205915A (en) * 1939-02-09 1940-06-25 Wean Engineering Co Inc Method and apparatus for annealing strip
US2585277A (en) * 1946-06-27 1952-02-12 Drever Co Apparatus for annealing strip
US2768916A (en) * 1951-11-13 1956-10-30 Drever Co Continuous bluing system for ferrous strip
US2797177A (en) * 1953-01-14 1957-06-25 John D Keller Method of and apparatus for annealing strip steel
US2890878A (en) * 1956-12-28 1959-06-16 Nat Res Corp Apparatus for annealing in a high vacuum
US2892744A (en) * 1956-07-23 1959-06-30 United States Steel Corp Method and apparatus for the continuous heat-treatment of metal strip
US2991989A (en) * 1958-03-10 1961-07-11 Midland Ross Corp Convection strip heater and control therefor
US3194545A (en) * 1960-03-17 1965-07-13 Kaiser Aluminium Chem Corp Apparatus for continuously solution heat-treating aluminum and its alloys

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205915A (en) * 1939-02-09 1940-06-25 Wean Engineering Co Inc Method and apparatus for annealing strip
US2585277A (en) * 1946-06-27 1952-02-12 Drever Co Apparatus for annealing strip
US2768916A (en) * 1951-11-13 1956-10-30 Drever Co Continuous bluing system for ferrous strip
US2797177A (en) * 1953-01-14 1957-06-25 John D Keller Method of and apparatus for annealing strip steel
US2892744A (en) * 1956-07-23 1959-06-30 United States Steel Corp Method and apparatus for the continuous heat-treatment of metal strip
US2890878A (en) * 1956-12-28 1959-06-16 Nat Res Corp Apparatus for annealing in a high vacuum
US2991989A (en) * 1958-03-10 1961-07-11 Midland Ross Corp Convection strip heater and control therefor
US3194545A (en) * 1960-03-17 1965-07-13 Kaiser Aluminium Chem Corp Apparatus for continuously solution heat-treating aluminum and its alloys

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Blast Furnace And Steel Plant, Sept. 1957. TS300.B6. Pp. 1024 & 1025. *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877684A (en) * 1973-01-11 1975-04-15 Nippon Kokan Kk Continuous annealing furnace
US4358093A (en) * 1979-10-31 1982-11-09 Kawasaki Steel Corporation Steel strip continuous annealing furnace
US4363471A (en) * 1979-10-31 1982-12-14 Kawasaki Steel Corporation Steel strip continuous annealing apparatus
US20090139616A1 (en) * 2005-11-10 2009-06-04 Werner Kaiser Method and Device for the Continuous Creation of a Bainite Structure in a Carbon Steel, Particularly in a Strip Steel
US7972452B2 (en) 2005-11-10 2011-07-05 C.D. Wälzholz GmbH Method and device for the continuous creation of a bainite structure in a carbon steel, particularly in a strip steel
CN101370947B (zh) * 2005-11-10 2011-07-27 C.D.威尔斯霍尔茨有限公司 用于在碳素钢内尤其是在带钢内连续生成贝氏体组织的方法和设备
US20110198786A1 (en) * 2005-11-10 2011-08-18 C.D. Waelzholz Gmbh Method and device for the continuous creation of a bainite structure in a carbon steel, particularly in a strip steel
US8652396B2 (en) 2005-11-10 2014-02-18 C.D. Wälzholz GmbH Method and device for the continuous creation of a bainite structure in a carbon steel, particularly in a strip steel

Also Published As

Publication number Publication date
NL164610B (nl) 1980-08-15
FR2070881A1 (pt) 1971-09-17
NL7018315A (pt) 1971-06-18
SE364993B (pt) 1974-03-11
DE2061726C3 (de) 1978-09-21
DE2061726B2 (de) 1978-01-19
NL164610C (nl) 1981-01-15
FR2070881B1 (pt) 1977-01-21
JPS4923727B1 (pt) 1974-06-18
DE2061726A1 (de) 1971-08-05

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