JPS5741328A - Operating method for base fan of box type coil annealing furnace - Google Patents

Operating method for base fan of box type coil annealing furnace

Info

Publication number
JPS5741328A
JPS5741328A JP11469780A JP11469780A JPS5741328A JP S5741328 A JPS5741328 A JP S5741328A JP 11469780 A JP11469780 A JP 11469780A JP 11469780 A JP11469780 A JP 11469780A JP S5741328 A JPS5741328 A JP S5741328A
Authority
JP
Japan
Prior art keywords
base fan
period
revolutions
heat transfer
temp
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.)
Granted
Application number
JP11469780A
Other languages
Japanese (ja)
Other versions
JPS6037864B2 (en
Inventor
Toshihiro Okochi
Kazuo Kobayashi
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP11469780A priority Critical patent/JPS6037864B2/en
Publication of JPS5741328A publication Critical patent/JPS5741328A/en
Publication of JPS6037864B2 publication Critical patent/JPS6037864B2/en
Expired legal-status Critical Current

Links

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
    • 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

Landscapes

  • 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)

Abstract

PURPOSE:To save electric power considerably by fully operating a base fan in a heating period and a natural cooling period and decreasing the number of revolutions of the base fan within the range of not lowering the overall heat transfer coefft. in a furnace in a soaking period and a force cooling period. CONSTITUTION:The quantity of heat transfer from a furnace to the center of a coil in a heating period and a soaking period is as per the equation I, wherein (t) is the temp. of an inner cover, t4 is the temp. at the center of the coil, Fc is the heat transfer area of the coil, beta Fi/Fc, Fi are the heat transfer areas of the inner cover, and KT is the overall heat transfer coefft. In spite of decreasing the unmber of revolutions of the base fan, the decrease in the KT is small if the gaseous temp. exceeds about 700 deg.C (corresponds roughly to a soaking period), and at above 0.6 ratio of the number of revolutions, it is negligible. The force cooling period is expressed by the equation II, and in the case of force cooling cooler cooling, if the gaseous temp. lowers to a certain degree, the decrease in the KT, is small and is virtually negligible in spite of decreasing the number of revolutions of the base fan. Thereby, the annealing capacity is maintained with a certain decrease in the number of revolutions of the base fan.
JP11469780A 1980-08-22 1980-08-22 How to operate the base fan of a box-shaped coil annealing furnace Expired JPS6037864B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11469780A JPS6037864B2 (en) 1980-08-22 1980-08-22 How to operate the base fan of a box-shaped coil annealing furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11469780A JPS6037864B2 (en) 1980-08-22 1980-08-22 How to operate the base fan of a box-shaped coil annealing furnace

Publications (2)

Publication Number Publication Date
JPS5741328A true JPS5741328A (en) 1982-03-08
JPS6037864B2 JPS6037864B2 (en) 1985-08-28

Family

ID=14644358

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11469780A Expired JPS6037864B2 (en) 1980-08-22 1980-08-22 How to operate the base fan of a box-shaped coil annealing furnace

Country Status (1)

Country Link
JP (1) JPS6037864B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015117415A (en) * 2013-12-19 2015-06-25 Ｊｆｅスチール株式会社 Coil cooling method after finish annealing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015117415A (en) * 2013-12-19 2015-06-25 Ｊｆｅスチール株式会社 Coil cooling method after finish annealing

Also Published As

Publication number Publication date
JPS6037864B2 (en) 1985-08-28

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