JPS55128530A - Method and apparatus for controlling atmosphere of direct fire heating type deoxidizing furnace - Google Patents

Method and apparatus for controlling atmosphere of direct fire heating type deoxidizing furnace

Info

Publication number
JPS55128530A
JPS55128530A JP3470079A JP3470079A JPS55128530A JP S55128530 A JPS55128530 A JP S55128530A JP 3470079 A JP3470079 A JP 3470079A JP 3470079 A JP3470079 A JP 3470079A JP S55128530 A JPS55128530 A JP S55128530A
Authority
JP
Japan
Prior art keywords
atmosphere
furnace
steel strip
content
heating type
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
JP3470079A
Other languages
Japanese (ja)
Other versions
JPS6119693B2 (en
Inventor
Hajime Hinoto
Hiromitsu Naito
Kazuhiko Yoshinari
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 JP3470079A priority Critical patent/JPS55128530A/en
Publication of JPS55128530A publication Critical patent/JPS55128530A/en
Publication of JPS6119693B2 publication Critical patent/JPS6119693B2/ja
Granted 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere

Abstract

PURPOSE:To reduced the oxidized film thickness on a surface of a steel strip to below 1000Angstrom by a method wherein, in case of continuously annealing a cold rolling steel strip in a direct fire heating type deoxidizing furnace, the CO content contained in a furnace atmosphere is continuously analyzed and the air amount for combusting a fuel is controlled by the output thereof to control the generation of free oxygen within an atmosphere. CONSTITUTION:A cold rolling steel strip S is introduced into a direct fire heating type deoxidizing furnace 1 and heat annealed by plural burners. In this case, the CO contained within a furnace atmosphere is analyzed by an analyzer 7 and the electric voltage Ea corresponding to a CO amount is generated. On the other hand, a standard electric voltage Es comprising an electric source 10 and a resistance 9 is set to the output side of an analyzer 7 and, in case of Ea<Es, a CO content is below 0.01% to an objective value and free O2 is present in an atmosphere. In this time, a motor 6-1 of an opening degree adjusting apparatus 6 for an electromotive valve 5 in an air arranged pipe 3 is driven by the voltage Ei generated in an amplifier 8 to reduce the valve opening degree and a CO content in a furnace atmosphere is increased to 0.01-1.0% as well as free O2 content is controlled to reduce the oxidized film thickness formed on a surface of a steel strip S to below 1000Angstrom .
JP3470079A 1979-03-24 1979-03-24 Method and apparatus for controlling atmosphere of direct fire heating type deoxidizing furnace Granted JPS55128530A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3470079A JPS55128530A (en) 1979-03-24 1979-03-24 Method and apparatus for controlling atmosphere of direct fire heating type deoxidizing furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3470079A JPS55128530A (en) 1979-03-24 1979-03-24 Method and apparatus for controlling atmosphere of direct fire heating type deoxidizing furnace

Publications (2)

Publication Number Publication Date
JPS55128530A true JPS55128530A (en) 1980-10-04
JPS6119693B2 JPS6119693B2 (en) 1986-05-19

Family

ID=12421635

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3470079A Granted JPS55128530A (en) 1979-03-24 1979-03-24 Method and apparatus for controlling atmosphere of direct fire heating type deoxidizing furnace

Country Status (1)

Country Link
JP (1) JPS55128530A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556838A1 (en) * 1983-12-20 1985-06-21 Nippon Steel Corp METHOD FOR QUANTITATIVELY DETECTING DECARBURATION REACTION IN THE PROCESS OF MANUFACTURING AN ELECTRIC STEEL SHEET
JPS6240320A (en) * 1985-08-13 1987-02-21 Sumitomo Metal Ind Ltd Method for measuring thickness of oxide film in continuous annealing furnace
US20150013847A1 (en) * 2012-03-09 2015-01-15 Baoshan Iron & Steel Co., Ltd. Method for Producing Silicon Steel Normalizing Substrate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556838A1 (en) * 1983-12-20 1985-06-21 Nippon Steel Corp METHOD FOR QUANTITATIVELY DETECTING DECARBURATION REACTION IN THE PROCESS OF MANUFACTURING AN ELECTRIC STEEL SHEET
JPS6240320A (en) * 1985-08-13 1987-02-21 Sumitomo Metal Ind Ltd Method for measuring thickness of oxide film in continuous annealing furnace
US20150013847A1 (en) * 2012-03-09 2015-01-15 Baoshan Iron & Steel Co., Ltd. Method for Producing Silicon Steel Normalizing Substrate
US9822423B2 (en) * 2012-03-09 2017-11-21 Baoshan Iron & Steel, Co., Ltd. Method for producing silicon steel normalizing substrate

Also Published As

Publication number Publication date
JPS6119693B2 (en) 1986-05-19

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