JPS5757839A - Continuous production installation for high tensile steel strip having composite structure - Google Patents

Continuous production installation for high tensile steel strip having composite structure

Info

Publication number
JPS5757839A
JPS5757839A JP13060780A JP13060780A JPS5757839A JP S5757839 A JPS5757839 A JP S5757839A JP 13060780 A JP13060780 A JP 13060780A JP 13060780 A JP13060780 A JP 13060780A JP S5757839 A JPS5757839 A JP S5757839A
Authority
JP
Japan
Prior art keywords
steel strip
zone
cooling zone
cooling
diameters
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.)
Pending
Application number
JP13060780A
Other languages
Japanese (ja)
Inventor
Hiroshi Takechi
Soji Matsuo
Takashi Furukawa
Koichi Sakurai
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 JP13060780A priority Critical patent/JPS5757839A/en
Publication of JPS5757839A publication Critical patent/JPS5757839A/en
Pending 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 produce a high tensile low yield point steel strip having composite structure continuously by setting the diameters of the hearth rolls in the cooling zone of a heat treatment device for steel strips at specific sizes and controlling the cooling rate of the steel strip adequately. CONSTITUTION:A steel strip is passed continuously through the inside of a heating zone 5, a soaking zone 6, a primary cooling zone 7, and a secondary cooling zone, whereby it is heat-treated. In the cooling zone 5, it is heated for <=3min in a temp. region of 723-900 deg.C where alpha phase and gamma phase coexist, or for <=10min in gamma phase region of 900-1,000 deg.C. Next, it is held for 300sec-500min at 723-900 deg.C or 1-10min at 900-1,000 deg.C in the soaking zone 6. In the primary cooling zone 7, the steel strip is colled at 1-300 deg.C/sec cooling rates down to 200-300 deg.C, and in the secondary cooling zone 8, it is cooled down to below 200 deg.C. Here, the diameters of upper, lower hearth rolls 17, 18, 17', 18' of the cooling zones are set at the sizes expressed by the equation (I), and the diameters of the plied rolls of ancillary equipment are regulated at the sizes expressed by the equation (II).
JP13060780A 1980-09-22 1980-09-22 Continuous production installation for high tensile steel strip having composite structure Pending JPS5757839A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13060780A JPS5757839A (en) 1980-09-22 1980-09-22 Continuous production installation for high tensile steel strip having composite structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13060780A JPS5757839A (en) 1980-09-22 1980-09-22 Continuous production installation for high tensile steel strip having composite structure

Publications (1)

Publication Number Publication Date
JPS5757839A true JPS5757839A (en) 1982-04-07

Family

ID=15038251

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13060780A Pending JPS5757839A (en) 1980-09-22 1980-09-22 Continuous production installation for high tensile steel strip having composite structure

Country Status (1)

Country Link
JP (1) JPS5757839A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4963046A (en) * 1987-05-13 1990-10-16 Kao Corporation Toothbrush

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54120222A (en) * 1978-03-10 1979-09-18 Nippon Steel Corp Continuously manufacturing equipment for high tensile steel strip of composite structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54120222A (en) * 1978-03-10 1979-09-18 Nippon Steel Corp Continuously manufacturing equipment for high tensile steel strip of composite structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4963046A (en) * 1987-05-13 1990-10-16 Kao Corporation Toothbrush

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