JPS5794521A - Method for manufacturing cold rolled steel sheet having excellent baking hardenability by continuous annealing - Google Patents

Method for manufacturing cold rolled steel sheet having excellent baking hardenability by continuous annealing

Info

Publication number
JPS5794521A
JPS5794521A JP16915680A JP16915680A JPS5794521A JP S5794521 A JPS5794521 A JP S5794521A JP 16915680 A JP16915680 A JP 16915680A JP 16915680 A JP16915680 A JP 16915680A JP S5794521 A JPS5794521 A JP S5794521A
Authority
JP
Japan
Prior art keywords
steel sheet
cold rolled
rolled steel
temperature
solid solution
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
JP16915680A
Other languages
Japanese (ja)
Inventor
Yoshihiko Takeoka
Kazuo Koyama
Yukio Kuroda
Norimasa Uehara
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 JP16915680A priority Critical patent/JPS5794521A/en
Publication of JPS5794521A publication Critical patent/JPS5794521A/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 Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

PURPOSE:To obtain a cold rolled steel sheet having high baking hardenability suitable for making car body, etc., by subjecting a cold rolled steel strip to recrystallization annealing at a specified temperature and an over aging treatment, then quenching said strip after cooling gradually. CONSTITUTION:In the course of the continuous annealing of a cold rolled steel strip, a recrystallization annealing is performed for 10sec-10min at a temperature higher than the recrystallization temperature and <=880 deg.C, and the carbon is dissolved into the steel to form a solid solution. Then, the steel sheet is subjected to an over aging treatment under a condition where the carbon is dissolved supersaturately into solid solution, for more than one minute from 300 to 500 deg.C. After the over aging treatment, the steel sheet is gradually cooled to a temperature which is lower than the over-aging temperature from 250 deg.C to 350 deg.C, at a cooling rate of 10-60 deg.C/sec. After the gradual cooling, the steel sheet is quenched. When this method is applied, an appropriate amount of solid solution of carbon remains in the steel, and, by strain aging due to the solid solution of carbon, a baking hardenability after bake-painting is given to the steel.
JP16915680A 1980-12-02 1980-12-02 Method for manufacturing cold rolled steel sheet having excellent baking hardenability by continuous annealing Pending JPS5794521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16915680A JPS5794521A (en) 1980-12-02 1980-12-02 Method for manufacturing cold rolled steel sheet having excellent baking hardenability by continuous annealing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16915680A JPS5794521A (en) 1980-12-02 1980-12-02 Method for manufacturing cold rolled steel sheet having excellent baking hardenability by continuous annealing

Publications (1)

Publication Number Publication Date
JPS5794521A true JPS5794521A (en) 1982-06-12

Family

ID=15881317

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16915680A Pending JPS5794521A (en) 1980-12-02 1980-12-02 Method for manufacturing cold rolled steel sheet having excellent baking hardenability by continuous annealing

Country Status (1)

Country Link
JP (1) JPS5794521A (en)

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