JPS5562125A - Preparation of high strength cold rolled steel sheet having dent resisting property excellent in press moldability - Google Patents

Preparation of high strength cold rolled steel sheet having dent resisting property excellent in press moldability

Info

Publication number
JPS5562125A
JPS5562125A JP13516278A JP13516278A JPS5562125A JP S5562125 A JPS5562125 A JP S5562125A JP 13516278 A JP13516278 A JP 13516278A JP 13516278 A JP13516278 A JP 13516278A JP S5562125 A JPS5562125 A JP S5562125A
Authority
JP
Japan
Prior art keywords
cooling
point
carried out
high strength
rolled steel
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
JP13516278A
Other languages
Japanese (ja)
Inventor
Shinobu Aisaka
Masaharu Jitsukawa
Koichi Osawa
Takeshi Okuyama
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
NKK Corp
Nippon Kokan Ltd
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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP13516278A priority Critical patent/JPS5562125A/en
Publication of JPS5562125A publication Critical patent/JPS5562125A/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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets

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 the above mentioned sheet having a high yeild point and good elongation or n value, by carrying out the primary cooling unitl less than A1 point at a limited speed after carrying out cold rolling of steel composed of a specific quantity of C.Si.Mn.P.S.Sol.Al and N, after hot rolling and next, carrying out continuous annealing. CONSTITUTION:Hot rolling of steel composed of C<=0.1%, Si<=3%, Mn;0.15- 0.5%, P;0.01-0.1%, S<=0.03%, Sol.Al;0.02-0.07% and N;0.002-0.008%, is carried cut at a finishing temperature of more than A3 point and winding temperature of more than 600 deg.C. Next, cold rolling is carried out at more than 40% of draft and the primary cooling is carried out at less than 100 deg.C/sec. of cooling velocity cooling until less than A1 point (normally, 500-650 deg.C) after heating at 700- 800 deg.C by continuous annealing. Moreover, the secondary cooling is carried out cooling to a tempering temperature at the optional cooling velocity and tempering is carried out at 200-500 deg.C. By the above method, high strength cold rolled steel sheet composed of two phase structure of ferrite and pearlite, having a superior workability, is manufactured.
JP13516278A 1978-11-04 1978-11-04 Preparation of high strength cold rolled steel sheet having dent resisting property excellent in press moldability Pending JPS5562125A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13516278A JPS5562125A (en) 1978-11-04 1978-11-04 Preparation of high strength cold rolled steel sheet having dent resisting property excellent in press moldability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13516278A JPS5562125A (en) 1978-11-04 1978-11-04 Preparation of high strength cold rolled steel sheet having dent resisting property excellent in press moldability

Publications (1)

Publication Number Publication Date
JPS5562125A true JPS5562125A (en) 1980-05-10

Family

ID=15145264

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13516278A Pending JPS5562125A (en) 1978-11-04 1978-11-04 Preparation of high strength cold rolled steel sheet having dent resisting property excellent in press moldability

Country Status (1)

Country Link
JP (1) JPS5562125A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS572841A (en) * 1980-06-06 1982-01-08 Nippon Steel Corp Production of high strength cold-rolled steel plate which has high baking hardness and is superior in aging resistance and press workability by continuous annealing
JPS5767129A (en) * 1980-09-25 1982-04-23 Nippon Steel Corp Production of high-strength cold rolled steel plate for automobile
JPS61117225A (en) * 1985-10-31 1986-06-04 Nippon Kokan Kk <Nkk> Manufacture of high strength cold rolled steel sheet superior in press formability and baking hardenability
CN102226248A (en) * 2011-06-09 2011-10-26 北京科技大学 Carbon silicon manganese hot rolled quenching and partitioning (Q&P) steel and preparation method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53122612A (en) * 1977-04-01 1978-10-26 Nippon Kokan Kk <Nkk> Method of fabricating high tensile cold rolled steel plate

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53122612A (en) * 1977-04-01 1978-10-26 Nippon Kokan Kk <Nkk> Method of fabricating high tensile cold rolled steel plate

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS572841A (en) * 1980-06-06 1982-01-08 Nippon Steel Corp Production of high strength cold-rolled steel plate which has high baking hardness and is superior in aging resistance and press workability by continuous annealing
JPS6046165B2 (en) * 1980-06-06 1985-10-15 新日本製鐵株式会社 A method for producing high-strength cold-rolled steel sheets with high bake hardenability, excellent aging resistance, and press workability by continuous annealing.
JPS5767129A (en) * 1980-09-25 1982-04-23 Nippon Steel Corp Production of high-strength cold rolled steel plate for automobile
JPS5857492B2 (en) * 1980-09-25 1983-12-20 新日本製鐵株式会社 Manufacturing method of high-strength cold-rolled steel sheet for automobiles
JPS61117225A (en) * 1985-10-31 1986-06-04 Nippon Kokan Kk <Nkk> Manufacture of high strength cold rolled steel sheet superior in press formability and baking hardenability
CN102226248A (en) * 2011-06-09 2011-10-26 北京科技大学 Carbon silicon manganese hot rolled quenching and partitioning (Q&P) steel and preparation method thereof

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