JPS55158227A - Manufacture of high strength cold steel sheet excellent in formability and baking hardenability - Google Patents

Manufacture of high strength cold steel sheet excellent in formability and baking hardenability

Info

Publication number
JPS55158227A
JPS55158227A JP6528679A JP6528679A JPS55158227A JP S55158227 A JPS55158227 A JP S55158227A JP 6528679 A JP6528679 A JP 6528679A JP 6528679 A JP6528679 A JP 6528679A JP S55158227 A JPS55158227 A JP S55158227A
Authority
JP
Japan
Prior art keywords
steel sheet
formability
sheet excellent
slab
baking hardenability
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
JP6528679A
Other languages
Japanese (ja)
Other versions
JPS5842247B2 (en
Inventor
Hiroshi Hirano
Masuhiro Sato
Ichiro Kokubo
Shingo Nomura
Katsumi Kameno
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP6528679A priority Critical patent/JPS5842247B2/en
Publication of JPS55158227A publication Critical patent/JPS55158227A/en
Publication of JPS5842247B2 publication Critical patent/JPS5842247B2/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
    • C21D9/46—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 manufacture high strength cold rolled steel sheet excellent in press formability and baking hardenability, by the hot rolling and cold rolling of steel material having a ratio of Si/Mn not small than 1 to form steel sheet, then by cooling at a specific cooling rate after batch annealing. CONSTITUTION:Molten steel contg. 0.01-0.20% C, 0.7-3.0% Si, <=0.7% Mn, and having a ratio of Si/Mn not smaller than 1 is made into ingot, bloomed, or continuously cast to form a slab. The slab is finishing hot rolled at a temp. not lower than Ar3 transformation temp., descaled, and cold rolled at a reduction ratio not lower than 40%. After batch annealing at a temp. 650-800 deg.C, the slab is cooled rapidly at a rate not lower than 80 deg.C/hr thereby securing crystal arrangement preferable for formability, simultaneously manufacturing steel sheet excellent in tensile strength, formability, and baking hardenability by keeping the presence of carbide, the quantity of N in solid solution and C in solid solution at a proper value. Presence of 0.03-0.20% P and 0.015-0.15% Al further improves the above-described characteristics.
JP6528679A 1979-05-26 1979-05-26 Method for manufacturing high-strength cold-rolled steel sheets with excellent formability and bake hardenability Expired JPS5842247B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6528679A JPS5842247B2 (en) 1979-05-26 1979-05-26 Method for manufacturing high-strength cold-rolled steel sheets with excellent formability and bake hardenability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6528679A JPS5842247B2 (en) 1979-05-26 1979-05-26 Method for manufacturing high-strength cold-rolled steel sheets with excellent formability and bake hardenability

Publications (2)

Publication Number Publication Date
JPS55158227A true JPS55158227A (en) 1980-12-09
JPS5842247B2 JPS5842247B2 (en) 1983-09-19

Family

ID=13282530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6528679A Expired JPS5842247B2 (en) 1979-05-26 1979-05-26 Method for manufacturing high-strength cold-rolled steel sheets with excellent formability and bake hardenability

Country Status (1)

Country Link
JP (1) JPS5842247B2 (en)

Also Published As

Publication number Publication date
JPS5842247B2 (en) 1983-09-19

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