JPS5743932A - Production of high strength cold rolled steel strip excellent in press formability and bake hardenability - Google Patents

Production of high strength cold rolled steel strip excellent in press formability and bake hardenability

Info

Publication number
JPS5743932A
JPS5743932A JP11858180A JP11858180A JPS5743932A JP S5743932 A JPS5743932 A JP S5743932A JP 11858180 A JP11858180 A JP 11858180A JP 11858180 A JP11858180 A JP 11858180A JP S5743932 A JPS5743932 A JP S5743932A
Authority
JP
Japan
Prior art keywords
steel strip
steel
press formability
production
high strength
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
JP11858180A
Other languages
Japanese (ja)
Inventor
Atsuki Okamoto
Masashi Takahashi
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
Sumitomo Metal Industries 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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP11858180A priority Critical patent/JPS5743932A/en
Publication of JPS5743932A publication Critical patent/JPS5743932A/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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

PURPOSE:To obtain a steel strip having excellent bake-hardenability and tensile strength by a method wherein a steel containing C, Mn, solAl, Si and P at specified ratios is subjected to hot rolling and cold rolling, followed by recrystallization annealing in a specified conditions. CONSTITUTION:A steel containing, by weight, 0.002-0.020% of C, 0.03-0.25% of Mn, 0.005-0.200% of solAl, 0.21-1.50% of Si, 0.02-0.20% of P, with the condition of 0.8<=Si(%)+8XP(%)<=2.4 satisfied, the balance being Fe and unavoidable impurities, is prepared. After conducting hot rolling and cold rolling in ordinary conditions, the steel is annealed in a box annealing furnace at a temperature of not lower than 600 deg.C, preferably in the range of 650-740 deg.C. Then, the steel is slowly cooled by apending 3-60hr for the temperature range of 500-200 deg.C where the precipitation of C occurs actively. Accordingly, a steel strip having a tensile strength of at least about 40kg/mm.<2> and excellent in press formability and shaping properties is obtained.
JP11858180A 1980-08-28 1980-08-28 Production of high strength cold rolled steel strip excellent in press formability and bake hardenability Pending JPS5743932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11858180A JPS5743932A (en) 1980-08-28 1980-08-28 Production of high strength cold rolled steel strip excellent in press formability and bake hardenability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11858180A JPS5743932A (en) 1980-08-28 1980-08-28 Production of high strength cold rolled steel strip excellent in press formability and bake hardenability

Publications (1)

Publication Number Publication Date
JPS5743932A true JPS5743932A (en) 1982-03-12

Family

ID=14740127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11858180A Pending JPS5743932A (en) 1980-08-28 1980-08-28 Production of high strength cold rolled steel strip excellent in press formability and bake hardenability

Country Status (1)

Country Link
JP (1) JPS5743932A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61297020A (en) * 1985-06-26 1986-12-27 Mitsubishi Electric Corp wire electrical discharge machining equipment
US5175408A (en) * 1988-10-29 1992-12-29 Fanuc Ltd Electrical discharge machine
US5470403A (en) * 1992-06-22 1995-11-28 Nippon Steel Corporation Cold rolled steel sheet and hot dip zinc-coated cold rolled steel sheet having excellent bake hardenability, non-aging properties and formability, and process for producing same
US5690755A (en) * 1992-08-31 1997-11-25 Nippon Steel Corporation Cold-rolled steel sheet and hot-dip galvanized cold-rolled steel sheet having excellent bake hardenability, non-aging properties at room temperature and good formability and process for producing the same
KR100759197B1 (en) 2006-06-30 2007-09-14 현대하이스코 주식회사 Heat Treatment Method Using Box Annealing Furnace for Cold Rolled Steel Sheets

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61297020A (en) * 1985-06-26 1986-12-27 Mitsubishi Electric Corp wire electrical discharge machining equipment
US5175408A (en) * 1988-10-29 1992-12-29 Fanuc Ltd Electrical discharge machine
US5470403A (en) * 1992-06-22 1995-11-28 Nippon Steel Corporation Cold rolled steel sheet and hot dip zinc-coated cold rolled steel sheet having excellent bake hardenability, non-aging properties and formability, and process for producing same
US5690755A (en) * 1992-08-31 1997-11-25 Nippon Steel Corporation Cold-rolled steel sheet and hot-dip galvanized cold-rolled steel sheet having excellent bake hardenability, non-aging properties at room temperature and good formability and process for producing the same
KR100759197B1 (en) 2006-06-30 2007-09-14 현대하이스코 주식회사 Heat Treatment Method Using Box Annealing Furnace for Cold Rolled Steel Sheets

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