JPS5616624A - Manufacture of si-cr system hot rolled high tensile steel sheet having high ductility and low yield ratio - Google Patents

Manufacture of si-cr system hot rolled high tensile steel sheet having high ductility and low yield ratio

Info

Publication number
JPS5616624A
JPS5616624A JP9161879A JP9161879A JPS5616624A JP S5616624 A JPS5616624 A JP S5616624A JP 9161879 A JP9161879 A JP 9161879A JP 9161879 A JP9161879 A JP 9161879A JP S5616624 A JPS5616624 A JP S5616624A
Authority
JP
Japan
Prior art keywords
steel sheet
manufacture
yield ratio
ratio
low yield
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
JP9161879A
Other languages
Japanese (ja)
Other versions
JPS5824489B2 (en
Inventor
Kunio Watanabe
Yoshio Hashimoto
Toyohiko Sato
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 JP9161879A priority Critical patent/JPS5824489B2/en
Publication of JPS5616624A publication Critical patent/JPS5616624A/en
Publication of JPS5824489B2 publication Critical patent/JPS5824489B2/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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips

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 steel sheet having low yield ratio, high strength, excellent ductility, by rolling steel having a specific composition contg. C, Si, Mn, Cr so that rolling may be completed in a specific temp. range. CONSTITUTION:Steel consisting by weight. of, 0.05-0.15% C, 1.01-2% Si, 0.5- 1.5% Mn, 0.05-0.8% Cr, the balance being Fe and inevitable impurities, and contg. at need <=0.015% S, in addition, Zr in the ratio 2<=Zr/S<=10 or rare earth elements (REM) in the ratio 1.3<=REM/S<=5 or Ca in the ratio 0.5<=Ca/S<=1.5 is rolled. The rolling is completed at a temp. >=Ar3-30 deg.C and <=Ar3+60 deg.C. The steel may be rolled after heated in a heating furnace of slab, then it is wound at 250-480 deg.C temp. thereby manufacturing steel sheet having <=60% yield ratio.
JP9161879A 1979-07-20 1979-07-20 Method for manufacturing Si-Cr based high ductility low yield ratio hot rolled high tensile strength steel sheet Expired JPS5824489B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9161879A JPS5824489B2 (en) 1979-07-20 1979-07-20 Method for manufacturing Si-Cr based high ductility low yield ratio hot rolled high tensile strength steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9161879A JPS5824489B2 (en) 1979-07-20 1979-07-20 Method for manufacturing Si-Cr based high ductility low yield ratio hot rolled high tensile strength steel sheet

Publications (2)

Publication Number Publication Date
JPS5616624A true JPS5616624A (en) 1981-02-17
JPS5824489B2 JPS5824489B2 (en) 1983-05-21

Family

ID=14031554

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9161879A Expired JPS5824489B2 (en) 1979-07-20 1979-07-20 Method for manufacturing Si-Cr based high ductility low yield ratio hot rolled high tensile strength steel sheet

Country Status (1)

Country Link
JP (1) JPS5824489B2 (en)

Also Published As

Publication number Publication date
JPS5824489B2 (en) 1983-05-21

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