JPS5732330A - Production of high strength cold rolled steel plate of superior quench hardenability and formability - Google Patents

Production of high strength cold rolled steel plate of superior quench hardenability and formability

Info

Publication number
JPS5732330A
JPS5732330A JP10811080A JP10811080A JPS5732330A JP S5732330 A JPS5732330 A JP S5732330A JP 10811080 A JP10811080 A JP 10811080A JP 10811080 A JP10811080 A JP 10811080A JP S5732330 A JPS5732330 A JP S5732330A
Authority
JP
Japan
Prior art keywords
steel plate
quench hardenability
cold rolled
rolled steel
formability
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
JP10811080A
Other languages
Japanese (ja)
Inventor
Yoshikuni Tokunaga
Yaichiro Mizuyama
Koji Kishida
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 JP10811080A priority Critical patent/JPS5732330A/en
Publication of JPS5732330A publication Critical patent/JPS5732330A/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 a cold rolled steel plate of about 40-55kg/mm.<2> tensile strengths having a high (r) value and quench hardenability by performing annealing after hot rolling and cold rolling of Al killed steel of an increased content of Si in a batch tupe annealing furnace. CONSTITUTION:Steel consisting of 0.005-0.02 C by %, 1.0-2.0 Si, 0.03-0.5 Mn, <=0.1 P, 0.02-0.08 Al, 0.002-0.020 N and the balance Fe and unavoidable impurities is hot rolled, and after it is coiled at below 600 deg.C, it is cold rolled. The resultant steel plate is annealed in a continuous heat treatment furnace in coil units such as an open coil or tight coil type box annealing furnace. Here, below the lower limit of C, quench hardenability is low. If Si is below the lower limit, the strength of levels cannot be obtained and the effect that it gives on the quench hardenability is less. In excess of the upper limit, an (r) value decreases considerably; at the same time, crystal grains coarsen, resulting in an increased rate of surface roughening. If the Mn exceeds the upper limit, the (r) value decreases considerably.
JP10811080A 1980-08-06 1980-08-06 Production of high strength cold rolled steel plate of superior quench hardenability and formability Pending JPS5732330A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10811080A JPS5732330A (en) 1980-08-06 1980-08-06 Production of high strength cold rolled steel plate of superior quench hardenability and formability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10811080A JPS5732330A (en) 1980-08-06 1980-08-06 Production of high strength cold rolled steel plate of superior quench hardenability and formability

Publications (1)

Publication Number Publication Date
JPS5732330A true JPS5732330A (en) 1982-02-22

Family

ID=14476140

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10811080A Pending JPS5732330A (en) 1980-08-06 1980-08-06 Production of high strength cold rolled steel plate of superior quench hardenability and formability

Country Status (1)

Country Link
JP (1) JPS5732330A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5852432A (en) * 1981-09-19 1983-03-28 Sumitomo Metal Ind Ltd Production of thermally hardenable thin steel sheet
KR100759197B1 (en) 2006-06-30 2007-09-14 현대하이스코 주식회사 Baf heat treating method for ultra deep drawing cold rolled steel sheet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5852432A (en) * 1981-09-19 1983-03-28 Sumitomo Metal Ind Ltd Production of thermally hardenable thin steel sheet
KR100759197B1 (en) 2006-06-30 2007-09-14 현대하이스코 주식회사 Baf heat treating method for ultra deep drawing cold rolled steel sheet

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