JPS55145121A - Manufacture of high strength hoop having composite structure - Google Patents

Manufacture of high strength hoop having composite structure

Info

Publication number
JPS55145121A
JPS55145121A JP5277479A JP5277479A JPS55145121A JP S55145121 A JPS55145121 A JP S55145121A JP 5277479 A JP5277479 A JP 5277479A JP 5277479 A JP5277479 A JP 5277479A JP S55145121 A JPS55145121 A JP S55145121A
Authority
JP
Japan
Prior art keywords
hoop
cooled
temp
austenite
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.)
Granted
Application number
JP5277479A
Other languages
Japanese (ja)
Other versions
JPS5842246B2 (en
Inventor
Kenichi Shinoda
Toshiro Yamada
Harumi Ishii
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 Nisshin Co Ltd
Original Assignee
Nisshin Steel Co 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 Nisshin Steel Co Ltd filed Critical Nisshin Steel Co Ltd
Priority to JP5277479A priority Critical patent/JPS5842246B2/en
Publication of JPS55145121A publication Critical patent/JPS55145121A/en
Publication of JPS5842246B2 publication Critical patent/JPS5842246B2/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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening

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 Sheet Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

PURPOSE:To manufacture high strength hoop which has a structure composed of two phases, bainite and remained austenite, and is excellent in ductility, by the heat treatment of medium carbon steel hoop under specific conditions. CONSTITUTION:A hoop is manufactured from steel contg. 0.40-0.85% C, 1.4- 2.5% Si, 0.30-1.00% Mn. The structure of the hoop is completely converted to austenite by heating it at a temp. not lower than AC3 transformation point. Then the hoop is cooled to a temp. range 380-480 deg.C at a cooling rate not smaller than that passing the nose of TTT curve. The hoop is kept at a constant temp. until 65-85% of the super cooled austenite is transformed to bainite, then it is air-cooled or cooled at a cooling rate not smaller than that of air cooling to room temp. The hoop has a composite structure composed of 65-85% bainite, the balance being remained austenite, having simultaneously high strength and very high ductility, and high word-hardening property.
JP5277479A 1979-04-28 1979-04-28 Method for manufacturing high-strength steel strip with composite structure Expired JPS5842246B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5277479A JPS5842246B2 (en) 1979-04-28 1979-04-28 Method for manufacturing high-strength steel strip with composite structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5277479A JPS5842246B2 (en) 1979-04-28 1979-04-28 Method for manufacturing high-strength steel strip with composite structure

Publications (2)

Publication Number Publication Date
JPS55145121A true JPS55145121A (en) 1980-11-12
JPS5842246B2 JPS5842246B2 (en) 1983-09-19

Family

ID=12924202

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5277479A Expired JPS5842246B2 (en) 1979-04-28 1979-04-28 Method for manufacturing high-strength steel strip with composite structure

Country Status (1)

Country Link
JP (1) JPS5842246B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6043464A (en) * 1983-08-15 1985-03-08 Nippon Kokan Kk <Nkk> Steel sheet having high strength, high workability and composite structure and its manufacture
JPS6223961A (en) * 1985-07-25 1987-01-31 Kawasaki Steel Corp High tensile band stock and its production
JPS6479345A (en) * 1987-06-03 1989-03-24 Nippon Steel Corp High-strength hot rolled steel plate excellent in workability and its production
US5470529A (en) * 1994-03-08 1995-11-28 Sumitomo Metal Industries, Ltd. High tensile strength steel sheet having improved formability
WO2010074370A1 (en) * 2008-12-24 2010-07-01 주식회사 포스코 High-strength elongation steel sheet, hot-rolled steel sheet, cold-rolled steel sheet, zinc-coated steel sheet, and method for manufacturing alloyed zinc-coated steel sheet

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2796966B1 (en) * 1999-07-30 2001-09-21 Ugine Sa PROCESS FOR THE MANUFACTURE OF THIN STRIP OF TRIP-TYPE STEEL AND THIN STRIP THUS OBTAINED
JP4927899B2 (en) * 2009-03-25 2012-05-09 日本発條株式会社 Spring steel, method for producing the same, and spring
EP2662462A1 (en) * 2012-05-07 2013-11-13 Valls Besitz GmbH Low temperature hardenable steels with excellent machinability

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6043464A (en) * 1983-08-15 1985-03-08 Nippon Kokan Kk <Nkk> Steel sheet having high strength, high workability and composite structure and its manufacture
JPS6330367B2 (en) * 1983-08-15 1988-06-17 Nippon Kokan Kk
JPS6223961A (en) * 1985-07-25 1987-01-31 Kawasaki Steel Corp High tensile band stock and its production
JPS6479345A (en) * 1987-06-03 1989-03-24 Nippon Steel Corp High-strength hot rolled steel plate excellent in workability and its production
JPH0567682B2 (en) * 1987-06-03 1993-09-27 Nippon Steel Corp
US5470529A (en) * 1994-03-08 1995-11-28 Sumitomo Metal Industries, Ltd. High tensile strength steel sheet having improved formability
WO2010074370A1 (en) * 2008-12-24 2010-07-01 주식회사 포스코 High-strength elongation steel sheet, hot-rolled steel sheet, cold-rolled steel sheet, zinc-coated steel sheet, and method for manufacturing alloyed zinc-coated steel sheet

Also Published As

Publication number Publication date
JPS5842246B2 (en) 1983-09-19

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