JPS5776124A - Manufacture of low termperature steel - Google Patents

Manufacture of low termperature steel

Info

Publication number
JPS5776124A
JPS5776124A JP1562181A JP1562181A JPS5776124A JP S5776124 A JPS5776124 A JP S5776124A JP 1562181 A JP1562181 A JP 1562181A JP 1562181 A JP1562181 A JP 1562181A JP S5776124 A JPS5776124 A JP S5776124A
Authority
JP
Japan
Prior art keywords
low temperature
steel
cooled
cooling
heated
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
JP1562181A
Other languages
Japanese (ja)
Inventor
Gennosuke Tenmiyo
Junichi Tanaka
Makoto Yamada
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP1562181A priority Critical patent/JPS5776124A/en
Publication of JPS5776124A publication Critical patent/JPS5776124A/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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/001—Heat treatment of ferrous alloys containing Ni

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)

Abstract

PURPOSE:To improve extreme low temperature toughness and provide excellent properties equal to or more than 9% Ni steel by performing specified heat-treatment to low temperature steel containing 3-4% Ni. CONSTITUTION:After low temperature steel containing 3-4% Ni is heated at the temperature over the transformation point Ac3, 750 deg.C and austenitized, it is water- cooled. Then, heating and cooling cycle is repeated once or more, in which it is heated in the temperature range from the true transforation point Ac1 to the apparent transformation point Ac1+60 deg.C, i.e. 610-700 deg.C, thereafter it is cooled at the cooling speed faster than cooling in air. Finally, it is cooled below the apparent transformation temperature Ac1-20 deg.C. Low temperature toughness is considerably improved by this heat-treatment and low temperature steel having low temperature toughness equal to or better than 9% Ni steel can be obtained.
JP1562181A 1981-02-06 1981-02-06 Manufacture of low termperature steel Pending JPS5776124A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1562181A JPS5776124A (en) 1981-02-06 1981-02-06 Manufacture of low termperature steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1562181A JPS5776124A (en) 1981-02-06 1981-02-06 Manufacture of low termperature steel

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP163781A Division JPS5729527A (en) 1981-01-10 1981-01-10 Preparation of steel for low temperature

Publications (1)

Publication Number Publication Date
JPS5776124A true JPS5776124A (en) 1982-05-13

Family

ID=11893775

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1562181A Pending JPS5776124A (en) 1981-02-06 1981-02-06 Manufacture of low termperature steel

Country Status (1)

Country Link
JP (1) JPS5776124A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523072A (en) * 1982-09-04 1985-06-11 Sumitomo Metal Industries, Ltd. Production of electrical resistance welded steel tubes with welds having improved toughness

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523072A (en) * 1982-09-04 1985-06-11 Sumitomo Metal Industries, Ltd. Production of electrical resistance welded steel tubes with welds having improved toughness

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