JPS57177924A - Improving method for residual stress on both surfaces - Google Patents

Improving method for residual stress on both surfaces

Info

Publication number
JPS57177924A
JPS57177924A JP6338381A JP6338381A JPS57177924A JP S57177924 A JPS57177924 A JP S57177924A JP 6338381 A JP6338381 A JP 6338381A JP 6338381 A JP6338381 A JP 6338381A JP S57177924 A JPS57177924 A JP S57177924A
Authority
JP
Japan
Prior art keywords
pipe
internal pressure
residual stress
cooling
ice
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
JP6338381A
Other languages
Japanese (ja)
Other versions
JPS6235458B2 (en
Inventor
Risuke Nayama
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy 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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP6338381A priority Critical patent/JPS57177924A/en
Publication of JPS57177924A publication Critical patent/JPS57177924A/en
Publication of JPS6235458B2 publication Critical patent/JPS6235458B2/ja
Granted 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
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

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 Articles (AREA)

Abstract

PURPOSE:To eliminate the variance in the effect after execution of a freezing method for the purpose of improving the residual stress on the inside surface of plant pipings and tubular vessels in said method by combining quick heating for the pipe with the stopping of the cooling upon arrival of the intended internal pressure, thereby quickly dropping the pressure in the pipe. CONSTITUTION:The internal pressure in the section W enclosed by the two ice plugs I1, I2 in a pipe T is increased by the growth of the ice to deform the pipe T plastically, whereby a residual stress state is improved. Upon arrival of said internal pressure at the prescribed internal pressure at this time, the cooling is stopped; at the same time, electric current is conducted between the ring-like electrodes E and E mounted on the outer side in the cooling section J-J, that is, the pipe T, so that Joule heat is evolved. The pipe diameter is expanded by the thermal expansion caused by this quick heating of the pipe; at the same time, the binding force of the ice plugs to the pipe wall is decreased by the temp. elevation of the pipe wall and the internal pressure of the pipe is reduced quickly.
JP6338381A 1981-04-28 1981-04-28 Improving method for residual stress on both surfaces Granted JPS57177924A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6338381A JPS57177924A (en) 1981-04-28 1981-04-28 Improving method for residual stress on both surfaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6338381A JPS57177924A (en) 1981-04-28 1981-04-28 Improving method for residual stress on both surfaces

Publications (2)

Publication Number Publication Date
JPS57177924A true JPS57177924A (en) 1982-11-01
JPS6235458B2 JPS6235458B2 (en) 1987-08-01

Family

ID=13227714

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6338381A Granted JPS57177924A (en) 1981-04-28 1981-04-28 Improving method for residual stress on both surfaces

Country Status (1)

Country Link
JP (1) JPS57177924A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3507293A1 (en) * 1984-03-14 1985-09-26 Voest-Alpine Ag, Linz METHOD FOR INCREASING THE STRENGTH OF SINGLE-WALLED TUBULAR COMPONENTS, AND APPARATUS FOR CARRYING OUT THIS METHOD
JP2005320626A (en) * 2004-04-06 2005-11-17 Hitachi Ltd Heat treatment method and apparatus therefor
US7565812B2 (en) 2005-05-31 2009-07-28 Hitachi-Ge Nuclear Energy, Ltd. Method for improving residual stress in pipe and apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3507293A1 (en) * 1984-03-14 1985-09-26 Voest-Alpine Ag, Linz METHOD FOR INCREASING THE STRENGTH OF SINGLE-WALLED TUBULAR COMPONENTS, AND APPARATUS FOR CARRYING OUT THIS METHOD
JP2005320626A (en) * 2004-04-06 2005-11-17 Hitachi Ltd Heat treatment method and apparatus therefor
US7565812B2 (en) 2005-05-31 2009-07-28 Hitachi-Ge Nuclear Energy, Ltd. Method for improving residual stress in pipe and apparatus
US7866166B2 (en) 2005-05-31 2011-01-11 Hitachi-Ge Nuclear Energy, Ltd. Method for improving residual stress in pipe and apparatus

Also Published As

Publication number Publication date
JPS6235458B2 (en) 1987-08-01

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