JPS55110728A - Improvement of residual stress in outside of steel pipe - Google Patents
Improvement of residual stress in outside of steel pipeInfo
- Publication number
- JPS55110728A JPS55110728A JP1728679A JP1728679A JPS55110728A JP S55110728 A JPS55110728 A JP S55110728A JP 1728679 A JP1728679 A JP 1728679A JP 1728679 A JP1728679 A JP 1728679A JP S55110728 A JPS55110728 A JP S55110728A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- outside
- cooler
- cooled
- stress
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 title abstract 11
- 239000010959 steel Substances 0.000 title abstract 11
- 238000005260 corrosion Methods 0.000 abstract 2
- 230000008642 heat stress Effects 0.000 abstract 2
- 230000035882 stress Effects 0.000 abstract 2
- 239000002826 coolant Substances 0.000 abstract 1
- 238000005336 cracking Methods 0.000 abstract 1
- -1 e.g. Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000006698 induction Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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 prevent the development of stress-corrosion cracks by retaining compressive stress in the surface of steel pipe by the procedure in which a heat stress greater than the yielding strength of the material of steel pipe is produced on both inside and outside of the steel pipe and then the steel pipe is cooled continuously. CONSTITUTION:The outside of the welded junction 2 of the steel pipe 1 is provided with the cooler 3 and then the both sides of the cooler of the steel pipe are provided with the high-frequency induction heaters 4. Then, in and around the welded junction 2 are cooled, the both sides of the welded junction are heated, and at the same time the inside of the steel pipe 1 is cooled by flowing a cooling medium, e.g., water in the pipe. Thus, a temperature defference is brought about between the inside and outside of the wall 5 of the steel pipe 1, or in the thickwise direction, and between the portion 7 surrounded by the heaters 4 and the locally cooled portion 6 surrounded by the cooler 3, or in the radial direction of the steel pipe 1, whereby causing deformation to take place in the locally cooled portion 6. In this case, heat stresses are produced in the radial direction and in the thickwise direction of the pipe wall 5, and under such a condition, heating is stopped, the steel pipe 1 is restored to ordinary temperature, compressive stress is retained on the cooler 3 side and even on the other side, and stress-corrosion cracking is prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1728679A JPS5952689B2 (en) | 1979-02-19 | 1979-02-19 | Method for improving residual stress on the inner and outer surfaces of steel pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1728679A JPS5952689B2 (en) | 1979-02-19 | 1979-02-19 | Method for improving residual stress on the inner and outer surfaces of steel pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55110728A true JPS55110728A (en) | 1980-08-26 |
| JPS5952689B2 JPS5952689B2 (en) | 1984-12-21 |
Family
ID=11939733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1728679A Expired JPS5952689B2 (en) | 1979-02-19 | 1979-02-19 | Method for improving residual stress on the inner and outer surfaces of steel pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5952689B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58199814A (en) * | 1982-05-15 | 1983-11-21 | Nippon Steel Corp | Production of steel pipe having excellent resistance to stress corrosion cracking |
| JPS60106916A (en) * | 1983-11-12 | 1985-06-12 | Ishikawajima Harima Heavy Ind Co Ltd | Tube heat treatment method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61168685U (en) * | 1985-04-08 | 1986-10-20 | ||
| JPH0563087U (en) * | 1992-01-31 | 1993-08-20 | ミツミ電機株式会社 | Liquid crystal display mounting structure |
-
1979
- 1979-02-19 JP JP1728679A patent/JPS5952689B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58199814A (en) * | 1982-05-15 | 1983-11-21 | Nippon Steel Corp | Production of steel pipe having excellent resistance to stress corrosion cracking |
| JPS60106916A (en) * | 1983-11-12 | 1985-06-12 | Ishikawajima Harima Heavy Ind Co Ltd | Tube heat treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5952689B2 (en) | 1984-12-21 |
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