JPS5576025A - Structure improving heat treatment method of welding heat affected zone of low alloy steel - Google Patents
Structure improving heat treatment method of welding heat affected zone of low alloy steelInfo
- Publication number
- JPS5576025A JPS5576025A JP14970378A JP14970378A JPS5576025A JP S5576025 A JPS5576025 A JP S5576025A JP 14970378 A JP14970378 A JP 14970378A JP 14970378 A JP14970378 A JP 14970378A JP S5576025 A JPS5576025 A JP S5576025A
- Authority
- JP
- Japan
- Prior art keywords
- heat affected
- affected zone
- alloy steel
- low alloy
- crack
- 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
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
- C21D9/50—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 occurrence of reheat crack or notch creep crack or the like while in use, by applying a special heat treatment to the coarse grain structure region in the heat affected zone formed in the boundary vicinity surface layer part of weld joint of low alloy steel structure to turn the structure to fine grains. CONSTITUTION:Members 1, 1 made of low alloy steel such as Cr-Mo steel are welded together to form a weld joint 2. At this time, welding heat affected zones 3, 3 are formed on both sides thereof. These heat affected zones 3 are heated to high temperatures to produce coarse grain region, which may result in reheat crack or notch creep crack when put in use in operation. In order to prevent occurrence of such defects, a high frequency coil 4 is applied to each welding heat affected zone 3, and the surface layer of the heat affected zone 3 is heated to a temperature slightly higher than the austeniting temperature Ac3 by high frequency induction heating. Then, letting stand to cool, the coarse grain region in the welding heat affected zone 3 remaining in the vicinity of weld joint 2 is improved to fine grain structure, so that occurrence of defects such as reheat crack due to stress-relieving annealing and plant operation may be prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14970378A JPS5576025A (en) | 1978-12-05 | 1978-12-05 | Structure improving heat treatment method of welding heat affected zone of low alloy steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14970378A JPS5576025A (en) | 1978-12-05 | 1978-12-05 | Structure improving heat treatment method of welding heat affected zone of low alloy steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5576025A true JPS5576025A (en) | 1980-06-07 |
Family
ID=15480962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14970378A Pending JPS5576025A (en) | 1978-12-05 | 1978-12-05 | Structure improving heat treatment method of welding heat affected zone of low alloy steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5576025A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61170517A (en) * | 1985-01-23 | 1986-08-01 | Hitachi Ltd | Heat treatment of welded structure |
| WO2008031210A1 (en) * | 2006-09-15 | 2008-03-20 | Algoma Steel Inc. | Method for manufacturing a welded assembly |
| US8220697B2 (en) | 2005-01-18 | 2012-07-17 | Siemens Energy, Inc. | Weldability of alloys with directionally-solidified grain structure |
| CN111094824A (en) * | 2017-09-22 | 2020-05-01 | 三菱日立电力***株式会社 | Method for setting cooling temperature of metal wall and method for cooling metal wall |
-
1978
- 1978-12-05 JP JP14970378A patent/JPS5576025A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61170517A (en) * | 1985-01-23 | 1986-08-01 | Hitachi Ltd | Heat treatment of welded structure |
| JPH0373607B2 (en) * | 1985-01-23 | 1991-11-22 | Hitachi Ltd | |
| US8220697B2 (en) | 2005-01-18 | 2012-07-17 | Siemens Energy, Inc. | Weldability of alloys with directionally-solidified grain structure |
| WO2008031210A1 (en) * | 2006-09-15 | 2008-03-20 | Algoma Steel Inc. | Method for manufacturing a welded assembly |
| CN111094824A (en) * | 2017-09-22 | 2020-05-01 | 三菱日立电力***株式会社 | Method for setting cooling temperature of metal wall and method for cooling metal wall |
| CN111094824B (en) * | 2017-09-22 | 2021-11-23 | 三菱动力株式会社 | Method for setting cooling temperature of metal wall and method for cooling metal wall |
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