WO2004046392A1 - 鋼構造物の遅れ破壊防止方法および鋼構造物の製造方法 - Google Patents
鋼構造物の遅れ破壊防止方法および鋼構造物の製造方法 Download PDFInfo
- Publication number
- WO2004046392A1 WO2004046392A1 PCT/JP2003/014334 JP0314334W WO2004046392A1 WO 2004046392 A1 WO2004046392 A1 WO 2004046392A1 JP 0314334 W JP0314334 W JP 0314334W WO 2004046392 A1 WO2004046392 A1 WO 2004046392A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel structure
- steel
- delayed fracture
- stress
- stress concentration
- Prior art date
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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
Definitions
- the present invention relates to a method for preventing delayed fracture of a steel structure having a tensile strength of 600 N / mm 2 or more and Z or a welded joint of the steel, and a method for manufacturing a steel structure using the same. About the method.
- Hydrogen in steel structures such as high-strength ports and crankshafts and structures such as ships, bridges, and buildings reduces the toughness of steel structures.
- Hydrogen in the molten steel can be sufficiently reduced by lengthening the degassing time, but the longer processing time increases the processing cost, and the time required for the continuous manufacturing cycle. Therefore, there is a limit to the degassing time.
- a more sufficient drop in hydrogen concentration can be achieved by increasing the interval between slabs immediately after This can be done by keeping the heat by opening, stacking, covering with a force par, etc., prolonging the time in the high temperature state, and diffusing the hydrogen in the slab to the surface to eliminate it.
- a thick slab takes a long time to diffuse hydrogen, so that it needs to be left for several days or more, and the temperature of the slab decreases.
- Hot charging or direct rolling in which a hot slab immediately after embedding is immediately adjusted to the required temperature without cooling and rolled to product dimensions, has come to be used.
- the hydrogen remaining in the steel during the manufacturing process is rolled without being sufficiently removed, and becomes a steel plate shape.
- hydrogen In the cooling process after rolling, hydrogen must be released and lowered while the temperature is high during cooling. The risk of reduced toughness and delayed fracture due to hydrogen increases.
- US Pat. No. 6,171,415 discloses a method for improving fatigue strength by applying ultrasonic vibration to a welded joint. The use of sonic vibration to prevent delayed destruction of steel structures is not disclosed.
- the present invention solves the problems of the prior art as described above, and a method for preventing delayed fracture of a steel structure, which can prevent delayed fracture generated in a stress concentrated portion of the steel structure. It is an object to provide a manufacturing method.
- the present invention has been made as a result of diligent studies in order to solve the above-mentioned problems, and has been achieved by performing an ultrasonic impact treatment in which a surface of a stress concentration portion of a steel structure is hit with an ultrasonic vibration terminal.
- the present invention is characterized by preventing delayed fracture occurring at a stress concentration portion of a steel structure.
- a method for preventing delayed rupture of steel structures comprising applying an ultrasonic impact treatment in which an ultrasonic vibration terminal having a tip having a diameter of 1 to 5 mm is used.
- FIG. 1 is a diagram showing an embodiment in which the delayed fracture prevention method of the present invention is applied to a high tension port.
- FIG. 2 is a diagram showing an embodiment in which the delayed fracture prevention method of the present invention is applied to a steel plate on which a tensile stress acts.
- FIG. 3 is a diagram showing an embodiment in which the delayed fracture prevention method of the present invention is applied to an intersection of a plurality of welding lines.
- FIG. 4 is a diagram showing details of an intersection of a plurality of welding lines shown in FIG.
- FIG. 1 shows an embodiment in which the delayed fracture prevention method of the present invention is applied to a high tension port.
- the starting point of this fatigue fracture is caused by the internal stress existing around the inclusions, and the hydrogen existing in the steel material gathers around the inclusions, deteriorating the local fracture resistance, and occurring under small cyclic stress. It is an area called “fitssure” formed by cracks.
- This phenomenon is generally the case is a phenomenon which Mila 8 0 0 NZ mm 2 or more high-strength steel, the welded joint including a large amount of hydrogen, which is also a problem in 6 0 0 N / mm 2 class intensity level There is.
- the inventors of the present invention have investigated the cause, and found that whether or not it is the starting point of fisheye is correlated with the consistency between the steel material and the inclusions, and the presence of the inclusions with large mismatches such as crystal lattices The starting point Found that there are many.
- the diameter of the tip portion of the ultrasonic vibration terminal is set to 1 to 5 mm. If the diameter is less than 1 mm, the effect of reducing the internal stress is limited only to inclusions having a depth of 1 mm from the surface of the steel material. If it exceeds 5 mm, it is too large to accurately hit the stress concentration part.
- FIG. 2 shows an embodiment in which the delayed fracture prevention method of the present invention is applied to a steel plate on which a tensile stress acts.
- the 8 0 0 N / mm 2 grade steel sheet tensile stress acts, if in FIG. 2 shows Suyo open pore is provided, and cause stress concentration at the edge of the opening indicated by the lattice pattern, As in the first embodiment, hydrogen accumulates at the inclusions present in the stress concentration portion, deteriorating the local fracture resistance, cracking even under a small repetitive stress, and Is formed.
- the edge of the opening shown by the lattice pattern in Fig. 2 was subjected to ultrasonic impact treatment in which the tip of the opening was struck with an ultrasonic vibration terminal with a diameter of 1 to 5 mm. From the surface to a depth of about 3 mm Even in the vicinity of the TiN precipitate having a high internal stress existing in the range of, the internal stress can be eliminated so as not to be a starting point of the fish eye.
- FIG. 3 shows an embodiment in which the delayed fracture prevention method of the present invention is applied to an intersection of a plurality of welding lines.
- FIG. 4 is a detailed view of the intersection of the welding lines in FIG.
- the type of the ultrasonic generator used in the present invention is not limited, using a power supply of 200 W to 3 kW, the ultrasonic vibration of 19 kHz to 60 kHz is generated by the transducer, By amplifying with a wave guide, ⁇ ⁇ ⁇ !
- An apparatus that vibrates an ultrasonic vibration terminal composed of a pin of about 5 mm with an amplitude of 20 to 60 ⁇ m is preferable.
- the method for preventing delayed blasting shown in the first to third embodiments described above is applied to parts such as high-tensile bolts and crankshafts, and steel structures such as ships, bridges, and buildings, so that stress concentration parts Can reduce the stress in the steel and produce a steel structure in which inclusions do not become the starting point of fish
- this invention is a useful invention which can be utilized for the manufacturing industry of a steel structure.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003277681A AU2003277681A1 (en) | 2002-11-19 | 2003-11-11 | Delayed fracture prevention method for steel structure and steel structure manufacturing method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-334513 | 2002-11-19 | ||
JP2002334513A JP2004167519A (ja) | 2002-11-19 | 2002-11-19 | 鋼構造物の遅れ破壊防止方法および鋼構造物の製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004046392A1 true WO2004046392A1 (ja) | 2004-06-03 |
Family
ID=32321731
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/014334 WO2004046392A1 (ja) | 2002-11-19 | 2003-11-11 | 鋼構造物の遅れ破壊防止方法および鋼構造物の製造方法 |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP2004167519A (ja) |
KR (1) | KR100676332B1 (ja) |
CN (1) | CN100457925C (ja) |
AU (1) | AU2003277681A1 (ja) |
WO (1) | WO2004046392A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6932876B1 (en) | 1998-09-03 | 2005-08-23 | U.I.T., L.L.C. | Ultrasonic impact machining of body surfaces to correct defects and strengthen work surfaces |
US6338765B1 (en) | 1998-09-03 | 2002-01-15 | Uit, L.L.C. | Ultrasonic impact methods for treatment of welded structures |
US20050145306A1 (en) * | 1998-09-03 | 2005-07-07 | Uit, L.L.C. Company | Welded joints with new properties and provision of such properties by ultrasonic impact treatment |
US7301123B2 (en) | 2004-04-29 | 2007-11-27 | U.I.T., L.L.C. | Method for modifying or producing materials and joints with specific properties by generating and applying adaptive impulses a normalizing energy thereof and pauses therebetween |
US7276824B2 (en) | 2005-08-19 | 2007-10-02 | U.I.T., L.L.C. | Oscillating system and tool for ultrasonic impact treatment |
KR101369221B1 (ko) * | 2007-06-01 | 2014-03-06 | 볼보 컨스트럭션 이큅먼트 에이비 | 작업장치의 용접부에 발생되는 잔류응력 제거방법 |
JP4987816B2 (ja) * | 2008-07-28 | 2012-07-25 | 新日本製鐵株式会社 | 溶接継手の疲労特性を改善する自動打撃処理方法及び自動打撃処理装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6479320A (en) * | 1987-09-19 | 1989-03-24 | Nippon Steel Corp | Improvement of material quality of metal for welding austenitic stainless steel |
JPH081514A (ja) * | 1994-06-16 | 1996-01-09 | Toshiba Corp | 原子炉内構造物の表面処理方法 |
JPH09234585A (ja) * | 1996-02-29 | 1997-09-09 | Mitsubishi Heavy Ind Ltd | 溶接残留応力の低減装置付き溶接装置 |
US6171415B1 (en) * | 1998-09-03 | 2001-01-09 | Uit, Llc | Ultrasonic impact methods for treatment of welded structures |
JP2003113418A (ja) * | 2001-10-04 | 2003-04-18 | Nippon Steel Corp | 疲労寿命向上処理法およびそれによる長寿命金属材 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5322843A (en) * | 1976-08-13 | 1978-03-02 | Nippon Steel Corp | Method of improving solidification structure of weld zone by use of ultrasonic oscillatory radiation |
JPS55144964A (en) * | 1979-04-17 | 1980-11-12 | Furukawa Alum Co Ltd | Manufacture of aluminum alloy wheel |
US6338765B1 (en) * | 1998-09-03 | 2002-01-15 | Uit, L.L.C. | Ultrasonic impact methods for treatment of welded structures |
-
2002
- 2002-11-19 JP JP2002334513A patent/JP2004167519A/ja active Pending
-
2003
- 2003-11-11 CN CNB2003801035328A patent/CN100457925C/zh not_active Expired - Lifetime
- 2003-11-11 AU AU2003277681A patent/AU2003277681A1/en not_active Abandoned
- 2003-11-11 WO PCT/JP2003/014334 patent/WO2004046392A1/ja active Application Filing
- 2003-11-11 KR KR1020057008894A patent/KR100676332B1/ko active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6479320A (en) * | 1987-09-19 | 1989-03-24 | Nippon Steel Corp | Improvement of material quality of metal for welding austenitic stainless steel |
JPH081514A (ja) * | 1994-06-16 | 1996-01-09 | Toshiba Corp | 原子炉内構造物の表面処理方法 |
JPH09234585A (ja) * | 1996-02-29 | 1997-09-09 | Mitsubishi Heavy Ind Ltd | 溶接残留応力の低減装置付き溶接装置 |
US6171415B1 (en) * | 1998-09-03 | 2001-01-09 | Uit, Llc | Ultrasonic impact methods for treatment of welded structures |
JP2003113418A (ja) * | 2001-10-04 | 2003-04-18 | Nippon Steel Corp | 疲労寿命向上処理法およびそれによる長寿命金属材 |
Also Published As
Publication number | Publication date |
---|---|
KR20050086710A (ko) | 2005-08-30 |
KR100676332B1 (ko) | 2007-02-02 |
JP2004167519A (ja) | 2004-06-17 |
AU2003277681A1 (en) | 2004-06-15 |
CN1711365A (zh) | 2005-12-21 |
CN100457925C (zh) | 2009-02-04 |
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