WO2006104261A1 - 高強度厚鋼板およびその製造方法、ならびに高強度鋼管 - Google Patents
高強度厚鋼板およびその製造方法、ならびに高強度鋼管 Download PDFInfo
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- WO2006104261A1 WO2006104261A1 PCT/JP2006/307285 JP2006307285W WO2006104261A1 WO 2006104261 A1 WO2006104261 A1 WO 2006104261A1 JP 2006307285 W JP2006307285 W JP 2006307285W WO 2006104261 A1 WO2006104261 A1 WO 2006104261A1
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Definitions
- the present invention relates to a thick steel plate for high-strength line pipe used for transportation of natural gas and crude oil, and a method for producing the same.
- it when cutting by shearing, it has excellent crack resistance against cutting, high toughness, especially excellent DWTT (Drop Weight Tear Test) characteristics, and yield ratio (yield strength divided by tensile strength). Value) 0.85 or less, and a tensile strength of 900 MPa or more, a low-yield-ratio high-strength linepipe steel sheet, a manufacturing method thereof, and a high-strength steel pipe manufactured using the same.
- DWTT Dens Weight Tear Test
- Patent Document 2 discloses a technology related to accelerated cooling + aging heat treatment conditions for strengthening using Cu precipitation strengthening. Furthermore, Patent Document 3 shows a low yield ratio by providing an appropriate area fraction of the second phase structure according to the ratio between the tube thickness and the outer diameter, and is excellent in compression local buckling resistance. Steel pipes are disclosed.
- Patent Document 2 when heat treatment is performed after accelerated cooling, the hydrogen in the steel is sufficiently diffused, so that cutting cracks can be suppressed, but the heat treatment process does not enter the mouthpiece structure. The cementite precipitates and becomes coarse, and the toughness decreases. In particular, the DWT T (Drop Weight Tear Test) characteristic, which evaluates the brittle crack propagation stop characteristics, deteriorates. Further, since Patent Document 2 is not directed to having high deformability, a material having a yield ratio of 0.85 or less has not been obtained.
- Patent Document 3 is a high-level technology that does not lead to cracking even if a large deformation occurs in the line pipe due to ground deformation in a large earthquake or frozen land as described in that document.
- the aim is to reduce the yield ratio (YR), which is the yield strength divided by the tensile strength. Because it has low Charpy absorption energy, Of crack propagation in ductile fracture caused by a natural accident (in brittle fracture tests, a static or dynamic load is applied to a specimen or specimen that has been cut or replaced. In this test, a brittle crack is generated by an impact load and the propagation stop characteristic of brittle fracture at each temperature is obtained.)
- one phase is a ferrite structure, it is not possible to obtain a bow I tension strength of 900 MPa or more.
- Patent Document 1 Japanese Patent Laid-Open No. 2 0 0 3-2 9 3 0 8 9
- Patent Document 2 Japanese Patent Laid-Open No. 08-8-3 1 1 5 4 8
- Patent Document 3 Japanese Patent Application Laid-Open No. 09-184.
- the present invention has been made in view of such circumstances, and is a high-strength thick steel plate and high-strength steel tube that can be sheared without causing cutting cracks and used as a line pipe.
- High strength steel sheet with the first objective of giving it a low yield ratio so that cracks due to local buckling will not occur even if large deformations due to ground deformation such as a large earthquake occur during High strength thick steel with good tensile cracking resistance, excellent Charpy absorption energy and DWTT characteristics, and low yield ratio of 0.85% or less, tensile strength of 900 MPa or more It aims at providing a board, its manufacturing method, and a high strength steel pipe.
- the Charpy absorbed energy which is an index for evaluating the crack propagation stopping performance of ductile fracture, is the same strength level of painite martensite single-phase structure steel.
- the desired Ral-Charpy absorbed energy can be obtained. It is possible to level.
- the average particle size of cementite existing in hard paynite and Z or martensite is 0.5 jUm or less, the DWTT property, which is an indicator of brittle crack propagation stopping performance, is excellent.
- cementite can be maintained in such a fine state even when heated to a temperature range of 300 ° C or higher after accelerated cooling, and the D WTT characteristics are excellent.
- the present invention has been completed by further studies based on the above knowledge, and provides the following (1) 1 (5).
- High strength thick steel plate includes:
- the content of Ca, 0, S satisfies the following formula (1), and the balance consists of Fe and inevitable impurities, and 1 ⁇ (1 -130X [0]) X [Ca] / ( 1. 25 X [S]) ⁇ 3 to (1)
- [0], [Ca], [S] are the contents of each element in steel (mass%).
- -Average particle size of cementite in bainite and / or martensite is less than 0.5 m
- the high-strength thick steel plate according to item (1) above further includes:
- a method for producing a high strength thick steel plate includes:
- the average heating rate is 5 ° CZs or higher and reheating to a temperature of 300 ° C or higher and 450 ° C or lower.
- High-strength steel pipe consists of:
- high strength means a tensile strength of 900 MPa or more
- high toughness means a Charbi absorption energy of 200 J or more at a test temperature of 30 ° C and brittleness in DWTT at a test temperature of 30 ° C.
- the fracture surface ratio is 750/0 or more
- the low yield ratio is 0.85 or less.
- the thick steel plate targeted in the present invention is a steel plate having a thickness of 10 mm or more.
- a high strength thick steel plate having good cut cracking resistance, excellent Charpy absorption energy and DWTT characteristics, a low yield ratio of 0.85 or less, and a tensile strength of 9 OOMPa or more. It can be obtained and is extremely useful industrially.
- c contributes to an increase in strength by forming a supersaturated solid solution in a low temperature transformation structure.
- it is necessary to contain 0.030 / 0 or more.
- the amount exceeds 0.1 2 o / o , when the pipe is processed, The hardness increases remarkably and weld cold cracking is likely to occur. Therefore, the C content is set to 0.03-0.12%.
- Si Preferably, 0.01 to 0.5% or less
- Si acts as a deoxidizer, and further increases the strength of the steel by solid solution strengthening, but if its amount is less than 0.01%, the effect cannot be obtained, and if it exceeds 0.5% Toughness is significantly reduced. Therefore, the Si content is set to 0 ⁇ 01 to 0.5%.
- Mn Preferably, 1.5 to 3%
- Mn acts as a hardenability improving element. The effect is exhibited when the amount is 1.5% or more. However, in the continuous forging process, if the concentration increase in the central segregation part exceeds 30/0, it causes delayed fracture in the segregation part. For this reason, the Mn content is in the range of 1.5 to 3%.
- AI Preferably, 0. 01 -0. 08%
- AI acts as a deoxidizing element.
- a sufficient deoxidation effect can be obtained at a content of 0.01 ° / o or more.
- the content exceeds 0.08%, the cleanliness in the steel is lowered, and the toughness is deteriorated. Therefore, the AI content is set to 0.01 -0.0.08%.
- Nb Preferably, 0.01 to 0.08% Nb has the effect of expanding the austenite non-recrystallized region during hot rolling.
- Nb is contained in an amount of 0.01% or more in order to make the non-recrystallized region below 950 ° C. If the amount exceeds 0.08%, the toughness of the HAZ when welded is significantly impaired. Therefore, the Nb content is set to 0.01 -0.0.08%.
- the pinning effect of precipitated TiN suppresses the austenite grain coarsening, thereby improving the toughness of the base material and HAZ.
- the content In order to obtain the necessary pinning effect, the content must be 0.005% or more, but when it exceeds 0.025%, carbides are formed, and the toughness is remarkably increased by precipitation hardening. It will deteriorate. Therefore, the Ti content is set to 0.005 to 0.025%.
- N Preferably, 0.001 to 0.01 0/0
- N is usually present as an inevitable impurity in steel, but as described above, adding TiCl forms TiN that suppresses coarsening of austenite grains.
- the content needs to be 0.001% or more, but if it exceeds 0.01%, it is 1450 ° C or more near the weld, especially in the vicinity of the melting line.
- TiN is decomposed by HAZ heated at a low temperature, and the negative effect of solid solution N becomes significant. Therefore, the N content is set to 0.001 to 0.01%.
- Cu Preferably, 0.01 to 2 0 / o
- Cu contributes to improving the hardenability of steel at 0.01% or more. However, if the content exceeds 2%, the toughness deteriorates. For this reason, when adding Cu, the content is made 0.01-2%.
- Ni Preferably, 0.01-3 0 / o
- Ni contributes to improving the hardenability of steel by adding 0.01% or more. In particular, even if added in a large amount, it does not cause toughness deterioration, so it is effective for toughening. For this reason, when adding Ni, the content is made 0.01 to 3%.
- the Cr content of 0.1% or more contributes to improving the hardenability of the steel, but if it exceeds 1%, the toughness deteriorates. For this reason, when adding Cr, the content is made 0.01 to 1%.
- Mo also contributes to improving the hardenability of steel by containing 0 ⁇ 01 0/0 or more. If this value is exceeded, the toughness deteriorates. For this reason, when adding Mo, the content is made 0.01 to 1%.
- V Preferably, 0.01 to 0.1%
- V strengthens precipitation by forming carbonitride, and contributes to prevention of softening of the heat affected zone. This effect is obtained at 0.01 / 0/0 or more. However, if it exceeds 0. "
- the Ca content is set to 0.0005 to 0.01%.
- o and S are inevitable impurities and define the upper limit of the content.
- the content of o is 0.003% or less from the viewpoint of suppressing the formation of inclusions that are coarse and adversely affect toughness.
- MnS formation is suppressed by adding, MnS cannot be suppressed even by morphological control with Ca if the content of S is large, so the content is made 0.001% or less.
- this parameter formula defines the relationship between 0, S content and Ca content in steel. By satisfying this range, it is coarse and adversely affects toughness. In addition to suppressing the formation of inclusions, it suppresses the coarsening of CaO'CaS generated by the addition of excess Ca to prevent a decrease in Charbi absorption energy. This will be specifically described below.
- Ca has the ability to form sulfides, and when added, suppresses the formation of MnS, which lowers the Charbi absorption energy in the molten steel during steelmaking, and forms CaS that is relatively harmless to toughness instead.
- Ca is also an oxide-forming element, it is necessary to first add an amount that allows for consumption as an oxide.
- the effective CaO content (Ca *) excluding CaO generation was tested after setting O ⁇ 0.003% and S ⁇ 0.001%.
- [0], [Ca], [S] in the above formulas (1) and (a) to (c) are the contents of each element in steel (mass 0 / o).
- REM forms oxysulfide in steel and contains 0.0005% or more to provide a pinning effect that prevents the weld heat affected zone from becoming coarse.
- it is an expensive element and the effect is saturated even if it exceeds 0.020 / 0. For this reason, when adding REM, the content is made 0.0005-0.02%.
- Zr forms carbonitrides in steel and has a pinning effect that suppresses austenite grain coarsening, particularly in the heat affected zone.
- a sufficient pinning effect addition of 0.0005% or more is necessary, but if it exceeds 0.03%, the cleanliness in the steel is remarkably lowered and the toughness is lowered. For this reason, when adding Zr, the content is made 0.0005-0.03%.
- Mg 0.005% to 0.01%
- Mg is produced as fine oxides in the steel during the steelmaking process, and has a pinning effect that suppresses the coarsening of austenite grains, particularly in the heat affected zone.
- addition of 0.0005% or more is necessary. However, if it exceeds 0.01 o / o, the cleanliness in the steel is remarkably lowered and the toughness is lowered. For this reason, when adding Mg, the content is made 0.0005-0.01%.
- Either ferrite + bainite, ferrite + martensite, or ferrite + bainite + martensite is 90% or more in area fraction
- the hard phase is bainite, martensite, or a mixed structure thereof.
- it should be either ferrite 10 banite, ferrite + martensite, or ferrite + bainite + martensite.
- the desired strength and yield ratio can be obtained. Desirably, it is 950/0 or higher. That is, the presence of less than 10% residue, island martensite, pearlite, etc. is allowed.
- the bainite and / or martensite constituting the hard phase have a structure transformed from fine-grained austenite having a thickness direction thickness of 30 m or less.
- the ferrite When the ferrite is less than 1 Oo / o, the behavior is almost the same as that of bainite or martensite single-phase structure, and the yield strength remains high, making it difficult to achieve the desired low yield ratio.
- the ferrite content exceeds 50%, soft ferrite is the main component and tensile strength is increased. The degree is greatly reduced and it becomes difficult to achieve a high strength exceeding 900 MPa.
- it is 10 to 30%. By setting it to 30% or less, a high tensile strength can be stably obtained.
- the ferrite has an average grain size of 20 jum.
- Average particle size of cementite in bainite and Z or martensite is 0.5 ⁇ m or less
- the average particle size of cementite cake in bainite and / or martensite is 0.5 / m or less.
- the average particle size of cementite is preferably 0.2 jU m or less.
- the average particle diameter of cementite rice cake is measured using the following method. First, a sample for microstructure observation was collected parallel to the cross section in the plate rolling direction, mirror-polished, speed-etched, and then observed with a scanning electron microscope. Take a photomicrograph. From this micrograph, the equivalent circle diameter of each cementite particle is calculated by image analysis, and the average value is calculated.
- Nb, Ti, Mo and V contained in a single carbide containing one of Nb, Ti, Mo and V present in steel or in a composite carbide containing two or more of these is contained in steel. Less than 10% of the total of Nb, ⁇ , Mo and V contained (at mass 0 / ⁇ ).
- Nb, Ti, Mo and V carbides precipitate in the steel in addition to cementite.
- Precipitation strengthening occurs when the total amount of carbides precipitated from these elements exceeds 100/0 of the content in these steels, and in particular, the target value of low yield ratio is achieved by increasing the yield strength. It becomes difficult to do. Therefore, the amount of carbides forming these carbide forming elements is set to 10% or less.
- Heating temperature 1 000 ⁇ 1 200 ° C
- heating temperature shall be 1000-1200 degreeC.
- the rolling end temperature is lower than the Ar 3 point, rolling is performed in the ferrite transformation temperature range, and the ferrite produced by transformation is processed greatly, and the Charpy absorbed energy is reduced.
- the rolling is finished at a temperature higher than Ar 3 point + 100 ° C, the effect of refining by austenite non-recrystallization zone rolling becomes insufficient.
- the austenite refinement effect by the austenite non-recrystallized region rolling can be sufficiently secured by terminating the rolling in the range of Ar 3 points or more and Ar 3 points + 100 ° C. or less. For this reason, the rolling end temperature is set to Ar 3 points or more and Ar 3 points + 100 ° C. or less.
- Cooling start temperature for accelerated cooling Ar 3 point one 50 ° C or more, less than Ar 3 point
- the cooling start temperature of accelerated cooling is set to less than Ar 3 points.
- the cooling start temperature is set to less than 50 ° C for Ar 3 points, the area ratio of the Ferai woven fabric exceeds 50% and the required tensile strength cannot be ensured, so the lower limit is set to Ar 3 points.
- the cooling start temperature is set to less than 50 ° C for Ar 3 points, the area ratio of the Ferai woven fabric exceeds 50% and the required tensile strength cannot be ensured, so the lower limit is set to Ar 3 points.
- the cooling rate here refers to the average cooling rate (the value obtained by dividing the difference between the cooling start temperature and the cooling stop temperature by the required time) at the center of the plate thickness Cooling stop temperature for accelerated cooling: 250 ° C or less
- the stop temperature of accelerated cooling is lowered to generate bainitic and martensitic structures that transform at low temperatures. If the cooling stop temperature exceeds 250 ° C, the accelerated cooling stops with insufficient transformation, and the remaining untransformed structure becomes rough and causes a decrease in toughness. Therefore, the cooling stop temperature should be 250 ° C or less.
- the reheating treatment method may be either furnace heating or induction heating. This reheating treatment condition is an important condition for obtaining the characteristics of the steel sheet of the present invention. Heating temperature: 300 ⁇ 450 ° C
- the reheating temperature When the reheating temperature is less than 300 ° C, hydrogen does not diffuse sufficiently and cutting cracks cannot be prevented, so the reheating temperature should be 300 ° C or higher. On the other hand, since it is necessary to suppress the increase in yield strength in order to obtain a yield ratio of 0.85 or less, the precipitation amount of Nb, Ti, Mo, and V carbides does not increase during reheating so that precipitation strengthening does not increase.
- the upper limit temperature is 450 ° C. Average heating rate: 5 ° CZs or more
- the heating rate is 5 ° CZs or more.
- the rate of temperature increase refers to the average rate of temperature increase at the center of the plate thickness (a value obtained by dividing the difference between the reheating start temperature and the reheating temperature by the required time). Reheating start time: Immediately after stopping reheating and cooling.
- the heating start time is preferably within 300 seconds after stopping accelerated cooling, more preferably within 100 seconds.
- the high-strength thick steel plate of the present invention as described above can be formed into a high-strength steel pipe used for a line pipe or the like by forming into a pipe according to a conventional method and welding the end.
- Steel sheets A to K were produced using the steel having the chemical composition shown in Table 1 under the hot rolling “accelerated cooling” reheating conditions shown in Table 2. Reheating was performed using an induction heating type heating device installed on the same line as the accelerated cooling equipment.
- the obtained steel plate was cut at 20 locations with a shearing machine, and then the cut surface of the steel plate was investigated by magnetic particle flaw detection to determine the number of cut end faces where cut cracks were observed.
- the number of cut cracks was set to 1 because there was only one edge. A case where no cut cracks were observed at all cut points (number of occurrence of cut cracks 0) was considered good.
- Examples 1 to 8 of the present invention in which the chemical composition and rolling'cooling and reheating conditions are within the scope of the present invention, showed no cracking and exhibited high strength, high toughness and a low yield ratio.
- the comparative example outside the scope of the present invention was inferior in any of these characteristics. Specifically, in Comparative Example No. 9 having a rolling end temperature lower than the range of the present invention, the strength decreased because the fraction of the ferrite structure increased. Further, in Comparative Example No. 10 where the cooling start temperature is higher than the range of the present invention, the Charlie absorption energy and the DWTT characteristic with a high yield ratio were lowered because the Ferai transformation at Ar 3 or less did not occur. In Comparative Example No.
- Comparative Example No. 1 where the time until reheating started exceeded 300 seconds, a fracture occurred.
- Comparative Example No. 14 where the reheating temperature was lower than the range of the present invention, since the heating temperature was too low and sufficient dehydrogenation did not occur, many cutting cracks occurred.
- Comparative Example No. 15 where the reheating temperature was higher than the range of the present invention, the yield of carbide increased and the yield ratio (YR) increased due to precipitation strengthening.
- Comparative Example No. 16 using steel type G in which the C content of the steel sheet is higher than the range of the present invention, showed high strength, the density of cementite became too high, and cut cracks occurred. Charpy absorbed energy was also low. Comparative Example No.
- It provides a high-strength steel plate with DWTT characteristics and a low yield ratio of 0 ⁇ 85 or less and a tensile strength of 900 MPa or more, and is suitable for line pipes for the transportation of natural gas and crude oil.
Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/887,018 US8758528B2 (en) | 2005-03-31 | 2006-03-30 | High-strength steel plate, method of producing the same, and high-strength steel pipe |
CA2602728A CA2602728C (en) | 2005-03-31 | 2006-03-30 | High-strength steel plate, method of producing the same, and high-strength steel pipe |
KR1020077018446A KR100934405B1 (ko) | 2005-03-31 | 2006-03-30 | 고강도 후강판 및 그의 제조 방법, 및 고강도 강관 |
EP06731233.0A EP1870484B1 (en) | 2005-03-31 | 2006-03-30 | High-strength steel plate and process for production thereof, and high-strength steel pipe |
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JP2005-103090 | 2005-03-31 | ||
JP2005103090 | 2005-03-31 | ||
JP2006089276A JP4997805B2 (ja) | 2005-03-31 | 2006-03-28 | 高強度厚鋼板およびその製造方法、ならびに高強度鋼管 |
JP2006-089276 | 2006-03-28 |
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WO2006104261A1 true WO2006104261A1 (ja) | 2006-10-05 |
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PCT/JP2006/307285 WO2006104261A1 (ja) | 2005-03-31 | 2006-03-30 | 高強度厚鋼板およびその製造方法、ならびに高強度鋼管 |
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US (1) | US8758528B2 (ja) |
EP (1) | EP1870484B1 (ja) |
JP (1) | JP4997805B2 (ja) |
KR (1) | KR100934405B1 (ja) |
CA (1) | CA2602728C (ja) |
WO (1) | WO2006104261A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US8361249B2 (en) | 2006-12-15 | 2013-01-29 | Kobe Steel, Ltd. | High-strength steel plate resistant to strength reduction resulting from stress relief annealing and excellent in weldability |
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JP4959402B2 (ja) * | 2007-03-29 | 2012-06-20 | 新日本製鐵株式会社 | 耐表面割れ特性に優れた高強度溶接構造用鋼とその製造方法 |
JP4977876B2 (ja) * | 2007-03-30 | 2012-07-18 | Jfeスチール株式会社 | 母材および溶接部靱性に優れた超高強度高変形能溶接鋼管の製造方法 |
JP5079419B2 (ja) * | 2007-08-09 | 2012-11-21 | 新日本製鐵株式会社 | 溶接熱影響部の靱性が優れた溶接構造物用鋼とその製造方法および溶接構造物の製造方法 |
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Also Published As
Publication number | Publication date |
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CA2602728C (en) | 2011-10-25 |
US8758528B2 (en) | 2014-06-24 |
KR100934405B1 (ko) | 2009-12-29 |
JP4997805B2 (ja) | 2012-08-08 |
JP2006307334A (ja) | 2006-11-09 |
US20090120541A1 (en) | 2009-05-14 |
CA2602728A1 (en) | 2006-10-05 |
EP1870484A1 (en) | 2007-12-26 |
EP1870484B1 (en) | 2014-11-12 |
EP1870484A4 (en) | 2011-08-17 |
KR20070094846A (ko) | 2007-09-21 |
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