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WO2016079920A1 - Tuyau sans soudure en acier inoxydable à haute résistance pour des puits de pétrole - Google Patents

Tuyau sans soudure en acier inoxydable à haute résistance pour des puits de pétrole Download PDF

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Publication number
WO2016079920A1
WO2016079920A1 PCT/JP2015/005175 JP2015005175W WO2016079920A1 WO 2016079920 A1 WO2016079920 A1 WO 2016079920A1 JP 2015005175 W JP2015005175 W JP 2015005175W WO 2016079920 A1 WO2016079920 A1 WO 2016079920A1
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Prior art keywords
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stainless steel
strength
content
steel pipe
Prior art date
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PCT/JP2015/005175
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English (en)
Japanese (ja)
Inventor
江口　健一郎
石黒　康英
鈴木　健史
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JFE Steel Corp
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JFE Steel Corp
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Priority to JP2016503261A priority Critical patent/JP6237873B2/ja
Publication of WO2016079920A1 publication Critical patent/WO2016079920A1/fr
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Classifications

    • 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
    • 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
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a high-strength stainless steel seamless pipe suitable for use in oil wells or gas wells (hereinafter also simply referred to as oil wells) for crude oil or natural gas, and in particular, carbon dioxide (CO 2 ), chlorine ions (Cl ⁇ ) In high-temperature corrosive environments and in environments containing hydrogen sulfide (H 2 S).
  • oil wells oil wells or gas wells
  • CO 2 carbon dioxide
  • Cl ⁇ chlorine ions
  • 13Cr martensitic stainless steel pipes have been generally used as oil well pipes used for mining in oil fields and gas fields in an environment containing CO 2 , Cl 2 ⁇ and the like. Recently, however, the development of oil wells under corrosive environments of even higher temperatures (up to 200 ° C) has been underway, and in such environments, 13Cr martensitic stainless steels sometimes lacked corrosion resistance. It was. For this reason, there has been a demand for an oil well steel pipe having excellent corrosion resistance that can be used in such an environment.
  • a high-strength stainless steel with excellent corrosion resistance and having a structure containing a martensite phase as a base phase and a ferrite phase in a volume ratio of 10 to 60%, or an austenite phase in a volume ratio of 30% or less.
  • Steel pipes are described.
  • CO 2 also exhibits sufficient corrosion resistance in high temperature harsh corrosive environments to 230 ° C. containing, yield strength: 654MPa for oil wells stainless steel tube further has a high toughness and high strength of greater than (95 ksi) Can be manufactured stably.
  • Patent Document 2 describes a high-strength stainless steel pipe for oil wells having high toughness and excellent corrosion resistance.
  • C 0.04% or less
  • Si 0.50% or less
  • Mn 0.20 to 1.80%
  • P 0.03% or less
  • S 0.005% or less
  • Cr 15.5 to 17.5 %
  • Ni 2.5 to 5.5%
  • V 0.20% or less
  • Mo 1.5 to 3.5%
  • W 0.50 to 3.0%
  • Al 0.05% or less
  • N 0.15% or less
  • Cr, Mo, W and C satisfy a specific relationship
  • Cr, Mo, W, Si, C, Mn, Cu, Ni and N satisfy a specific relationship
  • Mo and W satisfy a specific relationship.
  • a steel pipe having a composition comprising the balance Fe and inevitable impurities and a structure containing a martensite phase as a base phase and a ferrite phase containing 10 to 50% by volume is obtained.
  • Patent Document 3 describes a high-strength stainless steel pipe excellent in resistance to sulfide stress cracking and high-temperature carbon dioxide gas corrosion.
  • C 0.05% or less
  • Si 1.0% or less
  • Cr 16% to 18%
  • Mo 2% to 3%
  • Cu 1 to 3.5%
  • Ni 3% or more and less than 5%
  • Al 0.001 to 0.1%
  • O 0.01% or less
  • Mn 1% or less
  • N 0.05% or less
  • Mn and N satisfy a specific relationship
  • the steel pipe has a structure including.
  • the yield strength is 758 MPa (110 ksi) or higher, and it has sufficient corrosion resistance even in a high-temperature carbon dioxide environment of 200 ° C. Sufficient sulfide stress even when the environmental gas temperature is lowered.
  • the stainless steel pipe is excellent in cracking and corrosion resistance.
  • Patent Document 4 describes a stainless steel pipe for oil wells.
  • C 0.05% or less
  • Si 0.5% or less
  • Mn 0.01 to 0.5%
  • P 0.04% or less
  • S 0.01% or less
  • Cr more than 16.0% by mass%
  • Mo 1.6 to 4.0%
  • Cu 1.5 to 3.0%
  • Al 0.001 to 0.10%
  • N 0.050% or less
  • (C + N), Mn, Ni, Cu and (Cr + Mo) satisfy a specific relationship, the composition comprising the balance Fe and unavoidable impurities, the martensite phase and the volume ratio of 10 to 40 % Of ferrite phase, the length of 50 ⁇ m in the thickness direction from the surface, and the ratio of the crossing of the phantom lines to a plurality of imaginary line segments arranged in a row in a range of 200 ⁇ m at a pitch of 10 ⁇ m is 85
  • Patent Document 5 describes a high-strength stainless steel pipe for oil wells having high toughness and excellent corrosion resistance.
  • C 0.04% or less
  • Si 0.50% or less
  • Mn 0.20 to 1.80%
  • P 0.03% or less
  • S 0.005% or less
  • Cr 15.5 to 17.5
  • V 0.20% or less
  • Mo 1.5 to 3.5%
  • W 0.50 to 3.0%
  • Al 0.05% or less
  • N 0.15% or less
  • Cr, Mo, W and C satisfy a specific relationship, Cr, Mo, W, Si, C, Mn, Cu, Ni and N, and Mo and W satisfy a specific relationship, respectively
  • the steel pipe has a composition containing the remaining Fe and inevitable impurities, and having a structure in which the distance between any two points in the grain is 200 ⁇ m or less in the largest crystal grain.
  • Patent Document 6 describes a high-strength martensitic stainless steel seamless steel pipe for oil wells.
  • C 0.01% or less
  • Si 0.5% or less
  • Mn 0.1 to 2.0%
  • P 0.03% or less
  • S 0.005% or less
  • Cr more than 15.5, 17.5% by mass %: Ni: 2.5-5.5%
  • Mo 1.8-3.5%
  • Cu 0.3-3.5%
  • V 0.20% or less
  • Al 0.05% or less
  • N 0.06% or less
  • a seamless steel pipe having a composition comprising impurities, preferably containing a ferrite phase of 15% or more by volume or a residual austenite phase of 25% or less, and the balance being a tempered martensite phase.
  • yield strength 655 MPa or more 862MPa following high strength and yield ratio: has a 0.90 or more tensile properties, CO 2, Cl -, etc., further comprises H 2 S, 170 ° C. or more high temperature severe corrosion It is said that a high-strength martensitic stainless steel pipe having sufficient corrosion resistance (carbon dioxide corrosion resistance, sulfide stress corrosion cracking resistance) even in the environment can be stably produced.
  • oil well steel pipes have a high yield strength of 862 MPa (125 ksi) or higher and a high temperature of 200 ° C or higher.
  • Excellent carbon dioxide corrosion resistance, excellent sulfide stress corrosion cracking resistance, and excellent sulfide stress crack resistance even under severe corrosive environments including CO 2 , Cl ⁇ , and H 2 S There is a demand for maintaining excellent corrosion resistance in combination.
  • Patent Documents 1 to 6 contain a large amount of alloy elements in order to improve corrosion resistance. Therefore, these techniques have a problem that the Ms transformation point becomes low, and the high strength of yield strength: 125 ksi class as described above cannot be stably secured together with excellent corrosion resistance.
  • Patent Document 3 has a problem that it is necessary to substantially reduce N substantially in order to satisfy a specific relationship between Mn and N, resulting in an increase in manufacturing cost.
  • the high-strength stainless steel pipe described in Patent Document 3 has a problem that the corrosion resistance is lowered under a severe corrosive environment and cannot be applied.
  • the present invention solves such a problem of the prior art, and has excellent carbon dioxide gas corrosion resistance, excellent sulfide stress corrosion cracking resistance, and excellent sulfide resistance even under severe corrosion environment with high strength and high temperature.
  • An object of the present invention is to provide a high-strength stainless steel seamless steel pipe for oil wells that has stress cracking properties and excellent corrosion resistance.
  • “high strength” refers to a case where the yield strength is YS: a strength of 125 ksi (862 MPa) or higher.
  • Example carbon dioxide corrosion resistance refers to a test solution held in an autoclave: 20 mass% NaCl aqueous solution (liquid temperature: 200 ° C., 30 atmospheres CO 2 gas atmosphere). When the piece is immersed and the immersion time is 336 hours, the corrosion rate is 0.127 mm / y or less.
  • excellent sulfide stress corrosion cracking resistance refers to a test solution retained in an autoclave: 20% by mass NaCl aqueous solution (liquid temperature: 100 ° C., 30 atm CO 2 gas, 0.1 atm H 2 S atmosphere), the test piece was immersed in an aqueous solution adjusted to pH: 3.3 by adding acetic acid + Na acetate, the immersion time was set to 720 hours, and 100% of the yield stress was applied as the applied stress. The case where cracks do not occur in the later test piece shall be said.
  • excellent sulfide stress cracking resistance refers to a test solution: 20 mass% NaCl aqueous solution (liquid temperature: 25 ° C., 0.9 atm CO 2 gas, 0.1 atm H 2 S atmosphere), The test piece is immersed in an aqueous solution adjusted to pH 3.5 by adding acetic acid + Na acetate, the immersion time is set to 720 hours, 90% of the yield stress is applied as the load stress, and the test piece after the test is cracked. The case where it does not occur shall be said.
  • the present inventors have various effects on the Ms transformation point in order to obtain a high strength and corrosion resistance in a balanced and stable manner for a 17% Cr martensitic stainless steel pipe.
  • the effects of alloying elements were studied earnestly.
  • W and Nb are contained as essential components, and Nb, C, N and Mn are represented by the following formula (1): Nb-6C-2N-0.04Mn ⁇ ⁇ 0.145 (1) (Where Nb, C, N and Mn: content of each element (mass%)) It has been found that by adjusting and containing so as to satisfy the requirements, excellent corrosion resistance can be maintained even under severe corrosive environment and desired strength can be stably obtained.
  • the formula (1) is obtained experimentally by the present inventors, and adjusting the amounts of Nb, C, N and Mn so as to satisfy the formula (1) lowers the Ms transformation point. It has been found that it is important to stably obtain desired strength and further excellent corrosion resistance.
  • the gist of the present invention is as follows. (1) In mass%, C: 0.012 to 0.05%, Si: 1.0% or less, Mn: 0.1 to 0.5%, P: 0.05% or less, S: less than 0.005%, Cr: 16.0% to 18.0% or less, Mo: 2.0% to 4.0%, Ni: 3.0% to less than 5.0%, Cu: 0.5 to 2.0%, W: 0.01 to 3.0%, Nb: 0.02 to 0.5%, Al: 0.001 to 0.1%, N: 0.012 to 0.07% , O: 0.01% or less, and Nb, C, N and Mn as follows: (1) Formula Nb-6C-2N-0.04Mn ⁇ -0.145 (1) (Where Nb, C, N, Mn: content of each element (mass%)) And a composition comprising the balance Fe and inevitable impurities, a tempered martensite phase with a volume fraction of 50% or more, a ferrite phase with a volume
  • the yield strength high strength of 862 MPa or higher, high temperature of 200 ° C. or higher, and excellent carbon dioxide resistance even in a severe corrosive environment containing CO 2 , Cl ⁇ , and H 2 S.
  • High-strength stainless steel seamless steel pipes for oil wells that combine corrosion resistance, excellent sulfide stress corrosion cracking resistance, and excellent sulfide stress crack resistance with excellent corrosion resistance can be obtained easily and stably. It has a remarkable industrial effect.
  • the high strength stainless steel seamless steel pipe for oil wells of the present invention is in mass%, C: 0.012 to 0.05%, Si: 1.0% or less, Mn: 0.1 to 0.5%, P: 0.05% or less, S: less than 0.005%, Cr : 16.0% to 18.0%, Mo: 2.0% to 4.0%, Ni: 3.0% to less than 5.0%, Cu: 0.5 to 2.0%, W: 0.01 to 3.0%, Nb: 0.02 to 0.5%, Al: 0.001 -0.1%, N: 0.012-0.07%, O: 0.01% or less, and Nb-6C-2N-0.04Mn ⁇ -0.145 (where Nb, C, N and Mn are contained so as to satisfy the content (mass%) of each element), and have a composition composed of the balance Fe and inevitable impurities, and a tempered martens exceeding 50% by volume.
  • C 0.012-0.05%
  • C is an element that lowers the Ms point and forms carbides to lower the corrosion resistance. For this reason, C content needs to be reduced to 0.05% or less. On the other hand, reduction of the C content to less than 0.012% leads to an increase in refining costs. Therefore, the C content is limited to 0.012 to 0.05%. Preferably, the C content is 0.020 to 0.040%.
  • Si 1.0% or less
  • Si is an element that acts as a deoxidizing agent. In order to obtain such an effect, it is desirable to contain 0.005% or more of Si.
  • Si content was limited to 1.0% or less.
  • the Si content is 0.1 to 0.6%. More preferably, the Si content is 0.10 to 0.30%.
  • Mn 0.1-0.5%
  • Mn is an element that increases the strength of martensitic stainless steel, and needs to contain 0.1% or more of Mn in order to ensure a desired strength.
  • the Mn content exceeds 0.5%, the toughness decreases. Therefore, the Mn content is limited to the range of 0.1 to 0.5%. More preferably, the Mn content is 0.15 to 0.30%.
  • P 0.05% or less
  • P is an element that lowers corrosion resistance such as carbon dioxide corrosion resistance and sulfide stress cracking resistance, and is preferably reduced as much as possible in the present invention, but the P content should be 0.05% or less. Acceptable. For these reasons, the P content is limited to 0.05% or less. Preferably, the P content is 0.02% or less.
  • S Less than 0.005% S is an element that significantly reduces the hot workability and hinders the stable operation of the seamless steel pipe manufacturing process, and is preferably reduced as much as possible, but if the S content is less than 0.005% This makes it possible to produce seamless steel pipes in the normal process. For this reason, the S content is limited to less than 0.005%. Preferably, the S content is 0.002% or less.
  • Cr 16.0% to 18.0% or less Cr is an element that contributes to improving corrosion resistance by forming a protective film. If it is 16.0% or less, the desired corrosion resistance cannot be ensured, so it is necessary to contain more than 16.0% Cr. To do. On the other hand, if the Cr content exceeds 18.0%, the ferrite fraction becomes too high and the desired strength cannot be ensured. For this reason, the Cr content is limited to the range of more than 16.0% and less than 18.0%. Preferably, the Cr content is 16.2 to 17.5%.
  • Mo 2.0% to 4.0% Mo stabilizes the protective film, increases resistance to pitting corrosion due to Cl - and low pH, and improves resistance to sulfide stress cracking and resistance to sulfide stress corrosion It is an element. In order to acquire such an effect, it is necessary to contain Mo exceeding 2.0%. On the other hand, Mo is an expensive element. If Mo content exceeds 4.0%, the material cost increases, and the toughness and the resistance to sulfide stress corrosion cracking decrease. For this reason, the Mo content is limited to more than 2.0% and not more than 4.0%. More preferably, the Mo content is 2.2 to 3.0%.
  • Ni 3.0% or more and less than 5.0%
  • Ni is an element that strengthens the protective film and contributes to the improvement of corrosion resistance. Ni also increases the strength of the steel by solid solution strengthening. Such an effect becomes remarkable when the Ni content is 3.0% or more.
  • the Ni content of 5.0% or more decreases the stability of the martensite phase and decreases the strength. For this reason, Ni content was limited to 3.0% or more and less than 5.0%.
  • the Ni content is 3.5 to 4.5%.
  • Cu 0.5-2.0%
  • Cu is an element that strengthens the protective film and suppresses hydrogen intrusion into the steel and improves the resistance to sulfide stress cracking and the resistance to sulfide stress corrosion cracking. In order to acquire such an effect, 0.5% or more of content is required. On the other hand, if Cu is contained in excess of 2.0%, the effect is saturated, and an effect commensurate with the content cannot be expected, which is economically disadvantageous. Therefore, the Cu content is limited to the range of 0.5 to 2.0%. Preferably, the Cu content is 0.5 to 1.5%.
  • W 0.01-3.0% W is an important element in the present invention that contributes to improving the strength of the steel and stabilizes the protective film to increase the resistance to sulfide stress cracking and the resistance to sulfide stress corrosion cracking.
  • W is an important element in the present invention that contributes to improving the strength of the steel and stabilizes the protective film to increase the resistance to sulfide stress cracking and the resistance to sulfide stress corrosion cracking.
  • W is an important element in the present invention that contributes to improving the strength of the steel and stabilizes the protective film to increase the resistance to sulfide stress cracking and the resistance to sulfide stress corrosion cracking.
  • the resistance to sulfide stress cracking is particularly improved.
  • it is necessary to contain 0.01% or more of W.
  • the inclusion of a large amount of W exceeding 3.0% reduces toughness. For this reason, W is limited to the range of 0.01 to 3.0%.
  • the W content is 0.5 to 2.0%. More preferably, the W content is
  • Nb 0.02 to 0.5%
  • Nb is an important element that fixes C and N as carbonitrides, reduces solid solution C and solid solution N affecting the Ms point, and suppresses a decrease in the Ms point, thereby contributing to high strength.
  • it is necessary to contain 0.02% or more of Nb.
  • the Nb content is limited to the range of 0.02 to 0.5%.
  • the Nb content is 0.02 to 0.3%. More preferably, the Nb content is 0.10 to 0.20%.
  • Al 0.001 to 0.1%
  • Al is an element that acts as a deoxidizer. In order to obtain such an effect, it is necessary to contain 0.001% or more of Al. On the other hand, if the Al content exceeds 0.1%, the amount of oxide increases, the cleanliness decreases, and the toughness decreases. Therefore, the Al content is limited to the range of 0.001 to 0.1%. Preferably, the Al content is 0.01 to 0.07%.
  • N 0.012-0.07%
  • N is an element that affects the Ms point, and is desirably reduced from the viewpoint of suppressing a decrease in the Ms point.
  • reducing the N content by less than 0.012% raises the refining costs.
  • N is contained exceeding 0.07%, nitride is formed and toughness is lowered.
  • the N content is limited to 0.012 to 0.07%.
  • the N content is 0.02 to 0.06%.
  • O 0.01% or less Since O exists as an oxide in steel, it adversely affects various properties. For this reason, in the present invention, it is desirable to reduce the O content as much as possible. In particular, when O exceeds 0.01%, hot workability, corrosion resistance, and toughness deteriorate. For this reason, the O content is limited to 0.01% or less. Preferably, the O content is 0.006% or less.
  • Nb, C, N, and Mn are within the above-described range, and the following formula (1) Nb-6C-2N-0.04Mn ⁇ ⁇ 0.145 (1) (Where Nb, C, N and Mn: content of each element (mass%)) The content is adjusted so as to satisfy.
  • the balance other than the above components is Fe and inevitable impurities.
  • the element selected as necessary is selected from V: 0.5% or less, Ti: 0.3% or less, Zr: 0.2% or less, B: 0.0001 to 0.0050%.
  • Species or two or more, and / or Ca: 0.0050% or less, REM: One or two selected from 0.01% or less, and / or Ta: 0.01 to 0.1%, Co: 0.01 to 1.0% And / or Sn: 0.20% or less and Mg: 0.0002 to 0.01% may be included.
  • V 0.5% or less, Ti: 0.3% or less, Zr: 0.2% or less
  • B One or more selected from 0.0001 to 0.0050% V, Ti, Zr and B all increase strength It is an element to be selected, and can be selected as necessary and contained in one or more kinds.
  • V, Ti, Zr and B have an effect of improving the resistance to sulfide stress cracking in addition to the above-described effects.
  • V: 0.01% or more, Ti: 0.005% or more, Zr: 0.01% or more, B: 0.0001% or more are preferable, but V: 0.5%, Ti: 0.3 %, Zr: 0.2%, and B: 0.0050%, if included, the toughness is lowered. For this reason, when it is contained, it is preferable to limit to V: 0.5% or less, Ti: 0.3% or less, Zr: 0.2% or less, and B: 0.0001 to 0.0050%.
  • Ca and REM are elements that contribute to the improvement of resistance to sulfide stress corrosion cracking through the control of sulfide morphology It can contain 1 type or 2 types as needed. In order to acquire such an effect, it is desirable to contain Ca: 0.0001% or more and REM: 0.001% or more. On the other hand, even if Ca: 0.0050% and REM: 0.01% are contained in excess, the effect is saturated and an effect commensurate with the content cannot be expected. For this reason, when it contains, it is preferable to limit to Ca: 0.0050% or less and REM: 0.01% or less, respectively.
  • Ta and Co are elements that improve strength. Select one or two as required. Can be contained. In order to obtain such an effect, it is preferable to contain Ta: 0.01% or more and Co: 0.01% or more. On the other hand, even if the content exceeds Ta: 0.1% and Co: 1.0%, the effect is saturated and an effect commensurate with the content cannot be expected. For this reason, when it is contained, it is preferably limited to the ranges of Ta: 0.01 to 0.1% and Co: 0.01 to 1.0%, respectively.
  • Sn 0.20% or less
  • Mg One or two selected from 0.0002 to 0.01% Sn and Mg are both elements that improve corrosion resistance. Select one or two as required. Can be contained. In order to obtain such effects, it is desirable to contain Sn: 0.01% or more and Mg: 0.0002% or more. On the other hand, if the content exceeds Sn: 0.20% and Mg: 0.01%, the effect is saturated and an effect commensurate with the content cannot be expected. Therefore, when it is contained, it is preferable to limit to Sn: 0.20% or less and Mg: 0.0002 to 0.01%, respectively.
  • the seamless steel pipe of the present invention has the above-described composition, and a tempered martensite phase having a volume ratio of 50% or more as a main phase, a ferrite phase having a volume ratio of 20 to 40%, and a volume ratio of 10% or less. Of the remaining austenite phase.
  • the tempered martensite phase is the main phase and the volume ratio is 50% or more.
  • at least 20% or more of the ferrite phase is precipitated as the second phase by volume ratio.
  • a residual austenite phase is precipitated as a second phase in addition to the ferrite phase by 10% or less by volume. Due to the presence of the retained austenite phase, ductility and toughness are improved. In order to obtain such an effect, it is desirable to deposit 1% or more. On the other hand, a large amount of residual austenite phase exceeding 10% cannot secure the desired strength. For this reason, the residual austenite phase was limited to 10% or less by volume ratio.
  • the residual austenite phase is preferably 4 to 8% by volume.
  • the measurement of the structure having a tempered martensite phase of 50% or more, a ferrite phase of 20 to 40%, and a residual austenite phase of 10% or less in volume ratio First, a specimen for tissue observation was collected from the specimen material so that the cross section in the tube axis direction became the observation surface, and the specimen for tissue observation was collected with 2 g, 10 ml, and 100 ml of Villera reagent (picric acid, hydrochloric acid, and ethanol, respectively). The structure is corroded with a ratio) and the structure is imaged with a scanning electron microscope (1000 times), and the structure fraction (volume%) of the ferrite phase is calculated using an image analyzer.
  • test piece for X-ray diffraction is extract
  • the volume ratio of the tempered martensite phase can be calculated as the remainder other than these phases.
  • this structure of the present invention can be controlled by setting a specific component composition, performing a tempering process at a specific temperature, performing a quenching process at a specific temperature, and the like.
  • a stainless steel seamless steel pipe having the above composition is used as a starting material.
  • the production method of the starting material is not particularly limited, and any known production method of seamless steel pipes can be applied. A preferred method for producing this starting material will be described below.
  • the molten steel having the composition described above can be melted by a conventional melting method such as a converter and used as a steel pipe material such as a billet by a normal casting method such as a continuous casting method. Subsequently, these steel pipe materials are heated and subjected to a Mannesmann-plug mill type or Mannesmann-Mandrel mill type hot pipe forming process to produce seamless steel pipes having the desired dimensions with the above-described composition, which can be used as starting materials. . In addition, there is no problem even if it is a seamless steel pipe by hot extrusion by a press method.
  • the structure of the steel pipe can be a structure having the martensite phase as the main phase (50% or more by volume ratio).
  • the quenching treatment is preferably a treatment in which the starting material is heated to a heating temperature of 850 ° C. or higher and then cooled to a cooling stop temperature of 50 ° C. or lower at a cooling rate of air cooling or higher. If the heating temperature is too low (less than 850 ° C.), the desired strength may not be ensured. This is because the reverse transformation from martensite to austenite does not occur during heating, and the transformation from austenite to martensite does not occur during cooling. On the other hand, when the heating temperature is higher than 1150 ° C., the crystal grains may be coarsened. For this reason, it is preferable to limit the heating temperature of the quenching process to 850 to 1150 ° C. More preferably, the temperature is 900 to 1050 ° C.
  • the tempering treatment is preferably a treatment in which a seamless steel pipe subjected to the quenching treatment is heated to a tempering temperature of 500 to 650 ° C. and allowed to cool or air cool. If the tempering temperature is less than 500 ° C., the desired tempering effect may not be expected because the temperature is too low. On the other hand, at a high temperature exceeding 650 ° C., an as-quenched martensite phase is generated, and it may not be possible to satisfy all of the desired strength, toughness, and excellent corrosion resistance.
  • the tempering temperature is more preferably 550 to 600 ° C.
  • the heating temperature and tempering temperature of said hardening process point out the temperature of the steel pipe outer surface.
  • the structure of the seamless steel pipe becomes a structure having a tempered martensite phase, a ferrite phase and a retained austenite phase having a specific volume ratio. .
  • it becomes a stainless steel seamless steel pipe for oil wells having high strength, high toughness and excellent corrosion resistance.
  • Molten steel with the composition shown in Table 1 is melted in a converter, cast into a billet (steel pipe material) by a continuous casting method, piped using a model seamless rolling mill, and seamless steel pipe (outer diameter 83.8mm ⁇ x wall thickness) 15.0 mm). In addition, it air-cooled after pipe making.
  • specimen material soft steel pipe
  • structure observation tensile test, impact test, and corrosion resistance test.
  • Tissue observation A tissue observation test piece was collected from the obtained test piece material so that the cross section in the tube axis direction was an observation surface.
  • the obtained specimen for tissue observation was corroded with Virella reagent (2g, 10ml and 100ml mixed with picric acid, hydrochloric acid and ethanol, respectively), and the tissue was imaged with a scanning electron microscope (1000x), and image analysis was performed.
  • Virella reagent 2g, 10ml and 100ml mixed with picric acid, hydrochloric acid and ethanol, respectively
  • 1000x scanning electron microscope
  • Tensile test API strip specimen specified by API standard 5CT is collected from the obtained specimen material so that the tube axis direction is the tensile direction, and is tensioned according to the API regulations. Tests were conducted to determine tensile properties (yield strength YS, tensile strength TS).
  • Impact test V-notch test piece (5mm thick) is collected from the obtained specimen material so that the longitudinal direction of the specimen is perpendicular to the tube axis direction in accordance with JIS Z 2242.
  • the Charpy impact test was conducted.
  • the test temperature was ⁇ 10 ° C.
  • the impact value vE ⁇ 10 (J / cm 2 ) at ⁇ 10 ° C. was determined, and the toughness was evaluated.
  • Three test pieces were used, and the arithmetic average of the obtained values was taken as the impact value (J / cm 2 ) of the steel pipe.
  • Corrosion resistance test A corrosion test piece having a thickness of 3 mm, a width of 30 mm and a length of 40 mm was produced from the obtained test piece material by machining, and a carbon dioxide gas corrosion test was performed.
  • the carbon dioxide corrosion test is performed by immersing the test piece in a test solution retained in an autoclave: 20 mass% NaCl aqueous solution (liquid temperature: 200 ° C., 30 atmospheres CO 2 gas atmosphere), and the immersion period is 14 days ( 336 hours). About the test piece after a test, the weight was measured and the corrosion rate calculated from the weight loss before and behind a corrosion test was calculated
  • a round bar-like test piece (diameter: 6.4mm ⁇ ) is manufactured by machining from the obtained test piece material, and a sulfide stress cracking resistance test (SSC resistance test) is performed. did.
  • the anti-SCC test was performed by adding acetic acid + Na acetate to a test solution held in an autoclave: 20% by mass NaCl aqueous solution (liquid temperature: 100 ° C, H 2 S: 0.1 atm, CO 2 : 30 atm).
  • the test piece was immersed in an aqueous solution adjusted to pH: 3.3, the immersion period was set to 720 hours, and 100% of the yield stress was applied as the applied stress.
  • the presence or absence of a crack was observed. The case where there is no crack is a pass.
  • the SSC resistance test is performed by adding acetic acid + Na acetate to a test solution held in an autoclave: 20% by mass NaCl aqueous solution (liquid temperature: 25 ° C, H 2 S: 0.1 atm, CO 2 : 0.9 atm). : The test piece was immersed in an aqueous solution adjusted to 3.5, the immersion period was 720 hours, and 90% of the yield stress was applied as the load stress. The test piece after the test was observed for cracks. The case where there is no crack is a pass.
  • Both Examples present invention yield strength: and more high strength 862MPa, impact value vE -10 at -10 ° C.: and 50 J / cm 2 or more high toughness, CO 2, Cl - high as 200 ° C. containing the Excellent corrosion resistance (carbon dioxide corrosion resistance) in corrosive environments, and no cracking (SSC, SCC) in an environment containing H 2 S.
  • At least one of Cu, W, Nb, the above-described formula (1), and the volume ratio of retained austenite is out of the scope of the present invention.
  • At least one of sulfide stress cracking resistance (SSC resistance) and sulfide stress corrosion cracking resistance (SCC resistance) was inferior.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

L'invention porte sur un tuyau sans soudure en acier inoxydable à haute résistance pour des puits de pétrole, qui a une excellente résistance à la corrosion. Ce tuyau sans soudure en acier inoxydable à haute résistance pour des puits de pétrole est conçu pour avoir une composition qui contient 0,012 à 0,05 % de C, 1,0 % ou moins de Si, 0,1 à 0,5 % de Mn, 0,05 % ou moins de P, moins de 0,005 % de S, plus de 16,0 % mais 18,0 % ou moins de Cr, plus de 2,0 % mais 4,0 % ou moins de Mo, 3,0 % ou plus mais moins de 5,0 % de Ni, 0,5 à 2,0 % de Cu, 0,01 à 3,0 % de W, 0,02 à 0,5 % de Nb, 0,001 à 0,1 % d'Al, 0,012 à 0,07 % de N et 0,01 % ou moins de O, les teneurs en Nb, C, N et Mn satisfaisant à la relation Nb-6C-2N-0,04Mn ≥ -0,145 (Nb, C, N et Mn représentant les teneurs (% en masse) des éléments respectifs), et le reste étant constitué de Fe et d'impuretés inévitables. Ce tuyau sans soudure en acier inoxydable à haute résistance pour des puits de pétrole est également conçu pour avoir une structure qui est composée, en fractions volumiques, de 50 % ou plus d'une phase de martensite revenue, de 20 à 40 % d'une phase de ferrite et de 10 % ou moins d'une phase d'austénite résiduelle.
PCT/JP2015/005175 2014-11-19 2015-10-13 Tuyau sans soudure en acier inoxydable à haute résistance pour des puits de pétrole Ceased WO2016079920A1 (fr)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018131340A1 (fr) * 2017-01-13 2018-07-19 Ｊｆｅスチール株式会社 Tuyau en acier inoxydable sans soudure à résistance élevée et son procédé de fabrication
JP2018524472A (ja) * 2015-06-29 2018-08-30 ヴァルレック オイル アンド ガス フランス 耐食鋼、耐食鋼の製造方法、及び使用
CN109563581A (zh) * 2016-07-27 2019-04-02 杰富意钢铁株式会社 油井用高强度不锈钢无缝钢管及其制造方法
WO2021065263A1 (fr) * 2019-10-01 2021-04-08 Ｊｆｅスチール株式会社 Tuyau d'acier inoxydable sans soudure et procede de fabrication de celui-ci
WO2021065262A1 (fr) * 2019-10-01 2021-04-08 Ｊｆｅスチール株式会社 Tuyau d'acier inoxydable sans soudure et procede de fabrication de celui-ci
US11306369B2 (en) 2017-02-24 2022-04-19 Jfe Steel Corporation High-strength stainless steel seamless pipe for oil country tubular goods, and method for producing same
CN115552049A (zh) * 2020-06-02 2022-12-30 杰富意钢铁株式会社 双相不锈钢和双相不锈钢无缝钢管
US20230340632A1 (en) * 2020-07-06 2023-10-26 Jfe Steel Corporation Stainless steel seamless pipe and method for manufacturing same
EP4123040A4 (fr) * 2020-03-19 2024-10-02 JFE Steel Corporation Tuyau en acier inoxydable sans soudure et procédé de production d'un tuyau en acier inoxydable sans soudure
JPWO2024209843A1 (fr) * 2023-04-06 2024-10-10

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008081793A (ja) * 2006-09-28 2008-04-10 Jfe Steel Kk 高靭性でかつ耐食性に優れた油井用高強度ステンレス鋼管
JP2013234344A (ja) * 2012-05-07 2013-11-21 Kobe Steel Ltd 二相ステンレス鋼材および二相ステンレス鋼管
JP2013249516A (ja) * 2012-05-31 2013-12-12 Jfe Steel Corp 油井管用高強度ステンレス鋼継目無管およびその製造方法
JP2014043595A (ja) * 2012-08-24 2014-03-13 Nkktubes Kk 高強度高靭性高耐食マルテンサイト系ステンレス鋼

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5109222B2 (ja) * 2003-08-19 2012-12-26 Ｊｆｅスチール株式会社 耐食性に優れた油井用高強度ステンレス継目無鋼管およびその製造方法
WO2013146046A1 (fr) * 2012-03-26 2013-10-03 新日鐵住金株式会社 Acier inoxydable pour puits de pétrole et tuyau en acier inoxydable pour puits de pétrole

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008081793A (ja) * 2006-09-28 2008-04-10 Jfe Steel Kk 高靭性でかつ耐食性に優れた油井用高強度ステンレス鋼管
JP2013234344A (ja) * 2012-05-07 2013-11-21 Kobe Steel Ltd 二相ステンレス鋼材および二相ステンレス鋼管
JP2013249516A (ja) * 2012-05-31 2013-12-12 Jfe Steel Corp 油井管用高強度ステンレス鋼継目無管およびその製造方法
JP2014043595A (ja) * 2012-08-24 2014-03-13 Nkktubes Kk 高強度高靭性高耐食マルテンサイト系ステンレス鋼

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JP2018524472A (ja) * 2015-06-29 2018-08-30 ヴァルレック オイル アンド ガス フランス 耐食鋼、耐食鋼の製造方法、及び使用
CN109563581A (zh) * 2016-07-27 2019-04-02 杰富意钢铁株式会社 油井用高强度不锈钢无缝钢管及其制造方法
EP3456852A4 (fr) * 2016-07-27 2019-06-19 JFE Steel Corporation Tube en acier inoxydable sans soudure de haute résistance destiné aux puits de pétrole et son procédé de production
US11072835B2 (en) 2016-07-27 2021-07-27 Jfe Steel Corporation High-strength seamless stainless steel pipe for oil country tubular goods, and method for producing the same
WO2018131340A1 (fr) * 2017-01-13 2018-07-19 Ｊｆｅスチール株式会社 Tuyau en acier inoxydable sans soudure à résistance élevée et son procédé de fabrication
JP6384636B1 (ja) * 2017-01-13 2018-09-05 Ｊｆｅスチール株式会社 高強度ステンレス継目無鋼管およびその製造方法
EP3569724A4 (fr) * 2017-01-13 2019-12-25 JFE Steel Corporation Tuyau en acier inoxydable sans soudure à résistance élevée et son procédé de fabrication
US11268161B2 (en) 2017-01-13 2022-03-08 Jfe Steel Corporation High strength seamless stainless steel pipe and method for producing same
US11306369B2 (en) 2017-02-24 2022-04-19 Jfe Steel Corporation High-strength stainless steel seamless pipe for oil country tubular goods, and method for producing same
JPWO2021065263A1 (ja) * 2019-10-01 2021-11-04 Ｊｆｅスチール株式会社 ステンレス継目無鋼管およびその製造方法
US12291766B2 (en) 2019-10-01 2025-05-06 Jfe Steel Corporation Stainless steel seamless pipe and method for manufacturing same
WO2021065262A1 (fr) * 2019-10-01 2021-04-08 Ｊｆｅスチール株式会社 Tuyau d'acier inoxydable sans soudure et procede de fabrication de celui-ci
WO2021065263A1 (fr) * 2019-10-01 2021-04-08 Ｊｆｅスチール株式会社 Tuyau d'acier inoxydable sans soudure et procede de fabrication de celui-ci
JP7111253B2 (ja) 2019-10-01 2022-08-02 Ｊｆｅスチール株式会社 ステンレス継目無鋼管およびその製造方法
JP6915761B1 (ja) * 2019-10-01 2021-08-04 Ｊｆｅスチール株式会社 ステンレス継目無鋼管およびその製造方法
US12497676B2 (en) 2019-10-01 2025-12-16 Jfe Steel Corporation Stainless steel seamless pipe and method for manufacturing same
EP4123040A4 (fr) * 2020-03-19 2024-10-02 JFE Steel Corporation Tuyau en acier inoxydable sans soudure et procédé de production d'un tuyau en acier inoxydable sans soudure
CN115552049A (zh) * 2020-06-02 2022-12-30 杰富意钢铁株式会社 双相不锈钢和双相不锈钢无缝钢管
CN115552049B (zh) * 2020-06-02 2023-10-20 杰富意钢铁株式会社 双相不锈钢和双相不锈钢无缝钢管
US12509752B2 (en) 2020-06-02 2025-12-30 Jfe Steel Corporation Dual-phase stainless steel and dual-phase stainless steel seamless pipe
US20230340632A1 (en) * 2020-07-06 2023-10-26 Jfe Steel Corporation Stainless steel seamless pipe and method for manufacturing same
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JPWO2024209843A1 (fr) * 2023-04-06 2024-10-10

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