US20060231168A1 - Seamless steel tubes and pipes for use in oil well - Google Patents

Seamless steel tubes and pipes for use in oil well Download PDF

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Publication number
US20060231168A1
US20060231168A1 US11/387,747 US38774706A US2006231168A1 US 20060231168 A1 US20060231168 A1 US 20060231168A1 US 38774706 A US38774706 A US 38774706A US 2006231168 A1 US2006231168 A1 US 2006231168A1
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Prior art keywords
steel
content
less
mechanical strength
oil well
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Abandoned
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US11/387,747
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English (en)
Inventor
Keiichi Nakamura
Hajime Osako
Nobutoshi Murao
Toshiharu Abe
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Nippon Steel Corp
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Assigned to SUMITOMO METAL INDUSTRIES, LTD. reassignment SUMITOMO METAL INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MURAO, NOBUTOSHI, NAKAMURA, KEIICHI, OSAKO, HAJIME, ABE, TOSHIHARU
Publication of US20060231168A1 publication Critical patent/US20060231168A1/en
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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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten

Definitions

  • the present invention relates to seamless steel tubes and pipes (hereinafter, simply referred to as tube(s)) for use in oil well, more particularly, to tubes having less variation of tensile strength, i.e., excellent stability in mechanical strength.
  • Seamless steel tubes having higher reliability compared to welded tubes are frequently used in hostile oil well environment and/or high temperature environment, so that the tubes having higher mechanical strength in association with stable strength, higher toughness and higher resistance to sour gas environment degradation are required.
  • seamless steel tubes containing V, Nb, Ti, Cr and Mo that are arranged to satisfy the relationship expressed by the preset equation to thereby suppress the formation of M 23 C 6 type carbide, which are in general formed in quenching and tempering treatment, are disclosed as having high toughness as well as high corrosion resistance.
  • the present invention is started in view of the above circumstances, and the task thereof is to provide seamless steel tubes for use in oil well having excellent stability in mechanical strength, which can be produced by efficient means leading up to realization of energy saving.
  • the present inventors to achieve the above task, looked into the problems thus far and made various investigations on the production of seamless steel tubes having excellent stability in mechanical strength to thereby obtain findings shown in (a)-(d) in the followings, and, thus, the present invention is completed.
  • N is immobilized as nitride to thereby leave B in the dissolved state, so that the quench hardenability can be enhanced.
  • V fine carbide precipitates during tempering treatment to thereby enhance the mechanical strength.
  • Nb contributes to enhance the resistance to sulfide stress corrosion cracking by forming carbonitride, and so does B by enhancing the quench hardenability which leading up to increasing martensite.
  • the shape of non-metallic inclusions can be improved to enhance the resistance to sulfide stress corrosion cracking.
  • the present invention is completed based on the above findings and the gist thereof pertains to seamless steel tubes for use in oil well shown in the following (1)-(4).
  • Seamless steel tubes for use in oil well comprising, by mass %, C: 0.14-0.35%, Si: 0.05-1.0%, Mn: 0.05-2.0%, Cr: 0.05-1.5%, Mo: 0.05-2.0%, Ti: 0-0.05%, V: 0-0.1%, and Al: not less than 0.010%, wherein each content of Al, N, Ti and V satisfies the relationship expressed by the equation (i) below, and wherein the residuals are Fe and impurities including P: not more than 0.025% and S: not more than 0.010%, 0.00001 ⁇ Al ⁇ N ⁇ 14 ⁇ (Ti/144+V/153) ⁇ 0.00050 (i),
  • excellent stability in mechanical strength is meant to that there is less variation of strength like tensile strength of steel, which will be recited at the later stage.
  • mass % may be designated by simply %, hereinafter.
  • FIG. 1 is a diagram showing the effect of Al and the effective N on the variation of yield strength of steel tubes that were subjected to quenching and tempering treatment.
  • the present invention pertains to seamless steel tubes for use in oil well, comprising C: 0.14-0.35%, Si: 0.05-1.0%, Mn: 0.05-2.0%, Cr: 0.05-1.5%, Mo: 0.05-2.0%, Ti: 0-0.05%, V: 0-0.1%, and Al: not less than 0.010%, wherein each content of Al, N, Ti and V satisfies the relationship expressed by foregoing equation (i), and wherein the residuals are Fe and impurities including P: not more than 0.025% and S: not more than 0.010%.
  • the reason for such limitation as above in the invention and a preferable range is recited further.
  • Carbon (C) is contained for the purpose of ensuring the mechanical strength of seamless steel tubes for use in oil well.
  • the quench hardenabiliy becomes deficient.
  • the temperature of tempering treatment can not be raised, so that it becomes difficult to ensure the required property of steel.
  • the proper range of C content is set to 0.14-0.35%.
  • the preferable range of C content is 0.16-0.28%, and more preferably 0.20-0.28%.
  • Silicon (Si) has not only a function of a deoxidizer but also a function of enhancing the quench hardenability of steel to heighten the mechanical strength.
  • Si In order to utilize the above function, it is necessary for Si of not less than 0.05% to be contained. However, when its content exceeds 1.0% and gets higher, the resistance to sulfide stress corrosion cracking deteriorates. Thus, the proper range of Si content is set to 0.05-1.0%. Further, the preferable range of Si content is 0.1-0.5%.
  • Manganese (Mn) has not only a function of a deoxidizer but also a function of enhancing the quench hardenability of steel to heighten the mechanical strength. In order to utilize the above function, it is necessary for Mn of not less than 0.05% to be contained. However, when the content exceeds 2.0% and gets higher, the compositional segregation aggravates to thereby decrease the toughness. Thus, the proper range of Mn content is set to 0.05-2.0%.
  • Phosphor (P) is an impurity in steel and tends to segregate along the grain boundaries to thereby reduce the toughness. Accordingly, the proper range of P content is set to not more than 0.025%. And a preferable P content is not more than 0.020%.
  • S Sulfur
  • Mn or Ca Sulfur
  • S content exceeds 0.010%, the deterioration of the toughness as well as the resistance to sulfide stress corrosion cracking in steel worsens, which is attributable to non-metallic inclusions.
  • the proper range of S content is set to not more than 0.010%.
  • a preferable S content is not more than 0.005%.
  • Chromium (Cr) is an effective element in enhancing the quench hardenability of steel, and needs to be contained by not less than 0.05% in order to achieve the above effect. However, when its content exceeds 1.5% and gets higher, the toughness as well as the resistance to sulfide stress corrosion cracking in steel decreases. Thus, the proper range of Cr content is set to 0.05-1.5%. And a preferable Cr content is 0.2-1.2%.
  • Molybdenum (Mo) is an effective element not only in enhancing the quench hardenability to thereby ensure the high mechanical strength but also in increasing the resistance to sulfide stress corrosion cracking.
  • Mo should be contained by not less than 0.05%.
  • the proper range of Mo content is set to 0.05-2.0%.
  • a preferable Mo content is 0.1-0.8%.
  • Aluminum (Al) has a function of a deoxidizer and is an effective element in enhancing the toughness as well as the workability of steel. And when Al content is less than 0.010%, the dissolved state C increases, resulting in the marked increase of mechanical strength. Thus, the proper range of Al content is set to not less than 0.010%. And a preferable upper limit of Al content is 0.080%.
  • a proper range of the concentration product is set to 0.00001-0.00050 as expressed by the above equation (i). And a preferable range of the concentration product is 0.00003-0.0003.
  • FIG. 1 is the diagram showing the effect of Al and the effective N on the variation of yield strength of steel tubes that were subjected to quenching and tempering treatment.
  • the valuation whether the variation of yield strength of steel tubes is large or small is made in accordance with the equation (ii) as described hereinbelow. Namely, the symbol ⁇ in the diagram designates that the variation of mechanical strength is small, while the symbol ⁇ designates that the variation of mechanical strength is large.
  • the proper range of the concentration product to be given by Al content (mass %) and the effective N content is the region where the above equation (@) is satisfied, and also Al content is not less than 0.010%.
  • a first group consists of Ti, V, Nb and B, wherein one or more of these elements is contained, when necessary.
  • Titanium (Ti) is an element having the function that it immobilizes N in steel as nitride to thereby leave B in steel as the dissolved state during quenching treatment, thus contributing to enhance the quench hardenability.
  • This element may not be contained, but the above function can be utilized by containing it.
  • the range of the content of Ti when it is contained is set to 0-0.05%. And a preferable range of the content is 0.005-0.025%.
  • Boron (B) is an element having the function that it contributes to enhance the quench hardenability to thereby increase the amount of martensite, thus enhancing the resistance to sulfide stress corrosion cracking. Even if its content should be the level of an impurity, its function can be exerted. It does not matter whether it may be contained or not, but it is preferable that its content is not less than 0.0003% in order to exhibit the more distinct effect. When B content exceeds 0.005% and gets higher, however, the steel toughness decreases. Thus, a content range when B is contained is set to 0.0003-0.005%. And a preferable content range is 0.0003-0.003%.
  • Vanadium (V) is an element having the function that it precipitates as carbide during tempering treatment to thereby heighten the mechanical strength of steel. This element may not be contained, but the above function can be utilized by containing it. On the other hand, when its content exceeds 0.3% and gets higher, the steel toughness decreases. From this reason, a content range when V is contained is set to 0-0.3%.
  • Niobium (Nb) is an element having the function that it forms carbonitride at an elevated temperature range to thereby prevent the grain size from coarsening, thus enhancing the steel toughness as well as the resistance to sulfide stress corrosion cracking.
  • This element may not be contained, but the above function can be utilized by containing it by not less than 0.005%.
  • a content range when Nb is contained is set to 0.005-0.040%.
  • a preferable content range is 0.010-0.030%.
  • a second group consists of Ca, Mg and REM.
  • the billet of 225 mm in diameter was made for each of 22 grades of test steel whose chemical compositions are shown in Tables 1 and 2. Then, the billet was heated at 1250° C., and subjected to Mannesmann Mandrel Tube Making Process to obtain a seamless steel tube of 244.5 mm in outside diameter with 13.8 mm in thickness. Thereafter, the seamless steel tube was subjected to quenching and tempering treatment and the tensile test specimen was sampled therefrom. TABLE 1 Inventive or Chemical Compositions (mass %, Residuals of Fe and Impurities) Test No. Steel No.
  • quenching was performed in such a way that, after holding 5 min at 950° C. for uniform heat distribution, water quenching was applied, and tempering was performed by holding the steel tube thus quenched at 650° C. for 30 min.
  • the above heat treatment condition is one example, and the quenching and tempering treatment to be applied for seamless steel tubes according to the present invention is not limited to the above.
  • the tensile test specimen with circular arc strip shape cross-section at its parallel portion is prepared from the longitudinal direction of the sampled tube coupon for tensile test purpose, and then, the tensile test was conducted to measure yield strength YS (MPa).
  • Average YS is defined to designate the average YS in tensile tests across all test steels (22 grades) to be used for testing
  • Each YS is defined to designate the individual average YS in tensile tests for the test steel (one grade) of interest
  • Standard Deviation of Each YS is defined to designate the standard deviation for the test steel of interest (one grade).
  • Test Nos. 1-12 are Inventive Examples which employed Steel Nos. 1-12 according the present invention, while Test Nos. 13-22 are Comparative Examples which employed Steel Nos. 13-22 that are comparative steels.
  • Test Nos. 1-12 that employed Steel Nos. 1-12 that conform to all conditions specified by the present invention, the variation of yield strength YS was small, and the stability in mechanical strength was excellent.
  • Test Nos. 6, 7, 8 and 10 that employed Steel Nos. 6, 7, 8 and 10 that contained Ti, V, Nb or B, much higher mechanical strength as well as the resistance to sulfide stress corrosion cracking were obtained, due to enhancement of quench hardenability, while in Test Nos. 6, 8, 9 and 10 that employed steels with one or more of Ca, Mg and REM, much higher resistance to sulfide stress corrosion cracking were obtained.
  • the present invention provides seamless steel tubes for oil well use having excellent stability in mechanical strength, which can be produced by efficient means leading up to realization of energy saving.
  • seamless steel tubes for oil well use according to the present invention is highly appreciated as ones having the stability in mechanical strength which can be produced under the circumstances where energy savings along with productivity is mostly concerned, and can be widely used from the viewpoint of both streamlining of production process and the expansion of application.

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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 Steel (AREA)
  • Heat Treatment Of Articles (AREA)
US11/387,747 2005-03-25 2006-03-24 Seamless steel tubes and pipes for use in oil well Abandoned US20060231168A1 (en)

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JP2005-087462 2005-03-25
JP2005087462A JP2006265668A (ja) 2005-03-25 2005-03-25 油井用継目無鋼管

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2133442A1 (en) * 2007-03-30 2009-12-16 Sumitomo Metal Industries, Ltd. Low-alloy steel, seamless steel pipe for oil well, and process for producing seamless steel pipe
US20110253265A1 (en) * 2010-04-15 2011-10-20 Nisshin Steel Co., Ltd. Quenched and tempered steel pipe with high fatigue life, and its manufacturing method
US20120186686A1 (en) * 2011-01-25 2012-07-26 Tenaris Coiled Tubes, Llc Coiled tube with varying mechanical properties for superior performance and methods to produce the same by a continuous heat treatment
US20130084205A1 (en) * 2010-06-08 2013-04-04 Nippon Steel & Summitoma Metalcorporation Steel for steel tube with excellent sulfide stress cracking resistance
US20130264123A1 (en) * 2012-04-10 2013-10-10 Tenaris Connections Limited Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same
CN104946975A (zh) * 2015-07-13 2015-09-30 攀钢集团成都钢钒有限公司 旋挖钻机钻杆用无缝钢管的原料钢及其冶炼方法
US9598746B2 (en) 2011-02-07 2017-03-21 Dalmine S.P.A. High strength steel pipes with excellent toughness at low temperature and sulfide stress corrosion cracking resistance
US9644248B2 (en) 2013-04-08 2017-05-09 Dalmine S.P.A. Heavy wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes
US9657365B2 (en) 2013-04-08 2017-05-23 Dalmine S.P.A. High strength medium wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes
US9803256B2 (en) 2013-03-14 2017-10-31 Tenaris Coiled Tubes, Llc High performance material for coiled tubing applications and the method of producing the same
US9970242B2 (en) 2013-01-11 2018-05-15 Tenaris Connections B.V. Galling resistant drill pipe tool joint and corresponding drill pipe
US10844669B2 (en) 2009-11-24 2020-11-24 Tenaris Connections B.V. Threaded joint sealed to internal and external pressures
US11105501B2 (en) 2013-06-25 2021-08-31 Tenaris Connections B.V. High-chromium heat-resistant steel
US11124852B2 (en) 2016-08-12 2021-09-21 Tenaris Coiled Tubes, Llc Method and system for manufacturing coiled tubing
US11833561B2 (en) 2017-01-17 2023-12-05 Forum Us, Inc. Method of manufacturing a coiled tubing string

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JP5020689B2 (ja) * 2007-04-17 2012-09-05 新日本製鐵株式会社 切削性に優れた機械構造用鋼管
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CN102392185B (zh) * 2011-10-28 2013-05-22 首钢总公司 一种正火态抗酸性热轧钢板及其制备方法
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CN103469081A (zh) * 2013-09-10 2013-12-25 内蒙古包钢钢联股份有限公司 一种含稀土bt90h钢级稠油热采井用套管及轧制方法
CN103498106A (zh) * 2013-09-10 2014-01-08 内蒙古包钢钢联股份有限公司 含硼加稀土bt110h钢级稠油热采井用套管及生产方法
CN103627962B (zh) * 2013-12-03 2015-11-18 内蒙古包钢钢联股份有限公司 稠油热采井用无缝钢管及其制备方法
CN103614631B (zh) * 2013-12-03 2015-09-30 内蒙古包钢钢联股份有限公司 含稀土射孔枪管体的制备方法
US10233520B2 (en) * 2014-06-09 2019-03-19 Nippon Steel & Sumitomo Metal Corporation Low-alloy steel pipe for an oil well
CN104532168B (zh) * 2015-01-09 2016-06-15 江西理工大学 高品质非调质钻探用无缝钢管及其制造方法
CN107338396A (zh) * 2017-06-28 2017-11-10 包头钢铁（集团）有限责任公司 高淬透性储气库用无缝钢管及其生产方法
CN109680209A (zh) * 2018-11-07 2019-04-26 林州凤宝管业有限公司 一种n80钢级非调质油管钢及其制备油管的方法

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US6866725B2 (en) * 2000-02-28 2005-03-15 Nippon Steel Corporation Steel pipe excellent in formability and method of producing the same

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JP3449311B2 (ja) * 1999-09-06 2003-09-22 住友金属工業株式会社 高靱性・高耐食性継目無鋼管

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US5938865A (en) * 1995-05-15 1999-08-17 Sumitomo Metal Industries, Ltc. Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance
US6866725B2 (en) * 2000-02-28 2005-03-15 Nippon Steel Corporation Steel pipe excellent in formability and method of producing the same

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2133442A1 (en) * 2007-03-30 2009-12-16 Sumitomo Metal Industries, Ltd. Low-alloy steel, seamless steel pipe for oil well, and process for producing seamless steel pipe
EP2133442A4 (en) * 2007-03-30 2010-04-28 Sumitomo Metal Ind LOW-ALLOY STEEL, SOLDER-FREE STEEL PIPE FOR OIL WELLS, AND METHOD FOR MANUFACTURING SOLDER-FREE STEEL PIPE
US10844669B2 (en) 2009-11-24 2020-11-24 Tenaris Connections B.V. Threaded joint sealed to internal and external pressures
US20110253265A1 (en) * 2010-04-15 2011-10-20 Nisshin Steel Co., Ltd. Quenched and tempered steel pipe with high fatigue life, and its manufacturing method
US9540704B2 (en) 2010-04-15 2017-01-10 Nisshin Steel Co., Ltd. Method of making quenched and tempered steel pipe with high fatigue life
US20130084205A1 (en) * 2010-06-08 2013-04-04 Nippon Steel & Summitoma Metalcorporation Steel for steel tube with excellent sulfide stress cracking resistance
US9175371B2 (en) * 2010-06-08 2015-11-03 Nippon Steel & Sumitomo Metal Corporation Steel for steel tube with excellent sulfide stress cracking resistance
US20120186686A1 (en) * 2011-01-25 2012-07-26 Tenaris Coiled Tubes, Llc Coiled tube with varying mechanical properties for superior performance and methods to produce the same by a continuous heat treatment
US11952648B2 (en) 2011-01-25 2024-04-09 Tenaris Coiled Tubes, Llc Method of forming and heat treating coiled tubing
US9163296B2 (en) * 2011-01-25 2015-10-20 Tenaris Coiled Tubes, Llc Coiled tube with varying mechanical properties for superior performance and methods to produce the same by a continuous heat treatment
US10480054B2 (en) 2011-01-25 2019-11-19 Tenaris Coiled Tubes, Llc Coiled tube with varying mechanical properties for superior performance and methods to produce the same by a continuous heat treatment
US9598746B2 (en) 2011-02-07 2017-03-21 Dalmine S.P.A. High strength steel pipes with excellent toughness at low temperature and sulfide stress corrosion cracking resistance
US20130264123A1 (en) * 2012-04-10 2013-10-10 Tenaris Connections Limited Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same
EP2650389A3 (en) * 2012-04-10 2018-03-07 Tenaris Connections B.V. Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same
US9340847B2 (en) * 2012-04-10 2016-05-17 Tenaris Connections Limited Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same
US9970242B2 (en) 2013-01-11 2018-05-15 Tenaris Connections B.V. Galling resistant drill pipe tool joint and corresponding drill pipe
US11377704B2 (en) 2013-03-14 2022-07-05 Tenaris Coiled Tubes, Llc High performance material for coiled tubing applications and the method of producing the same
US9803256B2 (en) 2013-03-14 2017-10-31 Tenaris Coiled Tubes, Llc High performance material for coiled tubing applications and the method of producing the same
US10378075B2 (en) 2013-03-14 2019-08-13 Tenaris Coiled Tubes, Llc High performance material for coiled tubing applications and the method of producing the same
US10378074B2 (en) 2013-03-14 2019-08-13 Tenaris Coiled Tubes, Llc High performance material for coiled tubing applications and the method of producing the same
US9644248B2 (en) 2013-04-08 2017-05-09 Dalmine S.P.A. Heavy wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes
US9657365B2 (en) 2013-04-08 2017-05-23 Dalmine S.P.A. High strength medium wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes
US11105501B2 (en) 2013-06-25 2021-08-31 Tenaris Connections B.V. High-chromium heat-resistant steel
CN104946975A (zh) * 2015-07-13 2015-09-30 攀钢集团成都钢钒有限公司 旋挖钻机钻杆用无缝钢管的原料钢及其冶炼方法
US11124852B2 (en) 2016-08-12 2021-09-21 Tenaris Coiled Tubes, Llc Method and system for manufacturing coiled tubing
US11833561B2 (en) 2017-01-17 2023-12-05 Forum Us, Inc. Method of manufacturing a coiled tubing string

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JP2006265668A (ja) 2006-10-05
CN100412222C (zh) 2008-08-20

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