EP0658632A1 - Acier tres resistant a la corrosion et acier tres resistant a la corrosion et tres apte au fa onnage - Google Patents

Acier tres resistant a la corrosion et acier tres resistant a la corrosion et tres apte au fa onnage Download PDF

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Publication number
EP0658632A1
EP0658632A1 EP94919855A EP94919855A EP0658632A1 EP 0658632 A1 EP0658632 A1 EP 0658632A1 EP 94919855 A EP94919855 A EP 94919855A EP 94919855 A EP94919855 A EP 94919855A EP 0658632 A1 EP0658632 A1 EP 0658632A1
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EP
European Patent Office
Prior art keywords
steel
corrosion resistance
workability
less
content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP94919855A
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German (de)
English (en)
Other versions
EP0658632A4 (fr
Inventor
Kenji Nippon Steel Corporation Nagoya Works Kato
Akihiro Miyasaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP0658632A1 publication Critical patent/EP0658632A1/fr
Publication of EP0658632A4 publication Critical patent/EP0658632A4/fr
Ceased legal-status Critical Current

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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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

Definitions

  • the present invention relates to a steel having excellent corrosion resistance and a steel having excellent corrosion resistance and workability. More particularly, the present invention relates to a steel having excellent corrosion resistance in exhaust systems of, for example, internal combustion engines in automobiles and ships and a steel which is excellent in corrosion resistance as well as in workability required for working he steel into components.
  • a steel comprising a common steel plated with aluminum or zinc for the purpose of avoiding internal or external corrosion has hitherto been used in an exhaust system of internal combustion engines including those of automobiles from the viewpoint of preventing the steel from being internally or externally corroded.
  • a catalyst or the like has been provided for exhaust gas purification purposes in an exhaust system, rendering the corrosion resistance of the above plated steel product unsatisfactory.
  • Japanese Unexamined Patent Publication (Kokai) Nos. 63-143240, 63-143241, and 2-156048 and the like disclose steels containing 3 to 12% of Cr for improving the corrosion resistance of a steel substrate in an exhaust system.
  • a steel incorporating a certain amount of Cr which is a representative example of a steel used in the above exhaust system, is likely to unfavorably undergo local corrosion when exposed to an aggressive environment.
  • the present invention has been made to provide a steel which has high resistance to aggressive environments in exhaust systems of internal combustion engines and the like and is cost effective, or a steel which has high resistance to aggressive environments in exhaust systems of internal combustion engines and the like and, at the same time, excellent workability and cost effectiveness.
  • the present inventors have studied from various viewpoints steels having excellent corrosion resistance under aggressive environments including those of exhaust systems.
  • the present inventors studied aggressive environments in exhaust systems and, as a result, found that the corrosion of the exhaust system in the internal combustion engines occurs in an environment in which chlorides, sulfate ions, and the like contained in an exhaust gas are heated to 80 to 150°C. Further, they conducted various studies on means to improve the corrosion resistance of the steel under aggressive environments and, as a result, found that, in contrast to conventional stainless steel, when the Cr content is reduced to 2.5 to 9.9% and Al is added in an amount of more than 3.0 to 8.0%, the resultant steel has excellent corrosion resistance under aggressive environments including those in exhaust systems.
  • the present inventors made further studies. As a result, they found that, in the above steel, a reduction in the C and N contents and, at the same time, the addition of Nb, V, Ti, Zr, Ta, and Hf in amounts meeting a particular requirement result in improved corrosion resistance and improved workability. Further, they found that better corrosion resistance can be provided by adding to the above steel at least one member selected from Cu, Mo, Sb, Ni and W and at least one member selected from REM and Ca and, further, Si and Mn are proper as a deoxidizing and strengthening element.
  • the present invention has been made mainly on the above finding, and the subject matter of the first invention resides in a steel having excellent corrosion resistance, characterized by comprising by weight Si: not less than 0.01 to less than 1.2%, Mn: 0.1 to 1.5%, Cr: 2.5 to 9.9%, and Al: more than 3.0 to 8.0%, and, other elements with the following upper limits: C: not more than 0.02%, P: not more than 0.03%, S: not more than 0.01%, and N: not more than 0.02%, with the balance consisting of Fe and unavoidable impurities.
  • the subject matter of the second invention resides in a steel comprising the same ingredients as those constituting the steel of the first invention and as an additional ingredient at least one member selected from, by weight, Cu: 0.05 to 3.0%, Mo: 0.05 to 2.0%, Sb: 0.01 to 0.5%, Ni: 0.01 to 2.0%, and W: 0.05 to 3.0%.
  • the subject matter of the third invention resides in a steel comprising the same ingredients as those constituting the steel of the first or second invention and as an additional ingredient at least one member selected from, by weight, rare earth element: 0.001 to 0.1%, and Ca: 0.0005 to 0.03%.
  • the subject matter of the fourth invention resides in a steel having excellent corrosion resistance and workability, characterized by comprising by weight Si: not less than 0.01 to less than 1.2%, Mn: 0.1 to 1.5%, Cr: 2.5 to 9.9%, and Al: more than 3.0 to 8.0%, and, other elements with the following upper limits: C: not more than 0.02%, P: not more than 0.03%, S: not more than 0.01%, and N: not more than 0.02%, and 0.01 to 0.5% in total of at least one element selected from Nb, V, Ti, Zr, Ta, and Hf, provided that a requirement represented by the following formula is met: with the balance consisting of Fe and unavoidable impurities.
  • the subject matter of the fifth invention resides in a steel comprising the same ingredients as those constituting the steel of the fourth invention and as an additional ingredient at least one member selected from, by weight, Cu: 0.05 to 3.0%, Mo: 0.05 to 2.0%, Sb: 0.01 to 0.5%, Ni: 0.01 to 2.0%, and W: 0.05 to 3.0%.
  • the subject matter of the sixth invention resides in a steel comprising the same ingredients as those constituting the steel of the fourth or fifth invention and as an additional ingredient at least one member selected from, by weight, rare earth element: 0.001 to 0.1%, and Ca: 0.0005 to 0.03%.
  • the present invention provides a steel member having sufficiently high corrosion resistance to cope with use under a harsh corrosive environment recently found in the above automobile exhaust gas system and a steel member having excellent corrosion resistance and workability.
  • the reason for the limitation of chemical ingredients, which are technical features of the present invention, will now be described in detail.
  • Si when added to a steel having a Cr content of not less than 2.5%, effectively serves as a deoxidizer and a strengthening element.
  • the Si content when the Si content is less than 0.01%, the deoxidization effect is unsatisfactory.
  • tie effect when it is not less than 1.2%, tie effect is saturated and, at the same time, the workability is deteriorated. For this reason, the Si content is limited to not less than 0.01 to less than 1.2%.
  • Mn is necessary as a deoxidizer for steel and should be contained in an amount of not less than 0.1%.
  • the Mn content exceeds 2.0%, the effect is saturated and, at the same time, the presence of excessive Mn deteriorates the workability of the steel. For this reason, the upper limit of the Mn content is 1.5%.
  • Cr should be incorporated in an amount of not less than 2.5% for ensuring the corrosion resistance of the steel.
  • the incorporation of Cr in an amount exceeding 9.9% uselessly incurs an increase in cost and, at the same time, deteriorates the workability of the steel. For this reason, the upper content of Cr is 9.9%.
  • Al as with Cr, is an element important to the present invention from the viewpoint of ensuring the corrosion resistance.
  • the Al content is not more than 3.0%, the effect of preventing the pitting corrosion is unsatisfactory.
  • the amount of Al added exceeds 8.0%, the above effect is saturated and, at the same time, the workability of the steel is deteriorated. For this reason, the Al content is limited to more than 3.0 to not more than 8.0%.
  • C and N deteriorate the workability of the steel sheet. Further, C combines with Cr to form a carbide which deteriorates the corrosion resistance of the steel. Further, N deteriorates the toughness of the steel. For this reason, the lower the C and N contents, the better the results, and the upper limits of the C and N contents are both 0.02%.
  • Nb, V, Ti, Zr, Ta, Hf, Nb, V, Ti, Zr, Ta, and Hf serve to fix, as a carbide, C and N contained in a high Cr steel, thereby significantly improving the corrosion resistance and the workability.
  • They may be added alone or in combination. However, for the addition of these elements alone or in combination, no effect can be attained when the total amount of the elements added is less than 0.01%. When the total amount exceeds 0.5%, the cost is uselessly increased and, at the same time, a flaw or the like is likely to occur during rolling. For this reason, the upper limit of these element is 0.5%.
  • the total amount of the Nb, V, Ti, Zr, Ta, and Hf added should satisfy a requirement represented by the following formula:
  • the above elements are fundamental ingredients of the steel having excellent corrosion resistance or the steel having excellent corrosion resistance and workability contemplated in the present invention. Further, steels with the following elements being optionally added for the purpose of further improving the properties are also contemplated in the present invention.
  • Cu when added in an amount of not less than 0.05% to a steel having a Cr content of not less than 2.5% and an Al content exceeding 3.0%, has the effect of improving the resistance to general corrosion.
  • the Cu content exceeds 3.0% the contemplated effect is saturated and, at the same time, the hot workability of the steel is deteriorated. For this reason, the upper content of Cu is 3.0%.
  • Mo when added in an amount of not less than 0.05% to a steel having a Cr content of not less than 2.5% and an Al content exceeding 3.0%, has the effect of inhibiting the occurrence and growth of pitting.
  • Mo content exceeds 1.5%, the contemplated effect is saturated and, at the same time, the workability of the steel is deteriorated. For this reason, the upper content of Mo is 1.5%.
  • Sb when added in an amount of not less than 0.01% to a steel having a Cr content of not less than 2.5% and an Al content exceeding 3.0%, has the effect of improving the resistance to pitting corrosion and general corrosion.
  • the Sb content exceeds 0.5%, the hot workability of the steel is deteriorated. For this reason, the upper content of Sb is 0.5%.
  • Ni when added in an amount of not less than 0.01% to a steel having a Cr content of not less than 2.5% and an Al content exceeding 3.0%, has the effect of preventing the pitting corrosion.
  • the Ni content exceeds 2.0%, the contemplated effect is saturated and, at the same time, the hot workability of the steel is deteriorated. For this reason, the upper content of Ni is 2.0%.
  • W when added, in an amount of not less than 0.05%, in combination with other additive elements, to a steel having a Cr content of not less than 2.5% and an Al content exceeding 3.0%, has the effect of significantly inhibiting the occurrence and growth of pitting.
  • the W content exceeds 3.0% the contemplated effect is saturated and, at the same time, the workability of the steel is deteriorated. For this reason, the upper content of W is 3.0%.
  • Rare earth elements and Ca are elements having the effect of improving the hot workability and the pitting corrosion resistance. No satisfactory effect can be attained when the content is less than 0.001% for the rare earth element and less than 0.0005% for Ca. On the other hand, when the content exceeds 0.1% for the rare earth element and 0.03% for Ca, coarse nonmetallic inclusions are formed to unfavorably deteriorate the hot workability and the pitting corrosion resistance. For this reason, the upper limit of the content is 0.1% for the rare earth element and 0.03% for Ca.
  • the term "rare earth element” is intended to mean elements with atomic numbers 57 to 71 (lanthanoids), atomic numbers 89 to 103 (actinoids), and atomic number 39 (Y).
  • the steel of the present invention when used in an exhaust system of internal combustion engines, may be first produced in a steel sheet form, formed by means of a press or the like into a predetermined shape, and further worked and welded to provide a product.
  • the steel sheet may be first formed into a steel pipe, for example, a seam welded steel pipe, and then fabricated, welded, or subjected to other steps to provide a product. All the steels having a composition and a combination of elements, including the process, specified in the present invention, are contemplated in the present invention.
  • the steel of the present invention can be applied to, in addition to an exhaust system of internal combustion engines, various other corrosive environments, such as an environment wherein an aqueous solution containing chlorides, sulfate ions, or the like is exposed to high temperatures or an environment wherein heating and cooling are repeated.
  • Steels comprising ingredients specified in Tables 1 to 9 were prepared by the melt process and subjected to conventional steel sheet production steps, such as hot rolling and cold rolling, to provide 1 mm-thick steel sheets which were then annealed at 850°C. Test pieces having a width of 50 mm and a length of 70 mm were prepared from these steel sheets and applied to a corrosion test.
  • the corrosion test was carried out by immersing a test piece to half the height thereof in an aqueous solution (50 cm3) containing 100 ppm of a sulfate ion, 100 ppm of a chloride ion, and 500 ppm of a bicarbonate ion in the form of an ammonium salt, holding the whole testing container in an atmosphere of 130°C to completely evaporate and volatilize the testing solution, and repeating the above procedure 20 times.
  • This test is a simulation of corrosive conditions in an automobile exhaust system.
  • O represents that the maximum corrosion depth was not more than 0.10 mm
  • ⁇ represents that the maximum corrosion depth was not more than 0.15 mm
  • ⁇ represents that the maximum corrosion depth exceeded 0.15 mm.
  • the workability was evaluated based on whether or not cracking occurred in a cup reduction test with a reduction ratio of 1.8.
  • test results are also shown in Tables 5, 7, and 9.
  • ⁇ represents that the results of the cup reduction test were good, and ⁇ represents that cracking occurred in the cup reduction test.
  • steel Nos. 1 to 36 of the present invention listed in Tables 1 and 2 and steel Nos. 50 to 86 of the present invention listed in Tables 4, 5, 6, and 7 had good corrosion resistance even in an exhaust gas environment which was a very harsh corrosive environment. Further, steel Nos. 50 to 86 of the present invention listed in Tables 4, 5, 6, and 7 were excellent also in workability. By contrast, steel Nos. 37 to 49 as comparative steels listed in Table 3 had poor corrosion resistance, and steel Nos. 87 to 98 as comparative steels listed in Tables 8 and 9 were poor in corrosion resistance as well as in workability.
  • the present invention provides a steel having excellent corrosion resistance in an exhaust system of an internal combustion engine in automobiles and the like or a steel having excellent corrosion resistance and workability at low cost and, hence, can greatly contribute to the development of industries.

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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 Sheet Steel (AREA)
EP94919855A 1993-07-06 1994-07-06 Acier tres resistant a la corrosion et acier tres resistant a la corrosion et tres apte au fa onnage. Ceased EP0658632A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP167207/93 1993-07-06
JP16720693 1993-07-06
JP167206/93 1993-07-06
JP16720793 1993-07-06
PCT/JP1994/001096 WO1995002074A1 (fr) 1993-07-06 1994-07-06 Acier tres resistant a la corrosion et acier tres resistant a la corrosion et tres apte au façonnage

Publications (2)

Publication Number Publication Date
EP0658632A1 true EP0658632A1 (fr) 1995-06-21
EP0658632A4 EP0658632A4 (fr) 1995-11-29

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EP94919855A Ceased EP0658632A4 (fr) 1993-07-06 1994-07-06 Acier tres resistant a la corrosion et acier tres resistant a la corrosion et tres apte au fa onnage.

Country Status (5)

Country Link
EP (1) EP0658632A4 (fr)
KR (1) KR0157727B1 (fr)
AU (1) AU668315B2 (fr)
CA (1) CA2143434A1 (fr)
WO (1) WO1995002074A1 (fr)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19820806B4 (de) * 1998-05-09 2004-03-04 Max-Planck-Institut Für Eisenforschung GmbH Verwendungen eines Leichtbaustahls
WO2004097059A1 (fr) * 2003-04-25 2004-11-11 Tubos De Acero De Mexico, S.A. Tube en acier sans jointure susceptible d'etre utilise comme canaliseur et procede d'obtention
US8007603B2 (en) 2005-08-04 2011-08-30 Tenaris Connections Limited High-strength steel for seamless, weldable steel pipes
US8221562B2 (en) 2008-11-25 2012-07-17 Maverick Tube, Llc Compact strip or thin slab processing of boron/titanium steels
US8328960B2 (en) 2007-11-19 2012-12-11 Tenaris Connections Limited High strength bainitic steel for OCTG applications
US8328958B2 (en) 2007-07-06 2012-12-11 Tenaris Connections Limited Steels for sour service environments
US8414715B2 (en) 2011-02-18 2013-04-09 Siderca S.A.I.C. Method of making ultra high strength steel having good toughness
WO2013178629A1 (fr) * 2012-05-29 2013-12-05 Thyssenkrupp Steel Europe Ag Acier fe-al-cr résistant au fluage à chaud
US8636856B2 (en) 2011-02-18 2014-01-28 Siderca S.A.I.C. High strength steel having good toughness
US8821653B2 (en) 2011-02-07 2014-09-02 Dalmine S.P.A. Heavy wall steel pipes with excellent toughness at low temperature and sulfide stress corrosion cracking resistance
US8926771B2 (en) 2006-06-29 2015-01-06 Tenaris Connections Limited Seamless precision steel tubes with improved isotropic toughness at low temperature for hydraulic cylinders and process for obtaining the same
US9187811B2 (en) 2013-03-11 2015-11-17 Tenaris Connections Limited Low-carbon chromium steel having reduced vanadium and high corrosion resistance, and methods of manufacturing
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
US11952648B2 (en) 2011-01-25 2024-04-09 Tenaris Coiled Tubes, Llc Method of forming and heat treating coiled tubing

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5609818A (en) * 1992-12-11 1997-03-11 Nippon Steel Corporation Steel excellent in corrosion resistance and processability
JP2007163307A (ja) * 2005-12-14 2007-06-28 Denso Corp ガスセンサ
IT1403689B1 (it) 2011-02-07 2013-10-31 Dalmine Spa Tubi in acciaio ad alta resistenza con eccellente durezza a bassa temperatura e resistenza alla corrosione sotto tensioni da solfuri.
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
KR20200065990A (ko) * 2018-11-30 2020-06-09 주식회사 포스코 황산 및 황산/염산 복합 응축 환경에서 내식성을 갖는 강판 및 그 제조방법
KR102255111B1 (ko) * 2019-07-31 2021-05-24 주식회사 포스코 내식성이 우수한 배기계용 페라이트계 강판

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FR2105944A5 (fr) * 1970-08-26 1972-04-28 Uss Eng & Consult
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EP0443179A1 (fr) * 1989-12-25 1991-08-28 Kawasaki Steel Corporation Acier au chrome-aluminium, résistant à l'oxydation

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JPH03166337A (ja) * 1989-11-24 1991-07-18 Nippon Steel Corp 自動車排ガス触媒担体用ステンレス鋼箔

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FR2105944A5 (fr) * 1970-08-26 1972-04-28 Uss Eng & Consult
US3698964A (en) * 1970-11-04 1972-10-17 Olin Corp Oxidation-resistant articles of an iron base alloy containing chromium and aluminum and/or silicon
US4316743A (en) * 1973-10-29 1982-02-23 Tokyo Shibaura Electric Co., Ltd. High damping Fe-Cr-Al alloy
EP0443179A1 (fr) * 1989-12-25 1991-08-28 Kawasaki Steel Corporation Acier au chrome-aluminium, résistant à l'oxydation

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Title
See also references of WO9502074A1 *

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19820806B4 (de) * 1998-05-09 2004-03-04 Max-Planck-Institut Für Eisenforschung GmbH Verwendungen eines Leichtbaustahls
NO342666B1 (no) * 2003-04-25 2018-06-25 Dalmine Spa Heltrukket stålrør for bruk som et lederør og fremgangsmåte for produksjon derav
WO2004097059A1 (fr) * 2003-04-25 2004-11-11 Tubos De Acero De Mexico, S.A. Tube en acier sans jointure susceptible d'etre utilise comme canaliseur et procede d'obtention
EA008812B1 (ru) * 2003-04-25 2007-08-31 Тубос Де Асеро Де Мексико, С.А. Бесшовная стальная труба, предназначенная для использования в трубопроводе, и способ ее производства
US8002910B2 (en) 2003-04-25 2011-08-23 Tubos De Acero De Mexico S.A. Seamless steel tube which is intended to be used as a guide pipe and production method thereof
US8007603B2 (en) 2005-08-04 2011-08-30 Tenaris Connections Limited High-strength steel for seamless, weldable steel pipes
US8926771B2 (en) 2006-06-29 2015-01-06 Tenaris Connections Limited Seamless precision steel tubes with improved isotropic toughness at low temperature for hydraulic cylinders and process for obtaining the same
US8328958B2 (en) 2007-07-06 2012-12-11 Tenaris Connections Limited Steels for sour service environments
US8328960B2 (en) 2007-11-19 2012-12-11 Tenaris Connections Limited High strength bainitic steel for OCTG applications
US8221562B2 (en) 2008-11-25 2012-07-17 Maverick Tube, Llc Compact strip or thin slab processing of boron/titanium steels
US10844669B2 (en) 2009-11-24 2020-11-24 Tenaris Connections B.V. Threaded joint sealed to internal and external pressures
US11952648B2 (en) 2011-01-25 2024-04-09 Tenaris Coiled Tubes, Llc Method of forming and heat treating coiled tubing
US8821653B2 (en) 2011-02-07 2014-09-02 Dalmine S.P.A. Heavy wall steel pipes with excellent toughness at low temperature and sulfide stress corrosion cracking resistance
US9222156B2 (en) 2011-02-18 2015-12-29 Siderca S.A.I.C. High strength steel having good toughness
US8636856B2 (en) 2011-02-18 2014-01-28 Siderca S.A.I.C. High strength steel having good toughness
US8414715B2 (en) 2011-02-18 2013-04-09 Siderca S.A.I.C. Method of making ultra high strength steel having good toughness
WO2013178629A1 (fr) * 2012-05-29 2013-12-05 Thyssenkrupp Steel Europe Ag Acier fe-al-cr résistant au fluage à chaud
US9970242B2 (en) 2013-01-11 2018-05-15 Tenaris Connections B.V. Galling resistant drill pipe tool joint and corresponding drill pipe
US9187811B2 (en) 2013-03-11 2015-11-17 Tenaris Connections Limited Low-carbon chromium steel having reduced vanadium and high corrosion resistance, and methods of manufacturing
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
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
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
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
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
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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Publication number Publication date
KR0157727B1 (ko) 1998-11-16
AU7083994A (en) 1995-02-06
CA2143434A1 (fr) 1995-01-07
KR950703069A (ko) 1995-08-23
EP0658632A4 (fr) 1995-11-29
WO1995002074A1 (fr) 1995-01-19
AU668315B2 (en) 1996-04-26

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