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WO2010113843A1 - Procédé de fabrication d'une conduite en alliage de cr-ni sans soudure à résistance élevée - Google Patents

Procédé de fabrication d'une conduite en alliage de cr-ni sans soudure à résistance élevée Download PDF

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Publication number
WO2010113843A1
WO2010113843A1 PCT/JP2010/055520 JP2010055520W WO2010113843A1 WO 2010113843 A1 WO2010113843 A1 WO 2010113843A1 JP 2010055520 W JP2010055520 W JP 2010055520W WO 2010113843 A1 WO2010113843 A1 WO 2010113843A1
Authority
WO
WIPO (PCT)
Prior art keywords
less
alloy
rem
content
strength
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
PCT/JP2010/055520
Other languages
English (en)
Japanese (ja)
Inventor
陽平 乙▲め▼
正晃 五十嵐
浩一 岡田
邦夫 近藤
雅之 相良
一宗 下田
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
Sumitomo Metal Industries Ltd
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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to ES10758614T priority Critical patent/ES2714371T3/es
Priority to CN201080014375.3A priority patent/CN102369300B/zh
Priority to JP2010512446A priority patent/JP4553073B1/ja
Priority to EP10758614.1A priority patent/EP2415883B1/fr
Publication of WO2010113843A1 publication Critical patent/WO2010113843A1/fr
Priority to US13/245,110 priority patent/US20120031534A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/11—Making amorphous alloys

Definitions

  • the present invention relates to a method for producing a high-strength Cr—Ni alloy seamless pipe excellent in hot workability and stress corrosion cracking resistance.
  • Examples of materials exhibiting excellent corrosion resistance in corrosive environments include Cr—Ni alloys disclosed in Patent Document 1, Patent Document 2, and Patent Document 3. Further, it is disclosed here that it is effective to increase the N content in order to increase the strength of the Cr—Ni alloy. However, the alloy strengthened by this method has a problem that the deformation resistance is high and the hot workability is inferior.
  • an inclined piercing and rolling method (also referred to as Mannesmann pipe manufacturing method) as a method for producing a seamless pipe efficiently with high productivity.
  • the material billet is subjected to inclined piercing and rolling (hereinafter simply referred to as “piercing and rolling”) using a piercer (inclined piercing and rolling mill) to obtain a hollow shell (hereinafter simply referred to as “elementary tube”).
  • the raw tube is rolled by a rolling mill such as a plug mill or a mandrel mill and stretched, and finally shaped by a sizer or a stretch reducer.
  • a seamless pipe having high strength and inferior hot workability as described above is produced by the inclined piercing and rolling method, two-piece cracking due to grain boundary melting is likely to occur.
  • Grain boundary melting is a phenomenon that occurs when crystal grain boundaries melt due to processing heat generation. When this grain boundary melting occurs, the ductility of the material is drastically lowered, and therefore, two-piece cracking due to the grain boundary melting is likely to occur.
  • the inclined piercing and rolling method has a higher degree of processing than the hot extrusion pipe manufacturing method, and therefore generates a large amount of processing heat. Therefore, there is a problem that two-piece cracking due to grain boundary melting is likely to occur.
  • Patent Document 5 discloses a technique for preventing intergranular fusion cracking, which is a problem in austenitic stainless steel, by reducing the P and S contents in accordance with the dimensions of the material to be pierced and rolled. However, it is not a technique for a higher-strength Cr—Ni alloy tube that can be used in an environment where high corrosion resistance is required.
  • Patent Document 6 discloses mechanical properties and corrosion resistance under a sour gas environment in which cracking and covering are prevented by performing piercing and rolling using a raw tube having a P and S content defined in a specific range.
  • An excellent Fe—Ni alloy seamless pipe is disclosed.
  • sufficient studies have not been made to obtain a higher strength Cr—Ni alloy seamless tube that has not only excellent hot workability but also excellent stress corrosion cracking resistance.
  • the present inventors have melted high N content Cr—Ni alloys having various chemical compositions, and examined the pipe forming properties during piercing and rolling.
  • the content of REM can be determined from the viewpoint of the amount necessary for fixing P as a phosphide. That is, the ratio [P / REM] of the P content to the REM content is important.
  • Mo 0.01% or more and less than 4.0% Mo, like Cu, is effective in stabilizing the passive film formed on the alloy surface, and is effective in improving stress corrosion cracking resistance.
  • Mo content is set to 0.01% or more and less than 4.0%. Preferably, it is 0.1% to 3.5%.
  • the Cr—Ni alloy according to the present invention further contains one or more elements selected from at least one of the following first group to third group: You may let them.
  • the Cr—Ni alloy seamless pipe according to the present invention contains the above essential element or the above optional element, with the balance being Fe and impurities.
  • impurities are components that are mixed due to various factors in the manufacturing process, including raw materials such as ore or scrap, when the Cr—Ni alloy is industrially produced. It is acceptable as long as it does not adversely affect.
  • an electric furnace, an AOD furnace, a VOD furnace or the like can be used for melting the Cr—Ni alloy of the present invention.
  • the molten metal is cast into an ingot, it can be made into slabs, blooms and billets by subsequent forging.
  • slabs, blooms, and billets can be formed by a continuous casting method.
  • the yield strength of a seamless pipe made of a Cr-Ni alloy suitable for use in deep oil wells and gas wells is 900 MPa or more at 0.2% proof stress. More preferably, it is 964 MPa or more.
  • a cold-worked seamless pipe produced by the above-described inclined piercing and rolling method is subjected to solution treatment, and further cold-worked. Manufactured.
  • a cold-worked seamless tube that has been hot-worked by the inclined piercing rolling method is subjected to cold drawing such as cold drawing or pilger rolling after solution heat treatment. Apply cold working by rolling. Note that the cold working may be performed once or a plurality of times, or may be performed once or a plurality of times after performing a heat treatment as necessary.
  • Table 1 shows the chemical compositions (mass%) of the inventive examples (test Nos. 1 to 23) and the comparative examples (test Nos. A to J).
  • the alloy according to the example of the present invention was melted and formed using a vacuum induction melting furnace and cast into a 30 kg ingot. This ingot was hot forged and formed into a billet having an outer diameter of 100 mm. Billets heated at 1240 ° C. and 1260 ° C. were pierced and rolled with a small inclined piercing and rolling apparatus to form a pipe having an outer diameter of 116 mm and a wall thickness of 20 mm.
  • the position of the rear end of the seamless pipe after piercing-rolling was 50 mm in the longitudinal direction, and the presence or absence of occurrence of double cracks in the pipe was confirmed. It was judged that no cracks occurred ( ⁇ ) and if it occurred ( ⁇ ).
  • the seamless tube heated and punched and rolled at 1240 ° C. was then subjected to a solution treatment in which it was heated at 1050 ° C. for 1 hour and then cooled with water.
  • the blank pipe was subjected to cold drawing with a cross-section reduction rate of 30% to obtain a seamless pipe according to the present invention example and the comparative example.
  • the mechanical properties and corrosion resistance are not affected.
  • a simple pipe pierced and rolled by a small inclined piercing and rolling apparatus was directly subjected to cold working after solution treatment and used for evaluation.
  • a room temperature tensile test piece having a diameter of 6 mm and a length of 40 mm was cut out from the longitudinal direction of the seamless pipe after cold working, and a tensile test was performed in the room temperature atmosphere to measure 0.2% yield strength. Further, in order to evaluate the stress corrosion cracking resistance, a test piece having a diameter of 3.81 mm and a length of 25.4 mm was cut out from the longitudinal direction of the tube after the same cold working, and a low strain rate tensile test was performed.
  • Table 2 shows test results and N ⁇ P / REM values.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention porte sur un procédé de fabrication d'une conduite en alliage de Cr-Ni sans soudure à résistance élevée qui a une excellente aptitude au façonnage à chaud et une excellente résistance à la fissuration par corrosion sous contrainte, tout en ayant une résistance élevée par augmentation de la teneur en azote, et ne provoque pas de fissuration en deux morceaux lors d'un laminage-perçage, caractérisé par le fait que l'on soumet à un traitement thermique en solution une conduite de base sans soudure obtenue par façonnage à chaud par un processus de laminage-perçage incliné à l'aide d'une billette faite d'un alliage contenant, en % en masse, C (0,05 % ou moins), Si (1,0 % ou moins), Mn (moins de 3,0 %), P (0,005 % ou moins), S (0,005 % ou moins), Cu (0,01 à 4,0 %), Ni (25 % ou plus mais moins de 35 %), Cr (20 à 30 %), Mo (0,01 % ou plus mais moins de 4,0 %), N (0,10 à 0,30 %), Al (0,03 à 0,30 %), O (oxygène, 0,01 % ou moins), REM (éléments des terres rares, 0,01 à 0,20 %), le reste étant constitué par Fe et les impuretés, et satisfaisant l'exigence représentée par la formule (1), suivi par un façonnage à froid. N × P / REM = 0,10 Formule (1) Dans la formule (1), P, N et REM représentent les teneurs (% en masse) de respectivement P, N et REM. L'alliage Cr-Ni peut contenir un ou plusieurs éléments choisis parmi W, Ti, Nb, Zr, V, Ca et Mg.
PCT/JP2010/055520 2009-04-01 2010-03-29 Procédé de fabrication d'une conduite en alliage de cr-ni sans soudure à résistance élevée Ceased WO2010113843A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ES10758614T ES2714371T3 (es) 2009-04-01 2010-03-29 Método para producir una tubería de aleación de Cr-Ni sin costura de alta resistencia
CN201080014375.3A CN102369300B (zh) 2009-04-01 2010-03-29 高强度Cr-Ni合金无缝管的制造方法
JP2010512446A JP4553073B1 (ja) 2009-04-01 2010-03-29 高強度Ｃｒ−Ｎｉ合金継目無管の製造方法
EP10758614.1A EP2415883B1 (fr) 2009-04-01 2010-03-29 Procédé de fabrication d'une conduite en alliage de cr-ni sans soudure à résistance élevée
US13/245,110 US20120031534A1 (en) 2009-04-01 2011-09-26 METHOD FOR PRODUCING HIGH-STRENGTH Cr-Ni ALLOY SEAMLESS PIPE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009088737 2009-04-01
JP2009-088737 2009-04-01

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/245,110 Continuation US20120031534A1 (en) 2009-04-01 2011-09-26 METHOD FOR PRODUCING HIGH-STRENGTH Cr-Ni ALLOY SEAMLESS PIPE

Publications (1)

Publication Number Publication Date
WO2010113843A1 true WO2010113843A1 (fr) 2010-10-07

Family

ID=42828133

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2010/055520 Ceased WO2010113843A1 (fr) 2009-04-01 2010-03-29 Procédé de fabrication d'une conduite en alliage de cr-ni sans soudure à résistance élevée

Country Status (6)

Country Link
US (1) US20120031534A1 (fr)
EP (1) EP2415883B1 (fr)
JP (1) JP4553073B1 (fr)
CN (1) CN102369300B (fr)
ES (1) ES2714371T3 (fr)
WO (1) WO2010113843A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102650023A (zh) * 2011-02-23 2012-08-29 宝山钢铁股份有限公司 一种油套管用含铜铁镍铬合金
WO2018066579A1 (fr) * 2016-10-05 2018-04-12 新日鐵住金株式会社 ALLIAGE À BASE DE NiCrFe
WO2021070735A1 (fr) * 2019-10-10 2021-04-15 日本製鉄株式会社 Matériau d'alliage et tuyau sans soudure pour puits de pétrole
JP2021183721A (ja) * 2020-05-22 2021-12-02 日本製鉄株式会社 Ｎｉ基合金管および溶接継手
JP7158618B1 (ja) 2022-05-27 2022-10-21 日本冶金工業株式会社 耐酸化性に優れたオーステナイト系Ｆｅ－Ｎｉ－Ｃｒ合金およびその製造方法
WO2023132339A1 (fr) * 2022-01-06 2023-07-13 日本製鉄株式会社 MATÉRIAU D'ALLIAGE Fe-Cr-Ni

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EP2801468B1 (fr) * 2013-05-07 2018-02-28 Discma AG Appareil et procédé de fabrication des récipients
CN103789624A (zh) * 2014-01-16 2014-05-14 安徽省杨氏恒泰钢管扣件加工有限公司 一种高韧性钢管材料及其制备方法
CN104846291B (zh) * 2015-04-21 2017-11-28 宝山钢铁股份有限公司 一种高强度抗腐蚀不锈钢、不锈钢油套管及其制造方法
ES2879798T3 (es) * 2016-02-02 2021-11-23 Tubacex Sa Tubos de aleación a base de níquel y método para la fabricación de los mismos
CN109576477A (zh) * 2018-11-27 2019-04-05 山西太钢不锈钢股份有限公司 用于冷作硬化型铁镍基耐蚀合金油井管的热处理方法
CN111020380B (zh) * 2019-11-28 2021-05-14 国网辽宁省电力有限公司沈阳供电公司 架空导线用合金钢芯线及其制备方法
US11618930B2 (en) * 2019-12-26 2023-04-04 Seiko Watch Kabushiki Kaisha Personal ornament and method for producing personal ornament
CN114032434B (zh) * 2021-10-27 2023-09-26 江苏金合特种合金材料有限公司 高耐蚀n08120材料冶炼及大口径无缝管生产工艺
CN115740079A (zh) * 2022-09-27 2023-03-07 浙江中达新材料股份有限公司 一种石油炼化裂解炉无缝合金管的制备方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57203735A (en) 1981-06-10 1982-12-14 Sumitomo Metal Ind Ltd Alloy of high stress corrosion cracking resistance for high-strength oil well pipe
JPS57207149A (en) 1981-06-17 1982-12-18 Sumitomo Metal Ind Ltd Precipitation hardening type alloy for high strength oil well pipe with superior stress corrosion cracking resistance
JPS58210155A (ja) 1982-05-31 1983-12-07 Sumitomo Metal Ind Ltd 耐食性の優れた油井管用高強度合金
WO2004112977A1 (fr) 2003-06-23 2004-12-29 Sumitomo Metal Industries, Ltd. Demi-produit de tube pour la fabrication de tube en acier sans soudure et procede de fabrication associe
WO2006003953A1 (fr) 2004-06-30 2006-01-12 Sumitomo Metal Industries, Ltd. TUYAU BRUT EN ALLIAGE DE Fe-Ni ET SA MÉTHODE DE PRODUCTION
WO2008081866A1 (fr) 2006-12-28 2008-07-10 Sumitomo Metal Industries, Ltd. Procédé de production de tube en acier sans soudure fait en acier allié à teneur élevée en chrome et à teneur élevée en nickel
JP2009030153A (ja) * 2007-07-02 2009-02-12 Sumitomo Metal Ind Ltd 高合金管の製造方法
JP2009084668A (ja) * 2007-10-03 2009-04-23 Sumitomo Metal Ind Ltd 高強度Ｃｒ−Ｎｉ合金材およびそれを用いた油井用継目無管

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60114554A (ja) * 1983-11-24 1985-06-21 Kawasaki Steel Corp 継目無鋼管用高Νｉオ−ステナイト系ステンレス鋼
JP3650951B2 (ja) * 1998-04-24 2005-05-25 住友金属工業株式会社 耐応力腐食割れ性に優れた油井用継目無鋼管
SE525252C2 (sv) * 2001-11-22 2005-01-11 Sandvik Ab Superaustenitiskt rostfritt stål samt användning av detta stål
JP4140556B2 (ja) * 2004-06-14 2008-08-27 住友金属工業株式会社 耐硫化物応力割れ性に優れた低合金油井管用鋼
JP4792778B2 (ja) * 2005-03-29 2011-10-12 住友金属工業株式会社 ラインパイプ用厚肉継目無鋼管の製造方法
JP4502010B2 (ja) * 2005-08-22 2010-07-14 住友金属工業株式会社 ラインパイプ用継目無鋼管およびその製造方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57203735A (en) 1981-06-10 1982-12-14 Sumitomo Metal Ind Ltd Alloy of high stress corrosion cracking resistance for high-strength oil well pipe
JPS57207149A (en) 1981-06-17 1982-12-18 Sumitomo Metal Ind Ltd Precipitation hardening type alloy for high strength oil well pipe with superior stress corrosion cracking resistance
JPS58210155A (ja) 1982-05-31 1983-12-07 Sumitomo Metal Ind Ltd 耐食性の優れた油井管用高強度合金
WO2004112977A1 (fr) 2003-06-23 2004-12-29 Sumitomo Metal Industries, Ltd. Demi-produit de tube pour la fabrication de tube en acier sans soudure et procede de fabrication associe
WO2006003953A1 (fr) 2004-06-30 2006-01-12 Sumitomo Metal Industries, Ltd. TUYAU BRUT EN ALLIAGE DE Fe-Ni ET SA MÉTHODE DE PRODUCTION
WO2008081866A1 (fr) 2006-12-28 2008-07-10 Sumitomo Metal Industries, Ltd. Procédé de production de tube en acier sans soudure fait en acier allié à teneur élevée en chrome et à teneur élevée en nickel
JP2009030153A (ja) * 2007-07-02 2009-02-12 Sumitomo Metal Ind Ltd 高合金管の製造方法
JP2009084668A (ja) * 2007-10-03 2009-04-23 Sumitomo Metal Ind Ltd 高強度Ｃｒ−Ｎｉ合金材およびそれを用いた油井用継目無管

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2415883A4

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102650023A (zh) * 2011-02-23 2012-08-29 宝山钢铁股份有限公司 一种油套管用含铜铁镍铬合金
WO2018066579A1 (fr) * 2016-10-05 2018-04-12 新日鐵住金株式会社 ALLIAGE À BASE DE NiCrFe
JPWO2018066579A1 (ja) * 2016-10-05 2019-07-11 日本製鉄株式会社 ＮｉＣｒＦｅ合金
WO2021070735A1 (fr) * 2019-10-10 2021-04-15 日本製鉄株式会社 Matériau d'alliage et tuyau sans soudure pour puits de pétrole
JPWO2021070735A1 (fr) * 2019-10-10 2021-04-15
JP7307370B2 (ja) 2019-10-10 2023-07-12 日本製鉄株式会社 合金材および油井用継目無管
JP2021183721A (ja) * 2020-05-22 2021-12-02 日本製鉄株式会社 Ｎｉ基合金管および溶接継手
JP7644345B2 (ja) 2020-05-22 2025-03-12 日本製鉄株式会社 Ｎｉ基合金管および溶接継手
JPWO2023132339A1 (fr) * 2022-01-06 2023-07-13
WO2023132339A1 (fr) * 2022-01-06 2023-07-13 日本製鉄株式会社 MATÉRIAU D'ALLIAGE Fe-Cr-Ni
JP7397391B2 (ja) 2022-01-06 2023-12-13 日本製鉄株式会社 Ｆｅ－Ｃｒ－Ｎｉ合金材
WO2023228699A1 (fr) * 2022-05-27 2023-11-30 日本冶金工業株式会社 ALLIAGE DE Fe-Ni-Cr AUSTÉNITIQUE AYANT UNE EXCELLENTE RÉSISTANCE À L'OXYDATION ET SON PROCÉDÉ DE PRODUCTION
JP2023174197A (ja) * 2022-05-27 2023-12-07 日本冶金工業株式会社 耐酸化性に優れたオーステナイト系Ｆｅ－Ｎｉ－Ｃｒ合金およびその製造方法
JP7158618B1 (ja) 2022-05-27 2022-10-21 日本冶金工業株式会社 耐酸化性に優れたオーステナイト系Ｆｅ－Ｎｉ－Ｃｒ合金およびその製造方法

Also Published As

Publication number Publication date
CN102369300B (zh) 2013-07-24
EP2415883A4 (fr) 2017-06-07
US20120031534A1 (en) 2012-02-09
JPWO2010113843A1 (ja) 2012-10-11
EP2415883B1 (fr) 2018-12-26
ES2714371T3 (es) 2019-05-28
CN102369300A (zh) 2012-03-07
JP4553073B1 (ja) 2010-09-29
EP2415883A1 (fr) 2012-02-08

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