EP0277065B1 - Amagnetischer Mangan-Chrom-Stahl und daraus hergestelltes röhrenförmiges Element eines Bohrturms - Google Patents

Amagnetischer Mangan-Chrom-Stahl und daraus hergestelltes röhrenförmiges Element eines Bohrturms Download PDF

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Publication number
EP0277065B1
EP0277065B1 EP88400112A EP88400112A EP0277065B1 EP 0277065 B1 EP0277065 B1 EP 0277065B1 EP 88400112 A EP88400112 A EP 88400112A EP 88400112 A EP88400112 A EP 88400112A EP 0277065 B1 EP0277065 B1 EP 0277065B1
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EP
European Patent Office
Prior art keywords
steel
chromium
manganese
corrosion
magnetic
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.)
Expired - Lifetime
Application number
EP88400112A
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English (en)
French (fr)
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EP0277065A3 (en
EP0277065A2 (de
Inventor
Jean-Paul Houvion
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S M F International
Original Assignee
S M F International
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.)
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9347222&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0277065(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by S M F International filed Critical S M F International
Priority to AT88400112T priority Critical patent/ATE54952T1/de
Publication of EP0277065A2 publication Critical patent/EP0277065A2/de
Publication of EP0277065A3 publication Critical patent/EP0277065A3/fr
Application granted granted Critical
Publication of EP0277065B1 publication Critical patent/EP0277065B1/de
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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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

Definitions

  • Tubular elements of a drill string are known, such as drill collars, stabilizers or other measuring or control equipment which are made of non-magnetic steel. These elements must also resist stress corrosion in drilling muds which contain high proportions of chloride.
  • the corrosion tests were carried out in a solution whose composition approximates that of the most corrosive drilling mud encountered and used in drilling.
  • the tensile strength in the corrosive environment can be considered as a completely representative parameter of the corrosion resistance.
  • the test consists in subjecting a test piece to a rotary bending in the chloride solution mentioned above.
  • the rotation speed is 120 revolutions per minute.
  • a load equal to 75% of the elastic limit of the material is applied and, in a second series of tests, a load equal to 50% of this elastic limit. The number of cycles at break is noted each time.
  • drilling muds are generally at pH values between 10 and 12.
  • the conditions for forging the tubular parts as defined above correspond to a forging temperature of 680 to 650 ° C.
  • the forging operation is therefore adjusted as a function of the steel's ambient air cooling curve, to avoid forging in the critical precipitation zone.

Claims (7)

1. Amagnetischer Mangan-Chrom-Stahl, der gegen Korrosion unter Belastung einer chlorhaltigen Umgebung beständig ist, dadurch gekennzeichnet, daß er (in Gew.-%) höchstens 0,06% Kohlenstoff, 19 bis 26% Mangan, 7 bis 13% Chrom, etwa 0,3% Stickstoff, 0,6% Silicium und Restgehalte an Nickel und Molybdän von jeweils weniger als 0,2 und 0,1% enthält, wobei der Rest mit Ausnahme von unvermeidlichen Verunreinigungen aus Eisen besteht.
2. Amagnetischer Stahl gemäß Anspruch 1, dadurch gekennzeichnet, daß er (in Gew.-%) etwa 19,2% Mangan und 12% Chrom enthält.
3. Amagnetischer Stahl gemäß Anspruch 1, dadurch gekennzeichnet, daß er (in Gew.-%) etwa 25% Mangan und 8% Chrom enthält.
4. Amagnetischer Stahl gemäß irgendeinem der Ansprüche 2 und 3, dadurch gekennzeichnet, daß er wenigstens 0,005% Schwefel und 0,035% Phosphor enthält.
5. Amagnetischer Stahl gemäß Anspruch 1, dadurch gekennzeichnet, daß seine Gehalte an Kohlenstoff C, Stickstoff N, Silicium Si, Mangan Mn und Chrom Cr denen des folgenden Verhältnisses entsprechen:
497-462 (C + N) - 9,2 Si - 8,1 Mn -13,7 Cr < 15.
6. Röhrenförmiges Element eines Bohrturms, dadurch gekennzeichnet, daß es hergestellt wird aus einem Stahl, enthaltend (in Gew.-%) höchstens 0,06% Kohlenstoff, 19 bis 26% Mangan, 7 bis 13% Chrom, etwa 0,3% Stickstoff, 0,6% Silicium und Restgehalte an Nickel und Molybdän von jeweils weniger als 0,2% und 0,1%, wobei der Rest mit Ausnahme von unvermeidlichen Verunreinigungen aus Eisen besteht.
7. Röhrenförmiges Element gemäß Anspruch 6 mit einer großen Länge in der Größenordnung von 10 m, dadurch gekennzeichnet, daß es durch Schmieden einer Stange erhalten wird, das in einer ersten Stufe aus Schmieden des zentralen Teils der Stange bei einer Temperatur, die oberhalb des Bereichs der Ausscheidung innerhalb des Stahls liegt, und in einer zweiten Stufe aus Schmieden der Enden der Stange bei einer Temperatur, die unterhalb des Bereichs der Ausscheidung innerhalb des Stahls liegt, besteht.
EP88400112A 1987-01-23 1988-01-19 Amagnetischer Mangan-Chrom-Stahl und daraus hergestelltes röhrenförmiges Element eines Bohrturms Expired - Lifetime EP0277065B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88400112T ATE54952T1 (de) 1987-01-23 1988-01-19 Amagnetischer mangan-chrom-stahl und daraus hergestelltes roehrenfoermiges element eines bohrturms.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8700810 1987-01-23
FR8700810A FR2610008A1 (fr) 1987-01-23 1987-01-23 Acier amagnetique au manganese et au chrome et element tubulaire d'une colonne de forage realise en cet acier

Publications (3)

Publication Number Publication Date
EP0277065A2 EP0277065A2 (de) 1988-08-03
EP0277065A3 EP0277065A3 (en) 1988-08-10
EP0277065B1 true EP0277065B1 (de) 1990-07-25

Family

ID=9347222

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400112A Expired - Lifetime EP0277065B1 (de) 1987-01-23 1988-01-19 Amagnetischer Mangan-Chrom-Stahl und daraus hergestelltes röhrenförmiges Element eines Bohrturms

Country Status (5)

Country Link
EP (1) EP0277065B1 (de)
AT (1) ATE54952T1 (de)
DE (1) DE3860343D1 (de)
ES (1) ES2017790B3 (de)
FR (1) FR2610008A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2001155C1 (ru) * 1992-01-29 1993-10-15 Научно-производственное предпри тие "Салма" Лита аустенитна сталь
AT397968B (de) * 1992-07-07 1994-08-25 Boehler Ybbstalwerke Korrosionsbeständige legierung zur verwendung als werkstoff für in berührungskontakt mit lebewesen stehende teile
FR3008636B1 (fr) 2013-07-18 2015-08-07 Air Liquide Welding France Flux et procede de soudage a l'arc submerge des aciers a forte teneur en chrome

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE728159C (de) * 1936-10-09 1942-11-21 Boehler & Co Ag Geb Chrom-Mangan-Stickstoff-Stahl
AT214466B (de) * 1959-06-04 1961-04-10 Schoeller Bleckmann Stahlwerke Stahllegierungen zur Herstellung von Schwerstangen für Tiefbohrgestänge
AT233038B (de) * 1961-10-18 1964-04-25 Schoeller Bleckmann Stahlwerke Austenitische, korrosionsbeständige Chrom-Mangan-Stickstoff-Stähle zur Herstellung von gegen Spannungsrißkorrosion beständigen Gegenständen
US4450008A (en) * 1982-12-14 1984-05-22 Earle M. Jorgensen Co. Stainless steel

Also Published As

Publication number Publication date
ES2017790B3 (es) 1991-03-01
ATE54952T1 (de) 1990-08-15
FR2610008B1 (de) 1993-02-26
EP0277065A3 (en) 1988-08-10
EP0277065A2 (de) 1988-08-03
FR2610008A1 (fr) 1988-07-29
DE3860343D1 (de) 1990-08-30

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