EP1624082A1 - Acier austénitique non-magnétisable et utilisations de cet acier. - Google Patents

Acier austénitique non-magnétisable et utilisations de cet acier. Download PDF

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Publication number
EP1624082A1
EP1624082A1 EP04012322A EP04012322A EP1624082A1 EP 1624082 A1 EP1624082 A1 EP 1624082A1 EP 04012322 A EP04012322 A EP 04012322A EP 04012322 A EP04012322 A EP 04012322A EP 1624082 A1 EP1624082 A1 EP 1624082A1
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EP
European Patent Office
Prior art keywords
steel
content
weight
steels
corrosion resistance
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.)
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Application number
EP04012322A
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German (de)
English (en)
Inventor
Peter Dipl.-Ing. Grüneberg
Armin Dr.-Ing. Krabiell
Ekkehard Dr.-Ing. Wulfmeier
Hendrik Dr.Ing. John
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.)
Edelstahl Witten-Krefeld GmbH
Original Assignee
Edelstahl Witten-Krefeld GmbH
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 Edelstahl Witten-Krefeld GmbH filed Critical Edelstahl Witten-Krefeld GmbH
Priority to EP04012322A priority Critical patent/EP1624082A1/fr
Priority to PCT/EP2005/005423 priority patent/WO2005116285A1/fr
Publication of EP1624082A1 publication Critical patent/EP1624082A1/fr
Withdrawn legal-status Critical Current

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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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • 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
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the invention relates to a non-magnetizable, austenitic steel of high corrosion resistance and strength.
  • the property of being non-magnetic is obtained by the steel having a stable austenitic lattice structure in which no martensitic transformation occurs and which is free of ferrite portions.
  • steels of this type are suitable for applications in which the interaction between the components made of the respective steel and ambient magnetic fields or hysteresis-related losses must be avoided. Examples of such areas of application can be found in refrigeration technology, in shipbuilding or special shipbuilding, in generator construction, in the offshore sector, in deep drilling technology, medical technology or the electrical industry.
  • the steels must be particularly resistant to corrosion as they are widely used in environments critical to corrosion attack.
  • the steels are highly resistant to pitting, contact and stress corrosion cracking.
  • the high N contents also contribute to an increase in corrosion resistance.
  • This is additionally supported by chromium contents, which are usually 14-20% by weight in the known steels. Further improvements in corrosion resistance can be achieved by adding Mo.
  • EP 0 640 695 A1 An example of such a steel intended specifically for applications on the human body is described in EP 0 640 695 A1.
  • the steel known from this publication has (in% by weight) max. 0.1% C, max. 1.0% Si, 11.0-25.0% Mn, 10.0-20.0% Cr, max. 1.0% Mo and 0.05 - 0.55% N, balance iron and unavoidable impurities.
  • the known steel may have contents of V, Nb, Ta, W, Al, Ti, Cu or boron if the content of these elements does not exceed 2.0% by weight. The influences that these elements on the however, are not explained in EP 0 640 695 A1.
  • the steel known from this document can also contain additional contents of Ni, Si, S, Bi, Cu, Co, V, Nb, Ta, Ti, Zr, Hf, W, Al, B, Ce or Ca having a content of up to 2 wt .-%.
  • the strength of these steels produced and assembled in a known manner is at a level that is not sufficient for use in the fields of interest mentioned herein.
  • a nonmagnetizable, austenitic steel of high corrosion resistance and strength which (in% by weight) C: 0.010-0.050%, Si: 0.01-0.35%, Mn: 12.0-22 , 0%, P: ⁇ 0.030%, S: ⁇ 0.010%, Cr: 15.0 - 23.5%, Mo: 1.0 - 4.0%, Ni: 0, 3 - 5.5%, Al : ⁇ 0.050%, N: 0, 40 - 0.68%, B: 0.0008 - 0.0040%, at least one of the elements Cu and / or Co, the following being applicable to the content of these elements: Cu: 1.0 - 5.0%, Co: 1.0-6.5%, and optionally Nb with a content of 0.001-0.1%, balance iron and unavoidable impurities.
  • a steel is available, which is characterized by a particularly high stability of its austenitic structure and a correspondingly minimized magnetizability. Due to these properties, relative permeability values ⁇ r of ⁇ 1.005 are reliably achieved. At the same time, steel according to the invention has a significantly improved corrosion resistance compared with the known non-magnetic steels while the strength is still good. This makes steel according to the invention particularly suitable for use in an aggressive environment, as is the case, for example, in the field of offshore technology, or in deep drilling technology, in particular in the field of oil and natural gas exploration. Also, steel according to the invention can be used particularly well in generator construction, in refrigeration technology or in medical technology because of this property combination.
  • Characteristic features of the composition of the invention are the special alloy tuning, in which the effect of certain alloying elements has been used in particular for increasing the corrosion resistance.
  • the alloying measures compared to the known steels relate in particular to the modification of the contents of molybdenum and nickel and the individual or combined addition of copper and cobalt depending on the particular case of use.
  • the passivity range is thereby widened compared to copper-free steels.
  • a reduction of the material removal rates is achieved.
  • the anticorrosive effect is shown to a particularly high degree against attack by non-oxidizing media, such as sulfur-containing substances, and HCL attack.
  • the strongest effect in terms of corrosion inhibition is achieved by the dissolved amounts of copper. If the distribution is sufficiently homogeneous and fine, precipitated copper also contributes to the reduction of mass removal.
  • copper helps to stabilize the austenitic structure, allowing the use of the corrosion-inhibiting influence of other elements, eg higher levels of molybdenum.
  • the upper limit of the Cu content is 5% by weight, preferably 4 wt .-%, in order to avoid the formation of copper phases, which lose their corrosion-inhibiting effect on coarse, inhomogeneous distribution on the one hand, and on the other greatly affect the forming behavior of the steels.
  • Additions of cobalt in contents of at least 1% by weight, on the other hand, can purposefully improve the resistance of the steel according to the invention to oxidizing media.
  • cobalt leads in a similar way as copper to a widening of the passivity range in the temperature concentration field of the contact media.
  • the presence of cobalt in steel according to the invention further supports austenite stabilization. Accordingly, by adding cobalt, the contents of such alloying elements can be increased, which are undesirable per se because of their ferrite-forming property, but contribute to the optimized corrosion resistance of the steel according to the invention.
  • a reduction of the Ni content in favor of the presence of cobalt achieved strong effects, so that the combined presence of Ni and Co showed better activity than the single presence of Ni without Co.
  • Co contents which are well above 6.5 wt .-%, no further increase in the effect could be found.
  • An optimal ratio of achieved property improvement and alloying expense resulted when the Co contents were varied to a maximum of 4 wt .-%.
  • the invention thus provides a possibility of producing a high-strength and non-magnetic steel with regard to its properties
  • the presence of molybdenum at levels of 1.0-4.0% by weight also contributes to the high corrosion resistance of a steel according to the invention.
  • the use of molybdenum was in the genus of the steel belonging to the known steels only very limited because of the strong ferrite-forming property of Mo.
  • the steel composition of the present invention allows increased addition of Mo due to the enhanced austenite stability due to the presence of Cu and / or Co, with the result that overall improved corrosion resistance is achieved. At levels less than 1.0% by weight, the beneficial effects of Mo do not occur. By contrast, contents of more than 4.0% by weight would again entail the risk of ferrite formation and would also impair the formability of the steel.
  • Nickel is added to austenite stabilizing steel of the invention at levels of 0.3-5.5 wt%.
  • the maximum Ni content is limited to 5.0 wt% in order to take advantage of the surprisingly found improvement in the corrosion resistance of the reduced Ni content in the co-presence of Cu and / or Co.
  • nitrogen contents of 0.40 - 0.68 wt .-% By nitrogen contents of 0.40 - 0.68 wt .-%, the formation of a stable austenitic structure is supported. In addition, nitrogen contributes in a conventional manner to improve the corrosion properties. These effects are particularly certain when the N content is 0.45-0.68% by weight, in particular 0.45-0.60% by weight.
  • the blocks were subjected to hot deformation by forging in the temperature range between 1230 ° C and 970 ° C.
  • the hot deformation can also be carried out as rolling if the end product is to be delivered as a rolled product.
  • thermoformed intermediates were cooled to below the recrystallization temperature.
  • a cooling rate was achieved which was at least that obtained by cooling in air Cooling rate corresponds. It proved particularly advantageous to carry out the cooling to a temperature which is between 250 ° C and the recrystallization temperature.
  • the intermediates cooled to this temperature were then subjected to a final transformation.
  • the resulting degree of deformation was in the range of 10 - 35%, in which case it was found that particularly good results were achieved when the degree of deformation in the range of 15 - 20%.
  • the forged and cooled blocks were reduced from the steels in the final deformation with a degree of deformation of 18% each to a final diameter of 136 mm.
  • the current density potential curves (current density j above the potential ⁇ ) for the samples tested in 1000 ppm Cl - containing medium are v 1000 , E 1000 and applied the samples V 80000 and E 80000 investigated in 80,000 ppm Cl - containing medium.

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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)
EP04012322A 2004-05-25 2004-05-25 Acier austénitique non-magnétisable et utilisations de cet acier. Withdrawn EP1624082A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04012322A EP1624082A1 (fr) 2004-05-25 2004-05-25 Acier austénitique non-magnétisable et utilisations de cet acier.
PCT/EP2005/005423 WO2005116285A1 (fr) 2004-05-25 2005-05-19 Acier austenitique non magnetisable et utilisations de cet acier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04012322A EP1624082A1 (fr) 2004-05-25 2004-05-25 Acier austénitique non-magnétisable et utilisations de cet acier.

Publications (1)

Publication Number Publication Date
EP1624082A1 true EP1624082A1 (fr) 2006-02-08

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Family Applications (1)

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EP04012322A Withdrawn EP1624082A1 (fr) 2004-05-25 2004-05-25 Acier austénitique non-magnétisable et utilisations de cet acier.

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EP (1) EP1624082A1 (fr)
WO (1) WO2005116285A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2248919B1 (fr) 2009-04-27 2015-10-21 Daido Tokushuko Kabushiki Kaisha Acier inoxydable non magnétique à haute résistance à la corrosion
RU2813453C1 (ru) * 2023-12-08 2024-02-12 Общество с ограниченной ответственностью "ЗЛАТОУСТОВСКИЙ МЕТАЛЛУРГИЧЕСКИЙ ЗАВОД" Аустенитная высокопрочная коррозионно-стойкая немагнитная азотсодержащая сталь ЗИ135

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8535606B2 (en) * 2008-07-11 2013-09-17 Baker Hughes Incorporated Pitting corrosion resistant non-magnetic stainless steel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904401A (en) * 1974-03-21 1975-09-09 Carpenter Technology Corp Corrosion resistant austenitic stainless steel
US5094812A (en) * 1990-04-12 1992-03-10 Carpenter Technology Corporation Austenitic, non-magnetic, stainless steel alloy
CH688862A5 (de) * 1995-01-03 1998-04-30 Basf Ag Korrosionsbestaendige Legierung zur Verwendung als Werkstoff fuer am oder im menschlichen Koerper verwendete Gegenstaende, insbesondere zur Vermeidung von Nickel-Allergie.
EP0987342A1 (fr) * 1998-09-16 2000-03-22 Daido Tokushuko Kabushiki Kaisha Acier inoxydable non magnétique à haute résistance, et procédé pour sa production
WO2000026428A1 (fr) * 1998-11-02 2000-05-11 Crs Holdings, Inc. Acier inoxydable austenitique cr-mn-ni-cu

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904401A (en) * 1974-03-21 1975-09-09 Carpenter Technology Corp Corrosion resistant austenitic stainless steel
US5094812A (en) * 1990-04-12 1992-03-10 Carpenter Technology Corporation Austenitic, non-magnetic, stainless steel alloy
CH688862A5 (de) * 1995-01-03 1998-04-30 Basf Ag Korrosionsbestaendige Legierung zur Verwendung als Werkstoff fuer am oder im menschlichen Koerper verwendete Gegenstaende, insbesondere zur Vermeidung von Nickel-Allergie.
EP0987342A1 (fr) * 1998-09-16 2000-03-22 Daido Tokushuko Kabushiki Kaisha Acier inoxydable non magnétique à haute résistance, et procédé pour sa production
WO2000026428A1 (fr) * 1998-11-02 2000-05-11 Crs Holdings, Inc. Acier inoxydable austenitique cr-mn-ni-cu

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2248919B1 (fr) 2009-04-27 2015-10-21 Daido Tokushuko Kabushiki Kaisha Acier inoxydable non magnétique à haute résistance à la corrosion
RU2813453C1 (ru) * 2023-12-08 2024-02-12 Общество с ограниченной ответственностью "ЗЛАТОУСТОВСКИЙ МЕТАЛЛУРГИЧЕСКИЙ ЗАВОД" Аустенитная высокопрочная коррозионно-стойкая немагнитная азотсодержащая сталь ЗИ135

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