WO2012167854A1 - Composant de générateur de vapeur ainsi que procédé pour la fabrication d'un composant de générateur de vapeur - Google Patents

Composant de générateur de vapeur ainsi que procédé pour la fabrication d'un composant de générateur de vapeur Download PDF

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Publication number
WO2012167854A1
WO2012167854A1 PCT/EP2012/001681 EP2012001681W WO2012167854A1 WO 2012167854 A1 WO2012167854 A1 WO 2012167854A1 EP 2012001681 W EP2012001681 W EP 2012001681W WO 2012167854 A1 WO2012167854 A1 WO 2012167854A1
Authority
WO
WIPO (PCT)
Prior art keywords
steam generator
generator component
subjected
chromium
workpiece
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/EP2012/001681
Other languages
German (de)
English (en)
Inventor
Peter Körner
Gereon LÜDENBACH
Ralf Mohrmann
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.)
RWE Power AG
Original Assignee
RWE Power AG
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 RWE Power AG filed Critical RWE Power AG
Publication of WO2012167854A1 publication Critical patent/WO2012167854A1/fr
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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising
    • 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
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/0447—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the heat treatment
    • C21D8/0457—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes

Definitions

  • the invention relates to a steam generator component or a power plant component made of an alloyed, chromium-containing material having an austenitic, ferrite or martensitic structure or nickel-based alloy which has been subjected to a surface treatment.
  • the invention further relates to a process for the preparation of a
  • Steam generator components made of an alloyed chromium-containing material with an austenitic, ferrite or martensitic structure or as nickel-based alloy.
  • steam generator components or power plant components of the aforementioned type are, for example, heated or unheated pipe components and components of steam and gas turbines, chemical plants, solar receivers, etc. into consideration. All steam generator components or assemblies or
  • Power plant components whose surfaces are exposed to the hot media of the water-steam cycle or the boiler side of the flue gases are subject to oxidation and / or corrosion.
  • For such applications come as materials with carbon alloyed steels or nickel-based alloys into consideration, which are particularly suitable for high temperature applications.
  • a steam generator component of the aforementioned type is described for example in DE 10 2006 062 348 A1, which addresses the problem of
  • Material with a ferrite or martensitic or austenitic Structure with a chromium content of ⁇ 18 wt .-% which is at least partially surface-treated by means of shot-peening / shot-blasting.
  • the surface treatment described in DE 10 2006 062 348 A1 is intended, in particular, to achieve that, for example, the inner surface of the respective pipe is deformed when the pipes are hot, whereby a diffusion of chromium from the matrix of the base material to the treated surface is favored.
  • a thin chromium-rich layer forms on the treated surface, which is intended to counteract the growth of epitaxial and topotactic layers.
  • Smoke-gas exposed surfaces of steam generator components have shown, however, that especially austenitic pipe materials can experience structural changes resulting from the thermal operating stress, which can lead to a significant change in the oxidation or high-temperature corrosion behavior, which in particular leads to a strong
  • the invention is therefore based on the object, a steam generator component of the type mentioned above and a method for its production
  • the problem is solved by a steam generator component or a
  • Power plant component of an alloyed, chromium-containing material with an austenitic, ferrite or martensitic structure or as
  • Nickel-based alloy which has been subjected to a surface treatment, wherein the steam generator component is characterized in that the carbon content of the material varies over its thickness.
  • the material is particularly resistant to corrosion, in particular, when the carbon content in the near-surface regions of the relevant workpiece or directly at its surface is reduced relative to the residual wall thickness of the workpiece.
  • a steam generator component or a power plant component made of an alloyed, chromium-containing material, in particular an alloyed, chromium-containing austenitic steel, in which the carbon content is reduced in the material volume close to the surface.
  • Such decarburization can be targeted by a
  • the invention is based on the consideration that the carbon of high-temperature applications with carbon-alloyed steels participates only to a small extent in the oxidation and corrosion reactions. Instead, the carbon diffuses into the base material during the metal
  • Components of the steel in particular chromium and iron are converted into the oxide phase. With increasing degree of corrosion results in a
  • Chrome alloying element precipitates chromium carbides of the type M23C6 in the carburized, near-surface material volume of the workpiece, whereby chromium is removed from the metal matrix.
  • the diffusible chromium content available for the formation of a protective chromium oxide layer (Cr 2 O 3 or a chromium-rich iron-chromium spinel (FeCr 2 O 4 ) decreases.
  • These regions then have a significantly lower resistance to corrosion and oxidation than the base material With increasing erosion of the material of the component, the carbon content in the metal increases
  • the carbon is reduced, a carbide precipitation at the beginning of the thermal aging prevented and immediately after commissioning of the steam generator component due to such improved chromium diffusion to the component surface against corrosion and oxidation well protective chromium oxide or chromium rich Iron-chromium spinel layer is formed. This will successfully prevent further corrosion.
  • the carbon content of the material has a gradient of at least one surface in the direction of the center of a material layer or in the direction of the basic volume of the material.
  • the carbon content of the near-surface regions of the material can be reduced by a corresponding surface treatment.
  • the surface of the material may be treated by carbon effusion annealing, for example.
  • the workpiece can, for example, an annealing in a
  • Solid bed, a gas atmosphere or in a liquid phase medium, for example a salt bath, have been subjected to the absence of oxygen.
  • a material for example, an austenitic steel having a chromium content of at least 9 wt .-%
  • the chromium content of the steel is between about 9 and 35%.
  • the material may be a nickel-based alloy. Suitable materials include, for example, TP 347 HFG, SUPER 304H, Esshete 1250 and IN617. In an advantageous variant of the steam generator component, this is designed as a medium-permeable tube or part of a medium-permeable tube wall, the carbon content of the inner and outer sides
  • the steam generator component according to the invention is also improved with regard to the steam-side oxidation properties.
  • the object underlying the invention is further achieved by a method for producing a steam generator component from a chromium-containing material having an austenitic, ferrite or martensitic microstructure or as a nickel-based alloy, in which the carbon content of the material in the near-surface regions of one used for the component
  • Workpiece is at least partially reduced.
  • the workpiece or the component is subjected to an annealing treatment in the absence of oxygen.
  • the annealing treatment can be carried out, for example, at temperatures between 600 and 1200 ° C.
  • the workpiece is subjected to an annealing treatment in a hydrogen atmosphere.
  • the hydrogen partly enters into a chemical bond with the carbon from the near-surface regions of the material.
  • the duration of the annealing treatment is preferably chosen between 5 and 24 hours.
  • the duration of treatment and temperature are preferably chosen so that the thickness of the carbon-depleted layer is at least on one side approximately between 0.1 and 0.5 mm.
  • Edge area or surface area of the material is the microanalytical examination of a ground sample with position transverse to the tube longitudinal axis in
  • X-ray spectroscopy Another option is the Vickers microhardness test, where samples can be stored in advance at temperatures ranging from 650 to 700 ° C.
  • an annealing treatment in a hydrogen / gas atmosphere an annealing treatment in a fixed bed or in a solid bed can be carried out.
  • silica or magnesium oxide may be considered for the solids bed.
  • the annealing can be carried out in a liquid phase medium, for example in a salt bath.
  • the invention relates primarily to steam generator components in the form of tubes or tubular media-flow elements of convective
  • the invention particularly relates to components made of austenitic steels having a chromium content of between 9 and 35%.
  • the oxidation or corrosion behavior is improved over oxidizing liquids and gases, in particular flue gases of high temperature. This is ensured, in particular, by providing a material which has a carbon gradient and whose surface is carbon-depleted, which in particular results in corrosion-induced carburization of the metal near the surface
  • Material volume is prevented or prevented such.

Landscapes

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

Abstract

L'invention concerne un composant de générateur de vapeur ou un composant de centrale électrique fait d'un matériau à teneur en chrome, allié, solide, ayant une structure austénitique, ferritique ou martensitique ou en tant qu'alliage à base de nickel, qui a été soumis à un traitement de surface, ledit composant de générateur, de vapeur étant caractérisé en ce que la fraction carbone du matériau varie selon son épaisseur. L'invention concerne en outre un procédé de fabrication d'un tel composant de générateur de vapeur.
PCT/EP2012/001681 2011-06-07 2012-04-19 Composant de générateur de vapeur ainsi que procédé pour la fabrication d'un composant de générateur de vapeur Ceased WO2012167854A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011106222.3 2011-06-07
DE102011106222A DE102011106222A1 (de) 2011-06-07 2011-06-07 Dampferzeugerbauteil sowie Verfahren zur Herstellung eines Dampferzeugerbauteil

Publications (1)

Publication Number Publication Date
WO2012167854A1 true WO2012167854A1 (fr) 2012-12-13

Family

ID=46201540

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/001681 Ceased WO2012167854A1 (fr) 2011-06-07 2012-04-19 Composant de générateur de vapeur ainsi que procédé pour la fabrication d'un composant de générateur de vapeur

Country Status (2)

Country Link
DE (1) DE102011106222A1 (fr)
WO (1) WO2012167854A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006062348A1 (de) 2006-12-22 2008-07-03 Hitachi Power Europe Gmbh Oberflächengestrahlte Dampferzeugerbauteile oder Kraftwerkskomponenten
EP2014378A1 (fr) * 2006-04-28 2009-01-14 Sumitomo Metal Industries, Ltd. Procede de production de tuyau en acier inoxydable
KR20090110298A (ko) * 2006-12-29 2009-10-21 아레바 엔피 원자로 연료 어셈블리 및 원자로에 있어서의 환경 조장 균열 현상에 대한 니켈기 합금의 민감도를 줄이기 위한 열처리 방법 및 그러한 합금으로 제조되고 그러한 열처리 방법에 의해 열처리된 부품

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2010871A1 (de) * 1970-03-07 1971-10-07 Kernforschung Gmbh Ges Fuer Gegen Kernbrennstoff und Reaktorkuhl mittel korrosionsbeständige Brennstoff hülle fur Kernreaktoren
EP0683241B1 (fr) * 1994-05-21 2000-08-16 Yong Soo Park Acier inoxydable duplex présentant une amélioration de la résistance à la corrosion
DE10011758C2 (de) * 2000-03-13 2003-10-16 C D Waelzholz Produktionsgmbh Verfahren zur Herstellung von dünnwandigen Bauteilen aus Stahl und danach hergestellte Bauteile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2014378A1 (fr) * 2006-04-28 2009-01-14 Sumitomo Metal Industries, Ltd. Procede de production de tuyau en acier inoxydable
DE102006062348A1 (de) 2006-12-22 2008-07-03 Hitachi Power Europe Gmbh Oberflächengestrahlte Dampferzeugerbauteile oder Kraftwerkskomponenten
KR20090110298A (ko) * 2006-12-29 2009-10-21 아레바 엔피 원자로 연료 어셈블리 및 원자로에 있어서의 환경 조장 균열 현상에 대한 니켈기 합금의 민감도를 줄이기 위한 열처리 방법 및 그러한 합금으로 제조되고 그러한 열처리 방법에 의해 열처리된 부품

Also Published As

Publication number Publication date
DE102011106222A1 (de) 2012-12-13

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