EP1299569B1 - Ferritischer rostfreier stahl verwendbar für ferromagnetische werkstücke - Google Patents

Ferritischer rostfreier stahl verwendbar für ferromagnetische werkstücke Download PDF

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Publication number
EP1299569B1
EP1299569B1 EP01951783A EP01951783A EP1299569B1 EP 1299569 B1 EP1299569 B1 EP 1299569B1 EP 01951783 A EP01951783 A EP 01951783A EP 01951783 A EP01951783 A EP 01951783A EP 1299569 B1 EP1299569 B1 EP 1299569B1
Authority
EP
European Patent Office
Prior art keywords
steel
ferritic
composition
steels
ferritic stainless
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
EP01951783A
Other languages
English (en)
French (fr)
Other versions
EP1299569A1 (de
Inventor
Etienne Havette
Christophe Bourgin
Benoít POLLET
Jean Lamontanara
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.)
Ugitech SA
Original Assignee
Ugine Savoie Imphy SA
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 Ugine Savoie Imphy SA filed Critical Ugine Savoie Imphy SA
Publication of EP1299569A1 publication Critical patent/EP1299569A1/de
Application granted granted Critical
Publication of EP1299569B1 publication Critical patent/EP1299569B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • 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
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys

Definitions

  • the present invention relates to a usable ferritic stainless steel for ferromagnetic parts.
  • Ferritic stainless steels are characterized by their composition determined, the ferritic structure being ensured in particular, after rolling and cooling the composition by annealing heat treatment conferring on them said structure.
  • the structure of the steel can be biphasic, ferritic and austenitic. If the cooling is, for example energetic, the final structure is ferritic and martensitic. If he is slower, the austenite is broken down partly into ferrite and carbides, but with a carbide content richer than the surrounding matrix, the austenite having hot solubilized more carbon than ferrite. In both cases, a income or annealing must therefore be practiced on hot-rolled steels and cooled to generate a completely ferritic structure. Income can be at a temperature of about 820 ° C lower than the Ac1 temperature of alpha ⁇ gamma transition, which causes a precipitation of carbides.
  • ferritic structure In the field of ferritic steels for one application using magnetic properties, the ferritic structure is obtained by limiting the amount of carbides, this is why stainless steels ferritics, developed in this area, have a carbon content less than 0.02%.
  • the present invention aims to present a stainless steel of ferritic structure usable for magnetic parts having high magnetic properties and having good properties of implementation in terms of cold stamping and good machinability properties.
  • the invention also relates to a method for producing a steel characterized in that the weight composition is subjected, after hot rolling and cooling, annealing heat treatment then to a section modification of the drawing or drawing type.
  • Drawn or drawn steel may be subsequently annealed complementary recrystallization to perfect the magnetic properties of the room.
  • certain elements contained in the composition of a steel favor the appearance of the ferritic phase of centered cubic structure.
  • These elements are called alpha-genes. Among these include chromium and molybdenum.
  • Other elements said gamma-genes promote the appearance of the gamma-austenitic phase of cubic structure with centered faces.
  • These elements include nickel as well than carbon and nitrogen. It is therefore necessary to reduce the content of these elements and it is for these reasons that the steel according to the invention comprises in its composition less than 0.030% of carbon, less than 0.5% of nickel, less than 0.030% nitrogen.
  • Carbon is bad for striking, corrosion and machinability.
  • precipitates must be reduced because they constitute obstacles to movements of the walls of Blocks.
  • nickel, manganese, copper in the composition due to the industrial development of steel are only residual elements that we seek to reduce and even to eliminate.
  • Titanium and / or niobium form compounds whose carbide titanium and / or niobium, which avoids the formation of carbides and nitrides chromium. They favor, therefore, the resistance to corrosion and in particular the holding corrosion of welds.
  • Sulfur is limited to optimize the behavior of steel in the field of cold stamping and to optimize magnetic properties.
  • Silicon is needed to increase the resistivity of steel in order to reduce eddy currents, and is favorable for corrosion resistance.
  • the steels according to the invention may also preferably contain from 0.2% to 3% molybdenum, an element that improves the resistance to corrosion and promotes formation of ferrite.
  • ferritic stainless steels pose problems of machinability.
  • ferritic steels a big drawback of ferritic steels is the bad conformation of the chip. They produce long, entangled chips that are very difficult to fragment. This disadvantage can become very penalizing in machining modes where the chip is confined, for example in deep drilling, bucking.
  • a solution to overcome the problems of machining steels ferritics is to introduce sulfur into their composition or elements type lead, tellurium, selenium that adversely affect the mechanical properties of cold deformation of corrosion resistance, or the properties magnetic.
  • Said ferritic steels usually contain Hard inclusions of chromite type (Cr Mn, AI Ti) O, alumina (AIMg) O, silicate (SiMn) O, abrasive for cutting tools.
  • the ferritic stainless steel further contains in its composition by weight more than 10 -4 % calcium and more than 70 10 -4 % oxygen.
  • the controlled and voluntary introduction of calcium and oxygen favors in ferritic steel the formation of malleable oxides of the lime silicoaluminates type, the malleable oxides being preferably selected from the region of the triple anorthite point, gehlenite, pseudo-wollastonite, of the ternary Al 2 O 3 diagram; SiO 2 ; CaO.
  • a steel of ferritic structure according to the invention does not containing no or very little sulfur, has a machining ensuring its use in industrial turning, while presenting increased resistance to corrosion.
  • malleable oxides are likely to deform in the direction of rolling, while the hard oxides they replace remain in grain shape.
  • the inclusions chosen according to the invention substantially reduce the breakage rate of drawn wire.
  • Ferritic steel, according to the invention comprising malleable inclusions, can be polished with much greater ease for obtaining a state of polished surface improved.
  • the steel is made by electrical fusion and then poured continuously for to form blooms.
  • the blooms are then subjected to hot rolling for forming, for example wire rod or bars.
  • the steel is subjected to a supplementary annealing of recrystallization for restore and perfect the magnetic properties.
  • the steels according to the invention have better magnetic characteristics than the reference steels, as shown in Table 2 below.
  • Steel Hc (A / m) Coercive field Steel 1 109 Steel 2 115 Ref A 184 Ref B 177
  • Steel 2 behaves very well in the field of machining bar turning, despite a limited sulfur content. This is explained by the presence of calcium and oxygen.
  • Steel 1 has a very good ability to cold stamp, because of of its low sulfur content. On previously struck coins, the finishing machining by turning is carried out correctly, without particular problem.
  • the steel according to the invention can be used particularly for the manufacture ferromagnetic parts such as, for example, parts of solenoid valves, injector for gasoline direct injection system, closures centralized door in the automotive field or any application requiring parts of the magnetic core type or inductor. Under the sheet form, it can be used in current transformers or magnetic shielding.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnetism (AREA)
  • Soft Magnetic Materials (AREA)
  • Heat Treatment Of Steel (AREA)
  • Hard Magnetic Materials (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Compounds Of Iron (AREA)

Claims (7)

  1. Ferritischer rostfreier Stahl verwendbar für ferromagnetische Werkstücke, dadurch gekennzeichnet, dass seine Gewichtszusammensetzung folgendermaßen aussieht:
    0 % < C ≤ 0,030 %
    1 % ≤ Si ≤ 3 %
    0 %< Mn ≤ 0,5 %
    10 % ≤ Cr ≤ 13 %
    0 % < Ni ≤ 0,5 %
    0 % < Mo ≤ 3 %
    N ≤ 0,030 %
    Cu ≤ 0,5 %
    Ti ≤ 0,5 %
    Nb ≤ 1%
    Ca > 30*10-4%
    O > 70* 10-4%
    S ≤ 0,030 %
    P ≤ 0,030 %
    wobei der Rest Eisen und die bei der Stahlverarbeitung unvermeidlichen Verunreinigungen sind.
  2. Stahl nach Anspruch 1, dadurch gekennzeichnet, dass das Verhältnis zwischen dem Calcium - und Sauerstoffgehalt Ca / O
       0,2 ≤ Ca / O ≤ 0,6 ist.
  3. Stahl nach Anspruch 1, dadurch gekennzeichnet, dass er Einschlüsse von Kalziumaluminimmsilicat vom Typ Anorthit und / oder Pseudowollastonit und / oder Gehlenit enthält.
  4. Stahl nach Anspruch 1, dadurch gekennzeichnet, dass seine Gewichtszusammensetzung folgendermaßen aussieht:
    C ≤ 0,012 %
    1 % ≤ Si ≤ 3 %
    0 % ≤ Mn ≤ 0,4 %
    10 % ≤ Cr ≤ 13 %
    0 % ≤ Ni ≤0,2 %
    0,2 % ≤ Mo ≤ 2 %
    N ≤ 0,015 %
    Cu ≤ 0,2 %
    Ti ≤ 0,2 %
    Nb ≤ 1%
    Ca ≥ 30* 10-4 %
    O ≥ 70* 10-4%
    S ≤ 0,003 %
    P ≤ 0,030 %
    wobei der Rest Eisen und die bei der Stahlverarbeitung unvermeidlichen Verunreinigungen sind.
  5. Stahl nach Anspruch 1, dadurch gekennzeichnet, dass seine Gewichtszusammensetzung folgendermaßen aussieht :
    0 % < C ≤ 0,012 %
    1 % ≤ Si ≤ 3 %
    0 % ≤ Mn ≤ 0,4 %
    10 % ≤ Cr ≤ 13 %
    0% < Ni ≤ 0,2 %
    0,2 % ≤ Mo ≤ 2 %
    N ≤ 0,015 %
    Cu ≤ 0,2 %
    Ti ≤ 0,2 %
    Nb ≤ 1%
    Ca ≥ 30* 10-4%
    O ≥ 70 *10-4%
    0,015 ≤ S ≤ 0,03 %
    P ≤ 0,030%
    wobei der Rest Eisen und die bei der Stahlverarbeitung unvermeidlichen Verunreinigungen sind.
  6. Verarbeitungsverfahren für einen ferritischen Stahl nach einem Ansprüche 1 bis 5, dadurch gekenneichnet, dass der Stahl nach dem Warm - Walzen und der Abkühlung einer thermischen Glühbehandlung und dann einer Querschnittsveränderung durch Drahtziehen oder Ziehen unterzogen wird.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass der durch Drahtziehen bzw. Ziehen behandelte Stahl anschliessend einem zusätzlichen Rekristallisierungsglühen unterzogen werden kann, um die magnetischen Eigenschaften des Werkstücks zu vervollständigen.
EP01951783A 2000-07-12 2001-07-10 Ferritischer rostfreier stahl verwendbar für ferromagnetische werkstücke Expired - Lifetime EP1299569B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0009152 2000-07-12
FR0009152A FR2811683B1 (fr) 2000-07-12 2000-07-12 Acier inoxydable ferritique utilisable pour des pieces ferromagnetiques
PCT/FR2001/002214 WO2002004689A1 (fr) 2000-07-12 2001-07-10 Acier inoxydable ferritique utilisable pour des pieces ferromagnetiques

Publications (2)

Publication Number Publication Date
EP1299569A1 EP1299569A1 (de) 2003-04-09
EP1299569B1 true EP1299569B1 (de) 2004-06-16

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ID=8852438

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EP01951783A Expired - Lifetime EP1299569B1 (de) 2000-07-12 2001-07-10 Ferritischer rostfreier stahl verwendbar für ferromagnetische werkstücke

Country Status (14)

Country Link
US (2) US6821358B2 (de)
EP (1) EP1299569B1 (de)
JP (1) JP2004502867A (de)
KR (1) KR20020029408A (de)
CN (1) CN1202275C (de)
AT (1) ATE269426T1 (de)
AU (1) AU7263501A (de)
BR (1) BR0106950A (de)
CA (1) CA2384754A1 (de)
DE (1) DE60103899T2 (de)
FR (1) FR2811683B1 (de)
MX (1) MXPA02002629A (de)
WO (1) WO2002004689A1 (de)
ZA (1) ZA200201897B (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9943847B2 (en) 2002-04-17 2018-04-17 Cytonome/St, Llc Microfluidic system including a bubble valve for regulating fluid flow through a microchannel
JP4519543B2 (ja) * 2004-07-01 2010-08-04 新日鐵住金ステンレス株式会社 耐食性，冷間加工性および靱性に優れる磁性を有する安価ステンレス鋼線及びその製造方法
US9260693B2 (en) 2004-12-03 2016-02-16 Cytonome/St, Llc Actuation of parallel microfluidic arrays
EP2211099A1 (de) * 2009-01-21 2010-07-28 José Luis Flores Torre Verwendung von chrombasiertem Edelstahl zur Herstellung einer Haushaltsanwendung und manuell zu öffnende Magneteinheit, die mit einer Wärmekupplung oder einem äquivalenten Element betätigt wird
WO2013072124A1 (en) * 2011-11-14 2013-05-23 Nv Bekaert Sa Steel wire for magnetic field absorption
EP2886890B1 (de) * 2013-12-18 2019-06-26 Skf Magnetic Mechatronics Schubscheibe, Magnetlager und Vorrichtung
DE202014004267U1 (de) * 2014-05-23 2014-07-04 Few Fahrzeugelektrikwerk Gmbh & Co. Kg Elektrisches Anschlusselement zum Befestigen, insbesondere Auflöten auf eine Glasscheibe sowie Bandlitzenmischgeflecht
FR3047254B1 (fr) * 2016-02-02 2018-02-16 Vallourec Tubes France Composition d'aciers aux proprietes anti-cokage ameliorees
JP6574739B2 (ja) * 2016-07-05 2019-09-11 秋山精鋼株式会社 フェライト系ステンレス鋼棒材の保磁力調整方法
JP6912369B2 (ja) * 2017-12-22 2021-08-04 日鉄ステンレス株式会社 耐銹性に優れたフェライト系ステンレス鋼
KR102279909B1 (ko) * 2019-11-19 2021-07-22 주식회사 포스코 고투자율 페라이트계 스테인리스강
ES2897523B2 (es) 2021-08-10 2022-07-18 Advanced Thermal Devices S L Cátodo basado en el material C12A7:e ''electride'' para la emisión termiónica de electrones y procedimiento para el empleo del mismo

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JPS55138057A (en) * 1979-04-12 1980-10-28 Daido Steel Co Ltd Stainless steel for cold header
JP3312401B2 (ja) * 1992-11-04 2002-08-05 大同特殊鋼株式会社 カルシウム快削ステンレス鋼
FR2706489B1 (fr) * 1993-06-14 1995-09-01 Ugine Savoie Sa Acier inoxydable martensitique à usinabilité améliorée.
FR2720410B1 (fr) * 1994-05-31 1996-06-28 Ugine Savoie Sa Acier inoxydable ferritique à usinabilité améliorée.
JP3116156B2 (ja) * 1994-06-16 2000-12-11 新日本製鐵株式会社 耐食性および溶接性に優れた鋼管の製造方法
US5851316A (en) * 1995-09-26 1998-12-22 Kawasaki Steel Corporation Ferrite stainless steel sheet having less planar anisotropy and excellent anti-ridging characteristics and process for producing same
FR2740783B1 (fr) * 1995-11-03 1998-03-06 Ugine Savoie Sa Acier inoxydable ferritique utilisable pour la production de laine d'acier
US5769974A (en) * 1997-02-03 1998-06-23 Crs Holdings, Inc. Process for improving magnetic performance in a free-machining ferritic stainless steel
TW452599B (en) * 1997-08-05 2001-09-01 Kawasaki Steel Co Ferritic stainless steel plate excellent in deep drawability and anti-ridging property and production method thereof
JP3508520B2 (ja) * 1997-12-05 2004-03-22 Ｊｆｅスチール株式会社 溶接部の高温疲労特性に優れたＣｒ含有フェライト鋼
TW496903B (en) * 1997-12-19 2002-08-01 Armco Inc Non-ridging ferritic chromium alloyed steel
JP3941267B2 (ja) * 1998-11-02 2007-07-04 Ｊｆｅスチール株式会社 耐酸化性および耐粒界腐食性に優れた高耐食性クロム含有鋼

Also Published As

Publication number Publication date
DE60103899T2 (de) 2005-06-30
KR20020029408A (ko) 2002-04-18
EP1299569A1 (de) 2003-04-09
US20020129873A1 (en) 2002-09-19
AU7263501A (en) 2002-01-21
US20050279425A1 (en) 2005-12-22
CN1202275C (zh) 2005-05-18
ZA200201897B (en) 2003-03-07
CA2384754A1 (fr) 2002-01-17
JP2004502867A (ja) 2004-01-29
BR0106950A (pt) 2002-05-21
FR2811683A1 (fr) 2002-01-18
US6821358B2 (en) 2004-11-23
DE60103899D1 (de) 2004-07-22
ATE269426T1 (de) 2004-07-15
WO2002004689A1 (fr) 2002-01-17
FR2811683B1 (fr) 2002-08-30
MXPA02002629A (es) 2002-07-30
CN1386144A (zh) 2002-12-18

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