EP1314792A1 - Acier inoxydable ferritique au soufre, utilisable pour des pieces ferromagnétiques - Google Patents

Acier inoxydable ferritique au soufre, utilisable pour des pieces ferromagnétiques Download PDF

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Publication number
EP1314792A1
EP1314792A1 EP02292873A EP02292873A EP1314792A1 EP 1314792 A1 EP1314792 A1 EP 1314792A1 EP 02292873 A EP02292873 A EP 02292873A EP 02292873 A EP02292873 A EP 02292873A EP 1314792 A1 EP1314792 A1 EP 1314792A1
Authority
EP
European Patent Office
Prior art keywords
steel
content
ferritic
weight composition
chromium
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.)
Withdrawn
Application number
EP02292873A
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German (de)
English (en)
French (fr)
Inventor
Christophe Bourgin
Danièle Cereda
Marie-Claude Orlandi
Benoít POLLET
Bernard Tetu
Christian Trombert
Corinne Viguet-Carrin
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
USINOR 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 USINOR SA filed Critical USINOR SA
Publication of EP1314792A1 publication Critical patent/EP1314792A1/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Withdrawn legal-status Critical Current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
    • C22C38/002—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
    • 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
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • 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
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1272—Final recrystallisation annealing

Definitions

  • the present invention relates to a ferritic sulfur stainless steel usable for ferromagnetic parts.
  • Ferritic stainless steels are characterized by a composition determined, the ferritic structure being in particular ensured, after rolling and cooling of the composition, by a heat treatment of annealing their conferring said structure.
  • the structure of the steel can be two-phase, ferritic and austenitic. If cooling is, for example energetic, the final structure is ferritic and martensitic. If it's slower, austenite decomposes partially into ferrite and carbides, but with a content carbide richer than the surrounding matrix, the austenite having dissolved at hot more carbon than ferrite. In both cases, an income or annealing must therefore be practiced on hot rolled and cooled steels to generate a totally ferritic structure. Income can be done at a temperature of around 820 ° C below the Ac1 alpha ⁇ gamma transition temperature, which generates a precipitation of carbides.
  • ferritic structure In the field of ferritic steels intended for an application using magnetic properties, the ferritic structure is obtained by limiting the amount of carbides, that's why ferritic stainless steels, developed in this area, have a carbon content less than 0.03%.
  • Steels which can be used for their magnetic properties such as for example in document US 5,769,974 which describes a manufacturing process a corrosion-resistant ferritic steel that can reduce the field value coercive of said steel.
  • the composition domains presented are very broad and do not not define a property optimization domain necessary for applications for ferromagnetic parts.
  • the steel used in the process is a resulfurized steel.
  • the steel obtained by the process which contains sulfur is however susceptible to corrosion.
  • the present invention aims to present a stainless steel of ferritic sulfur structure, usable for magnetic parts having high magnetic properties with very good properties machinability and corrosion resistance.
  • the invention also relates to a method of manufacturing a formed part. in a ferritic steel whose weight composition is confirmed by the invention and may be subject to modification after hot rolling and cooling of section of the wire drawing or drawing type, either after an optional heat treatment annealing either without annealing heat treatment.
  • Drawn or drawn steel can be subsequently annealed complementary recrystallization to perfect the magnetic properties of the room.
  • the single figure presents a ternary diagram giving the composition general of inclusions of aluminosilicates of lime.
  • the invention relates to a steel of the following general composition: C ⁇ 0.030% 1.0% ⁇ If ⁇ 3% 0.1% ⁇ Mn ⁇ 0.5% 10% ⁇ Cr ⁇ 13% 0% ⁇ Ni ⁇ 1% 0.03 ⁇ S ⁇ 0.5% 0% ⁇ P ⁇ 0.030% 0.2% ⁇ Mo ⁇ 2% 0% ⁇ N ⁇ 0.030% 0% ⁇ Ti ⁇ 0.5% 0% ⁇ Nb ⁇ 1%, 0% ⁇ Al ⁇ 100.10 -4 % 30.10-4% ⁇ Ca ⁇ 100.10 -4 % 50.10-4% ⁇ O ⁇ 150 10 -4 % the rest being iron and the impurities unavoidable in the production of steel.
  • compositions thus defined with tight forks allow to obtain the properties necessary for applications for ferromagnetic parts.
  • certain elements contained in the composition of a steel favor the appearance of the ferritic phase of structure cubic centered. These elements are called alpha-genes. Among these are especially chromium and molybdenum. Other elements called gamma-genes favor the appearance of the gamma-austenitic phase of cubic structure with faces centered. Among these elements are nickel, 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 1% nickel, less than 0.030% nitrogen.
  • Carbon is bad for corrosion and machinability. Generally the precipitates must be reduced because they constitute, from the point of view of the properties magnetic, an obstacle to the movements of the walls of Blocks.
  • Titanium and or niobium form compounds including titanium carbide and or niobium, which prevents the formation of chromium carbides and nitrides. They thereby promote corrosion resistance and in particular corrosion resistance welds, when a weld is necessary to produce a part magnetic.
  • Silicon is necessary to increase the resistivity of steel in order to reduce eddy currents; it is favorable for corrosion resistance. A content greater than 1.5% is preferable.
  • the steels according to the invention can also contain from 0.2% to 2% of molybdenum, an element that improves corrosion resistance and promotes ferrite formation.
  • ferritic stainless steels pose machinability issues.
  • ferritic steels a big disadvantage of ferritic steels is the bad conformation of the chip. They produce long, tangled chips, which are very difficult to fragment. This drawback can become very disadvantageous in machining modes where the chip is confined, such as in drilling deep, cutting.
  • ferritic sulfur stainless steel also contains, in its composition, by weight, more than 30 10 -4 % calcium and more than 50 10 -4 % oxygen.
  • FIG. 1 which is an Al 2 O 3 ternary diagram; SiO 2 ; CaO, the malleable oxides being chosen in the area of the triple point anorthite, gehlenite, pseudo-wollastonite.
  • the low manganese content promotes the formation of sulfide inclusions.
  • the malleable inclusions are likely to deform in the direction of rolling, while the hard oxides remain in the form of grains.
  • the inclusions chosen according to the invention significantly reduce the rate of breaks the drawn wire.
  • Ferritic steel according to the invention comprising malleable inclusions of hot silicoaluminates associated with manganese-chromium sulphides, can be polished with much more ease to obtain a polished surface finish improved.
  • Steel can be produced by electric fusion and then continuously cast to form blooms.
  • the blooms are then subjected to hot rolling for formation, by example of wire rod or bars.
  • Annealing can be performed to ensure processing operations at cold of the product, for example drawing and drawing, but it is not essential.
  • the steel can be subjected to an additional recrystallization annealing for restore and perfect the magnetic properties. Then follows a treatment of area.
  • the steels 1, 2 and 3 according to the invention have better magnetic characteristics than the reference steels A, B and D, as shown in the following table 2.
  • Steel Hc (A / m) Coercive field relative permeability ⁇ r Steel 1 117 2300 Steel 2 120 2200 Steel 3 125 2100 Ref A 184 1200 Ref B 177 1300 Ref C 115 2100 Ref D 140 1600
  • Steels 1, 2 and 3 have an excellent behavior in machining by bar turning, thanks to the combination of the sulfur content and the presence lime silicoaluminate inclusions due to calcium and oxygen contents.
  • the steel according to the invention is defined with analytical ranges tight, to optimize often incompatible properties: excellent properties in magnetism and machining, while having good behavior in corrosion due to their relatively limited sulfur content, compensated for the machinability, by their calcium and oxygen content and the presence of inclusions of lime silicoaluminates, combined with a low manganese content promoting presence of sulfides rich in chromium.
  • the steel according to the invention can be used particularly for the manufacture of ferromagnetic part such as, for example, parts of solenoid valves, injector for direct fuel injection system, central locking door in the automotive field or any application requiring parts of the magnetic core or inductor type.
  • ferromagnetic part such as, for example, parts of solenoid valves, injector for direct fuel injection system, central locking door in the automotive field or any application requiring parts of the magnetic core or inductor type.
  • sheet form it can be used in current transformers or magnetic shields.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP02292873A 2001-11-26 2002-11-19 Acier inoxydable ferritique au soufre, utilisable pour des pieces ferromagnétiques Withdrawn EP1314792A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0115240 2001-11-26
FR0115240A FR2832734B1 (fr) 2001-11-26 2001-11-26 Acier inoxydable ferritique au soufre, utilisable pour des pieces ferromagnetiques

Publications (1)

Publication Number Publication Date
EP1314792A1 true EP1314792A1 (fr) 2003-05-28

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EP02292873A Withdrawn EP1314792A1 (fr) 2001-11-26 2002-11-19 Acier inoxydable ferritique au soufre, utilisable pour des pieces ferromagnétiques

Country Status (11)

Country Link
US (1) US6921511B2 (zh)
EP (1) EP1314792A1 (zh)
JP (1) JP2003213382A (zh)
KR (1) KR20030043686A (zh)
CN (1) CN1424422A (zh)
BR (1) BR0204739A (zh)
CA (1) CA2409595A1 (zh)
FR (1) FR2832734B1 (zh)
MX (1) MXPA02011409A (zh)
TW (1) TW200300454A (zh)
ZA (1) ZA200209396B (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112522594A (zh) * 2019-09-19 2021-03-19 宝山钢铁股份有限公司 一种薄规格耐火耐候钢板/带及其生产方法

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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
US20070166183A1 (en) * 2006-01-18 2007-07-19 Crs Holdings Inc. Corrosion-Resistant, Free-Machining, Magnetic Stainless Steel
EP2211099A1 (en) * 2009-01-21 2010-07-28 José Luis Flores Torre Use of chromium-based stainless steel for manufacturing a domestic use and manual opening magnetic unit actuated by thermocouple or equvalent element
DE102009038386A1 (de) * 2009-08-24 2011-03-03 Stahlwerk Ergste Gmbh Weichmagnetischer ferritischer Chromstahl
KR101262516B1 (ko) 2010-11-10 2013-05-08 주식회사 포스코 자기 특성이 우수한 선재, 강선 및 이들의 제조방법
CN106636894A (zh) * 2016-11-25 2017-05-10 邢台钢铁有限责任公司 低碳铁素体软磁易切削不锈钢及其生产方法
CN107012401A (zh) * 2017-04-07 2017-08-04 邢台钢铁有限责任公司 一种低碳铁素体软磁不锈钢及其生产方法
JP6814724B2 (ja) * 2017-12-22 2021-01-20 大同特殊鋼株式会社 電磁弁
CN109011281A (zh) * 2018-06-26 2018-12-18 苏州海马消防设备制造有限公司 一种新型不锈钢消防水龙头
US20230085558A1 (en) * 2020-02-19 2023-03-16 Nippon Steel Stainless Steel Corporation Rod-shaped electromagnetic stainless steel material
CN117157423A (zh) 2020-10-15 2023-12-01 康明斯公司 燃料系统部件
CN113699447A (zh) * 2021-08-23 2021-11-26 承德建龙特殊钢有限公司 一种含硫易切削钢及其制备方法与应用

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Publication number Priority date Publication date Assignee Title
JPH06145908A (ja) * 1992-11-04 1994-05-27 Daido Steel Co Ltd カルシウム快削ステンレス鋼
EP0629714A1 (fr) * 1993-06-14 1994-12-21 Ugine Savoie Acier inoxydable martensitique à usinabilité améliorée
FR2720410A1 (fr) * 1994-05-31 1995-12-01 Ugine Savoie Sa Acier inoxydable ferritique à usinabilité améliorée.
EP0773306A1 (fr) * 1995-11-03 1997-05-14 UGINE SAVOIE (société anonyme) 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
JPH11172369A (ja) * 1997-12-05 1999-06-29 Kawasaki Steel Corp 溶接部の高温疲労特性に優れたＣｒ含有フェライト鋼
JP2000169944A (ja) * 1998-12-03 2000-06-20 Sanyo Special Steel Co Ltd 低温靱性に優れた電磁ステンレス鋼
JP2001011581A (ja) * 1999-06-25 2001-01-16 Sanyo Special Steel Co Ltd アウトガス特性に優れた快削ステンレス鋼
EP1130127A1 (fr) * 2000-03-03 2001-09-05 Ugine-Savoie Imphy Acier inoxydable austenitique a haute usinabilite, resulfure, et comportant une resistance a la corrosion amelioree.

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US3902898A (en) * 1973-11-08 1975-09-02 Armco Steel Corp Free-machining austenitic stainless steel
US3928088A (en) * 1973-11-09 1975-12-23 Carpenter Technology Corp Ferritic stainless steel
DE2820265C2 (de) * 1978-05-10 1982-02-25 Gkss - Forschungszentrum Geesthacht Gmbh, 2000 Hamburg Semipermeable asymmetrische Membranen für die Meerwasserentsalzung
US4711677A (en) * 1986-07-18 1987-12-08 The Garrett Corporation High temperature bushing alloy
US5788922A (en) * 1996-05-02 1998-08-04 Crs Holdings, Inc. Free-machining austenitic stainless steel
ES2185308T3 (es) * 1998-01-16 2003-04-16 Crs Holdings Inc Acero inoxidable martensitico de libre maquinado.

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06145908A (ja) * 1992-11-04 1994-05-27 Daido Steel Co Ltd カルシウム快削ステンレス鋼
EP0629714A1 (fr) * 1993-06-14 1994-12-21 Ugine Savoie Acier inoxydable martensitique à usinabilité améliorée
FR2720410A1 (fr) * 1994-05-31 1995-12-01 Ugine Savoie Sa Acier inoxydable ferritique à usinabilité améliorée.
EP0773306A1 (fr) * 1995-11-03 1997-05-14 UGINE SAVOIE (société anonyme) 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
JPH11172369A (ja) * 1997-12-05 1999-06-29 Kawasaki Steel Corp 溶接部の高温疲労特性に優れたＣｒ含有フェライト鋼
JP2000169944A (ja) * 1998-12-03 2000-06-20 Sanyo Special Steel Co Ltd 低温靱性に優れた電磁ステンレス鋼
JP2001011581A (ja) * 1999-06-25 2001-01-16 Sanyo Special Steel Co Ltd アウトガス特性に優れた快削ステンレス鋼
EP1130127A1 (fr) * 2000-03-03 2001-09-05 Ugine-Savoie Imphy Acier inoxydable austenitique a haute usinabilite, resulfure, et comportant une resistance a la corrosion amelioree.

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PATENT ABSTRACTS OF JAPAN vol. 1999, no. 11 30 September 1999 (1999-09-30) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 09 13 October 2000 (2000-10-13) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 16 8 May 2001 (2001-05-08) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112522594A (zh) * 2019-09-19 2021-03-19 宝山钢铁股份有限公司 一种薄规格耐火耐候钢板/带及其生产方法
CN112522594B (zh) * 2019-09-19 2022-10-21 宝山钢铁股份有限公司 一种薄规格耐火耐候钢板/带及其生产方法

Also Published As

Publication number Publication date
ZA200209396B (en) 2003-05-26
BR0204739A (pt) 2003-09-16
CN1424422A (zh) 2003-06-18
TW200300454A (en) 2003-06-01
FR2832734B1 (fr) 2004-10-08
MXPA02011409A (es) 2004-12-13
FR2832734A1 (fr) 2003-05-30
KR20030043686A (ko) 2003-06-02
US20030121575A1 (en) 2003-07-03
CA2409595A1 (fr) 2003-05-26
US6921511B2 (en) 2005-07-26
JP2003213382A (ja) 2003-07-30

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