WO1998054371A1 - Procede de fabrication en continu d'une bande en acier pour emboutissage presentant des proprietes de surface ameliorees - Google Patents
Procede de fabrication en continu d'une bande en acier pour emboutissage presentant des proprietes de surface ameliorees Download PDFInfo
- Publication number
- WO1998054371A1 WO1998054371A1 PCT/BE1998/000061 BE9800061W WO9854371A1 WO 1998054371 A1 WO1998054371 A1 WO 1998054371A1 BE 9800061 W BE9800061 W BE 9800061W WO 9854371 A1 WO9854371 A1 WO 9854371A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- zone
- strip
- treatment
- temperature
- steel strip
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0457—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0426—Hot rolling
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0436—Cold rolling
Definitions
- Steel is, without question, a material used in a very large number of industrial fields to manufacture elements of variable shapes and dimensions, in particular by using deformation and shaping techniques by deep and extra-deep drawing.
- the steel strips must have a particular texture which is the result of a certain number of constraints in their manufacturing process. Among other things, a certain range of coiling temperatures after hot rolling must be observed, a range of values of the reduction rate in cold rolling as well as various parameters defining the continuous annealing cycle operated subsequently.
- the process of the present invention makes it possible to manufacture steel strips from low carbon grades which have satisfactory drawing characteristics, even for deep or extra-deep drawing, while possessing surface properties without limitations. mentioned above, and it can be executed continuously, which is an advantage for its profitability in the context of an economical industrial application.
- the process for the continuous production of a steel strip for stamping with improved surface properties, object of the present invention in which a strip, having undergone hot rolling with end-of-rolling winding at a temperature between 500 and 800 ° C. and a cold rolling with a reduction rate of at least 30% and preferably 75%, undergoes a heating step, then a heat treatment according to the present invention, hereinafter called reactive annealing, making it possible on the one hand to recrystallize, that is to say the regeneration of the crystal lattice following the deformation, and on the other hand to carburize the strip at a temperature T, the two possibly being simultaneous or not depending on the type of final properties of the targeted strip, and finally said strip being subjected to cooling, is essentially characterized in that the reactive annealing in question is carried out completely or partially in a gaseous atmosphere comprising at least CO and H2 in volume concentrations satisfying the following relationship:
- the gaseous atmosphere also comprises another gas which has the object of simultaneously operating a surface enrichment treatment such as nitriding, boriding, sulfurization, oxidation, etc. .
- a surface layer of carbides is formed on the strip, the thickness of which is between 0.01 and 50 ⁇ m.
- the advantage of high fuel potentials is the realization at moderate temperature (eg 810 ° C.) of an austenitic phase in skin during the carburetion process while retaining a ferritic structure at heart.
- the austenitic phase is characterized by a greater solubility of the interstitial elements (C, N, B) and by a lower diffusion coefficient.
- the microstructure and the surface hardness are modulated by cooling the strip after reactive annealing at a speed of between 4 and 1000 ° C / second, preferably between 4 and 100 "C / second .
- the steel strip undergoes after carburization a heat treatment of diffusion in a low or non-fuel atmosphere before final cooling.
- the two preceding methods have the effect, on the one hand of increasing the possibilities of application of the method by making it possible to operate several surface treatments via separate plasmas, and on the other hand of providing an attractive solution in the case of differentiated treatments according to the faces of the steel strip according to specific subsequent applications.
- the steel strip passes first into a zone for preheating the strip, then into an independent carburetion treatment zone, then a heating zone with temperature maintenance, then undergoes cooling and finally an aging treatment whose existence is linked to the desired final properties.
- the steel strip passes first into a zone for preheating the strip, then to a zone for heating to temperature, then to a first holding zone. at temperature followed by an independent carburation treatment zone, then in a second temperature maintenance zone followed by cooling and finally an aging treatment, the existence of which is linked to the desired final properties.
- Figure 1 shows schematically the treatment path followed by the steel strip (B) in the context of the previous modality.
- the strip (B) passes first into a recrystallization zone (2), then into an independent treatment zone (3 ) by means of a reactive gas injected at the flow rate (Q), then passes into a diffusive treatment zone (4), and then leaves the heat treatment unit (1) in question.
- the values below have been collated for certain mechanical properties measured on four treated steels as well as on an untreated steel serving as a reference.
- the four steels T1, T2, T3 and T4 underwent reactive annealing at a temperature of 810 ° C in an atmosphere composed of 45% CO, 25% H2, balance N2, for periods varying from 1 to 300 seconds.
- t (s) duration of treatment in seconds
- HV1 Vickers surface hardness (load 1 kg)
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98916676A EP0985054B1 (fr) | 1997-05-27 | 1998-04-28 | Procede de fabrication en continu d'une bande en acier pour emboutissage presentant des proprietes de surface ameliorees |
DE69802525T DE69802525T2 (de) | 1997-05-27 | 1998-04-28 | Verfahren zum kontinuierlichen herstellen von stahlband mit verbesserten oberflächeneigenschaften zum tiefziehen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE9700459 | 1997-05-27 | ||
BE9700459A BE1011178A3 (fr) | 1997-05-27 | 1997-05-27 | Procede de fabrication en continu d'une bande en acier pour emboutissage presentant des proprietes de surface ameliorees. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998054371A1 true WO1998054371A1 (fr) | 1998-12-03 |
Family
ID=3890538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BE1998/000061 WO1998054371A1 (fr) | 1997-05-27 | 1998-04-28 | Procede de fabrication en continu d'une bande en acier pour emboutissage presentant des proprietes de surface ameliorees |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0985054B1 (fr) |
BE (1) | BE1011178A3 (fr) |
DE (1) | DE69802525T2 (fr) |
WO (1) | WO1998054371A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1371738A1 (fr) * | 2002-06-14 | 2003-12-17 | CENTRE DE RECHERCHES METALLURGIQUES-CENTRUM VOOR RESEARCH IN DE METALLURGIE Assoc. sans but lucratif-Ver. zonder winstoogmerk | Gestion des flux de gaz dans une section réactive |
EP1484419A2 (fr) * | 2003-06-05 | 2004-12-08 | ThyssenKrupp Stahl AG | Procédure de fabrication des bandes d'acier carburées |
US7096075B2 (en) * | 2003-04-21 | 2006-08-22 | International Business Machines Corporation | Apparatus, method and program for physical state controller |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0421087A2 (fr) * | 1989-08-09 | 1991-04-10 | KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. | Procédé pour la fabrication d'une tôle d'acier |
EP0444967A2 (fr) * | 1990-03-02 | 1991-09-04 | Kabushiki Kaisha Kobe Seiko Sho | Tôles d'acier laminées à froid ou tôles d'acier laminées à froid galvanisées par immersion pour emboutissage profond |
EP0559225A1 (fr) * | 1992-03-06 | 1993-09-08 | Kawasaki Steel Corporation | Tôle d'acier résistant à la traction, ayant une déformabilité de bordage par étirage excellente et son procédé de fabrication |
EP0589415A1 (fr) * | 1992-09-21 | 1994-03-30 | Kawasaki Steel Corporation | Feuille d'acier pour travailler par presses ayant une rigidité excellente et étant capable d'être satisfaisamment travaillée par presses |
EP0626467A1 (fr) * | 1992-10-15 | 1994-11-30 | Kawasaki Steel Corporation | Procede permettant de cementer en continu un feuillard d'acier |
-
1997
- 1997-05-27 BE BE9700459A patent/BE1011178A3/fr not_active IP Right Cessation
-
1998
- 1998-04-28 DE DE69802525T patent/DE69802525T2/de not_active Expired - Lifetime
- 1998-04-28 EP EP98916676A patent/EP0985054B1/fr not_active Expired - Lifetime
- 1998-04-28 WO PCT/BE1998/000061 patent/WO1998054371A1/fr active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0421087A2 (fr) * | 1989-08-09 | 1991-04-10 | KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. | Procédé pour la fabrication d'une tôle d'acier |
EP0444967A2 (fr) * | 1990-03-02 | 1991-09-04 | Kabushiki Kaisha Kobe Seiko Sho | Tôles d'acier laminées à froid ou tôles d'acier laminées à froid galvanisées par immersion pour emboutissage profond |
EP0559225A1 (fr) * | 1992-03-06 | 1993-09-08 | Kawasaki Steel Corporation | Tôle d'acier résistant à la traction, ayant une déformabilité de bordage par étirage excellente et son procédé de fabrication |
EP0589415A1 (fr) * | 1992-09-21 | 1994-03-30 | Kawasaki Steel Corporation | Feuille d'acier pour travailler par presses ayant une rigidité excellente et étant capable d'être satisfaisamment travaillée par presses |
EP0626467A1 (fr) * | 1992-10-15 | 1994-11-30 | Kawasaki Steel Corporation | Procede permettant de cementer en continu un feuillard d'acier |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1371738A1 (fr) * | 2002-06-14 | 2003-12-17 | CENTRE DE RECHERCHES METALLURGIQUES-CENTRUM VOOR RESEARCH IN DE METALLURGIE Assoc. sans but lucratif-Ver. zonder winstoogmerk | Gestion des flux de gaz dans une section réactive |
BE1014880A4 (fr) * | 2002-06-14 | 2004-05-04 | Ct Rech Metallurgiques Asbl | Gestion des flux de gaz dans une section reactive. |
US7096075B2 (en) * | 2003-04-21 | 2006-08-22 | International Business Machines Corporation | Apparatus, method and program for physical state controller |
EP1484419A2 (fr) * | 2003-06-05 | 2004-12-08 | ThyssenKrupp Stahl AG | Procédure de fabrication des bandes d'acier carburées |
EP1484419A3 (fr) * | 2003-06-05 | 2005-10-19 | ThyssenKrupp Stahl AG | Procédure de fabrication des bandes d'acier carburées |
Also Published As
Publication number | Publication date |
---|---|
BE1011178A3 (fr) | 1999-06-01 |
EP0985054B1 (fr) | 2001-11-14 |
EP0985054A1 (fr) | 2000-03-15 |
DE69802525T2 (de) | 2002-06-27 |
DE69802525D1 (de) | 2001-12-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1899490B1 (fr) | Bande en acier inoxydable austenitique presentant un aspect de surface brillant et d'excellentes caracteristiques mecaniques. | |
BE1017086A3 (fr) | Procede de recuit et preparation en continu d'une bande en acier a haute resistance en vue de sa galvanisation au trempe. | |
CA2949855C (fr) | Tole d'acier doublement recuite a hautes caracteristiques mecaniques de resistance et de ductilite, procede de fabrication et utilisation de telles toles | |
EP3445878A1 (fr) | Procédé de fabrication d'une pièce en acier inoxydable martensitique à partir d'une tôle | |
EP3486009B1 (fr) | Procédé de frittage d'un acier inoxydable austenitique | |
EP2986750A1 (fr) | Procede de traitement thermochimique comportant une unique phase de nitruration avant une cementation | |
FR2942241A1 (fr) | Procede de traitement de pieces pour ustensiles de cuisine | |
FR3032723A1 (fr) | Procede de fabrication d'une piece en acier faiblement allie nitrure | |
CA1259551A (fr) | Procede de traitement thermique pour la realisation de pieces en acier resistant a la corrosion | |
Eshkabilov et al. | Hardening of cutting tools by combined gas nitriding method | |
BE1011178A3 (fr) | Procede de fabrication en continu d'une bande en acier pour emboutissage presentant des proprietes de surface ameliorees. | |
EP1080243B1 (fr) | Procede de carbonitruration a basse pression de pieces en alliage metallique | |
US6328819B1 (en) | Method and use of an apparatus for the thermal treatment, in particular nitriding treatment, of metal workpieces | |
EP3538676A1 (fr) | Procédé de traitement thermique d'une pièce à usiner constituée d'un acier fortement allié | |
JP3064908B2 (ja) | 浸炭硬化時計部材もしくは装飾品類およびそれらの製法 | |
EP0213011A1 (fr) | Procédé pour la cémentation rapide et homogène d'une charge dans un four | |
EP1378577B1 (fr) | Procédé pour le traitement thermique d'une bande d'acier laminée à froid, apte au formage, et bande d'acier ainsi obtenue | |
JP2003286561A (ja) | 鋼板および鋼材の窒化方法 | |
JP2000073156A (ja) | 窒化ステンレス鋼材の製造方法 | |
JPS6169957A (ja) | 窒化処理における後処理方法 | |
EP0922777A1 (fr) | Produit plat, tel que tÔle, d'un acier à haute limite d'élasticité montrant une bonne ductilité et procédé de fabrication de ce produit | |
EP0159222A1 (fr) | Procédé de traitement superficiel de pièces en acier ou en fonte par bombardement ionique | |
JP2014505790A (ja) | 駆動ベルト金属リング構成部材の製造方法のための熱処理プロセス | |
FR2742449A1 (fr) | Procede de galvanisation de tole d'acier contenant des elements d'addition oxydables | |
Ciofu et al. | Changes of Structure and Physical-Mechanical Properties in Alloy Steels Thermochemically Treated by Plasma Nitriding |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): JP KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1998916676 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: JP Ref document number: 1999500024 Format of ref document f/p: F |
|
WWP | Wipo information: published in national office |
Ref document number: 1998916676 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1998916676 Country of ref document: EP |