EP0653494B1 - Bandes étroites en acier à haute teneur en carbone et procédé de fabrication de ce type de bandes - Google Patents
Bandes étroites en acier à haute teneur en carbone et procédé de fabrication de ce type de bandes Download PDFInfo
- Publication number
- EP0653494B1 EP0653494B1 EP94401900A EP94401900A EP0653494B1 EP 0653494 B1 EP0653494 B1 EP 0653494B1 EP 94401900 A EP94401900 A EP 94401900A EP 94401900 A EP94401900 A EP 94401900A EP 0653494 B1 EP0653494 B1 EP 0653494B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- rolling
- temperature
- hot
- cold
- 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
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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C21D2211/009—Pearlite
-
- 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
- C21D2261/00—Machining or cutting being involved
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation 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
- 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
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
Definitions
- the present invention relates to a method manufacturing narrow strips of high carbon steel, between 0.30 and 1%, in particular between 0.35 and 0.70% and having a good rolling ability to cold.
- strip This type of strip, called strip, are bought from steelmakers by processors narrow bands called foil strips, which transform them in particular by re-rolling to cold to reduce the thickness and make them usable for example by equipment manufacturers automobiles.
- strip train consisting of a succession of narrow rolling mills.
- the hot rolled strip thus obtained is then pickled, then cold rolled on a train cold rolling of strips made up of rolling mills narrow cold.
- This strip manufacturing sector thin allows to obtain strips having good aptitude for cold rolling, good regularity thick over their entire length and a large homogeneity of the profile.
- hot rolling mill trains or cold intended for rolling narrow strips that is to say with a width of between 150 and 600 mm, are not very productive, which leads to a cost price high straps.
- the main drawback of this sector lies in the fact that at the time of the engagement of the split band in the cold rolling mill, breakage occurs tape, which requires stopping production and scrapping of this tape.
- This rupture phenomenon is due, on the one hand, to the metallurgical structure of the split strip which is a lamellar ferrito-pearlitic structure and, on the other hand, to the heterogeneity of this band split.
- the wide band from the train continuous hot has a ferrito-pearlitic structure coarse lamellar in the center and a finer lamellar ferritic-pearlitic structure level of the banks. It also has a difference thick between the center and the banks, which are thinner than the center.
- the second narrow strip having a coarse lamellar structure can be difficult cold rolled, especially in the case of a high grade carbon.
- the first and third narrow bands have an asymmetrical profile which is penalizing for the transformer because it is difficult to keep these strips in the cold rolling mill stand, thus forcing the transformer to slow down sharply rolling speed to avoid breakage of these bands.
- processors systematically carry out a globulation annealing of the split strips and hot rolled before cold rolling of these bands.
- This globulation annealing does not allow so far as to overcome the problems thickness heterogeneity which is difficult to catch up during cold rolling so that tight thickness tolerances cannot be guarantees.
- the narrow strip manufactured according to the invention is a high carbon steel strip between 0.30 and 1%, in particular between 0.35 and 0.70% and especially between 0.65 and 0.70%, and having a good rolling ability to cold.
- This narrow strip or strip is obtained by slitting a wide strip hot rolled, pickled, then cold rolled and annealed.
- the narrow band according to the invention is obtained by hot rolling a slab of steel or a steel ingot on a continuous train at hot.
- a hot rolled strip is obtained, of which the metallurgical structure is ferrito-pearlitic lamellar, coarse in the center of the band, and thinner at the edges of this strip.
- the temperature at the end of hot rolling is higher than the austenite-ferrite AC 3 transformation temperature in order to avoid hot rolling. in the intercritical field, which would generate problems for the continuation of the strip treatments, in particular its aptitude for subsequent cold rolling.
- the temperature at the end of hot rolling is higher than the austenite-cementite transformation temperature AC m .
- the wide strip is pickled with hydrochloric acid or sulfuric acid by passing through pickling tanks and rinsing.
- the purpose of the stripping operation is to remove calamines and oxides from the operation of hot rolling.
- the broadband is then directly cold rolled without prior annealing operation.
- the banks of the wide strip have a ferrito-pearlitic structure thin lamellar less fragile than a structure coarse lamellar ferrito-pearlitic and thereby that this strip, although being of non constant thickness between the center and the banks, presents a heterogeneity symmetrical in thickness.
- the wide strip When the wide strip has been cold rolled on a cold train to reduce its thickness, it undergoes a heat treatment called annealing of globulization which allows a transformation of the metallurgical structure lamellar in globular structure.
- the globalization annealing is a basic annealing which consists in subjecting the broadband to a temperature between 650 and 720 ° C for 2 to 30 hours and from preferably at a temperature between 680 and 700 ° C for 5 to 15 hours, the annealing time being inversely proportional to the annealing temperature.
- the annealing of globulization consists of placing the wide strip in the form of coils in an annealing oven which allows to raise its temperature from 60 ° C per hour up to 690 ° C and to maintain the temperature for 10 hours.
- the wide cold rolled strip and annealed can be split into narrow strips intended to be sold to processors, thus allowing to them to work directly the narrow bands.
- these narrow bands have a very good attitude to cold rolling, the structure metallurgical of these bands being globular.
- these narrow bands have a good regularity of thickness over the entire length and a negligible asymmetry on the profile.
- Another advantage of the invention lies in the possibility of applying a maximum reduction rate thickness, of the order of 60 to 75%, during the operation cold rolling before annealing globulization.
- the thickness of the wide strip after rolling cold remains too high in relation to demand, it is possible, after the annealing of globulization, perform at least a second rolling operation cold on a wide continuous train.
- a simple recrystallization annealing is carried out at a temperature between 650 and 720 ° C before splitting the wide strip into narrow strips.
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)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Carbon And Carbon Compounds (AREA)
Description
- on lamine à chaud une brame ou un lingot pour obtenir une bande large laminée à chaud,
- on décape la bande large laminée à chaud,
- on lamine à froid la bande large laminée à chaud et décapée pour en réduire l'épaisseur,
- on effectue un recuit de globulisation de la bande large,
- et on refend ladite bande large pour obtenir lesdites bandes étroites.
- entre le recuit de globulisation et le refendage de la bande large, on effectue au moins un relaminage à froid de ladite bande large pour obtenir l'épaisseur désirée et un recuit de recristallisation après chaque relaminage à froid,
- la température de fin de laminage à chaud est supérieure à la température de transformation austénite-ferrite AC3 pour une teneur en carbone comprise entre 0,30 et 0,80 %,
- la température de fin de laminage à chaud est supérieure à la température de transformation austénite-cémentite ACm pour des teneurs en carbone comprises entre 0,80 et 1 %,
- le décapage est un décapage à l'acide chlorhydrique ou à l'acide sulfurique,
- on effectue le recuit de globulisation en maintenant la bande large à une température comprise entre 650 et 720°C pendant 2 à 30 heures, et de préférence à une température comprise entre 680 et 700°C pendant 5 à 15 heures,
- la montée en température de la bande large pour l'amener à sa température de recuit de globulisation est de 60°C par heure,
- on effectue le recuit de recristallisation à une température comprise entre 650 et 720°C.
Claims (9)
- Procédé de fabrication de bandes étroites, de largeur comprise entre 150 et 600mm et en acier à haute teneur en carbone comprise entre 0,30 et 1 %, en particulier entre 0,65 et 0,70 %, et possédant une bonne aptitude au laminage à froid, procédé dans lequel :on lamine à chaud une brame ou un lingot pour obtenir une bande large laminée à chaud,on décape la bande large laminée à chaud,on lamine à froid la bande large laminée à chaud et décapée pour en réduire l'épaisseur,on effectue un recuit de globulisation,et on refend la bande large pour obtenir lesdites bandes étroites.
- Procédé selon la revendication 1, caractérisé en ce qu'entre le recuit de globulisation et le refendage de la bande large, on effectue au moins un relaminage à froid de ladite bande large pour obtenir l'épaisseur désirée et un recuit de recristallisation après chaque relaminage à froid.
- Procédé de fabrication de bandes étroites en acier à teneur en carbone comprise entre 0,30 et 0,80 % selon la revendication 1, caractérisé en ce que la température de fin de laminage à chaud est supérieure à la température de transformation austénite-ferrite AC3.
- Procédé de fabrication de bandes étroites en acier à teneur en carbone comprise entre 0,80 et 1 % selon la revendication 1, caractérisé en ce que la température de fin de laminage à chaud est supérieure à la température de transformation austénite-cémentite ACm.
- Procédé selon la revendication 1, caractérisé en ce que le décapage est un décapage à l'acide chlorhydrique.
- Procédé selon la revendication 1, caractérisé en ce que le décapage est un décapage à l'acide sulfurique.
- Procédé selon la revendication 1, caractérisé en ce que l'on effectue le recuit de globulisation en maintenant la bande large à une température comprise entre 650 et 720°C pendant 2 à 30 heures, de préférence entre 680 et 700°C pendant 5 à 15 heures.
- Procédé selon la revendication 7, caractérisé en ce que la montée en température de la bande large pour l'amener à sa température de recuit de globulisation est de 60°C par heure.
- Procédé selon la revendication 2, caractérisé en ce que l'on effectue le recuit de recristallisation à une température comprise entre 650 et 720°C.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9313515 | 1993-11-12 | ||
FR9313515A FR2712305B1 (fr) | 1993-11-12 | 1993-11-12 | Bandes étroites en acier à haute teneur en carbone et procédé de fabrication de ce type de bandes. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0653494A1 EP0653494A1 (fr) | 1995-05-17 |
EP0653494B1 true EP0653494B1 (fr) | 1999-05-26 |
Family
ID=9452794
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94401900A Expired - Lifetime EP0653494B1 (fr) | 1993-11-12 | 1994-08-25 | Bandes étroites en acier à haute teneur en carbone et procédé de fabrication de ce type de bandes |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0653494B1 (fr) |
AT (1) | ATE180515T1 (fr) |
DE (1) | DE69418677T2 (fr) |
ES (1) | ES2134326T3 (fr) |
FR (1) | FR2712305B1 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE793276A (fr) * | 1971-12-22 | 1973-06-22 | Uss Eng & Consult | Procede pour fabriquer des limes plates en acier |
JPH079043B2 (ja) * | 1987-01-12 | 1995-02-01 | 川崎製鉄株式会社 | 熱交換器用鋼板の製造方法 |
DD275073A1 (de) * | 1988-08-30 | 1990-01-10 | Freiberg Bergakademie | Verfahren zur herstellung hoehergekohlter stahlbaender |
DE3934037C1 (fr) * | 1989-10-12 | 1991-02-14 | Thyssen Stahl Ag, 4100 Duisburg, De | |
JPH04116137A (ja) * | 1990-09-03 | 1992-04-16 | Sumitomo Metal Ind Ltd | 高靭性高炭素冷延鋼板とその製造方法 |
-
1993
- 1993-11-12 FR FR9313515A patent/FR2712305B1/fr not_active Expired - Fee Related
-
1994
- 1994-08-25 EP EP94401900A patent/EP0653494B1/fr not_active Expired - Lifetime
- 1994-08-25 DE DE69418677T patent/DE69418677T2/de not_active Expired - Fee Related
- 1994-08-25 AT AT94401900T patent/ATE180515T1/de not_active IP Right Cessation
- 1994-08-25 ES ES94401900T patent/ES2134326T3/es not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0653494A1 (fr) | 1995-05-17 |
FR2712305A1 (fr) | 1995-05-19 |
DE69418677T2 (de) | 1999-09-30 |
ES2134326T3 (es) | 1999-10-01 |
DE69418677D1 (de) | 1999-07-01 |
ATE180515T1 (de) | 1999-06-15 |
FR2712305B1 (fr) | 1996-02-02 |
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