EP1204770B1 - Procede de fabrication d'une bande d'acier en continu - Google Patents
Procede de fabrication d'une bande d'acier en continu Download PDFInfo
- Publication number
- EP1204770B1 EP1204770B1 EP00943485A EP00943485A EP1204770B1 EP 1204770 B1 EP1204770 B1 EP 1204770B1 EP 00943485 A EP00943485 A EP 00943485A EP 00943485 A EP00943485 A EP 00943485A EP 1204770 B1 EP1204770 B1 EP 1204770B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- aqueous bath
- temperature
- steel strip
- bath
- process according
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
Definitions
- the present invention relates to a continuous steel strip manufacturing process, and more particularly a method of cooling a steel strip in a line continuous annealing and / or coating.
- the cooling transition temperature is the strip temperature for which the strip is cooled by the quench bath goes from heat exchange through a continuous vapor film to heat exchange through a discontinuous layer of vapor bubbles.
- the cooling transition temperature is about 320 ° C.
- the steel strip leaves the quench bath at a temperature of the order of 350 ° C; it is then either subjected to an overaging treatment without Intermediate cooling, i.e. cooled down to room temperature, i.e. up to less than 100 ° C by other suitable means.
- a disadvantage of this method is that its cooling rate is limited, by example of the order of 50 ° C / s to 60 ° C / s for a steel strip 0.8 mm thick. In addition, it does not allow, without an auxiliary cooling system, a cooling of the steel strip to less than 100 ° C (full quench) while retaining a satisfactory flatness of the strip.
- Document DE-A-27 27 744 relates to a process for heat treatment in continuous of cold rolled sheets.
- a rolled steel sheet is subjected to cold to a heating operation aimed at bringing the sheet to a temperature above its recrystallization temperature and a cooling operation consisting of immerse the heated sheet in an aqueous bath.
- This aqueous bath can in particular contain surfactants whose role is to facilitate the drying of the sheet and elimination of deposits, for example by blowing. No indication is given as to the amount of surfactants needed or as to the tension superficial that must be reached.
- a method of manufacturing a steel strip continuously in which the steel strip is immersed, at a temperature between 700 ° C and 850 ° C, in an aqueous bath maintained at a temperature above ambient temperature, is characterized in that at least one surfactant capable of lowering the surface tension of said aqueous bath by at least 20 dynes / cm is added to said aqueous bath, in that the said surfactant is added in a proportion of between 0.5 g / l and 50 g / l, and in this way that the surface tension of said aqueous bath is lowered to a value less than 30 dynes / cm.
- surfactants capable of withstand temperatures above 110 ° C, and preferably also pressures at least 2 bar.
- an aqueous bath consisting of a water bath boiling, known per se, which can have a depth of several meters.
- the bill such surface-active substances in a boiling water bath, in accordance with the invention allows the cooling transition temperature to be lowered, and therefore to extend the cooling of the steel strip below the aforementioned temperature of 320 ° C. according to the surfactant used, the cooling transition temperature may thus be lowered to around 125 ° C.
- These values correspond to a band of 0.8 mm thick; they may vary slightly in the range of strip thicknesses concerned.
- an aqueous bath is used at a temperature from 50 ° C to 90 ° C.
- a lowering of the temperature of the aqueous bath compared to a quenching in boiling water, has the effect of increasing the heat transfer coefficient between the steel strip and the aqueous bath. This results in an increase in the speed of cooling of the steel strip, which is favorable for the production of steel strips resistance steel.
- the cooling rates obtained in a liquid bath including the temperature is between 50 and 90 ° C are also much higher than those obtained in cooling systems using only gas flows.
- the cooling rate goes from around 50 to 60 ° C / s for a cooling with boiling water, at around 150 to 200 ° C / s for cooling by water at 80 ° C, in the case of a steel strip 0.8 mm thick.
- this lowering of the temperature of the aqueous bath also influences the cooling transition temperature.
- this transition temperature of cooling is 550 ° C in a water bath at 70 ° C; she can be lowered to around 300 ° C by an appropriate addition of at least one of the the above surfactants.
- At least one added to said aqueous bath an organic acid, chosen from acetic acid, benzoic acid and formic acid.
- This variant is particularly advantageous for the manufacture of steel strips non-oxidized, intended in particular to be galvanized directly.
- the surface-active substances added to the bath aqueous must also resist the aforementioned organic acids.
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 Strip Materials And Filament Materials (AREA)
- Coating With Molten Metal (AREA)
- Control Of Heat Treatment Processes (AREA)
Description
Conformément à l'invention, un procédé de fabrication d'une bande d'acier en continu, dans lequel on plonge la bande d'acier, à une température comprise entre 700°C et 850°C, dans un bain aqueux maintenu à une température supérieure à la température ambiante, est caractérisé en ce que l'on ajoute audit bain aqueux au moins une substance tensio-active capable d'abaisser la tension superficielle dudit bain aqueux d'au moins 20 dynes/cm, en ce que l'on ajoute ladite substance tensio-active en une proportion comprise entre 0,5 g/l et 50 g/l, et en ce que l'on abaisse ainsi la tension superficielle dudit bain aqueux à une valeur inférieure à 30 dynes/cm.
- tristéarate de sorbitan
- trioléate de sorbitan
- isostéarate de sorbitan
- monostéarate de sorbitan
- monolaurate de sorbitan
- monostéarate de pentaérythritol
- monooléate de pentaérythritol
- dioléate de propylène glycol.
Claims (8)
- Procédé de fabrication d'une bande d'acier en continu, dans lequel on plonge la bande d'acier, à une température comprise entre 700°C et 850°C, dans un bain aqueux maintenu à une température supérieure à la température ambiante, caractérisé en ce que l'on ajoute audit bain aqueux au moins une substance tensio-active capable d'abaisser la tension superficielle dudit bain aqueux d'au moins 20 dynes/cm, en ce que l'on ajoute ladite substance tensio-active en une proportion comprise entre 0,5 g/l et 50 g/l, et en ce que l'on abaisse ainsi la tension superficielle dudit bain aqueux à une valeur inférieure à 30 dynes/cm.
- Procédé suivant la revendication 1, caractérisé en ce que l'on utilise des substances tensio-actives capables de résister à des températures supérieures à 110°C.
- Procédé suivant l'une ou l'autre des revendications 1 et 2, caractérisé en ce que l'on utilise des substances tensio-actives capables de résister à des pressions d'au moins 2 bar.
- Procédé suivant l'une ou l'autre des revendications 1 à 3, caractérisé en ce que ledit bain aqueux se trouve sensiblement à sa température d'ébullition.
- Procédé suivant l'une ou l'autre des revendications 1 à 3, caractérisé en ce que ledit bain aqueux se trouve à une température de 50°C à 90°C.
- Procédé suivant la revendication 5, caractérisé en ce que la bande d'acier sort dudit bain aqueux à une température supérieure à sa température de transition du refroidissement et en ce qu'elle est soumise à un refroidissement complémentaire par aspersion avec de l'eau à 50°C-90°C.
- Procédé suivant l'une ou l'autre des revendications 1 à 6, caractérisé en ce que l'on ajoute audit bain aqueux au moins un acide organique, choisi parmi l'acide acétique, l'acide benzoïque et l'acide formique.
- Procédé suivant la revendication 7, caractérisé en ce que lesdites substances tensio-actives sont capables de résister auxdits acides organiques.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE9900492A BE1012789A3 (fr) | 1999-07-19 | 1999-07-19 | Procede de fabrication d'une bande d'acier en continu. |
BE9900492 | 1999-07-19 | ||
PCT/BE2000/000071 WO2001006022A1 (fr) | 1999-07-19 | 2000-06-27 | Procede de fabrication d'une bande d'acier en continu |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1204770A1 EP1204770A1 (fr) | 2002-05-15 |
EP1204770B1 true EP1204770B1 (fr) | 2003-08-27 |
EP1204770B8 EP1204770B8 (fr) | 2004-04-21 |
Family
ID=3892009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00943485A Expired - Lifetime EP1204770B8 (fr) | 1999-07-19 | 2000-06-27 | Procede de fabrication d'une bande d'acier en continu |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1204770B8 (fr) |
AT (1) | ATE248234T1 (fr) |
AU (1) | AU5797800A (fr) |
BE (1) | BE1012789A3 (fr) |
DE (1) | DE60004865T2 (fr) |
ES (1) | ES2204636T3 (fr) |
WO (1) | WO2001006022A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10350832A1 (de) * | 2003-10-28 | 2005-06-09 | Mannesmannröhren-Werke Ag | Verfahren zur Wärmebehandlung metallischer Werkstücke |
US8381329B2 (en) | 2006-10-24 | 2013-02-26 | Bradley Fixtures Corporation | Capacitive sensing for washroom fixture |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR858096A (fr) * | 1938-08-01 | 1940-11-16 | Fruit Growers Exchange Ca | Procédé de trempe de l'acier et des autres alliages |
BE843321A (fr) * | 1976-06-23 | 1976-12-23 | Procede pour le traitement thermique en continu de toles laminees | |
JPS5858233A (ja) * | 1981-09-30 | 1983-04-06 | Nippon Kokan Kk <Nkk> | 有機酸によるストリツプの無酸化焼入方法 |
GB2150159A (en) * | 1983-11-24 | 1985-06-26 | Fire Out Systems Limited | Cooling heated surfaces |
-
1999
- 1999-07-19 BE BE9900492A patent/BE1012789A3/fr not_active IP Right Cessation
-
2000
- 2000-06-27 WO PCT/BE2000/000071 patent/WO2001006022A1/fr active IP Right Grant
- 2000-06-27 DE DE60004865T patent/DE60004865T2/de not_active Expired - Lifetime
- 2000-06-27 EP EP00943485A patent/EP1204770B8/fr not_active Expired - Lifetime
- 2000-06-27 AU AU57978/00A patent/AU5797800A/en not_active Abandoned
- 2000-06-27 AT AT00943485T patent/ATE248234T1/de not_active IP Right Cessation
- 2000-06-27 ES ES00943485T patent/ES2204636T3/es not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2204636T3 (es) | 2004-05-01 |
WO2001006022A1 (fr) | 2001-01-25 |
EP1204770B8 (fr) | 2004-04-21 |
EP1204770A1 (fr) | 2002-05-15 |
AU5797800A (en) | 2001-02-05 |
ATE248234T1 (de) | 2003-09-15 |
DE60004865D1 (de) | 2003-10-02 |
DE60004865T2 (de) | 2004-07-15 |
BE1012789A3 (fr) | 2001-03-06 |
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