EP0225273B1 - Continuous picklung method and apparatus - Google Patents
Continuous picklung method and apparatus Download PDFInfo
- Publication number
- EP0225273B1 EP0225273B1 EP86730180A EP86730180A EP0225273B1 EP 0225273 B1 EP0225273 B1 EP 0225273B1 EP 86730180 A EP86730180 A EP 86730180A EP 86730180 A EP86730180 A EP 86730180A EP 0225273 B1 EP0225273 B1 EP 0225273B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pickling
- acid liquid
- tank
- pickled
- acid
- 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
Images
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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/023—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by spraying
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
- C23G3/028—Associated apparatus, e.g. for pretreating or after-treating for thermal or mechanical pretreatment
Definitions
- the present invention relates to a continious pickling method and apparatus for metallic materials and especially for steel plates.
- FIG. 10 One embodiment of a conventional continuous pickling apparatus is shown in Fig. 10.
- reference numeral 101 is a steel strip
- numeral 102 is an acid tank
- 103 is an acid liquid
- 104a, 104b, 104c, 104d and 104e are guide rolls.
- the steel strip 101 having ordinary temperature is unwound from a payoff reel not shown, and is then caused to run through the acid liquid 103 in the acid tank 102, while a scale formed on the surfaces of the steel strip 4 is pickled out with the acid liquid 103. Afterward, the scale-free steel strip 101 is taken out from the acid tank 102 and is then fed to a subsequent process not shown.
- An object of the present invention is to provide a continuous pickling method and apparatus by which a period of time necessary for a pickling operation is curtailed, so that a used acid tank is shortened.
- a first means for achieving the above object is to heat a material to be pickled up to a high temperature. That is, the present invention is directed to a continuous pickling method for continuously pickling a metallic material to be pickled, the method being characterized by heating the material up to a temperature higher than a boiling point of an acid liquid under atmospheric pressure and then pickling the material with said acid liquid of a temperature lower than that of said material to be pickled in said pickling tank.
- a heating device for heating a steel strip which is a material to be pickled is provided in front of an acid tank, and in the heating device, the steel strip is then heated up to a temperature higher than a boiling point of an acid liquid under atmospheric pressure. Afterward, the steel strip is introduced into the acid tank in order to be subjected to a pickling treatment.
- the steel strip having a temperature higher than the boiling point of the acid liquid is brought into contact with the acid liquid having a temperature lower than the boiling point.
- the acid liquid penetrates into fine cracks in a scale on the surfaces of the steel strip, and it boils to generate vapor.
- a gas is expanded abruptly, so that pieces of the scale are peeled off and new cracks occurs. In this way, the pickling time is curtailed.
- a second means for achieving the above object is to jet an acid liquid against a previously highly heated material to be pickled. That is, the present invention is directed to a continuous pickling method for continuously pickling a material to be pickled, the method being characterized by heating the material up to a temperature higher than a boiling point of an acid liquid under atmospheric pressure, and then jetting the acid liquid againt the material in an acid tank in order to pickle the material, without immersing the material into the acid liquid.
- a heating device for heating the steel strip is provided in front of the acid tank, and the steel strip is heated up to a temperature higher than the boiling point of the acid liquid under atmospheric pressure by the heating device. Afterward, the steel strip is introduced into the acid tank, and the acid liquid is jetted against the steel strip material to pickle the latter, without immersing the steel strip material into the acid liquid.
- the steel strip having a temperature higher than the boiling point of the acid liquid is brought into contact with the acid liquid having a temperature lower than the boiling point.
- the acid liquid penetrates into fine cracks in a scale on the surfaces of the steel strip, and it boils to generate vapor.
- a gas is expanded abruptly, so that pieces of the scale are peeled off and new cracks occurs.
- the jetted acid liquid washes out the pieces of the scale, or the reacted acid liquid is replaced with the new acid liquid to accelerate the reaction, whereby the time necessary for the pickling treatment is curtailed.
- the jet method of the present invention has a greater jet effect because of the vigor of the jet being maintained, and an advantage of decreasing a necessary amount of the acid liquid owing to immersing no steel strip into the acid liquid.
- the present invention provides an apparatus for practicing the above mentioned method.
- the present invention is directed to the use of a pretreating apparatus for continuous pickling which comprises a tank for receiving herein hot water having a temperature higher than its boiling point under atmospheric pressure, a heating device for heating the hot water, and seal rolls disposed at an outlet and an inlet of the tank and a material to be pickled.
- This apparatus can practice the above mentioned method effectively.
- a heating device is provided in front of an acid tank, and reference numeral 1 is a steel strip, numeral 2 is an acid tank, 3 is an acid liquid, 4a, 4b, 4c, 4d and 4e are guide rolls, and 6a and 6b are electric type, hot air type or other type heating devices.
- the steel strip 1 is heated up to a temperature higher than a boiling point of the acid liquid at atmospheric pressure by the heating devices 6a, 6b, and it is then immersed into the acid liquid 3 in the acid tank 2 to pickle the steel strip 1.
- Fig. 2 exhibits the other embodiment in which a heating water tank 7 is equipped as the heating device.
- the heating water tank 7 in Fig. 2 is of a sealing type, and pairs of seal rolls 9a, 9b and 9c, 9d are disposed at an outlet and an inlet, respectively, of the steel strip 1 in the heating water tank 7, whereby an opening space between the interior of the heating water tank 7 and the outside is minimized, and the steel strip 1 is allowed to run continuously through the heating tank 7, while a high pressure is retained in the tank 7.
- a pressurizing water 8 having a high temperature is placed in the heating water tank 7.
- Numerals 10a, 10b and 10c are guide rolls.
- the pressurizing water 8 is heated by, for example, a disposed heating device 41 so as to provide the water 8 with a high temperature.
- Fig. 3 shows the other embodiment.
- the heating devices 6a and 6b are disposed in front of the acid tank as in the case of Fig. 1, but the acid tank 12 is pressurer-sealed by the seal rolls 5a, 5b and 5c, 5d in order to maintain the interior of the acid tank 12 at a high pressure and to maintain the acid liquid 3 at a temperature higher than its boiling point at atmospheric pressure.
- the steel strip at the outlet of the heating device 6a, 6b has a higher temperature than the acid liquid 3.
- 14a, 14b and 14c are guide rolls.
- Fig. 4 is the further other embodiment of the present invention.
- the apparatus in Fig. 4 is equipped with the same acid tank 12 as in Fig. 3, but the same heating water tank 7 as in Fig. 2 is provided as the heating device in front of the acid tank. That is, numeral 8 is a pressurizing water having a high temperature, 9a, 9b, 9c and 9d are seal rolls, and 10a, 10b and 10c are guide rolls.
- the steel strip is first heated up to a temperature higher than the boiling point of the acid liquid at atmospheric pressure and is then immersed into the acid liquid. Therefore, at the moment when the steel strip is immersed into the acid liquid, the latter penetrates into fine cracks in a scale on the surfaces of the steel strip, and it boils to generage vapor, which fact leads to the abrupt expansion of a gas. As a result, pieces of the scale are peeled off and new cracks occur, so that a time necessary for the pickling operation is curtailed. According to experiments made by the inventors of the present application, the higher the temperature of the steel plate is, the shorter the time necessary for the pickling operation is, as shown in Fig. 5.
- the pickling time necessary for the steel plate of 80 °C is regarded as 100 %
- the pickling time for the steel plate of 200 °C is 50 % or less.
- the similar effect can be obtained by heating the steel plate up to a level higher than the liquid temperature.
- a heating device is provided in front of an acid tank, and reference numeral 1 is a steel strip, numeral 22 is an acid tank, 3 is an acid liquid, 24a, 24b, 24c and 24d are guide rolls.
- Numerals 6a and 6b are electric type, hot air type or other type heating devices, as shown in Fig. 3.
- the steel strip 1 is heated up to a temperature higher than a boiling point of the acid liquid at atmospheric pressure by the heating devices 6a, 6b, and is then introduced into the acid tank 22.
- the steel strip 1 is subjected to a pickling treatment by jetting the acid liquid, fed by a pump not shown, against both the surfaces of the steel strip 1 through nozzles 11 a, 11 b, 11 c, « and 111, while supported by the guide rolls 24a, 24b, 24c and 24d, without being immersed into the acid liquid 3.
- Fig. 7 shows the other embodiment of the present invention, and in this embodiment, the same heating water tank 7 as in Fig. 4 is equipped.
- Figs. 8 and 9 show other embodiments of an acid tank portion regarding the present invention:
- the embodiment in Fig. 8 has shield plates 12a, 12b, 12c, whil and 121 which closely confront the upper and lower surfaces of the steel strip 1 so as to define. a flow path for the acid liquid between these shield plates and the steel strip 1.
- the acid liquid jetted through nozzles 11 a, 11 b, 11 c, « and 111 flows through the aforesaid flow path, so that a contact time between the acid liquid and the steel strip 1 is prolonged, and a velocity of the acid liquid along the steel strip 1 is kept up, thereby assuring an effective pickling reaction.
- the embodiment in Fig. 9 has box shields 13a, 13b, ... which are shaped so as to surround the steel strip 1, and in this case, a flow path is defined between the box shields and the steel strip 1.
- the acid liquid does not flow out in a cross direction of the steel strip, so that an effect of the acid liquid increases additionally.
- the material to be pickled after heated up to a high temperature, is pickled, as described in detail above. Therefore, at the moment when the steel strip is immersed into the acid liquid, the latter penetrates into fine cracks in a scale on the surface of the steel strip, and it boils to generage vapor, which fact leads to the abrupt expansion of a gas. As a result, pieces of the scale are peeled off -and new cracks occur, so that a time necessary for the pickling operation can be curtailed. Further, in consequence, the acid tank car be shortened. This is an effect of the present invention.
- the steel strip is heated as described above, and the acid liquid is then jetted against the heated steel strip, instead of being immersed into the acid liquid. Therefore, at the moment when the acid liquid is jetted against the steel strip, the acid liquid penetrates into fine cracks in a scale on the surface of the steel strip, and it boils to generage vapor, which fact leads to the abrupt expansion of a gas. As a result, pieces of the scale are peeled off and new cracks occur, and the jet of the acid liquid washes out the peices of the scale, so that a time necessary for the pickling operation is curtailed. According to experiments made by the present inventors, the time necessary for the pickling treatment in the present invention is about 1/3 of that of the conventional pickling treatment in which neither heating nor jetting are carried out.
- the material to be pickled for example, the steel strip can be heated up to the temperature higher than the boiling point of the acid liquid at atmospheric pressure. Therefore, the method of the present invention can surely be practiced as described above, thereby curtailing the pickling time and shortening the acid tank.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
- The present invention relates to a continious pickling method and apparatus for metallic materials and especially for steel plates.
- General informations about pickling solutions, acid concentrations as well as operating temperatures are known from « Metals Handbook (Ninth Edition, Vol. 5, p. 73-75).
- One embodiment of a conventional continuous pickling apparatus is shown in Fig. 10. In this drawing,
reference numeral 101 is a steel strip,numeral 102 is an acid tank, 103 is an acid liquid, and 104a, 104b, 104c, 104d and 104e are guide rolls. - The
steel strip 101 having ordinary temperature is unwound from a payoff reel not shown, and is then caused to run through theacid liquid 103 in theacid tank 102, while a scale formed on the surfaces of the steel strip 4 is pickled out with theacid liquid 103. Afterward, the scale-free steel strip 101 is taken out from theacid tank 102 and is then fed to a subsequent process not shown. - In the continuous pickling apparatus, it is necessary that the steel strip surfaces are in contact with the acid liquid for a certain period of time, and for the sake of this requirement, when the running speed of the steel strip therethrough is high, the elongated acid tank is correspondingly needful.
- In recent years, however, it is strongly desired to shorten the acid tank from the viewpoints of equipment cost, installation space and the like. As means for shortening this acid tank, there are a manner of causing the steel strip to pass through a mechanical scale breaker prior to immersing it into the acid tank, in order to form fine cracks in the scale on the surfaces of the steel strip and to thereby accelerate the removal - of the scale, and a manner of jetting the acid liquid against the steel strip in the acid tank so as to shorten a reaction time, and these manners can obtain expected results. Nevertheless, with regard to the acid tank, a length of no less than 50 to 100 m is required, and in the case of such a long acid tank, the high equipment cost and the extensive installation space are necessary. For this reason, it is strongly needed to shorten the acid tank.
- An object of the present invention is to provide a continuous pickling method and apparatus by which a period of time necessary for a pickling operation is curtailed, so that a used acid tank is shortened.
- In the present invention, a first means for achieving the above object is to heat a material to be pickled up to a high temperature. That is, the present invention is directed to a continuous pickling method for continuously pickling a metallic material to be pickled, the method being characterized by heating the material up to a temperature higher than a boiling point of an acid liquid under atmospheric pressure and then pickling the material with said acid liquid of a temperature lower than that of said material to be pickled in said pickling tank.
- Now, the present invention will be described in detail. In the present invention, a heating device for heating a steel strip which is a material to be pickled is provided in front of an acid tank, and in the heating device, the steel strip is then heated up to a temperature higher than a boiling point of an acid liquid under atmospheric pressure. Afterward, the steel strip is introduced into the acid tank in order to be subjected to a pickling treatment.
- According to the present invention, at the moment when the steel strip is immersed into the acid liquid, the steel strip having a temperature higher than the boiling point of the acid liquid is brought into contact with the acid liquid having a temperature lower than the boiling point. At this time, the acid liquid penetrates into fine cracks in a scale on the surfaces of the steel strip, and it boils to generate vapor. As a result, a gas is expanded abruptly, so that pieces of the scale are peeled off and new cracks occurs. In this way, the pickling time is curtailed.
- Further, a second means for achieving the above object is to jet an acid liquid against a previously highly heated material to be pickled. That is, the present invention is directed to a continuous pickling method for continuously pickling a material to be pickled, the method being characterized by heating the material up to a temperature higher than a boiling point of an acid liquid under atmospheric pressure, and then jetting the acid liquid againt the material in an acid tank in order to pickle the material, without immersing the material into the acid liquid.
- Now, the present invention will be described in detail. In the present invention, a heating device for heating the steel strip is provided in front of the acid tank, and the steel strip is heated up to a temperature higher than the boiling point of the acid liquid under atmospheric pressure by the heating device. Afterward, the steel strip is introduced into the acid tank, and the acid liquid is jetted against the steel strip material to pickle the latter, without immersing the steel strip material into the acid liquid.
- According to the present invention, at the moment when the acid liquid is jetted against the steel strip, the steel strip having a temperature higher than the boiling point of the acid liquid is brought into contact with the acid liquid having a temperature lower than the boiling point. At this time, the acid liquid penetrates into fine cracks in a scale on the surfaces of the steel strip, and it boils to generate vapor. As a result, a gas is expanded abruptly, so that pieces of the scale are peeled off and new cracks occurs. In addition, the jetted acid liquid washes out the pieces of the scale, or the reacted acid liquid is replaced with the new acid liquid to accelerate the reaction, whereby the time necessary for the pickling treatment is curtailed.
- As compared with a conventional jet manner in the acid liquid, the jet method of the present invention has a greater jet effect because of the vigor of the jet being maintained, and an advantage of decreasing a necessary amount of the acid liquid owing to immersing no steel strip into the acid liquid.
- Moreover, the present invention provides an apparatus for practicing the above mentioned method.
- That is, the present invention is directed to the use of a pretreating apparatus for continuous pickling which comprises a tank for receiving herein hot water having a temperature higher than its boiling point under atmospheric pressure, a heating device for heating the hot water, and seal rolls disposed at an outlet and an inlet of the tank and a material to be pickled.
- This apparatus can practice the above mentioned method effectively.
- The object, characteristics and benefits of the present invention will be more clarified by the undermentioned description in reference to the accompanying drawings.
-
- Figs. 1 to 4 show schematic sectional view of embodiments of an apparatus suitable for a pickling method with regard to the present invention, and of these drawings, Fig. 1 shows the apparatus in which a heating device is provided in front of an acid tank, Fig. 2 shows the apparatus in which a heating water tank is provided as a heating device, Fig. 3 shows the same apparatus as in Fig. 1 with the exception that a high pressure is retained in the acid tank, and Fig. 4 shows the apparatus in which the heating water tank is used and the high pressure is retained in the acid tank;
- Fig. 5 shows a relation between a temperature of a steel plate and a ratio of a pickling time ;
- Figs. 6 to 9 show schematic sectional view of other embodiments of the apparatus suitable for the pickling method with regard to the present invention, and of these drawings, Fig. 6 shows the apparatus in which the heating device is provided in front of the acid tank, Fig. 7 shows the apparatus in which the heating water tank is provided as the heating device, Fig. 8 shows the apparatus having the acid tank portion in which shield plates are disposed confronting the upper and the lower surfaces of the steel strip, and Fig. 9 shows the apparatus having acid tank portions of box shield structures which are constituted so as to surround the steel strip ; and
- Fig. 10 is a schematic sectional view of a conventional pickling apparatus.
- In the first place, embodiments of the present invention for practicing the above mentioned first means are shown in Figs. 1, 2, 3 and 4. In the embodiment in Fig. 1, a heating device is provided in front of an acid tank, and
reference numeral 1 is a steel strip,numeral 2 is an acid tank, 3 is an acid liquid, 4a, 4b, 4c, 4d and 4e are guide rolls, and 6a and 6b are electric type, hot air type or other type heating devices. Thesteel strip 1 is heated up to a temperature higher than a boiling point of the acid liquid at atmospheric pressure by theheating devices 6a, 6b, and it is then immersed into theacid liquid 3 in theacid tank 2 to pickle thesteel strip 1. - Fig. 2 exhibits the other embodiment in which a
heating water tank 7 is equipped as the heating device. Theheating water tank 7 in Fig. 2 is of a sealing type, and pairs ofseal rolls steel strip 1 in theheating water tank 7, whereby an opening space between the interior of theheating water tank 7 and the outside is minimized, and thesteel strip 1 is allowed to run continuously through theheating tank 7, while a high pressure is retained in thetank 7. A pressurizingwater 8 having a high temperature is placed in theheating water tank 7.Numerals - Incidentally, the pressurizing
water 8 is heated by, for example, a disposedheating device 41 so as to provide thewater 8 with a high temperature. - Fig. 3 shows the other embodiment. In this embodiment, the
heating devices 6a and 6b are disposed in front of the acid tank as in the case of Fig. 1, but theacid tank 12 is pressurer-sealed by theseal rolls acid tank 12 at a high pressure and to maintain theacid liquid 3 at a temperature higher than its boiling point at atmospheric pressure. In this embodiment, the steel strip at the outlet of theheating device 6a, 6b has a higher temperature than theacid liquid 3. In Fig. 3, 14a, 14b and 14c are guide rolls. - Fig. 4 is the further other embodiment of the present invention. The apparatus in Fig. 4 is equipped with the
same acid tank 12 as in Fig. 3, but the sameheating water tank 7 as in Fig. 2 is provided as the heating device in front of the acid tank. That is,numeral 8 is a pressurizing water having a high temperature, 9a, 9b, 9c and 9d are seal rolls, and 10a, 10b and 10c are guide rolls. - According to the pickling means of each embodiment just described, the steel strip is first heated up to a temperature higher than the boiling point of the acid liquid at atmospheric pressure and is then immersed into the acid liquid. Therefore, at the moment when the steel strip is immersed into the acid liquid, the latter penetrates into fine cracks in a scale on the surfaces of the steel strip, and it boils to generage vapor, which fact leads to the abrupt expansion of a gas. As a result, pieces of the scale are peeled off and new cracks occur, so that a time necessary for the pickling operation is curtailed. According to experiments made by the inventors of the present application, the higher the temperature of the steel plate is, the shorter the time necessary for the pickling operation is, as shown in Fig. 5. For example, when the pickling time necessary for the steel plate of 80 °C is regarded as 100 %, the pickling time for the steel plate of 200 °C is 50 % or less. In the case that a temperature of the acid liquid in the acid tank is higher than the boiling point thereof at atmospheric pressure, the similar effect can be obtained by heating the steel plate up to a level higher than the liquid temperature.
- Embodiments of the present invention which can practice the above mentioned second means are shown in Figs. 6 and 7. In the embodiment in Fig. 6, a heating device is provided in front of an acid tank, and
reference numeral 1 is a steel strip,numeral 22 is an acid tank, 3 is an acid liquid, 24a, 24b, 24c and 24d are guide rolls.Numerals 6a and 6b are electric type, hot air type or other type heating devices, as shown in Fig. 3. Thesteel strip 1 is heated up to a temperature higher than a boiling point of the acid liquid at atmospheric pressure by theheating devices 6a, 6b, and is then introduced into theacid tank 22. Afterward, thesteel strip 1 is subjected to a pickling treatment by jetting the acid liquid, fed by a pump not shown, against both the surfaces of thesteel strip 1 through nozzles 11 a, 11 b, 11 c, ...... and 111, while supported by theguide rolls acid liquid 3. - Fig. 7 shows the other embodiment of the present invention, and in this embodiment, the same
heating water tank 7 as in Fig. 4 is equipped. - Figs. 8 and 9 show other embodiments of an acid tank portion regarding the present invention: The embodiment in Fig. 8 has
shield plates 12a, 12b, 12c, ...... and 121 which closely confront the upper and lower surfaces of thesteel strip 1 so as to define. a flow path for the acid liquid between these shield plates and thesteel strip 1. In this construction, the acid liquid jetted through nozzles 11 a, 11 b, 11 c, ...... and 111 flows through the aforesaid flow path, so that a contact time between the acid liquid and thesteel strip 1 is prolonged, and a velocity of the acid liquid along thesteel strip 1 is kept up, thereby assuring an effective pickling reaction. - The embodiment in Fig. 9 has
box shields steel strip 1, and in this case, a flow path is defined between the box shields and thesteel strip 1. As compared with the embodiment in Fig. 8, the acid liquid does not flow out in a cross direction of the steel strip, so that an effect of the acid liquid increases additionally. - In the present invention, the material to be pickled, after heated up to a high temperature, is pickled, as described in detail above. Therefore, at the moment when the steel strip is immersed into the acid liquid, the latter penetrates into fine cracks in a scale on the surface of the steel strip, and it boils to generage vapor, which fact leads to the abrupt expansion of a gas. As a result, pieces of the scale are peeled off -and new cracks occur, so that a time necessary for the pickling operation can be curtailed. Further, in consequence, the acid tank car be shortened. This is an effect of the present invention.
- In addition, according to the present invention, the steel strip is heated as described above, and the acid liquid is then jetted against the heated steel strip, instead of being immersed into the acid liquid. Therefore, at the moment when the acid liquid is jetted against the steel strip, the acid liquid penetrates into fine cracks in a scale on the surface of the steel strip, and it boils to generage vapor, which fact leads to the abrupt expansion of a gas. As a result, pieces of the scale are peeled off and new cracks occur, and the jet of the acid liquid washes out the peices of the scale, so that a time necessary for the pickling operation is curtailed. According to experiments made by the present inventors, the time necessary for the pickling treatment in the present invention is about 1/3 of that of the conventional pickling treatment in which neither heating nor jetting are carried out.
- Furthermore, according to the pickling pretreating apparatus, the material to be pickled, for example, the steel strip can be heated up to the temperature higher than the boiling point of the acid liquid at atmospheric pressure. Therefore, the method of the present invention can surely be practiced as described above, thereby curtailing the pickling time and shortening the acid tank.
Claims (7)
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP273431/85 | 1985-12-06 | ||
JP27343185A JPS62133090A (en) | 1985-12-06 | 1985-12-06 | Continuous pretreatment device for pickling |
JP27506785A JPS62136581A (en) | 1985-12-09 | 1985-12-09 | Continuous pickling method |
JP275067/85 | 1985-12-09 | ||
JP275068/85 | 1985-12-09 | ||
JP27506885A JPS62136582A (en) | 1985-12-09 | 1985-12-09 | Continuous pickling method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0225273A1 EP0225273A1 (en) | 1987-06-10 |
EP0225273B1 true EP0225273B1 (en) | 1990-03-28 |
Family
ID=27336094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86730180A Expired - Lifetime EP0225273B1 (en) | 1985-12-06 | 1986-11-03 | Continuous picklung method and apparatus |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0225273B1 (en) |
KR (1) | KR870006236A (en) |
AU (1) | AU594988B2 (en) |
BR (1) | BR8605681A (en) |
DE (1) | DE3669898D1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62136583A (en) * | 1985-12-09 | 1987-06-19 | Mitsubishi Heavy Ind Ltd | Continuous pickling device |
US5466309A (en) * | 1993-02-12 | 1995-11-14 | Clecim | Metal strip treatment installation |
FR2701410B1 (en) * | 1993-02-12 | 1995-05-05 | Clecim Sa | Stripping installation of a metal strip. |
FR2701493B1 (en) * | 1993-02-12 | 1995-08-25 | Clecim Sa | Stripping installation of a metal strip. |
KR100396062B1 (en) * | 2000-07-13 | 2003-08-27 | 연합철강공업 주식회사 | Method for removal of scale from steel plate |
AT500729B8 (en) * | 2004-12-14 | 2007-02-15 | Voest Alpine Ind Anlagen | BITING DEVICE AND METHOD FOR CONTINUOUSLY POLISHING A METAL BAND |
CN102644087B (en) * | 2012-04-17 | 2014-04-16 | 安徽鑫科新材料股份有限公司 | Soap tank for on-line pickling of finished flat wire and pickling method using soap tank |
CN105483741A (en) * | 2015-12-08 | 2016-04-13 | 无锡华工薄板有限公司 | Temperature control device for acid pickling tank for strip steels |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU43470A1 (en) * | 1962-04-06 | 1963-06-04 | ||
AU1112266A (en) * | 1966-09-15 | 1968-03-21 | Albert Paul Schmidsrauter | Process and apparatus forde-scaling metal articles |
JPS5334167B1 (en) * | 1968-08-17 | 1978-09-19 | ||
US3617039A (en) * | 1968-04-26 | 1971-11-02 | Mitsubishi Heavy Ind Ltd | Descaling apparatus for steel |
JPS62136583A (en) * | 1985-12-09 | 1987-06-19 | Mitsubishi Heavy Ind Ltd | Continuous pickling device |
-
1986
- 1986-11-03 EP EP86730180A patent/EP0225273B1/en not_active Expired - Lifetime
- 1986-11-03 DE DE8686730180T patent/DE3669898D1/en not_active Expired - Lifetime
- 1986-11-17 BR BR8605681A patent/BR8605681A/en not_active IP Right Cessation
- 1986-11-18 AU AU65501/86A patent/AU594988B2/en not_active Ceased
- 1986-11-28 KR KR860010118A patent/KR870006236A/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
BR8605681A (en) | 1987-08-18 |
EP0225273A1 (en) | 1987-06-10 |
AU6550186A (en) | 1987-06-11 |
DE3669898D1 (en) | 1990-05-03 |
AU594988B2 (en) | 1990-03-22 |
KR870006236A (en) | 1987-07-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11193181B2 (en) | Method and apparatus for continuous thermal treatment of a steel strip | |
EP0225273B1 (en) | Continuous picklung method and apparatus | |
CN110546283A (en) | Method and device for cooling a steel strip travelling in a cooling section of a continuous production line | |
US3126301A (en) | Molten salt spray process for descaling stainless steel | |
US3262822A (en) | Method for continuous quenching of aluminum strip | |
KR0148494B1 (en) | Method and apparatus for hot-dipping steel strip | |
GB796242A (en) | Coating of strand-like metal bodies with molten metal | |
EP0225841A1 (en) | Continuous pickling apparatus | |
JPS62136581A (en) | Continuous pickling method | |
US3467549A (en) | Descaling of alloys by high temperature surface vaporization | |
JPS62136582A (en) | Continuous pickling method | |
US3484288A (en) | Process for continuously pickling metallic strip material | |
JPH03277726A (en) | Continuous salt bath tank for steel strip | |
US3145119A (en) | Float casting | |
JPS63192882A (en) | Continuous pickling method | |
JPS5638481A (en) | Pickling method of metal strip | |
JP2968358B2 (en) | Fast descaling method for steel strip | |
JP2960195B2 (en) | Descaling control method for steel strip | |
GB1565874A (en) | Manufacture of galvanized steel sheets | |
US5843367A (en) | Device for the accelerated cooling of a continuous substrate moving rapidly in a vertical plane | |
US3544368A (en) | Process and the descaling of metals | |
JPS62133090A (en) | Continuous pretreatment device for pickling | |
JPH06128774A (en) | Pickling device and pickling treatment method | |
JPS62222089A (en) | Continuous pickling method | |
JP2966622B2 (en) | Pickling pretreatment equipment |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB |
|
17P | Request for examination filed |
Effective date: 19870610 |
|
17Q | First examination report despatched |
Effective date: 19880812 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB |
|
ET | Fr: translation filed | ||
REF | Corresponds to: |
Ref document number: 3669898 Country of ref document: DE Date of ref document: 19900503 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19931027 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19941103 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19941109 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19941110 Year of fee payment: 9 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19941103 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19960731 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19960801 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |