CA2153117A1 - Hot immersion coating of steel sheet surfaces - Google Patents
Hot immersion coating of steel sheet surfacesInfo
- Publication number
- CA2153117A1 CA2153117A1 CA002153117A CA2153117A CA2153117A1 CA 2153117 A1 CA2153117 A1 CA 2153117A1 CA 002153117 A CA002153117 A CA 002153117A CA 2153117 A CA2153117 A CA 2153117A CA 2153117 A1 CA2153117 A1 CA 2153117A1
- Authority
- CA
- Canada
- Prior art keywords
- steel sheet
- rollers
- coating
- roller
- nitrogen
- 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.)
- Abandoned
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 14
- 239000011248 coating agent Substances 0.000 title claims abstract description 14
- 238000000576 coating method Methods 0.000 title claims abstract description 14
- 239000010959 steel Substances 0.000 title claims abstract description 14
- 238000007654 immersion Methods 0.000 title claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 238000007790 scraping Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims 3
- 239000011261 inert gas Substances 0.000 abstract description 2
- 230000001939 inductive effect Effects 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021652 non-ferrous alloy Inorganic materials 0.000 description 1
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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0034—Details related to elements immersed in bath
- C23C2/00342—Moving elements, e.g. pumps or mixers
- C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0843—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being backed up by gas jet means for pushing the material in contact with the coating roller
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Coating Apparatus (AREA)
Abstract
A device for coating steel sheet surfaces by hot immer-sion in continuous coating lines, is provided, including several driving rollers inducing against the surface of the sheet to be coated, complemented by tensioning rollers and an inert gas stream, in this case nitrogen, acting on the cutting edges of the scrapers and against the surface of the coating driving rollers.
Description
:-- 2153117 IMPROVEMENTS IN ~IOT IMMERS ION
2 COATING OF STEEL SHEET S~JRFACES
4 The instant invention relates to lmprovements in devices for coating steel sheet surfaces by hot immersion in continu-6 ous coating lines.
7 BAC~CGROUND OF T~ TNVENl~TON - PRIOR ART
8 As known, it is a re~uirement for the continuous coating 9 of a cold rolled steel sheet that a forward roller located towards the vertical line of the steel band be included within 11 the non-ferrous alloy bath. Generally, the roller used is a 1~ single roller having a diameter of about S00 mm or higher, 1. assisted by tensioning rollers of lower diameter in order to 14 maintain ~table the passage o~ the sheet against the members draining the excess of the molten alloy which is entrained 16 from the bath by the steel band. Such a roller has an angle 17 embraced by the -~heet contacting the roller of at least 120 18 which results in a large contact surface between the sheet and 19 the roller. This large contact surface is harmful since it tends to trap molten alloy between the roller and the sheet, 21 which causes sheet deformation since molten metal cannot 22 escape therefrom.
23 In order to solve this disadvantage, immersed rollers 24 adopt different configurations to minimize the mentioned effect. Among the most usual configurations, holes are 26 drilled at the roller surface along with slots in order to 27 facilitate displacement of molten metal towards the holes.
28 Further, the large angle involved by the contact of a portion 29 of the sheet upon ~he roller makes the deformation produced by alloy product accumulation on the roller mor~ notorious, which 31 is minimized by the use of nitrogen fed mechanical scrapers, 32 but the effect of nitrogen-aided scraping is more notorious in 33 the case of tensioning rollers of a lower diameter. This is 34 due to the higher angular speed of the roller, which increases -1 as the roller diameter decreases. The higher angular speed 2 facilitates scraping due to the higher frequency of the 3 passage of each roller generatrix in front of the scraper.
4 Further, a lower embracing angle Qf tensioning rollers disfavors marking of the sheet due to roller deformation.
6 Taking into account the above, the novelty of the present 7 invention resides in multiple forward rollers provided with 8 nitrogen-assisted mechanical ~crapers, thus obtaining, as 9 shown in the case of three rollers shown in figure 1 herein, an improvement in the quality of material produced by this 11 process, since the possibility of deformation produced by a 12 large diameter roller involving a large angle is prevented.
: BRIEF DESCRIPTION OF THE DRAWING
14 Figure 1 is a vertical section of the apparatus of the present invention for hot immersion coating of steel sheet 16 surfaces.
17 DETAILED DESCRIPTION OF THE PREFERRED EM30~IMENT
18 Figure 1 is a vertical section of the assembly showing 19 multiple forward rollers 1, 2 and 3 of equal diameter, which have scraper support boxes 4, 5 and 6 to which scrapers 7, 8 21 and 9, respectively, are linked.
22 Tensioning rollers 10 and 11 mounted on parallel shafts 23 have in front of them scraper support boxes 12 and 13 contain-24 ing scrapers 14 and 15.
2~ Cutting edges are designated with numerals 16, 17, 18, 19 2~ and 20, and correspond to rollers 1, 2, 3, 10 and 11, respec-27 tively.
28 Conduits carrying inert gas, nitrogen in this case, 21, 29 22, 23, 24 and 25, end into the scraper support boxes 4, 5, 6, 14 and 15, respectively.
31 A description of multiple roller arrangement replacing 32 the single roller of larger diameter is shown in figure 1.
33 In contrast, in a conventional arrangement of the single 34 roller with nitrogen assisted scrapers, a sheet is forwarded -1 towards the vertical line by means of a roller having a 2 diameter larger than 400 mm with an angle of the sheet over 3 the roller higher than 120. This causes a large contact 4 surface which is disadvantageous, since in spite of the improvement introduced by the nitrogen-assisted scraping, any 6 deformation of the roller is reproduced on the sheet.
7 Further, scraping on smaller diameter rollers is more effec-8 tive due to the more frequent passage of possible scales on 9 the roller through the scraper.
Due to the above, the novelty of the present invention 11 resides in the use of multiple forward rollers for attaining 12 return of the sheet towards the vertical line with a minimal . embracement angles, by means of the cistribution of the 14 contact angle of a single roller in at least two rollers, which allows smaller contact angles and higher scraping 16 speeds, thus eliminating marks and corrugations on the sheet 17 produced by the aforementioned large surface contact, which 18 contact is prevented by this process.
19 It is further noted that other modifications may be made to the present invention without departing from the scope of 21 the present invention, as noted in the appended claims.
7 BAC~CGROUND OF T~ TNVENl~TON - PRIOR ART
8 As known, it is a re~uirement for the continuous coating 9 of a cold rolled steel sheet that a forward roller located towards the vertical line of the steel band be included within 11 the non-ferrous alloy bath. Generally, the roller used is a 1~ single roller having a diameter of about S00 mm or higher, 1. assisted by tensioning rollers of lower diameter in order to 14 maintain ~table the passage o~ the sheet against the members draining the excess of the molten alloy which is entrained 16 from the bath by the steel band. Such a roller has an angle 17 embraced by the -~heet contacting the roller of at least 120 18 which results in a large contact surface between the sheet and 19 the roller. This large contact surface is harmful since it tends to trap molten alloy between the roller and the sheet, 21 which causes sheet deformation since molten metal cannot 22 escape therefrom.
23 In order to solve this disadvantage, immersed rollers 24 adopt different configurations to minimize the mentioned effect. Among the most usual configurations, holes are 26 drilled at the roller surface along with slots in order to 27 facilitate displacement of molten metal towards the holes.
28 Further, the large angle involved by the contact of a portion 29 of the sheet upon ~he roller makes the deformation produced by alloy product accumulation on the roller mor~ notorious, which 31 is minimized by the use of nitrogen fed mechanical scrapers, 32 but the effect of nitrogen-aided scraping is more notorious in 33 the case of tensioning rollers of a lower diameter. This is 34 due to the higher angular speed of the roller, which increases -1 as the roller diameter decreases. The higher angular speed 2 facilitates scraping due to the higher frequency of the 3 passage of each roller generatrix in front of the scraper.
4 Further, a lower embracing angle Qf tensioning rollers disfavors marking of the sheet due to roller deformation.
6 Taking into account the above, the novelty of the present 7 invention resides in multiple forward rollers provided with 8 nitrogen-assisted mechanical ~crapers, thus obtaining, as 9 shown in the case of three rollers shown in figure 1 herein, an improvement in the quality of material produced by this 11 process, since the possibility of deformation produced by a 12 large diameter roller involving a large angle is prevented.
: BRIEF DESCRIPTION OF THE DRAWING
14 Figure 1 is a vertical section of the apparatus of the present invention for hot immersion coating of steel sheet 16 surfaces.
17 DETAILED DESCRIPTION OF THE PREFERRED EM30~IMENT
18 Figure 1 is a vertical section of the assembly showing 19 multiple forward rollers 1, 2 and 3 of equal diameter, which have scraper support boxes 4, 5 and 6 to which scrapers 7, 8 21 and 9, respectively, are linked.
22 Tensioning rollers 10 and 11 mounted on parallel shafts 23 have in front of them scraper support boxes 12 and 13 contain-24 ing scrapers 14 and 15.
2~ Cutting edges are designated with numerals 16, 17, 18, 19 2~ and 20, and correspond to rollers 1, 2, 3, 10 and 11, respec-27 tively.
28 Conduits carrying inert gas, nitrogen in this case, 21, 29 22, 23, 24 and 25, end into the scraper support boxes 4, 5, 6, 14 and 15, respectively.
31 A description of multiple roller arrangement replacing 32 the single roller of larger diameter is shown in figure 1.
33 In contrast, in a conventional arrangement of the single 34 roller with nitrogen assisted scrapers, a sheet is forwarded -1 towards the vertical line by means of a roller having a 2 diameter larger than 400 mm with an angle of the sheet over 3 the roller higher than 120. This causes a large contact 4 surface which is disadvantageous, since in spite of the improvement introduced by the nitrogen-assisted scraping, any 6 deformation of the roller is reproduced on the sheet.
7 Further, scraping on smaller diameter rollers is more effec-8 tive due to the more frequent passage of possible scales on 9 the roller through the scraper.
Due to the above, the novelty of the present invention 11 resides in the use of multiple forward rollers for attaining 12 return of the sheet towards the vertical line with a minimal . embracement angles, by means of the cistribution of the 14 contact angle of a single roller in at least two rollers, which allows smaller contact angles and higher scraping 16 speeds, thus eliminating marks and corrugations on the sheet 17 produced by the aforementioned large surface contact, which 18 contact is prevented by this process.
19 It is further noted that other modifications may be made to the present invention without departing from the scope of 21 the present invention, as noted in the appended claims.
Claims (4)
1. An improved device for coating steel sheet surfaces by hot immersion in continuous coating lines, wherein a steel sheet is advanced over a roller during coating, said device comprising a plurality of rollers contacting said steel sheet, during advancement of said steel sheet past said plurality of rollers, said device further comprising a plurality of nitrogen-assisted mechanical scrapers feeding nitrogen towards said plurality of rollers.
2. The improved device, as claimed in claim 1, wherein said plurality of rollers comprises three rollers, each said roller having a respective mechanical scraping means, and a source of feeding of nitrogen gas thereto.
3. A process for hot treatment and immersion of steel sheet as claimed in Claim 1, wherein said steel sheet is carried by said plurality of rollers to be forwarded towards a pre-determined vertical line with the simultaneous action of scrapers and the provision of nitrogen gas, and at least two further tensioning rollers provided therewith.
4. A process for coating steel sheet surfaces compris-ing passing a steel sheet during coating against a plurality of rollers, and feeding a source of nitrogen gas thereat.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AR329.258 | 1994-08-30 | ||
| AR32925894 | 1994-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2153117A1 true CA2153117A1 (en) | 1996-03-01 |
Family
ID=3478916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002153117A Abandoned CA2153117A1 (en) | 1994-08-30 | 1995-06-30 | Hot immersion coating of steel sheet surfaces |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH08170158A (en) |
| KR (1) | KR960007805A (en) |
| CA (1) | CA2153117A1 (en) |
| DE (1) | DE19517256C2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4441243A1 (en) * | 1994-11-19 | 1996-05-23 | Comesi S A I C | Appts for hot-dip metallisation of steel strip |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1272678B (en) * | 1962-08-23 | 1968-07-11 | Armco Steel Corp | Device for regulating the coating thickness during the continuous coating of wire and strip material with molten metal |
| DE2610632C2 (en) * | 1976-03-13 | 1978-04-13 | Wilhelm 4156 Willich Mueschen | Use of a wedge or curve shaped wiper in zinc, lead, tin or aluminum melt baths |
-
1995
- 1995-05-11 DE DE19517256A patent/DE19517256C2/en not_active Expired - Fee Related
- 1995-06-30 CA CA002153117A patent/CA2153117A1/en not_active Abandoned
- 1995-08-17 KR KR1019950025216A patent/KR960007805A/en not_active Application Discontinuation
- 1995-08-29 JP JP7243566A patent/JPH08170158A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE19517256C2 (en) | 1998-03-19 |
| KR960007805A (en) | 1996-03-22 |
| DE19517256A1 (en) | 1996-03-07 |
| JPH08170158A (en) | 1996-07-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |