EP0056922B1 - Procédé de fabrication de tôles plombées asymétriques - Google Patents
Procédé de fabrication de tôles plombées asymétriques Download PDFInfo
- Publication number
- EP0056922B1 EP0056922B1 EP19810402066 EP81402066A EP0056922B1 EP 0056922 B1 EP0056922 B1 EP 0056922B1 EP 19810402066 EP19810402066 EP 19810402066 EP 81402066 A EP81402066 A EP 81402066A EP 0056922 B1 EP0056922 B1 EP 0056922B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- lead
- sheet
- process according
- roughness
- 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
Links
- 238000000034 method Methods 0.000 title claims description 22
- 238000000576 coating method Methods 0.000 claims description 33
- 239000011248 coating agent Substances 0.000 claims description 32
- 235000019592 roughness Nutrition 0.000 claims description 21
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 238000007598 dipping method Methods 0.000 claims description 4
- 229910020220 Pb—Sn Inorganic materials 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 2
- 238000000151 deposition Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000007789 sealing Methods 0.000 description 6
- 239000010425 asbestos Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 229910052895 riebeckite Inorganic materials 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000978 Pb alloy Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910000648 terne Inorganic materials 0.000 description 1
- 238000003466 welding Methods 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
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/10—Lead or alloys based thereon
Definitions
- the present invention relates to a method for manufacturing lead-coated steel sheets which are coated asymmetrically.
- Terne coat mild steel sheets called leaded or also called "Terne coat” according to English terminology, that is to say having received on each of their two faces a coating based on lead.
- This coating can be obtained discontinuously on precut sheets, or more generally, by a continuous operation from sheets in coils.
- the sheet or coil is brought to a temperature sufficient to burn the residual oil deposits, then is pickled and finally immersed in a bath of molten lead-tin alloy, generally containing from to 15% of tin.
- the thickness of the deposited lead-based alloy is then adjusted by asbestos wiping rollers or by a jet finishing system such as pressurized nitrogen jets, at the outlet of the metal bath.
- the sheet thus carries on its two faces a coating of uniform thickness of lead alloy which is generally at least 40 g per m 2 on each side.
- the mechanical characteristics of the sheet thus coated closely correspond to those of mild steel sheet.
- the qualities of the lead sheets obtained depend on the one hand on the basic mild steel sheet and on the other hand, on the lead coating then applied.
- the manufacture of mild steel lead-dip sheets is carried out by using two successive techniques relating, on the one hand, to the base sheet and, on the other hand, to the coating of lead, that is to say -first of all to say manufacture of mild steel sheets having suitable mechanical properties and roughness according to conventional operating methods of mild steel, comprising in particular a cold rolling of coils previously hot rolled and pickled, an annealing of continuous or closed recrystallization, a rolling with a very small section reduction carried out on a train called "Skin Pass" which aims, on the one hand to eliminate the elastic limit plateau and on the other hand, to give the surface of the sheet the desired state of roughness, the mild steel sheet thus obtained is then treated on a particular line of actual dip sealing.
- German Patent No. 472,858 A process for manufacturing lead-coated sheets coated with a different thickness of lead on each side is described in German Patent No. 472,858. This process consists in passing, in a substantially horizontal position, the strip of sheet between a scraper located under the lower face and a gas jet device placed above the upper face. However, this device does not allow the desired uniformity of the asymmetric lead coating to be satisfied.
- the present invention aims to remedy these drawbacks by providing a sheet carrying on its two faces an asymmetrical coating of lead which has on the thick coated face all the qualities specific to this type of coating, while it retains on the face to thin coating with sufficient qualities of suitability for welding and painting and weather resistance, the sheet thus obtained allowing lead savings, therefore lower manufacturing costs.
- the present invention therefore relates to a process for the manufacture by dipping of a sheet of mild steel carrying on each of its two faces a coating based on lead whose thickness is different on each face, which consists in printing different roughnesses on each of the two faces of the sheet then to deposit on the sheet, by dipping, a coating based on lead, and to adjust the uniformity of the coating deposited.
- the final Skin-Pass operation performed on mild steel sheet, is performed with two cylinders of different roughness.
- This roughness can vary in notable proportions using, on the one hand, abrasive polishes which can be extremely fine, on the other hand, by roughening the cylinders by blasting with abrasive particles of suitable dimensions, being since there is a close relationship between the size of the abrasive particles and the roughness of the cylinders.
- the amount of coating per unit area is less than or equal to 20 g per m 2
- the amount of coating per unit area is greater than or equal to 40 g per m 2 .
- the dip coating operation is carried out conventionally in a molten bath of Pb-Sn alloy with 8-15% Sn.
- the uniformity of the deposited layers can be adjusted at the outlet from the sealing bath using wiping rolls or by jet finishing, the differences in thickness of the layers deposited for each respective face being preserved by this operation.
- this process makes it possible to obtain a lead sheet which is less expensive than the conventional symmetrical lead sheet.
- the sheet thus obtained has on the other hand on the sheets obtained by an electrolytic process, which have a strictly bare face, the advantage of having a slightly leaded face, which in the case for example of automobile tanks, will be a excellent support for coating a protective product against more or less corrosive aqueous splashes from the road and against stone jets. It should be noted that the coating of Pb-Sn alloy also increases in itself the protection against these two types of attack.
- a mild steel coil is subjected to a conventional preparation preparation for sealing, including annealing in a vacuum before a Skin-Pass operation.
- This Skin-Pass operation is carried out using a train whose working cylinders have different roughness. These roughnesses are such that the Skin-passed sheet has the following roughnesses on each of its two faces:
- the sheet having the properties defined above is then coated by dipping by immersion in a bath of lead alloy comprising 90% lead and 10% tin and brought to 345 ° C., then it is passed between two rollers wipers coated with asbestos to adjust the uniformity of the deposited layers.
- the sheet thus coated is then subjected to a salt spray corrosion resistance test for 24 hours. No traces of corrosion are observed on both sides.
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)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8100868 | 1981-01-19 | ||
| FR8100868A FR2498206A1 (fr) | 1981-01-19 | 1981-01-19 | Toles plombees asymetriques et leur procede de preparation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0056922A1 EP0056922A1 (fr) | 1982-08-04 |
| EP0056922B1 true EP0056922B1 (fr) | 1984-04-18 |
Family
ID=9254276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19810402066 Expired EP0056922B1 (fr) | 1981-01-19 | 1981-12-23 | Procédé de fabrication de tôles plombées asymétriques |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0056922B1 (enExample) |
| JP (1) | JPS57152456A (enExample) |
| DE (1) | DE3163242D1 (enExample) |
| FR (1) | FR2498206A1 (enExample) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007032874A1 (de) * | 2007-07-12 | 2009-01-15 | Wuppermann Ag | Schmelztauchbeschichtetes warmgewalztes Stahlband, seine Herstellung und Verwendung |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0102319B1 (de) * | 1982-07-23 | 1987-08-19 | Ciba-Geigy Ag | Verwendung von Muramylpeptiden oder deren Analogen zur Prophylaxe und Therapie von Virusinfektionen |
| GB2270089A (en) * | 1992-08-24 | 1994-03-02 | Gen Electric | Producing metal coated propulsion tanks for aerospace applications |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE472858C (de) * | 1929-03-06 | Martinswerke G M B H | Verfahren zur Herstellung von auf beiden Seiten ungleich stark verbleiten Baendern | |
| US2141110A (en) * | 1936-11-24 | 1938-12-20 | Charles E Miller | Tin plate |
| US2368128A (en) * | 1940-08-02 | 1945-01-30 | American Rolling Mill Co | Terne coating process |
-
1981
- 1981-01-19 FR FR8100868A patent/FR2498206A1/fr active Granted
- 1981-12-23 EP EP19810402066 patent/EP0056922B1/fr not_active Expired
- 1981-12-23 DE DE8181402066T patent/DE3163242D1/de not_active Expired
-
1982
- 1982-01-19 JP JP673182A patent/JPS57152456A/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007032874A1 (de) * | 2007-07-12 | 2009-01-15 | Wuppermann Ag | Schmelztauchbeschichtetes warmgewalztes Stahlband, seine Herstellung und Verwendung |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3163242D1 (en) | 1984-05-24 |
| FR2498206B1 (enExample) | 1984-01-13 |
| FR2498206A1 (fr) | 1982-07-23 |
| EP0056922A1 (fr) | 1982-08-04 |
| JPS57152456A (en) | 1982-09-20 |
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| Date | Code | Title | Description |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| 17P | Request for examination filed |
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| AK | Designated contracting states |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: UNION SIDERURGIQUE DU NORD ET DE L'EST DE LA FRANC |
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| GRAA | (expected) grant |
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| AK | Designated contracting states |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 26N | No opposition filed | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
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| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
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| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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| GBPC | Gb: european patent ceased through non-payment of renewal fee |
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