EP0095953A1 - Verfahren zum Erwärmen beschichteter Bänder zur Umwandlung der Beschichtungsstruktur, insbesondere beim Herstellen verzinkter Bleche - Google Patents
Verfahren zum Erwärmen beschichteter Bänder zur Umwandlung der Beschichtungsstruktur, insbesondere beim Herstellen verzinkter Bleche Download PDFInfo
- Publication number
- EP0095953A1 EP0095953A1 EP83400920A EP83400920A EP0095953A1 EP 0095953 A1 EP0095953 A1 EP 0095953A1 EP 83400920 A EP83400920 A EP 83400920A EP 83400920 A EP83400920 A EP 83400920A EP 0095953 A1 EP0095953 A1 EP 0095953A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- heating
- carried out
- strip
- blowing
- 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.)
- Withdrawn
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000011248 coating agent Substances 0.000 title claims description 7
- 238000000576 coating method Methods 0.000 title claims description 7
- 230000009466 transformation Effects 0.000 title description 3
- 238000004519 manufacturing process Methods 0.000 title description 2
- 238000007664 blowing Methods 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims 1
- 230000001131 transforming effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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
- C21D1/34—Methods of heating
-
- 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
-
- 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
- C23C2/26—After-treatment
- C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
-
- 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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
Definitions
- the present invention relates to the heating of coated strips, for transformation of the structure of the coating. It is known that, in the field of the manufacture of galvanized sheets, it is desired, for certain applications, to transform the zinc of the coating into an iron-zinc alloy.
- the rate of diffusion of iron through the zinc coating depends on both the temperature of the metal and its coating, as well as the residence time at this temperature. In general, it suffices to bring the coated strip from 450 to 550 ° C. in approximately a few seconds, then to allow it to cool in ambient air for a few other seconds, to effect the diffusion of the iron in the zinc in the desired proportions.
- the heating of the strip is generally carried out by means of burners with direct impact of the flame on the strip, this flame being able to be cylindrical or planar.
- a high combustion temperature and, on the other hand, a heating carried out over a short length, the gases escaping from the heating installation are still very hot, and the thermal yield obtained is relatively low, between 10 and 20%.
- This result can be improved by providing, in the heating installation, a recovery zone which makes it possible both to exhaust the fumes and to add maintenance after heating. Under these conditions, heating can be done at a slightly lower temperature.
- the invention proposes to provide a method of heating coated strips making it possible to increase this thermal efficiency, to a significant extent.
- the heating method according to the invention is characterized in that it exclusively uses convective exchanges, the heating being carried out by blowing a gas at a temperature below 1000 ° C., preferably of the order from 800 to 1000 ° C.
- the hot gas is blown perpendicular to the strip, over the entire height of the heating installation.
- This produces heating by orthogonal convection which ensures very high heat exchange homogeneity, unlike the results obtained with certain heating systems using burners with direct cylindrical flame impact s.
- the method according to the invention also has the advantage of being able to operate in a closed neutral gas circuit, which makes it possible to implement it in galvanizing installations on a single face without risk of oxidation of the uncoated face. .
- the blowing of the gas onto the strip can advantageously be carried out through slots or sheets perforated with circular orifices, or a combination of the two, placed at a short distance from the strip.
- the blown gas after its exchange with the strip, is taken up by a recirculation fan at high temperature.
- a gas exchanger or heater which can be powered by energy from combustion or electrical energy.
- This exchanger provides the additional heat necessary to bring the temperature of the return gas, already hot, to that which it must have on blowing.
- Electrical energy can be supplied, for example, through resistors, or by a plasma torch.
- the combustion energy is released inside radiant tubes, swept externally by the recirculated gas.
- These radiant tubes can be supplied with any fuel (gas or fuel).
- the recirculated gas can be air, but also a neutral gas, providing protection of the strip against oxidation.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Coating With Molten Metal (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8209250 | 1982-05-27 | ||
| FR8209250A FR2527638A1 (fr) | 1982-05-27 | 1982-05-27 | Procede de chauffage de bande revetue pour transformation de la structure du revetement, notamment pour la realisation de toles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0095953A1 true EP0095953A1 (de) | 1983-12-07 |
Family
ID=9274395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83400920A Withdrawn EP0095953A1 (de) | 1982-05-27 | 1983-05-06 | Verfahren zum Erwärmen beschichteter Bänder zur Umwandlung der Beschichtungsstruktur, insbesondere beim Herstellen verzinkter Bleche |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0095953A1 (de) |
| FR (1) | FR2527638A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2128296A1 (de) * | 2008-05-26 | 2009-12-02 | Aga AB | Verfahren für galvanisierte Stahlmaterialien |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1157834A (fr) * | 1955-08-26 | 1958-06-04 | Stein & Roubaix | Four chauffé par convection |
| US3262688A (en) * | 1965-06-03 | 1966-07-26 | Midland Ross Corp | Jet convection heat transfer |
| US3322558A (en) * | 1963-06-14 | 1967-05-30 | Selas Corp Of America | Galvanizing |
| GB1232191A (de) * | 1969-01-06 | 1971-05-19 | ||
| GB2009248A (en) * | 1977-11-30 | 1979-06-13 | Inland Steel Co | Hot-dip galvanizing and alloying |
-
1982
- 1982-05-27 FR FR8209250A patent/FR2527638A1/fr not_active Withdrawn
-
1983
- 1983-05-06 EP EP83400920A patent/EP0095953A1/de not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1157834A (fr) * | 1955-08-26 | 1958-06-04 | Stein & Roubaix | Four chauffé par convection |
| US3322558A (en) * | 1963-06-14 | 1967-05-30 | Selas Corp Of America | Galvanizing |
| US3262688A (en) * | 1965-06-03 | 1966-07-26 | Midland Ross Corp | Jet convection heat transfer |
| GB1232191A (de) * | 1969-01-06 | 1971-05-19 | ||
| GB2009248A (en) * | 1977-11-30 | 1979-06-13 | Inland Steel Co | Hot-dip galvanizing and alloying |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2128296A1 (de) * | 2008-05-26 | 2009-12-02 | Aga AB | Verfahren für galvanisierte Stahlmaterialien |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2527638A1 (fr) | 1983-12-02 |
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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 |
Designated state(s): AT BE DE GB IT LU NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19840808 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: WANG, ROBERT |