WO1990012122A1 - Method for superficial treatment of high temperature resistance tubes and tubes so treated - Google Patents
Method for superficial treatment of high temperature resistance tubes and tubes so treated Download PDFInfo
- Publication number
- WO1990012122A1 WO1990012122A1 PCT/IT1990/000028 IT9000028W WO9012122A1 WO 1990012122 A1 WO1990012122 A1 WO 1990012122A1 IT 9000028 W IT9000028 W IT 9000028W WO 9012122 A1 WO9012122 A1 WO 9012122A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- aluminium
- tubes
- realized
- coating
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000004411 aluminium Substances 0.000 claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000004927 fusion Effects 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 238000007664 blowing Methods 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000010891 electric arc Methods 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
- C21C5/4613—Refractory coated lances; Immersion lances
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
Definitions
- the object of the present invention is a method for superficial treatment of high temperature resistance tubes and tubes so treated.
- the invention finds particular even if not exclusive application for the oxygen blowing in metal fusion (melting furnaces).
- the speed of advancing tube must be proportioned depending from the consumption rate (at example a value of 0,5 m/min. Is actually usual).
- the coating materials are conceived to have thermical resistance (to retard the fusion of the tube) avoiding damage or alteration of the quality of the fusion.
- Tubes of this type have 2/10 mm of a coating stratum.
- the coating material is dry kaolin, or even graphitic powder applied for immersion and successive drying.
- the tnot treated ubes present low cost but involve an advancement speed in the furnace, extremely high causing high tube consumption and comparatively high cost of the fusion.
- the coated tubes involve reduced consumption but the high cost of this ones remains being the consumption speed not so strongly reduced.
- Purpose of the present invention is to obviate to the mentioned drawbacks by means of the realization of coated tubes that: - have reduced cost; - have a high resistance to the destruction in furnace with consequent low supply speed; - the coating in the tubes do not constitutes damage or alteration of the characteristics of the fusion.
- the tube is coated with aluminium oxide that are known to have a resistance of fusion around 2000°C , that allows the required thermic resistance reducing the consumption speed, realizing an extremely high and thin thermic barrier and such that it does not introduce pollution by its destruction in he respective fusion.
- the coating is realized by spraying or pulverization of aluminium in fusion with thermic lance against the tube that is made to advance and to rotate, being preventively heated at the temperature of approx 600°C.
- the oxyacetylene spry temperature being from 2000 to 3000°C in coaxial jet that surrounds the aluminium sputter on the surface of the tube.
- the three coated tubes have been subjected to perforation treatment by oxyacetylene flame: - one not treated; - one with kaolin coating treatment and - one with aluminium oxide coating as claimed.
- Figure 1 represents a schematic view of the system of application of the aluminium stratum on the surface of a tube.
- Figure 2 represents in in smallest dimension the plant view of the tube in treatment.
- the figures disclose that with (1 ) is indicated in section the steel tube to coat, with (s) the superficial coating of aluminium oxide; with (2) the oxyacetylene quill involving a coaxial internal tube (2") for wire aluminium supply (B), while the flame (3') will exit from coaxial nozzle delimited by the external tube (2'), surrounding the aluminium wire (B) and pulverizing it in fusion action (3") with jet on the surface (s) of the tube (1) that in the same time advances and rotates.
- the tube (1) is preheated FM fig .2 by a hurl flame upwards in similar way as represented in Fig .1.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Method for superficial treatment of high temperature resistance steel tubes and tubes so treated, preferably for blowing tubes in metal fusion, characterized in that the steel tube is subjected to a coating of its external surface by means of fused and oxidized aluminium.
Description
Method for superficial treatment of high temperature resistance tubes and tube? so treated
The object of the present invention is a method for superficial treatment of high temperature resistance tubes and tubes so treated.
The invention finds particular even if not exclusive application for the oxygen blowing in metal fusion (melting furnaces).
In prior art is well known that for the oxygen blowing in steel melting furnaces metallic tubes of various centimeters of diameter (Eg. 1/2") are used being introduced in the fusion while oxygen is blowed throughout and meanwhile the metal fusion progressively melts the tube that shall be necessarily continually advanced (for this supply used a blowing tube advancing special machines are used that have the task even to allow the tube in the fusion advanced at a determined speed).
Depending of the tube type and its superficial treatment, there is a more or less rapid consumption, and the speed of advancing tube must be proportioned depending from the consumption rate (at example a value of 0,5 m/min. Is actually usual).
To obviate to the limited life of the oxigen blowing coating tubes have been adopted. The coating materials are conceived to have thermical resistance (to retard the fusion of the tube) avoiding damage or alteration of the quality of the fusion.
Tubes of this type, have 2/10 mm of a coating stratum.
The coating material is dry kaolin, or even graphitic powder applied for immersion and successive drying.
The tnot treated ubes present low cost but involve an advancement speed in the furnace, extremely high causing high tube consumption and comparatively high cost of the fusion.
The coated tubes involve reduced consumption but the high cost of this ones remains being the consumption speed not so strongly reduced.
Purpose of the present invention is to obviate to the mentioned drawbacks by means of the realization of coated tubes that: - have reduced cost; - have a high resistance to the destruction in furnace with consequent low supply speed; - the coating in the tubes do not constitutes damage or alteration of the characteristics of the fusion.
This and other purposes are reached with the present invention as claimed solving the exposed problems by means of a method for superficial treatment of high temperature resistance steel tubes and tubes so treated, preferably for blowing tubes in metal fusion, characterized in that the steel tube is subjected to a coating of its external surface by means of fused and oxidized aluminium. Advantageously the coating with fused and oxidized aluminium is made by means of: - heating the tube at the fusion temperature of the aluminium or in its around (Eg. 600°C); - starting from powder row material or wire row material aluminium, aluminium fused and pulverized is spraied on the external surface of the tube;
- fast cooling preferably by air jet accelerate the respective oxidation of the aluminium his made, that have reacted metallurgically with the preventively cleaned ( deoxidized ) surface of the tube.
In such a way the tube is coated with aluminium oxide that are known to have a resistance of fusion around 2000°C , that allows the required thermic resistance reducing the consumption speed, realizing an extremely high and thin thermic barrier and such that it does not introduce pollution by its destruction in he respective fusion.
Advantageously the coating is realized by spraying or pulverization of aluminium in fusion with thermic lance against the tube that is made to advance and to rotate, being preventively heated at the temperature of approx 600°C. The oxyacetylene spry temperature being from 2000 to 3000°C in coaxial jet that surrounds the aluminium sputter on the surface of the tube.
To understand the high value of the present discovery the three coated tubes have been subjected to perforation treatment by oxyacetylene flame: - one not treated; - one with kaolin coating treatment and - one with aluminium oxide coating as claimed.
The necessary perforation time for the three tubes of the same thickness and same material (steel) resulted respectively 4, 15 and 90 seconds.
The six times better performance of the invention are thus surprisingly relevant respect to the actual prior art most technologically advanced tubes .
These and other advantages will appear from the successive description of realization with the help of the accompanying drawings which particulars of execution are not to be considered limitative but exemplificative solely.
Figure 1 represents a schematic view of the system of application of the aluminium stratum on the surface of a tube.
Figure 2 represents in in smallest dimension the plant view of the tube in treatment.
The figures disclose that with (1 ) is indicated in section the steel tube to coat, with (s) the superficial coating of aluminium oxide; with (2) the oxyacetylene quill involving a coaxial internal tube (2") for wire aluminium supply (B), while the flame (3') will exit from coaxial nozzle delimited by the external tube (2'), surrounding the aluminium wire (B) and pulverizing it in fusion action (3") with jet on the surface (s) of the tube (1) that in the same time advances and rotates. Conveniently the tube (1) is preheated FM fig .2 by a hurl flame upwards in similar way as represented in Fig .1.
Claims
Claims 1. A method for superficial treatment of high temperature resistance steel tubes and tubes so treated, preferably for blowing tubes in metal fusion, characterized in that the steel tube is subjected to a coating of its external surface by means of fused and oxidized aluminium.
2. Method and tube as claimed in claim 1., characterized in that the coating with fused and oxidized aluminium is realized by means of: - heating the tube (1 ) to the fusion temperature of the aluminium or in its around (FM); - pulverized aluminium fused spraying, (3") under forms of powder or pulverized wire on its external surface (s); - fast cooling.
3. Method and tube as claimed in claims 1 , 2, characterized by the fact that said fast cooling happens by air jet means.
4. A method and tube as claimed in claims 1 , 2, characterized in that the application of the aluminium is realized with flame at the temperature of 20000-3000°C.
5. A method and tube as claimed in claims 1 , 2, characterized in that the application of the aluminium is realized with fiame that winds the aluminium spry at the temperature of 20000-3000°.
6. A method and tube as claimed in claims 1 , 2, characterized in that the application of the aluminium is realized with electric arc which flame winds the aluminium spry at the temperature of 2000 -3000°
7. A method and tube as claimed in claims 1 , 2, characterized in that is realized a preheat of the tube by means of flame jet (FM) upwards of the spraying station of the aluminium (FS).
8. A Method and tube as claimed in claims 1 , 2, characterized in that is realized a preheat of the tube and the preheat of the tube and its coating (S) is realized by means of its advancement and contemporary rotation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT83369A/89 | 1989-04-04 | ||
| IT8983369A IT1234618B (en) | 1989-04-04 | 1989-04-04 | METHOD FOR SURFACE TREATMENT OF PIPES FOR RESISTANCE TO HIGH TEMPERATURES AND PIPES SO TREATED. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1990012122A1 true WO1990012122A1 (en) | 1990-10-18 |
Family
ID=11320866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IT1990/000028 WO1990012122A1 (en) | 1989-04-04 | 1990-03-14 | Method for superficial treatment of high temperature resistance tubes and tubes so treated |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU5289890A (en) |
| IT (1) | IT1234618B (en) |
| WO (1) | WO1990012122A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2756756A1 (en) * | 1996-12-09 | 1998-06-12 | Inst Polytechnique De Sevenans | METHOD AND DEVICE FOR MAKING A COATING ON A SUBSTRATE |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191415960A (en) * | 1914-07-03 | 1915-07-05 | Reginald Keble Morcom | An Improved Process of and Apparatus for Applying Coatings to Various Surfaces or Materials. |
| FR2227140A1 (en) * | 1973-04-25 | 1974-11-22 | Foseco Int | |
| US3959030A (en) * | 1974-12-30 | 1976-05-25 | Sumitomo Metal Industries, Ltd. | Method of producing aluminum coated steel |
| DE2523135A1 (en) * | 1975-05-24 | 1976-12-09 | Contherm Ind Und Huettenbedarf | Refractory coating for metallurgical lances - using alumina mixed with ferric oxide, lithium aluminium silicate, and cobalt oxide |
| GB1497398A (en) * | 1975-04-15 | 1978-01-12 | British Steel Corp | Arc-sprayed protective coatings |
| DE2913805A1 (en) * | 1979-04-05 | 1980-10-23 | Siemens Ag | SURFACE PROTECTION FOR PARTS OF A HOT TINNING SYSTEM |
| EP0172030A2 (en) * | 1984-08-15 | 1986-02-19 | National Research Development Corporation | Flow coating of metals |
-
1989
- 1989-04-04 IT IT8983369A patent/IT1234618B/en active
-
1990
- 1990-03-14 AU AU52898/90A patent/AU5289890A/en not_active Abandoned
- 1990-03-14 WO PCT/IT1990/000028 patent/WO1990012122A1/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191415960A (en) * | 1914-07-03 | 1915-07-05 | Reginald Keble Morcom | An Improved Process of and Apparatus for Applying Coatings to Various Surfaces or Materials. |
| FR2227140A1 (en) * | 1973-04-25 | 1974-11-22 | Foseco Int | |
| US3959030A (en) * | 1974-12-30 | 1976-05-25 | Sumitomo Metal Industries, Ltd. | Method of producing aluminum coated steel |
| GB1497398A (en) * | 1975-04-15 | 1978-01-12 | British Steel Corp | Arc-sprayed protective coatings |
| DE2523135A1 (en) * | 1975-05-24 | 1976-12-09 | Contherm Ind Und Huettenbedarf | Refractory coating for metallurgical lances - using alumina mixed with ferric oxide, lithium aluminium silicate, and cobalt oxide |
| DE2913805A1 (en) * | 1979-04-05 | 1980-10-23 | Siemens Ag | SURFACE PROTECTION FOR PARTS OF A HOT TINNING SYSTEM |
| EP0172030A2 (en) * | 1984-08-15 | 1986-02-19 | National Research Development Corporation | Flow coating of metals |
Non-Patent Citations (2)
| Title |
|---|
| Metallkeramik und Plasmaspritzen, E. KRETZ-SCHNAR, VEB Verlag Technik, 1963 (Berlin, DE) page 290 * |
| Welding & Metal Fabrication, Vol. 56, No. 5, July 1988 (Redhill, Surrey, GB) R.C. COBB: "Hard Surface Coatings by Electric Arc Spraying", pages 226-231 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2756756A1 (en) * | 1996-12-09 | 1998-06-12 | Inst Polytechnique De Sevenans | METHOD AND DEVICE FOR MAKING A COATING ON A SUBSTRATE |
| WO1998026104A1 (en) * | 1996-12-09 | 1998-06-18 | Institut Polytechnique De Sevenans | Method and device for producing a coating on a substrate |
Also Published As
| Publication number | Publication date |
|---|---|
| AU5289890A (en) | 1990-11-05 |
| IT1234618B (en) | 1992-05-25 |
| IT8983369A0 (en) | 1989-04-04 |
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