FR2477923A1 - Water spray cooling process, esp. in continuous casting - with addn. of ions to water to reduce wear of rolls - Google Patents
Water spray cooling process, esp. in continuous casting - with addn. of ions to water to reduce wear of rolls Download PDFInfo
- Publication number
- FR2477923A1 FR2477923A1 FR8005381A FR8005381A FR2477923A1 FR 2477923 A1 FR2477923 A1 FR 2477923A1 FR 8005381 A FR8005381 A FR 8005381A FR 8005381 A FR8005381 A FR 8005381A FR 2477923 A1 FR2477923 A1 FR 2477923A1
- Authority
- FR
- France
- Prior art keywords
- ions
- water
- cooling
- rolls
- proportion
- 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.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 238000001816 cooling Methods 0.000 title claims abstract description 15
- 150000002500 ions Chemical class 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 7
- 238000009749 continuous casting Methods 0.000 title abstract description 4
- 239000007921 spray Substances 0.000 title description 2
- 238000005098 hot rolling Methods 0.000 claims abstract description 3
- 238000005507 spraying Methods 0.000 claims abstract description 3
- 239000000498 cooling water Substances 0.000 claims abstract 3
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000007792 addition Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 150000001768 cations Chemical class 0.000 claims 1
- 238000001704 evaporation Methods 0.000 claims 1
- 230000008020 evaporation Effects 0.000 claims 1
- 239000013505 freshwater Substances 0.000 claims 1
- 230000000977 initiatory effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- -1 CrO4(2-) ions Chemical class 0.000 abstract 3
- 229910020489 SiO3 Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 239000011686 zinc sulphate Substances 0.000 description 1
- 235000009529 zinc sulphate Nutrition 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1245—Accessories for subsequent treating or working cast stock in situ for cooling using specific cooling agents
-
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
Description
L'invention a pour objet un procédé de refroidissement par pulvérisation d'eau utilisable en particulier en coulée continue. The subject of the invention is a water spray cooling method which can be used in particular in continuous casting.
On sait qu'en coulée continue la barre sortant de la lingotière se présente sous la forme d'un tube dont la section droite a la dimension de la section de la lingotière et dont les parois sont constituées par l'acier solidifié dans la lingotière. L'acier liquide résiduel est contenu à l'intérieur de ces parois d'acier solidifié. La solidification de cette partie encore liquide se poursuit dans une zone dite de refroidissement secondaire. La barre est guidée dans cette zone par des rouleaux d'axe perpendiculaire au sens de défilement, de diamètre et d'écartement croissants depuis la partie inférieure de la lingotière jusqu'à la fin de la zone. Des systèmes d'aspersion d'eau sont disposés entre ces rouleaux. Le refroidissement s'effectue par échanges avec les rouleaux supports, par rayonnement et par aspersion d'eau sur les surfaces externes de la barre.La chaleur extraite par conduction à travers l'e- paisseur des parois solidifiées provient de la solidification en cours sur la face interne des parois solidifiées et de la perte de température de ces dernières. It is known that in continuous casting the bar leaving the ingot mold is in the form of a tube, the cross section of which has the dimension of the section of the ingot mold and the walls of which are constituted by the steel solidified in the ingot mold. The residual liquid steel is contained inside these solidified steel walls. The solidification of this still liquid part continues in a so-called secondary cooling zone. The bar is guided in this zone by rollers with an axis perpendicular to the direction of travel, of increasing diameter and spacing from the lower part of the mold until the end of the zone. Water sprinkler systems are arranged between these rollers. Cooling takes place by exchanges with the support rollers, by radiation and by spraying water on the external surfaces of the bar. The heat extracted by conduction through the thickness of the solidified walls comes from the solidification in progress on the inner face of the solidified walls and the loss of temperature thereof.
Les rouleaux de guidage situés dans la zone de refroidissement secondaire, qui sont au contact des surfaces de la barre, subissent des cycles de température de surface qui, en régime de rotation continue des rouleaux, évoluent, suivant le type de rouleaux et la vitesse de rotation, de 200 à 5000C au droit du contact à 50 à 1000C en dehors de la région du contact. The guide rollers located in the secondary cooling zone, which are in contact with the surfaces of the bar, undergo surface temperature cycles which, in the continuous rotation regime of the rollers, change, depending on the type of rollers and the speed of rotation, from 200 to 5000C at the contact level to 50 to 1000C outside the contact region.
Ces cycles thermiques s'amortissent dans l'épais- seur de la chemise, refroidie ou non intérieurement, du rouleau. Les fluctuations de gradients de temperature correspondantes engendrent des contraintes dans le métal constitutif de la chemise du rouleau dont l'amplitude des variations au cours d'un tour de rotation est telle qu'elles créent en surface un état de fatigue thermique qui amène dans un délai plus ou moins long la ruine du rouleau par rupture brutale. These thermal cycles are damped in the thickness of the jacket, cooled or not internally, of the roller. The corresponding temperature gradient fluctuations generate stresses in the metal constituting the jacket of the roller, the amplitude of the variations during a rotation is such that they create on the surface a state of thermal fatigue which brings about a more or less long delay the ruin of the roller by sudden rupture.
On a constaté que l'usure de la surface du rouleau en contact avec la barre était beaucoup plus importante et le processus de fatigue thermique du rouleau beaucoup plus rapide dans la zone de refroidissement secondaire, où les rouleaux sont constamment mouillés en surface par les systèmes d'aspersion d'eau, que dans les zones suivantes dépourvues de systèmes d'aspersion. It was found that the wear of the surface of the roller in contact with the bar was much greater and the thermal fatigue process of the roller much faster in the secondary cooling zone, where the rollers are constantly wetted on the surface by the systems. only in the following areas without sprinkler systems.
Pour diminuer cette usure et la fissuration con sécutive au phénomène de fatigue thermique, des aciers de différentes compositions ont e été proposés pour les chemises des rouleaux. Cette solution est généralement onéreuse et ne donne pas toujours satisfaction. To reduce this wear and subsequent cracking due to thermal fatigue, steels of different compositions have been proposed for the liners of the rollers. This solution is generally expensive and is not always satisfactory.
La présente invention apporte une autre solution à ce problème. Elle consiste à ajouter à l'eau pulvérisée dans la zone du refroidissement secondaire une combinaison de certains ou de tous les éléments inhibiteurs suivants, dans les proportions indiquées en milligrammes par litre d'eau - Ions CrO4 en proportion de 5 à 300 mg/l, par exemple
sous forme de Na2Cr04, 4 H20 ou autre composition.The present invention provides another solution to this problem. It consists in adding to the water sprayed in the secondary cooling zone a combination of some or all of the following inhibitory elements, in the proportions indicated in milligrams per liter of water - CrO4 ions in proportion from 5 to 300 mg / l , for example
in the form of Na2Cr04, 4 H20 or other composition.
- Ions Zn++ en proportion de 10 à 150 mg/l, par exemple
sous forme de ZnS04, 7 H20 ou autre composition.- Zn ++ ions in proportion from 10 to 150 mg / l, for example
in the form of ZnSO4, 7 H20 or other composition.
- Ions so4 en proportion de 300 à 1200 mu/#1, sous forme
de sulfates de sodium, de potassium, de zinc (déjà cité),
ou autre composition.- Ions so4 in proportion from 300 to 1200 mu / # 1, in the form
sodium, potassium, zinc sulfates (already mentioned),
or other composition.
- Ions Si03-- en proportion de 30 à 60 mg/l sous forme de
Si02, Na20, 5 H20 ou autre composition.- Si03 ions-- in proportion from 30 to 60 mg / l in the form of
Si02, Na20, 5 H20 or other composition.
De plus, on veillera à maintenir le ph de l'eau contenant ces additions, entre 6 et 9. In addition, care will be taken to maintain the pH of the water containing these additions, between 6 and 9.
Grâce à l'invention, l'usure des chemises des rouleaux réalisés en métaux usuels tels que les aciers faiblement alliés au chrome, molybdène, voire vanadium, est réduite à quelques dixièmes de millimètres par an et la durée des phases d'amorçage et de propagation des fissures de fatigue thermique est notablement allongée, au point que la durée de vie jusqu'à rupture des chemises de ces rouleaux est multipliée par un facteur de l'ordre de 1,5 à 5 et quelquefois plus, suivant le cas. L'économie ainsi réalisée sur le poste pièces de rechange est donc d'autant plus appréciable qu'elle permet de continuer à utiliser des rouleaux fabriqués avec des matériaux usuels de coût limité. Thanks to the invention, the wear on the liners of rollers made of common metals such as steels which are weakly alloyed with chromium, molybdenum, or even vanadium, is reduced to a few tenths of a millimeter per year and the duration of the initiation and The propagation of thermal fatigue cracks is notably lengthened, to the point that the service life until the linings of these rollers rupture is multiplied by a factor of the order of 1.5 to 5 and sometimes more, depending on the case. The savings thus made on the spare parts station is therefore all the more appreciable as it allows the use of rollers made with usual materials of limited cost to be continued.
Pour que cette économie ne soit pas grévée par le coût de traitement des eaux avec les éléments préconisés, il sera avantageux de faire circuler cette eau en circuit fermé et en compensant par des ajouts lteau rejetée à l'at- mosphère sous forme de buée provenant de la vaporisation sur la surface de la barre d'acier coulée. Il suffira alors de veiller au maintien du ph de cette eau comme on le réalise déjà sur les installations industrielles, et contrôler périodiquement la teneur des additifs dans l'eau. So that this saving is not burdened by the cost of water treatment with the recommended elements, it will be advantageous to circulate this water in a closed circuit and by compensating with additions of the water discharged to the atmosphere in the form of mist from vaporization on the surface of the cast steel bar. It will then suffice to ensure that the ph of this water is maintained as is already the case on industrial installations, and to periodically check the content of the additives in the water.
L'invention peut être utilisée dans des domaines techniques voisins et appliquée notamment aux cylindres de laminoirs à chaud ou aux cylindres guides des tôles dans les refroidissoirs. The invention can be used in neighboring technical fields and applied in particular to rolls of hot rolling mills or to guide rolls of sheets in coolers.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8005381A FR2477923A1 (en) | 1980-03-11 | 1980-03-11 | Water spray cooling process, esp. in continuous casting - with addn. of ions to water to reduce wear of rolls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8005381A FR2477923A1 (en) | 1980-03-11 | 1980-03-11 | Water spray cooling process, esp. in continuous casting - with addn. of ions to water to reduce wear of rolls |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2477923A1 true FR2477923A1 (en) | 1981-09-18 |
| FR2477923B1 FR2477923B1 (en) | 1985-03-22 |
Family
ID=9239521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8005381A Granted FR2477923A1 (en) | 1980-03-11 | 1980-03-11 | Water spray cooling process, esp. in continuous casting - with addn. of ions to water to reduce wear of rolls |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2477923A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0142341A1 (en) * | 1983-11-10 | 1985-05-22 | Aluminum Company Of America | Continuous casting |
| WO2004042115A1 (en) * | 2002-10-30 | 2004-05-21 | Ge Betz, Inc. | Methods for inhibiting intergranular corrosion of metal surfaces |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1031799A (en) * | 1951-01-03 | 1953-06-26 | Parker Ste Continentale | Process for the protection of working components in rolling installations |
| DE902543C (en) * | 1941-09-19 | 1954-01-25 | Ver Leichtmetall Werke Ges Mit | Process for the continuous casting of metal blocks |
| LU43065A1 (en) * | 1962-01-24 | 1963-03-22 |
-
1980
- 1980-03-11 FR FR8005381A patent/FR2477923A1/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE902543C (en) * | 1941-09-19 | 1954-01-25 | Ver Leichtmetall Werke Ges Mit | Process for the continuous casting of metal blocks |
| FR1031799A (en) * | 1951-01-03 | 1953-06-26 | Parker Ste Continentale | Process for the protection of working components in rolling installations |
| LU43065A1 (en) * | 1962-01-24 | 1963-03-22 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0142341A1 (en) * | 1983-11-10 | 1985-05-22 | Aluminum Company Of America | Continuous casting |
| WO2004042115A1 (en) * | 2002-10-30 | 2004-05-21 | Ge Betz, Inc. | Methods for inhibiting intergranular corrosion of metal surfaces |
| CN100425735C (en) * | 2002-10-30 | 2008-10-15 | Ge贝茨公司 | Methods for inhibiting intergranular corrosion of metal surfaces |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2477923B1 (en) | 1985-03-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |