DE60105570T2 - Hot rolling process for rolling aluminum and aluminum alloy sheets - Google Patents

Abstract

The present invention relates to a water-soluble aluminium and aluminium alloys hot rolling composition comprising a base stock oil and, based on the total weight of the composition, from 1 to 80% by weight of di(2-ethylhexyl) adipate ester. The invention also relates to an oil-in-water emulsion, to a process for hot rolling aluminium and aluminium alloys and to the use of the oil-in-water emulsion in a hot rolling process. <IMAGE>

Description

The The present invention relates to a hot rolling method for rolling of aluminum and aluminum alloy sheets.

The The invention also relates to a water-soluble aluminum and aluminum alloy hot rolling oil composition, an oil-in-water emulsion made therewith and the use of the oil-in-water emulsion in a hot rolling process.

The Rolling industry for Aluminum and aluminum alloys express the need for maximization the efficiency of their rolling metal production processes. Generally speaking This means that you can at higher Rolling speeds would like to work and would like to produce more marketable products per operating shift. It There is also a desire to minimize the number of passes the rolling mill that performed to reach a given level of reduction. Both These paths require quality and surface finish no compromises are made.

• – höheres Verminderungsverhältnis: in den meisten Fällen lässt sich Verringerung in einem Durchlauf erreichen,
• – bessere Walzfähigkeit (d. h. eine niedrigere Walzkraft und ein verringerter Energieverbrauch), verglichen mit der Walzfähigkeit, die mit Ölzusammensetzungen des Standes der Technik erreicht wird,
• – verbesserte Qualität der gewalzten Oberfläche;
• – kürzere Einlaufperiode der Emulsion, die die Zeit ist, die erforderlich ist, um die optimale Partikelgrößenverteilung zu erhalten;
• – hervorragende Korrosionsbeständigkeit und
• – hohe Schmierfähigkeit (Ablagerungseigenschaften, Walzbeschichtung).

The invention thus provides an oil composition for hot rolling mills which offer the customer the following advantages:

• Higher reduction ratio: in most cases reduction can be achieved in one pass,
• Better rolling capability (ie lower rolling force and reduced energy consumption) compared to the rolling capability achieved with prior art oil compositions,
• - improved quality of the rolled surface;
• - shorter break-in period of the emulsion, which is the time required to obtain the optimum particle size distribution;
• - excellent corrosion resistance and
• - high lubricity (deposit properties, roll coating).

The The invention is in each type of hot rolling on roughing, compound and combination rolling mills effective, which may be reversed type or not.

specially the invention shows high reduction and rolling capabilities, while an excellent surface finish of the sheet metal strip is delivered when at high speed is rolled.

Of the Prior art teaches neither the present invention nor specifies he near her.

FR-A-2 168,989 describes the cold rolling of aluminum using a composition including di (2-ethylhexyl) adipate ester.

The Invention thus provides a hot rolling process for rolling aluminum and aluminum alloy sheets comprising an effective amount of an oil-in-water emulsion is applied, which contains water and a water-soluble oil composition, the a base material oil and, based on the total weight of the water-soluble oil composition, 1 to 80 Wt .-% and preferably 3 to 30 wt .-% di (2-ethylhexyl) adipate ester.

In one embodiment, the oil composition further contains, based on the total weight of the composition, from 0.05% to 20%, preferably from 0.1% to 5%, by weight of a nonionic surfactant, such as ethylene oxide addition polymer. An example of such an ethylene oxide addition polymer is the ethylene oxide addition polymer that is offered by the company ICI under the trade name Hypermer ^® A60.

According to one another embodiment contains the oil composition further, based on the total weight of the composition, 1 to 30%, preferably 5 to 20% oleic acid. It In fact, it is believed that the free oleic acid is the aluminum or aluminum alloy strip a better surface finish gives.

The The invention further provides a water-soluble aluminum and aluminum alloy hot rolling oil composition.

The The invention further provides a process for the preparation of the water-soluble oil composition.

The Invention also provides an oil-in-water emulsion, the the oil composition contains and a process for producing this emulsion.

moreover the invention provides the use of the water-soluble oil composition according to the invention for the preparation of emulsions using an aluminum or aluminum alloy hot rolling process should be used.

Finally delivers the invention the use of the emulsion in a hot rolling process.

The Invention will now be disclosed in more detail in the following description.

1 Fig. 12 is a graph showing the applied rolling force versus the number of passes, first, when an emulsion of the prior art is used, and when an emulsion of the present invention is used.

2 Fig. 4 is a graph showing net roll force versus number of passes, first, when using a prior art emulsion and when using an emulsion of the present invention.

The water-soluble oil compositions the invention are undiluted oil concentrates, which are generally diluted in water to oil-in-water emulsions to surrender.

The Base stock oil is every oil, typically used in the hot rolling sector. It can be paraffinic or naphthenic.

paraffin fish base oils can from crude oils which have relatively high alkane contents (high paraffin content). and isoparaffin contents). Typical crude oils are from the Middle East, the North Sea, the middle US continent. The manufacturing process requires aromatics removal (usually by solvent extraction) and dewaxing. Paraffinic base oils are characterized by their good viscosity / temperature characteristics, d. H. high viscosity index, adequate Low temperature properties and good stability. They are often used as solvent Neutral, where solvent means that the base oil with solvent (Solvent) has been refined and neutral means that the oil has a has neutral pH. An alternative name is base oil with high viscosity Index (HVI). They are available in a full range of viscosities light spindle oils available up to viscous brightstocks.

naphthenic base oils have one naturally low pour point, are wax-free and have excellent dissolving power. Solvent extraction and hydrotreating used to reduce the content of polycyclic aromatic compounds.

One preferred base oil is a mixture of paraffinic and naphthenic oils.

The base oil typically has a viscosity from 7 to 150 cSt at 40 ° C, preferably 20 to 50 cSt at 40 ° C.

The water-soluble oil composition preferably contains a trialkanolamine (C _2-4 ), preferably triethanolamine, the amount of which is such that all bondable trialkanolamine is bound to only a portion of the oleic acid. This embodiment aims to ensure that free oleic acid remains in the oil composition.

The Product of the reaction of trialkanolamine with oleic acid acts as a surfactant.

The water-soluble oil composition may contain conventional additives such as surfactants, coupling agents or cosurfactants, Friction reducing agents or lubricity agents, anti-corrosion agents or antioxidants, extreme pressure and antiwear agents, Bactericides and fungicides, antifoam agents, anti-rust agents included.

Examples for antifoam agents are those based on silicone, in particular polydimethylsiloxane.

Examples for anti-corrosion agent are hindered phenols and zinc dialkyldithiophosphates (ZDDP).

Examples for extreme pressure and antiwear agents are dilauryl phosphate, didodecyl phosphite, trialkyl phosphate such as tri (2-ethylhexyl) phosphate, Tricresyl phosphate (TCP), zinc dialkyl (or diaryl) dithiophosphate (ZDDP), phosphosulfurized fatty oils, Zinc dialkyl dithiocarbamate, mercaptobenzothiazole, sulfurized fatty oils, sulfurized Terpenes, sulfurized oleic acid, alkyl and aryl polysulfides, sulfurized sperm oil, sulfurized mineral oil, with sulfur chloride treated fatty oils, Chloronaphthaxanthat, cetyl chloride, chlorinated paraffinic oils, chlorinated Paraffin wax sulfides, chlorinated paraffin wax and zinc dialkyl (or -diaryl) dithiophosphate (ZDDP), tricresyl phosphate (TCP), trixylyl phosphate (TXP) or dilauryl phosphate.

Examples for anti-corrosion agent or antioxidants are radical scavengers such as phenolic antioxidants (sterically hindered), aminic antioxidants, organocopper salts, Decomposers for Hydroperoxides, butylated hydroxytoluene.

Examples for anti-rust agent are amine derivatives of alkenyl succinic anhydride.

Examples of friction reducing / lubricity agents are fatty acids (C ₁₂ to C ₂₀ ) such as lauric acid, oleic acid, palmitic acid, alkyl (C ₆ to C ₁₀ ) alkylate (C ₁₂ to C ₂₀ ) esters such as di (2-ethylhexyl) adipate.

Further Elements of base oils and additives can be found in "Chemistry and Technology of Lubricants ", R. M. Mortier and S.T. Orszulik, VCH Publishers, Inc., 1992.

• – 0,1 bis 0,5% Trialkyl(C_1–9)phenol,
• – 0,5 bis 4,0% Trialkyl(C_3–10)phosphatester,
• – 5 bis 15% Di(2-ethylhexyl)adipatester,
• – 5 bis 15% organische Fettsäure (C_12–20),
• – 0,5 bis 2% 5-Carboxy-4-hexyl-2-cyclohexen-1-octansäure,
• – 1 bis 3% Alkylen(C₂- bis C₆)-glykol;
• – 0,3 bis 1% ethoxylierte Alkohole (C_5–14, die 2 bis 10 CH₂O-Gruppen enthalten),
• – 2 bis 5% Trialkanolamin (C₂ bis C₄),
• – als Rest eine Mischung naphthenischer und paraffinischer Schmierbasisöle.

The following is an example of the content of the water-soluble oil composition of the present invention (the percentages are by weight based on the total weight of the composition):

• 0.1 to 0.5% trialkyl (C _1-9 ) phenol,
• 0.5 to 4.0% trialkyl (C _3-10 ) phosphate ester,
• 5 to 15% di (2-ethylhexyl) adipate ester,
• 5 to 15% organic fatty acid (C _12-20 ),
• 0.5 to 2% of 5-carboxy-4-hexyl-2-cyclohexene-1-octanoic acid,
• - 1 to 3% alkylene (C ₂ - to C ₆ ) glycol;
• From 0.3 to 1% of ethoxylated alcohols (C _5-14 containing 2 to 10 CH ₂ O groups),
• 2 to 5% trialkanolamine (C ₂ to C ₄ ),
• - the remainder a mixture of naphthenic and paraffinic lubricating base oils.

The oil composition is made by adding the base oil and the other ingredients preferably with stirring or mixed with any mixing device, preferably Meanwhile the temperature is controlled so that it does not exceed 50 ° C and especially 35 ° C.

An oil-in-water emulsion is prepared by stirring the oil composition of the invention diluted in water becomes. It is preferred to use deionized water that previously at about 35 ° C heated may have been.

The Contains emulsion generally water and, based on the total volume of the emulsion, 0.5 to 30% by volume, preferably 1 to 15% by volume of the oil composition.

The Aluminum alloys to which the invention can be applied are any aluminum alloys, including the series 1000, 2000, 3000, 5000, 6000 and 7000.

The Hot rolling process can be the classical method. The temperature of the rolled metal is generally about 600 to 650 ° C on roughing mills and about 400 to 450 ° C on compound rolling mills.

The Method is preferably on a roughing mill or a composite mill or a finishing mill. The present oil composition allows a significant reduction in the number of passes. With conventional oils In the prior art, the number of passes was typically 13. The oil composition of the invention allows reducing this number by two passes, which is a significant improvement is.

If the hot rolling process is carried out on a roughing mill, contains the emulsion is preferably based on the total volume of the emulsion, 2 to 4% by volume of the oil composition.

When the hot rolling process is carried out in a finishing or compound rolling mill, the emulsion preferably contains from 5 to 7% by volume, based on the total volume of the emulsion, of the oil composition Zung.

The The following examples illustrate the invention without restricting it. All Refer to parts and ratios on the weight, unless otherwise stated.

EXAMPLE

A Composition is made by adding the ingredients of table 1 in the order they are mixed in this table appear. The temperature is then kept at a maximum of 35 ° C, to a complete resolution and to ensure homogenization of the ingredients, without the properties to affect the emulsion.

Table 1

The Characteristics of the composition of Table 1 are in Table 2 described.

Table 2

A Emulsion is prepared by stirring with the oil composition of Table 1 diluted in deionized water will, that at 35 ° C preheated has been. The characteristics of the emulsion obtained are shown in Table 3 reproduced.

Table 3

EXPERIMENTAL TESTING

First A blank was prepared by using an oil composition of the prior art the technique diluted having the composition described in Table 4:

Table 4

Two Emulsions are prepared by respective dilution of the oil composition of the invention and the oil composition of the prior art in deionized water.

measurements with a Sephy zetameter showed that the zeta potential of the two Emulsions -62 mV which means that these emulsions have high stability.

• – Walzwerktyp: 2 hoch
• – Motorleistung: 45 kW oder 67 kW
• – Walzendurchmesser: 760 mm
• – Walzenhärte: 58 bis 61 Rockwell C
• – Maximalmetallbreite: 685 mm
• – typische Metallbreite: 305 mm
• – Maximalgeschwindigkeit: 30 m/Min
• – Eingangstemperatur (Barren): 450°C
• – Barrendimensionen: 305 × 610 × 1650 mm
• – Enddicke: 25,4 mm
• – Emulsionsvolumen: 400 L
• – Emulsionstemperatur: 50°C
• – Emulsionskonzentration: 5%.

Both emulsions were evaluated on an industrial test mill. The rolling conditions were as follows:

• - Rolling type: 2 high
• - Engine power: 45 kW or 67 kW
• - roll diameter: 760 mm
• - Roller hardness: 58 to 61 Rockwell C
• - Maximum metal width: 685 mm
• - typical metal width: 305 mm
• - maximum speed: 30 m / min
• - Input temperature (ingots): 450 ° C
• - Bar dimensions: 305 × 610 × 1650 mm
• - Final thickness: 25.4 mm
• - Emulsion volume: 400 L
• - Emulsion temperature: 50 ° C
• - Emulsion concentration: 5%.

• 1. Die AA5182-Blöcke wurden leicht geschält, mit Methylethylketon entfettet und auf 454°C erhitzt.
• 2. Die Walzwerkwalzen wurden in einer verdünnten Natriumhydroxidlösung gewaschen, um die Walzbeschichtung von jeglichem vorhergehenden Walzen zu entfernen, und dann abgespült. Das Spülwasser wurde auf Restalkali überprüft. Ein Profilometer wurde zur Messung der Oberflächenrauheit verwendet.
• 3. Die Walzen wurden unter Verwendung von Quarzrohrheizern auf 77°C vorgeheizt.
• 4. Die Kühlsprays wurden eingestellt, um einen Durchfluss von 200 L/Min mit einem Druck von 6,9·10⁴ Newton/m² (10 psig) auf den oberen Sprühkopf und 4,1·10⁵ Newton/m² (60 psig) auf den unteren Kopf zu ergeben.
• 5. Ein 100 cm (4 Zoll) dicker Block aus AA5182 erhielt 5 Walzdurchläufe unter Verwendung des folgenden nominellen Durchlaufschemas. Die Walzgeschwindigkeit war 18,3 m/Min. Alle Durchläufe erfolgten in der Walzrichtung von Ost nach West. Die Einstellungen für den Walzspalt wurden für die erste getestete Emulsion aufgezeichnet und dann für die verbleibenden Emulsionen dupli ziert. Diese Einstellungen lagen 1,27 mm unter der nominellen gewünschten Austrittsdicke bei jedem Durchlauf. Nominelles Durchlaufschema: Durchlauf 1 100 mm – 83 mm Durchlauf 2 83 mm – 65 mm Durchlauf 3 65 mm – 50 mm Durchlauf 4 50 mm – 37 mm Durchlauf 5 37 mm – 25 mm.
• 6. Ein 600 mm langes Metallstück wurde von der Mittellänge des 25 mm dicken Stücks mit der Schere abgetrennt, um später für das Eloxieren verwendet zu werden. Die beiden verbleibenden Stücke wurden zum erneuten Erwärmen in den Ofen zurückgelegt.
• 7. Der zweite Block erhielt dieselbe Behandlung, wie unter Positionen 5 und 6 angegeben. Ölkonzentrat wurde zu der Emulsion gegeben, um eine Konzentration von 7 Vol.-% zu erhalten.
• 8. Die beiden Stücke von jedem der Originalblöcke wurden dann nach dem erneuten Erwärmen mit einer Walzgeschwindigkeit von 18,3 m/Min unter Verwendung des folgenden nominellen Durchlaufschemas gewalzt: Durchlauf 6 25 mm bis 16 mm Durchlauf 7 16 mm bis 9,5 mm Durchlauf 8 9,5 mm bis 5 mm
• 9. Nach dem letzten Durchlauf wurden zwei 600 mm lange Stücke von jedem der gewalzten Stücke mit der Warmschere abgetrennt. Dieses Metall wurde zur späteren Untersuchung im Zustand wie gewalzt und eloxiert aufbewahrt. Der Abstand zwischen zwei in die Walze geritzten Markierungen wurde auf der Streifenoberfläche nach dem letzten Durchlauf zur Verwendung zur Berechnung des Voreilens des Walzguts verwendet.
• 10. Es wurden dann mittels Alkaliextraktion von einer bekannten Fläche zur späteren Messung des darauf abgesetzten Aluminiums Proben von der oberen Arbeitswalze genommen.

The following procedure was used with each oil in the rolling tests:

• 1. The AA5182 blocks were lightly peeled, degreased with methyl ethyl ketone, and heated to 454 ° C.
• 2. The mill rolls were washed in a dilute sodium hydroxide solution to remove the roll coating from any previous roll, and then rinsed. The rinse water was checked for residual alkali. A profilometer was used to measure surface roughness.
• 3. The rolls were preheated to 77 ° C using quartz tube heaters.
• 4. The cooling sprays were set to provide a flow rate of 200 L / min at a pressure of 6.9 · 10 ⁴ Newtons / m ² (10 psig) to the top spray head and 4.1 · 10 ⁵ Newton / m ² (60th gas) psig) on the lower head.
• 5. A 100 cm (4 inch) thick block of AA5182 received 5 passes of rolling using the following nominal flow chart. The rolling speed was 18.3 m / min. All runs were in the rolling direction from east to west. The nip settings were recorded for the first emulsion tested and then duplexed for the remaining emulsions. These settings were 1.27 mm below the nominal desired exit thickness for each pass. Nominal flow diagram: Run 1 100 mm - 83 mm Pass 2 83 mm - 65 mm Pass 3 65 mm - 50 mm Pass 4 50 mm - 37 mm Pass 5 37 mm - 25 mm.
• 6. A 600 mm long piece of metal was cut from the middle length of the 25 mm thick piece with the scissors to be used later for anodizing. The two remaining pieces were returned to the oven for reheating.
• 7. The second block received the same treatment as indicated under positions 5 and 6. Oil concentrate was added to the emulsion to obtain a concentration of 7% by volume.
• 8. The two pieces of each of the original blocks were then rolled after re-heating at a rolling rate of 18.3 m / min using the following nominal flow pattern: Run 6 25 mm to 16 mm pass 7 16 mm to 9.5 mm pass 8 9.5 mm to 5 mm
• 9. After the last pass, two 600 mm long pieces of each of the rolled pieces were cut with the warm shear. This metal was stored in a condition as rolled and anodized for later examination. The distance between two marks carved in the roll was used on the strip surface after the last pass for use in calculating the lead time of the rolled stock.
• 10. Samples were then taken from the upper work roll by alkali extraction from a known area for later measurement of the aluminum deposited thereon.

1 Fig. 4 is a graph showing the applied rolling force (in tons) exerted on an AA5182 aluminum alloy versus the number of passes.

As is seen with an average improvement of 2.2% the emulsion according to the invention across from reached the emulsion of the prior art.

2 Fig. 4 is a graph showing the net rolling force exerted (total force minus bearing losses in kW) versus the number of passes.

A An average improvement of 5.0% is achieved with the emulsion according to the invention opposite the Emulsion of the prior art achieved.

• 1. Es wurde drei Minuten unter Verwendung eines nicht-ätzenden alkalischen Reinigers gereinigt.
• 2. Es wurde zwei Mal gespült.
• 3. Salpetersäure-Desmut für zwei Minuten.
• 4. Es wurde zwei Mal gespült.
• 5. Es wurde in 15% Schwefelsäure bei 15 Volt 10 Minuten eloxiert.
• 6. Es wurde zwei Mal gespült.
• 7. Es wurde getrocknet.

A pilot anodizing line was used to anodize about 150 mm of the length of the 25 mm thick and 5 mm thick pieces (see point 6 above) to examine uptake and surface appearance. The procedure was:

• 1. It was cleaned for three minutes using a non-caustic alkaline cleaner.
• 2. It was rinsed twice.
• 3. Nitric Desmut for two minutes.
• 4. It was rinsed twice.
• 5. Anodize in 15% sulfuric acid at 15 volts for 10 minutes.
• 6. It was rinsed twice.
• 7. It was dried.

The Results show that the brightness and uniformity the surface texture an aluminum or aluminum alloy sheet after rolling with the emulsion according to the invention similar to the brightness that was obtained with the emulsion of the prior art.

• 1. Eine Plexiglasvorrichtung mit Dichtung wurde befestigt und an die Mitte der oberen Arbeitswalze gesiegelt. Diese Vorrichtung schloss ein Reservoir ein, das eine Fläche von 20,26 cm² auf der Walzenoberfläche bedeckte.
• 2. Fünfzehn Milliliter 1 N Natriumhydroxid wurde mit einer Spritze in das Reservoir gegeben, wo es mit der Aluminiumwalzbeschichtung auf der Walzoberfläche ungefähr 5 Minuten reagieren gelassen wurde.
• 3. Die alkalische Flüssigkeit wurde dann mittels der Spritze aus dem Reservoir extrahiert und in eine Probenflasche gegeben.
• 4. Zwei 15 ml-Spülungen mit entionisiertem Wasser wurden angewendet, mit einer Spritze extrahiert und in die Probenflasche gegeben.
• 5. Das Gesamtaluminium in der Probe wurde mittels ICP bestimmt.
• 6. Das Walzbeschichtungsgewicht wurde dann berechnet und als Milligramm Aluminium pro Quadratzentimeter Walzenoberfläche ausgedrückt.

A roller coating measurement was carried out as follows.

• 1. A plexiglass device with gasket was attached and sealed to the center of the upper work roll. This device included a reservoir that covered an area of 20.26 cm ² on the roller surface.
• 2. Fifteen milliliters of 1 N sodium hydroxide was syringed into the reservoir where it was allowed to react with the aluminum roller coating on the rolling surface for about 5 minutes.
• 3. The alkaline fluid was then extracted from the reservoir by syringe and placed in a vial.
• 4. Two 15 ml rinses of deionized water were applied, extracted with a syringe and placed in the sample bottle.
• 5. The total aluminum in the sample was determined by ICP.
• 6. The roll coating weight was then calculated and expressed as milligrams of aluminum per square centimeter of roll surface.

It It was found that the roller coating with the emulsion according to the invention was better than with the emulsion of the prior art.

Claims (15)

Hot rolling process for rolling aluminum and Aluminum alloy sheets comprising an effective amount of an oil-in-water emulsion is applied, which contains water and a water-soluble oil composition, the a base material oil and, based on the total weight of the water-soluble oil composition, 1 to 80 % By weight of di (2-ethylhexyl) adipate ester contains. A hot rolling method according to claim 1, wherein the water-soluble oil composition further, based on the total weight of the composition, 0.05 to 20 wt .-%, preferably 0.1 to 5 wt .-% of a non-ionic Contains surfactant, preferably an ethylene oxide addition polymer. Hot rolling method according to claim 1 or 2, wherein the water-soluble oil composition, based on the total weight of the composition, 3 to 30 wt .-% of the di (2-ethylhexyl) adipate ester. Hot rolling method according to one of claims 1 to 3, wherein the water-soluble oil composition further, based on the total weight of the composition, 1 to 30% by weight, preferably 5 to 20 wt .-% oleic acid. A hot rolling process according to any one of claims 1 to 4, wherein the water-soluble oil composition further contains a trialkanolamine (C ₂ to C ₄ ), preferably triethanolamine, in an amount such that all the bondable trialkanolamine is bound to a part of the oleic acid. Hot rolling method according to one of claims 1 to 5, in which the oil-in-water emulsion Water and 0.5 to 30%, preferably 1 to 15% (v / v) of the water-soluble oil composition contains. Hot rolling method according to one of claims 1 to 6, which is carried out in a roughing mill and in which the emulsion, based on the total volume of the emulsion, 2 to 4 vol .-% of the water-soluble oil composition contains. Hot rolling method according to one of claims 1 to 7, which is carried out in a finishing mill or compound rolling mill and in which the emulsion, based on the total volume of the emulsion, 5 to 7% by volume of the water-soluble oil composition contains. A water-soluble hot rolling oil composition for aluminum and aluminum alloys containing by weight, based on the total weight of the composition: - 0.1 to 0.5% trialkyl (C ₁ to C ₄ ) phenol; 0.5 to 4.0% trialkyl (C ₃ to C ₁₀ ) phosphate ester; 5 to 15% di (2-ethylhexyl) adipate ester; 5 to 15% organic fatty acid (C ₁₂ to C ₂₀ ); 0.5 to 2% of 5-carboxy-4-hexyl-2-cyclohexene-1-octanoic acid; - 1 to 3% alkylene (C ₂ - to C ₆ ) glycol; 0.3 to 1% ethoxylated alcohols (C ₅ to C ₁₄ , comprising 2 to 10 CH ₂ O groups); - 2 to 5% trialkanolamine (C ₂ to C ₄ ); The remainder being a mixture of naphthenic and paraffinic lubricating base oils. Water-soluble oil composition according to claim 9, wherein the base material oil has a viscosity between 7 and 150 cSt at 40 ° C, preferably between 20 and 50 cSt at 40 ° C. Process for the preparation of a water-soluble oil composition according to claim 9 or 10, wherein the base material and the others Ingredients with stirring or mixed with any mixing device. Oil-in-water emulsion, the water and 0.5 to 30%, preferably 1 to 15% (v / v) of the water-soluble oil composition according to claim Contains 9 or 10. Process for the preparation of an oil-in-water emulsion according to claim 12, in which the oil composition with stirring diluted in water becomes. Use of the water-soluble oil composition according to claim 9 or 10 for the preparation of emulsions by hot rolling for aluminum or aluminum alloy should be used. Use of the oil-in-water emulsion according to claim 12 in a hot rolling process.