JP2010235791A - Rolling oil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling oil which hardly causes the adhesion of a metal material to a rolling roll even in severe lubricating conditions and little produces roll coating. <P>SOLUTION: The rolling oil having a dynamic viscosity of 75 to 150 mm<SP>2</SP>/s at 40°C is characterized by comprising the following components A and B, wherein the amount of the component A is ≥35 mass% based on the total amount of the rolling oil. The component A: a mineral oil having a dynamic viscosity of ≥300 mm<SP>2</SP>/s at 40°C, a viscosity index of ≤50, and a density of ≥0.89 at 15°C, and the component B: at least one of mineral oils and ester compounds which each has a dynamic viscosity of 10 to 40 mm<SP>2</SP>/s at 40°C and has a distillation final point of ≤600°C. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to rolling oil. Specifically, the present invention relates to a rolling oil used for rolling nonferrous metals such as magnesium alloy, aluminum, and alloys thereof.

In recent years, the demand for non-ferrous metal rolling has increased greatly. Examples of the non-ferrous metal include a magnesium alloy used for a notebook personal computer casing, aluminum used for a printing plate, and a copper alloy used for a connector.
In such non-ferrous metal rolling, since the product surface is particularly required to be uniform and beautiful, the requirements for rolling oil are becoming strict. For example, for non-ferrous metal rolling such as aluminum and its alloys, refined mineral oil is used as a base oil, and oil-based agents (fatty acids, fats, synthetic esters, etc.) and emulsifiers (fatty acid amine soaps, nonionic surfactants, etc.) The rolling oil which mix | blended various additives like this is proposed (for example, refer patent documents 1-4).

JP-A-6-25689 JP 2000-290678 A JP-A-8-170090 JP-A-11-343494

On the other hand, in the rolling process of a metal material, if the lubrication conditions become severe, the metal material tends to adhere. Specifically, material components are deposited on the surface of the rolling roll to produce a so-called roll coating. If the roll coating is remarkably generated, the rolled plate surface may be damaged.
However, even in the rolling oils described in Patent Documents 1 to 4, it is difficult to sufficiently suppress the generation of roll coating.

  Accordingly, an object of the present invention is to provide a rolling oil in which adhesion of a metal material to a rolling roll hardly occurs and the production of a roll coating is small even under severe lubrication conditions.

  The inventor of the present invention uses a mixture of a specific base oil having a high viscosity and a specific base oil having a low viscosity, so that the handling property at the time of use is good and the production of the roll coating product can be reduced. The headline and the present invention have been completed. That is, this invention provides the rolling oil as shown below.

(1) A rolling oil having a kinematic viscosity at 40 ° C. of 75 mm ² / s or more and 150 mm ² / s or less, comprising the following A component and B component, and the blending amount of the following A component is the rolling oil. A rolling oil characterized by being 35% by mass or more based on the total amount.
Component A: mineral oil having a kinematic viscosity at 40 ° C. of 300 mm ² / s or more, a viscosity index of 50 or less, and a density at 15 ° C. of 0.89 or more B component: a kinematic viscosity at 40 ° C. of 10 mm ² / s or more, 40 mm ² / S or less, the end point of distillation is 600 ° C. or less, and at least any one of mineral oil and ester compound (2) In the rolling oil according to (1) 1 above, the component A is a naphthenic mineral oil A rolling oil characterized by that.
(3) A rolling oil according to (1) or (2) described above, wherein the rolling oil is for hot rolling or warm rolling.
(4) A rolling oil according to any one of (1) to (3) above, which is for non-ferrous metal processing.
(5) A rolling oil, wherein the non-ferrous metal according to (4) is any one of aluminum, aluminum alloy, copper, copper alloy, magnesium alloy, titanium, titanium alloy, and Inconel.

  According to the rolling oil of the present invention, even when the lubrication conditions are severe, the metal material hardly adheres to the rolling roll, and the production of roll coating is small. Therefore, the lubricity at the time of rolling does not deteriorate, and rolling can be performed with a low rolling force.

Rolling oil of the invention, kinematic viscosity 75 mm ² / s or more at 40 ° C., or less 150 mm ² / s, blended with certain high viscosity oil (A component) and a predetermined low viscosity oil (B component) It is characterized by. Details will be described below.

(Component A)
A component mix | blended with the rolling oil of this invention is a mineral oil whose kinematic viscosity in 40 degreeC is 300 mm < ² > / s or more. If the kinematic viscosity at 40 ° C. is less than 300 mm ² / s, the lubricity during rolling may not be sufficiently exhibited. Accordingly, the kinematic viscosity is preferably 340 mm ² / s or more, more preferably 370 mm ² / s or more, and further preferably 400 mm ² / s or more. On the other hand, if the kinematic viscosity is too high, stains may occur on the surface of the rolled plate.
Therefore, the kinematic viscosity of the component A is preferably 800 mm ² / s or less, more preferably 600 mm ² / s or less, and further preferably 450 mm ² / s or less.

Moreover, the viscosity index of A component is 50 or less. When the viscosity index exceeds 50, the paraffin component increases, and the molecular weight increases for the viscosity. In that case, there is a possibility that stain occurs in the annealing treatment after rolling. There is also a risk of contaminating the annealing furnace. Therefore, the preferred viscosity index is 45 or less, more preferably 40 or less. On the other hand, if the viscosity index is too low, the viscosity is too low during rolling at a high temperature and the lubricity is poor, which is not preferable. Therefore, the viscosity index is preferably 15 or more, more preferably 20 or more.
Further, the density of the component A at 15 ° C. is 0.89 or more, preferably 0.9 or more. If the density is less than 0.89, the paraffin component increases, and the molecular weight increases for the viscosity, which is not preferable.

The above-mentioned component A is so-called mineral oil and can be obtained by various methods. For example, distillate obtained by atmospheric distillation of paraffinic crude oil, intermediate crude oil or naphthenic crude oil, or by distilling residual oil of atmospheric distillation under reduced pressure, or purify it according to a conventional method. For example, solvent refined oil, hydrogenated refined oil, dewaxed oil, and clay-treated oil can be used. What is necessary is just to prepare such mineral oil so that it may finally have each parameter mentioned above. In the rolling oil of this invention, 1 type of these mineral oils may be used as A component, and may be used in combination of 2 or more type.
Among the mineral oils described above, naphthenic mineral oil obtained from naphthenic base crude oil is particularly preferable. This is because naphthenic mineral oil has a low molecular weight and a low boiling point even with the same viscosity as other mineral oils, and can easily exert the effects of the present invention.

The blending amount of such component A is 35% by mass or more based on the total amount of rolling oil, preferably 40% by mass or more, more preferably 45% by mass or more, and further preferably 50% by mass or more. . When the blending amount of the component A is less than 35% by mass, the lubricity cannot be sufficiently ensured during rolling.

(B component)
B components blended into the rolling oil of the invention, kinematic viscosity at 40 ° C. is 10 mm ² / s or more, equal to or less than 40 mm ² / s, at least one kind of the mineral oil and ester compounds.
If the kinematic viscosity at 40 ° C. is less than 10 mm ² / s, the lubricity during rolling may not be exhibited sufficiently. Moreover, the evaporation loss accompanying use increases, and the composition tends to change. In addition, the flash point is lowered and a problem of smoke generation during use is likely to occur. On the other hand, if the kinematic viscosity exceeds 40 mm ² / s, it may be difficult to adjust the viscosity of the rolling oil of the present invention to 150 mm ² / s or less.
Therefore, the kinematic viscosity at 40 ° C. of the B component is preferably 12 mm ² / s or more and 35 mm ² / s or less.

Moreover, the mineral oil and ester compound which are B components have the end point of distillation of 600 degrees C or less. When a mineral oil or an ester compound whose end point of distillation exceeds 600 ° C. is used as a component of the rolling oil, stains may occur on the surface of the rolled sheet in the annealing treatment after rolling. Also, when rolling oil is rolled with water or as an emulsion at a temperature of 300 ° C. or higher, it becomes difficult to form a vapor film, and the emulsion or oil is partially contacted with the heated metal and the oil is spread. Unevenness is likely to occur. This spread unevenness becomes roll coating unevenness during rolling, which may be transferred to the rolled material and significantly deteriorate the product quality.
Therefore, the end point of distillation is preferably 600 ° C. or lower, and more preferably 550 ° C. or lower. However, the end point of distillation is preferably 400 ° C. or higher, more preferably 450 ° C. or higher, from the viewpoints of evaporation loss, flash point, and fuming associated with use. The end point of distillation may be measured according to JIS K2254 “Crude oil and petroleum products—distillation test method”.

  Mineral oil can be obtained by the same method as the A component among the above-mentioned B components. That is, what is necessary is just to prepare so that it may finally have each parameter mentioned above. In the rolling oil of the present invention, one kind of mineral oil as the B component may be used, or two or more kinds may be used in combination.

  The necessary properties of the ester compound as the component B are exactly the same as the mineral oil described above. Such an ester compound can be obtained, for example, by reacting an alcohol with a carboxylic acid.

  Preferred examples of the alcohol include aliphatic saturated alcohols having 1 to 18 carbon atoms or aliphatic unsaturated alcohols having 3 to 18 carbon atoms. These alcohols may be linear or branched, and may be monovalent or divalent or higher. Specific examples include methanol, ethanol, allyl alcohol, propanol, butanol, pentanol, hexanol, octanol, nonyl alcohol, isononyl alcohol, decanol, dodecanol, tetradecanol, hexadecanol, octadecanol, butenol, pen Examples include tenol, hexenol, octenol, decenol, dodecenol, tetradecenol, hexadecenol, octadecenol, ethylene glycol, glycerin, trimethylolpropane, and pentaerythritol.

  The carboxylic acid may be a monobasic acid, a dibasic acid or higher polybasic acid, and may be saturated or unsaturated. Further, it may be linear or branched. Examples of such carboxylic acids include octanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, hydroxyoctadecanoic acid, icosanoic acid, octenoic acid, decenoic acid, dodecenoic acid, tetradecenoic acid, hexadecenoic acid, Octadecenoic acid, hydroxyoctadecenoic acid, icosenoic acid, hexanedioic acid (adipic acid), octanedioic acid, decanedioic acid, dodecanedioic acid, tetradecanedioic acid, hexadecanedioic acid, octadecanedioic acid, icosanedioic acid, octenedioic acid , Decenedioic acid, dodecenedioic acid, tetradecenedioic acid, hexadecenedioic acid, octadecenedioic acid, icosenedioic acid, palmitic acid, stearic acid, isostearic acid, hydroxystearic acid, dimer acid, oleic acid, icosanoic acid, etc. Can do.

The component B of the present invention may be synthesized by selecting from the above-mentioned combinations an ester compound whose kinematic viscosity at 40 ° C. and the end point of distillation are within a predetermined range. Moreover, there is no restriction | limiting in the synthesis | combining method of an ester compound, For example, you may synthesize | combine by the transesterification method.
Such ester compounds may be commercially available. For example, diisononyl adipate and ditridecyl adipate are commercially available. In addition, you may mix | blend carboxylic acid and alcohol separately with respect to A component, and you may prepare the rolling oil of this invention by performing esterification after mixing | blending.

In addition, the ester compound used as the component B in the present invention is not limited to a synthetic product and may be a natural product as long as the above properties are satisfied. For example, natural fats and oils, hydrogenated products of natural fats and oils, transesterified products of natural fats and oils, hydrogenated products of transesterified products of natural fats and oils, and the like can be used as the B component.
Here, as natural fats and oils, various animal and vegetable fats and oils widely existing in the natural world can be used, but vegetable oils mainly composed of esters of fatty acids and glycerin, such as safflower oil, soybean oil, rapeseed oil, and palm oil. , Palm kernel oil, cottonseed oil, coconut oil, rice bran oil, sesame oil, castor oil, linseed oil, olive oil, tung oil, camellia oil, peanut oil, kapok oil, cacao oil, wood wax, sunflower oil, corn oil and the like.
The hydrotreated product of natural fats and oils is a so-called hydrogenated product of the aforementioned fats and oils in the presence of a suitable hydrogenation catalyst. Examples of hydrogenation catalysts include nickel catalysts, platinum group (Pt, Pd, Rh, Ru) catalysts, cobalt catalysts, chromium oxide catalysts, copper catalysts, osmium catalysts, iridium catalysts, molybdenum catalysts, etc. Can be mentioned. Further, it is also preferable to use a combination of two or more of the above catalysts as the hydrogenation catalyst.

The transesterified product of natural fats and oils is an ester obtained by subjecting a triglyceride constituting natural fats and oils to a transesterification reaction in the presence of a suitable ester synthesis catalyst. For example, a fatty acid ester having a predetermined kinematic viscosity is produced by transesterification of a lower alcohol and an oil and fat in the presence of the ester synthesis catalyst. Lower alcohol is used as an esterifying agent, and examples thereof include alcohols such as methanol, ethanol, propanol, butanol, and pentanol.
The hydrotreated product of the transesterified product of natural fats and oils is a product obtained by hydrogenating the transesterified product described above in the presence of an appropriate hydrogenation catalyst.
The above ester compounds may be used alone or in combination of two or more. Furthermore, in the present invention, the above-described mineral oil and ester compound may be mixed to form the B component.

The blending amount of such B component is preferably 10% by mass or more based on the total amount of rolling oil. If the blending amount of the component B (low viscosity component) is less than 10% by mass, it may be difficult to adjust the kinematic viscosity of the rolling oil at 40 ° C. to 150 mm ² / s or less.

The rolling oil of the present invention has a kinematic viscosity at 40 ° C. of 75 mm ² / s or more and 150 mm ² / s or less. Here, if the kinematic viscosity is less than 75 mm ² / s, the lubricity during rolling becomes insufficient and roll coating tends to occur. On the other hand, if the kinematic viscosity exceeds 150 mm ² / s, not only does the stain on the surface of the rolled plate easily occur during the annealing process after rolling, but the handling properties during use deteriorate, for example, it becomes difficult to pump. To do.

The above-described rolling oil of the present invention is suitably used for rolling various metal materials, particularly non-ferrous metal materials, by using water while spraying or as an emulsion. Examples of the non-ferrous metal material include aluminum, aluminum alloy, copper, copper alloy, magnesium alloy titanium, titanium alloy, and Inconel. Further, the rolling oil of the present invention is suitable for warm rolling and hot rolling because the metal material hardly adheres to the rolling roll even under severe lubrication conditions, and the production of roll coating is small. In addition, the lubricity during rolling does not decrease, rolling is possible under low pressure, and the surface of the metal material after rolling is smooth and uniform.
In addition, when using as an emulsion, it is preferable to dilute and use 10 to 100 times (volume ratio) with water. If the dilution factor is less than 10, rolling oil may be wasted from the viewpoint of performance. On the other hand, when the dilution ratio exceeds 100, the rollability becomes insufficient, and the surface of the metal material after rolling may not be smooth due to seizure during rolling.

  The rolling oil of the present invention exhibits an excellent effect even when no additive is blended, but various additives shown below may be blended as long as the effects of the present invention are not impaired. Specifically, a surfactant, an oily agent, an extreme pressure agent, an antiwear agent, an antioxidant, a rust inhibitor, a metal deactivator, an antifoaming agent, and the like can be appropriately blended and used.

  The surfactant is used when the rolling oil of the present invention is dispersed in water and used as an emulsion. Examples of the surfactant include an anionic surfactant, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant. Examples of the anionic surfactant include alkylbenzene sulfonate and alpha olefin sulfonate. Examples of the cationic surfactant include quaternary ammonium salts such as alkyltrimethylammonium salts and dialkyldimethylammonium salts. Examples of the nonionic surfactant include ethers such as polyoxyethylene alkyl ether and polyoxyethylene alkylphenyl ether. The blending amount is preferably selected in the range of 0.01 to 10% by mass based on the total amount of rolling oil.

  There is no restriction | limiting in particular as an oiliness agent, From what is conventionally used as an oiliness agent in rolling oil, arbitrary things can be selected suitably and can be used. Such oil agents include carboxylic acids such as stearic acid and oleic acid, or aliphatic saturated and unsaturated monoamines such as stearylamine and oleylamine, aliphatic saturated and unsaturated monocarboxylic acids such as lauric acid amide and oleic acid amide. Examples include acid amides. These may be used individually by 1 type and may be used in combination of 2 or more type. Further, the blending amount is preferably 0.01 to 10% by mass, more preferably 0.1 to 5% by mass, based on the total amount of rolling oil.

Examples of extreme pressure agents include sulfur compounds such as sulfurized olefins, dialkyl polysulfides, diarylalkyl polysulfides, diaryl polysulfides, phosphate esters, thiophosphate esters, phosphite esters, alkyl hydrogen phosphites, phosphate amine amine salts, Phosphorus compounds such as phosphoric ester amine salts are included. Further, the blending amount is preferably 0.01 to 10% by mass, more preferably 0.05 to 5% by mass, based on the total amount of rolling oil.
Examples of the antiwear agent include zinc dithiophosphate (ZnDTP), zinc dithiocarbamate (ZnDTC), molybdenum sulfide oxydithiophosphate (MoDTP), and molybdenum sulfide oxydithiocarbamate (MoDTC). Moreover, it is preferable to select the compounding quantity in the range of 0.1-5 mass% on the basis of the total amount of rolling oil.

Examples of the antioxidant include amines such as alkylated diphenylamine, phenyl-α-naphthylamine, alkylated α-naphthylamine, phenols such as 2,6-di-t-butyl-p-cresol, and 2,6 -Sulfur-based compounds such as di-t-butyl-4- [4,6-bis (octylthio) -1,3,5-triazin-2-ylamino] phenol and dilaurylthiodipropionate. Further, the blending amount is preferably 0.05 to 3% by mass, more preferably 0.2 to 2% by mass, based on the total amount of rolling oil.
Examples of the rust inhibitor include alkanolamines such as triethanolamine, petroleum sulfonates, alkylbenzene sulfonates, dinonylnaphthalene sulfonates, alkenyl succinic acid esters, and polyhydric alcohol esters. The blending amount of these rust preventives is preferably 0.01 to 1% by mass, more preferably 0.05 to 0.5% by mass based on the total amount of rolling oil in terms of blending effect. .

Examples of the metal deactivator include benzotriazole, tolyltriazole, thiadiazole, and imidazole compounds. Further, the blending amount is preferably 0.01 to 1% by mass, more preferably 0.01 to 0.5% by mass, based on the total amount of rolling oil, from the viewpoint of blending effect.
Examples of the antifoaming agent include silicone, fluorosilicol, and fluoroalkyl ether. The defoaming agent is preferably selected in the range of 0.005 to 0.1% by mass on the basis of the total amount of rolling oil from the viewpoint of balance between defoaming effect and economy.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
[Examples 1-8, Comparative Examples 1-7]
(1) Preparation of sample oil The rolling oil (sample oil) which has the composition shown in Table 1 and Table 2 was prepared, and the rolling experiment by a rolling mill was conducted.

Here, each component used for preparation of sample oil is as follows.
(1.1) Mineral oil 1 (component A): Naphthenic mineral oil, 40 ° C. viscosity: 400 mm ² / s, VI: 35, density at 15 ° C .: 0.927
(1.2) Mineral oil 2 (component A): Naphthenic mineral oil, 40 ° C. viscosity: 100 mm ² / s, VI: 43, density at 15 ° C .: 0.901
(1.3) Mineral oil 3 (component B): Naphthenic mineral oil, 40 ° C. viscosity: 28 mm ² / s, VI: 0, density at 15 ° C .: 0.907, end point of distillation: 502 ° C.

(1.4) Ester 1 (component B): diisononyl adipate, 40 ° C. viscosity: 11 mm ² / s, distillation end point: 455 ° C.
(1.5) Ester 2 (component B): ditridecyl adipate, 40 ° C. viscosity: 25 mm ² / s, distillation end point: 460 ° C.
(1.6) Ester 3: pentaerythritol tetraoleate, 40 ° C. viscosity: 65 mm ² / s, end point of distillation: 690 ° C.
(1.7) Ester 4: Natural fat / oil, 40 ° C. viscosity: 39 mm ² / s, distillation end point: 610 ° C.

(1.8) Oiliness agent: Oleic acid (1.9) Rust preventive agent: Triethanolamine (1.10) Surfactant: Higher alcohol alkylene oxide adduct (HLB: 12.5)

(2) Properties of each component and sample oil Measurement was performed as follows.
(2.1) Kinematic viscosity: Measured according to JIS K2283 “Crude oil and petroleum products—Kinematic viscosity test method”.
(2.2) Density: Measured according to JIS K2249 “Crude oil and petroleum products—Density test method”.
(2.3) Distillation property: Measured according to JIS K2254 “Crude oil and petroleum products—distillation test method”.

(3) Rolling experiment (3.1) Rolling material The following three types of alloy plates were used.
(3.1.1) Magnesium alloy (AZ31): 3 mm T x 50 mm W x 800 mm L
(3.1.2) Copper alloy (C2600): 2 mm T x 40 mm W x 800 mm L
(3.1.3) Aluminum alloy (A3004): 3mmT x 50mmW x 800mmL

(3.2) Rolling roll A SUJ-2 rolling roll (outside diameter 200 mmφ) was used with its surface polished with No. 240 polishing paper.

(4) Rolling method Each sample oil was dispersed in ion-exchanged water so that its concentration was 5% by mass to obtain an emulsion. Next, rolling was performed at a speed of 30 m / min while spraying the emulsion onto a rolling roll and a rolling material.
Here, the rolling conditions for the individual alloy plates are as follows.
(4.1) Magnesium alloy (AZ31)
Rolling start temperature: 350 ° C., number of rolled sheets: 30 sheets, target rolling reduction: 35%
(4.2) Copper alloy (C2600)
Rolling start temperature: 580 ° C., number of rolled sheets: 40 sheets, target reduction ratio: 30%
(4.3) Aluminum alloy (A3004)
Rolling start temperature: 450 ° C., number of rolled sheets: 50 sheets, target rolling reduction: 35%

(5) Evaluation method In the rolling experiment using each sample oil, the following characteristics were measured to evaluate the sample oil. The results are shown in Tables 1 and 2.
(5.1) Friction coefficient For the last 10 rolled sheets, the dynamic friction coefficient was measured from the Bland & Ford equation, and the average value was calculated.
(5.2) Roll coating amount The roll coating generated on the surface of the rolling roll after the rolling experiment was scraped with abrasive paper, dissolved in hydrochloric acid, and then the concentration of each dissolved metal was measured to determine the total amount of roll coating. . And the roll coating amount per unit area (mg / m < ² >) was computed based on the area of a contact part with a rolling material among rolling roll surfaces.
(5.3) Surface roughness of rolled plate The surface roughness (Ra, μm) of the rolled plate was measured for the last 10 rolled sheets, and the average value was calculated. The surface roughness was measured based on JIS B 0601-2001 (based on ISO04287-1997).

(6) Evaluation results As shown in Examples 1 to 8 in Table 1, since the sample oil for realizing the rolling oil of the present invention is blended with a predetermined amount of both the A component and the B component, the friction coefficient at the time of rolling. It can be seen that is small and excellent in lubricity. Furthermore, even when the number of rolled sheets increases, the occurrence of roll coating is very small, and it can be seen that the surface of the rolled metal material (rolled plate) is smooth. It should be noted that the magnesium alloy (Examples 1 to 4), the copper alloy (Example 5), and the aluminum alloys (Examples 6 to 8) have excellent effects in the same manner.
On the other hand, as shown in Table 2, the sample oils used in Comparative Examples 1 to 7 are either not blended with either the A component or the B component, or are either the A component or the B component. Is out of the scope of the present invention. Therefore, not only the friction coefficient at the time of rolling is high, but also the amount of roll coating after rolling is large, and as a result, the surface roughness of the rolled plate is also large.

  The rolling oil of the present invention can be suitably used for warm rolling and hot rolling of nonferrous metal materials.

Claims (5)

A rolling oil having a kinematic viscosity at 40 ° C. of 75 mm ² / s or more and 150 mm ² / s or less,
The following A and B components are blended,
The rolling oil characterized in that the blending amount of the following component A is 35% by mass or more based on the total amount of the rolling oil.
Component A: mineral oil having a kinematic viscosity at 40 ° C. of 300 mm ² / s or more, a viscosity index of 50 or less, and a density at 15 ° C. of 0.89 or more B component: a kinematic viscosity at 40 ° C. of 10 mm ² / s or more, 40 mm ² / S or less, and at least one of mineral oil and ester compound whose end point of distillation is 600 ° C. or less In the rolling oil according to claim 1,
The rolling oil, wherein the component A is a naphthenic mineral oil. The rolling oil according to claim 1 or 2 is for hot rolling or warm rolling. The rolling oil according to any one of claims 1 to 3 is for non-ferrous metal processing. The rolling oil according to claim 4, wherein the non-ferrous metal is aluminum, aluminum alloy, copper, copper alloy, magnesium alloy, titanium, titanium alloy, or Inconel.