JPH09208984A - Cold rolling oil composition, cold rolling oil emulsion and cold rolling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable production of uniform rolled stocks with good luster by cold rolling process in high productivity. SOLUTION: This cold rolling oil composition comprises a mineral oil (base oil) with a viscosity of <=6 cps at 40 deg.C, 5-60wt.% of an ester of 1-18C aliphatic alcohol and 6-18C aliphatic carboxylic acid, and 1-20wt.% of a 2-18C glycol ether. The second objective emulsion is prepared by diluting this composition with water so as to be 5-20wt.% in concentration. The third objective cold rolling process uses this emulsion as lubricant.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cold rolling oil composition and a cold rolling oil emulsion used for rolling lubrication of ordinary steel, stainless steel, titanium, aluminum, copper and other metals, and the cold rolling oil. It relates to a cold rolling method using an emulsion. More specifically, the present invention relates to a cold rolling oil composition or the like which is particularly suitable for cold rolling stainless steel using a multi-high rolling mill such as a Zenzimir mill, a cluster mill, or a 6-high rolling mill.

[0002]

2. Description of the Related Art The surface gloss of stainless steel sheets is particularly important from the viewpoint of their application, and B is the most excellent depending on the degree of surface gloss.
A product is distinguished from a 2B product. Among these, the BA products are produced by bright annealing in a reducing atmosphere after cold rolling and then temper rolling, which gives very excellent surface gloss. It is greatly affected by the surface texture of the hot rolled product. In addition, the 2B product is annealed in a combustion atmosphere after cold rolling, the produced oxide scale is descaled by pickling, and then temper-rolled, so that the surface of the product is cold-rolled. Although it will be rougher than the state, a product with good surface gloss can be obtained by adjusting the annealing atmosphere and pickling conditions. Although the surface gloss is not as good as that of BA products, it also depends on the surface texture after cold rolling. To be done.

Compared with ordinary steel, stainless steel has a large degree of work hardening during cold rolling, is not easily cold-rolled, and from the viewpoint of surface gloss, a multistage rolling mill such as a Zenzimir mill is usually used. It has been cold rolled. On this occasion,
What is required of the rolling oil used is that the rolled stainless steel sheet has excellent surface gloss and has no uneven gloss or flaws.
It is capable of rolling under high speed and high pressure conditions and has high productivity. However, conventional rolling oils have not been able to sufficiently satisfy this requirement.

That is, conventionally, refined mineral oil is mainly used,
So-called water-insoluble cold rolling oil is often used, but when it is used, BA products with excellent surface gloss can be rolled, but high-speed rolling cannot be performed due to lack of rolling lubricity and cooling, and production It is limited in terms of sex and also causes a fire. On the other hand, from the viewpoint of lubricity, the viscosity is 40 ° C.
In the above, refined mineral oil of 20 cst or more is used, and natural oils and fats, emulsifiers, etc. are mixed with this, and when used, it is diluted with water and supplied as an emulsion, but it is extremely unsatisfactory in terms of surface gloss. , BA products cannot be used for rolling.

It is well known that the relationship between the lubrication mechanism and surface gloss in cold rolling is generally excellent when the contact portion between the plate and the roll is in the boundary lubrication state. This lubrication condition is
This can be considerably achieved by reducing the amount of oil introduced between the rolling work roll and the plate, that is, the roll bite inlet as a lubricating means to reduce the oil film thickness. However, in this case, since the oil film is thin, the oil film becomes non-uniform, uneven gloss occurs, and the surface quality is significantly impaired.

On the contrary, the present inventors have
5 to 40% by weight of an ester of an aliphatic monohydric alcohol having 18 carbon atoms and an aliphatic monocarboxylic acid having 6 to 18 carbon atoms, 8 carbon atoms
To 18 monohydric alcohol, 0.5 to 10% by weight of an emulsifier, and the balance of refined mineral oil as essential components, and a multistage cold rolling oil composition having a viscosity of 2 to 15 cst at 40 ° C. No. 22117. In this lubricating oil composition, a method opposite to the conventional lubricating means for obtaining gloss, which is conventionally performed, that is, the amount of oil introduced at the roll bite inlet is increased, while rolling oil, which is an oil film constituent, is added. The technical means of lowering the viscosity and reducing the friction coefficient was adopted. However, there is room for improvement in terms of glossiness, especially uneven gloss.

[0007]

DISCLOSURE OF THE INVENTION The present invention aims to realize production with high productivity by cold rolling of a rolled material having good luster and evenness, and a rolling oil composition suitable for that purpose, A rolling oil emulsion and a rolling method are provided.

[0008]

In order to solve the above-mentioned problems, the present inventors have further studied various factors that control the glossiness, especially the uneven glossiness. As a result, it has been found that stains generated during rolling, that is, a mixture of generated iron powder and a deteriorated product of rolling oil component (hereinafter referred to as scum) has a great influence on glossiness, particularly gloss unevenness. Therefore, the present inventors focused on the control of the scum,
The present invention has been completed by finding that uneven gloss can be eliminated by uniformly dissolving scum in the rolling oil component in the roll bite.

That is, the present invention is disclosed in Japanese Patent Publication No. 2211/1990.
Based on the technical means adopted in the invention described in Japanese Patent Publication No. 7, in addition, in order to enhance the solubility of the scum rolling oil, a low-viscosity mineral oil is used as a base oil and supplied as a high-concentration emulsion. Further, as a means for promoting uniform dissolution of scum, by containing glycol ether as a constituent component, a water-soluble cold rolling oil composition that can be sufficiently used for stainless rolling excellent in surface gloss, which is the subject of the present invention, is provided. We have reached the point where we can offer. The present invention provides the following technical means.

5 to 60 wt% of an ester of an aliphatic alcohol having 1 to 18 carbon atoms and an aliphatic carboxylic acid having 6 to 18 carbon atoms, with a mineral oil having a viscosity of 6 cst or less at 1.40 ° C. as a base oil. A cold rolling oil composition comprising 1 to 20 wt% of a glycol ether having 2 to 18 carbon atoms.

2. The cold rolling oil composition according to the above 1, wherein the viscosity at 2.40 ° C. is 8 cst or less.

3. A cold rolling oil emulsion obtained by diluting the cold rolling oil composition according to the above 1 or 2 into water so that the concentration becomes 5 to 20 wt%.

4. 4. A cold rolling method using the cold rolling oil emulsion according to the item 3 as a lubricant.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Rolling Oil Composition The rolling oil composition of the present invention has a viscosity at 40 ° C. of 6 cs.
A mineral oil of t or less is used as a base oil, and 5 to 60 wt% of an ester of an aliphatic alcohol having a carbon number of 1 to 18 and an aliphatic carboxylic acid having a carbon number of 6 to 18 as an essential component, and a carbon number of 2 to 2 are included. It contains 1 to 20 wt% of 18 glycol ethers. In a preferred embodiment, mineral oil having a viscosity at 40 ° C. of 2 to 5 cst is used as the base oil. With a composition using a mineral oil of 7 cst or more as a base oil, the gloss of the rolled material is likely to decrease during use. As the mineral oil, any of those conventionally used for rolling oil can be used, and a lubricating oil fraction of crude oil is refined by solvent refining, sulfuric acid treatment, hydrogenation refining, clay treatment, etc., alone or in any combination. Can be used.

When the content of the ester of the aliphatic alcohol having 1 to 18 carbon atoms and the aliphatic carboxylic acid having 6 to 18 carbon atoms is less than 5 wt%, rolling lubricity is insufficient and 60 wt.
If the composition exceeds 8%, the viscosity tends to increase, and if it exceeds 8 cst, for example, the surface gloss of the material to be rolled tends to decrease during use. If the aliphatic carboxylic acid having 5 or less carbon atoms has insufficient lubricity, and if the aliphatic alcohol or aliphatic carboxylic acid has 19 or more carbon atoms, the viscosity becomes high,
When used, the rolled material tends to lose its gloss.

Examples of the ester of an aliphatic alcohol having 1 to 18 carbon atoms and an aliphatic carboxylic acid having 6 to 18 carbon atoms include butyl palmitate, 2-ethylhexyl stearate, 2-ethylhexyl palmitate and lauryl. Undecylate, stearyl caprylate, methyl stearate, ethyl oleate, myristyl caprolate and the like can be used.

When the content of the glycol ether having 2 to 18 carbon atoms is less than 1 wt%, uneven gloss of the rolled material is likely to occur during use, while when it exceeds 20 wt%, the effect of suppressing uneven gloss is further increased. There is not much improvement and it is uneconomical. Glycol ethers having 19 or more carbon atoms increase the viscosity and tend to reduce the gloss of the material to be rolled during use.

Specific examples of the glycol ether having 2 to 18 carbon atoms include ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether and ethylene glycol monoisobutyl. Ether, diethylene glycol monoisobutyl ether, ethylene glycol monohexyl ether, diethylene glycol monohexyl ether, ethylene glycol mono-2-ethylhexyl ether, ethylene glycol monoallyl ether, ethylene glycol monophenyl ether, propylene glycol monophenyl ether, ethylene glycol monopropyl ether, Diethylene glycol Monopropyl ether, propylene glycol monopropyl ether, dipropylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, diethylene glycol monoisopropyl ether, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether,
Triethylene glycol monomethyl ether and polyethylene glycol monomethyl ether can be used.

In a preferred embodiment, a known emulsifier, a rust preventive additive, and an antioxidant are contained, if necessary, for emulsification in water. As the emulsifier, for example, commercially available nonionic surfactants, cationic surfactants,
Amphoteric surfactants can be used. As the rust preventive additive, alkanolamines such as triethanolamine and fatty acids such as oleic acid can be used. As the antioxidant, a phenolic antioxidant such as butylhydroxytoluene can be used.

In a preferred embodiment, the viscosity at 40 ° C. is 8 cst or less, preferably 2 to 7 wt%.
If the viscosity at 40 ° C. exceeds 8 cst, the gloss of the material to be rolled tends to decrease during use.

The rolling oil composition of the present invention can be particularly preferably used for cold rolling of stainless steels for BA and 2B products, especially stainless steel for BA products, using a multi-stage rolling mill.
It is not limited to rolling of stainless steel, but can be suitably used for rolling of steel and other special steels, and is not limited to rolling using a multi-stage rolling mill, and other types of rolling mills can be used. Can also be suitably used for rolling using.

Rolling Oil Emulsion The rolling oil composition of the present invention can be used as an emulsion diluted with water as a lubricant (cold rolling oil) for cold rolling of various metals, particularly stainless steel. In a preferred embodiment, in order to increase the amount of introduced oil at the entrance of the roll bite, a conventionally used emulsion concentration of 3 to 5 wt.
% To be used as a high-concentration emulsion of 8 to 15 wt%.

[0023]

EFFECTS OF THE INVENTION According to the rolling oil composition of the present invention, a rolled metal (rolled material), for example, a stainless steel plate, has excellent surface gloss, is free from uneven gloss and flaws, and has excellent cooling properties and lubricity. Because it is excellent, it can be rolled at high speed and high pressure,
The productivity of cold rolling can be increased.

[0024]

EXAMPLES In order to explain the present invention in more detail, examples and comparative examples will be specifically described.

Examples 1 to 6 and Comparative Examples A rolling oil composition having the composition shown in Table 1 was prepared, and for each composition, rolling lubricity, surface gloss of the material to be rolled during use, and A test for uneven gloss was performed. However, in each composition, a mineral oil having a viscosity at 40 ° C. of 2.3 cst (mineral oil A), a mineral oil having a viscosity at 40 ° C. of 4.0 cst (mineral oil B), or a mineral oil having a viscosity at 40 ° C. of 4.7 cst (mineral oil C Comparative Example) as a base oil, containing 5 wt% of triethanolamine as an antirust additive, 1 wt% of butylhydroxytoluene as an antioxidant, and 3 wt% of polyoxyethylene dioleate as an emulsifier.

[Rolling Lubricity Evaluation Test] Rollability was evaluated under the following test rolling conditions. The results are shown in FIG.

(1) Rolling mill: Small two-stage rolling mill [Roll: SUJ-2 (φ78 mm × 90 mm), Roll surface: Ra 0.05 μm (polished with # 1000 sandpaper for each test)] (2) Rolling speed: 100m / min, 200m / mi
n, 300 m / min (3) Rolling method: 5 pass rolling [5 pass rolling with a set load of 12 tons while applying constant tension (300 kgf for both inlet and outlet) for each pass, rolling load, glossiness (4) Rolled material: SUS430 2B material (t1.0 mm x
w50 mm × coil) (5) Sample: An emulsion obtained by diluting each composition with water to a concentration of 10 wt% was used as a lubricant, and the liquid temperature was 45 ° C.
It was used under the conditions of a liquid volume of 10 l and a spray volume of 2.3 l / min.

[Surface Gloss and Uneven Gloss Evaluation Test] (1) Surface Glossiness Five stainless-rolled coils each having a length of 50 cm were cut into 5 rolls under the same test rolling conditions as the rolling lubricity evaluation test, and cut into 5 sheets to obtain 1 sheet of steel. The angle of incidence of 20 was measured using a variable angle gloss meter (Model VG-1DP, Nippon Denshoku Industries Co., Ltd.)
The angle was measured at a reflection angle of 20 ° and the average value was shown. The results are shown in FIG.

(2) Gloss unevenness The surface of the steel sheet whose surface glossiness was measured was observed, and SZ-32
The degree of uneven streaks seen on the surface of the steel sheet at 300 m / min was set to 5, and the case of no uneven streaks was set to 1 and the visual evaluation was carried out in 5 stages. The results are shown in FIG.

[0030]

TABLE 1 Composition wt% Viscosity glycol ether cst base oil ester le (monovalent alcohol) 40 ° C. Example 1 mineral B butyl palmitate diethylene glycol isopropyl ether 46 30 15 6.0 Example 2 Mineral oil A 2-ethylhexyl Dipropylene glycol stearate monopropyl ether 73 8 10 3.6 Example 3 Mineral oil A 2-Ethylhexyl Diethylene glycol monopalmitate 2-Ethylhexyl ether 51 20 20 4.4 Example 4 Mineral oil A Lauryl diethylene glycol undecylate monobutyl ether 71 10 10 3. 9 example 5 mineral oil A stearyl diethylene caprylate monophenyl ether 46 40 5 7.0 example 6 mineral oil B methyl stearate dipropylene glycol Pro From ether 30 60 1 6.3 Comparative Example mineral oils C 2-ethylhexyl (lauryl alcohol) palmitate 54 27 10 8.1 1-3, according to the cold rolling oil composition of the present invention, equivalent to that of the conventional rolling oil It is possible to produce a rolled plate having the above-mentioned rollability, good surface gloss, and no uneven gloss.

[Brief description of drawings]

FIG. 1 is a graph showing the test results of rolling lubricity of Examples and Comparative Examples.

FIG. 2 is a graph showing the test results of surface gloss of Examples and Comparative Examples.

FIG. 3 is a graph showing the test results of uneven gloss in Examples and Comparative Examples.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display location C10M 105: 18) C10N 20:02 40:24 (72) Inventor Shigenori Takahata Shimaguchi, Hikari City, Yamaguchi Prefecture No. 3434 Nippon Steel Co., Ltd. in the Hikari Steel Works (72) Inventor Shuichi Inoue Shimada, Hikari City, Yamaguchi Prefecture Shimada No. 3434 No. 3 Nippon Steel Co., Ltd. in the Hikari Steel Works (72) Inventor Yoshiaki Iwasaki Nukata, Yamato-Koriyama City, Nara Prefecture 1021 Kitabemachi 1021 Daido Kagaku Kogyo Co., Ltd.Nara Production Technology Office (72) Inventor Tsuji Mizuta 1021 Kitabe Kitacho, Yamatokoriyama City, Nara Daibuka Kagaku Co. Ltd. Nara Production Technology Office (72) Inventor Yuji Sawajiri Nara 1021 Kitamachi Kitamachi, Yamatokoriyama City, Japan Daido Kagaku Kogyo Co., Ltd.

Claims (4)

[Claims] 1. A mineral oil having a viscosity of 6 cst or less at 40 ° C. as a base oil, and 5 to 60 wt% of an ester of an aliphatic alcohol having 1 to 18 carbon atoms and an aliphatic carboxylic acid having 6 to 18 carbon atoms. A cold rolling oil composition comprising 1 to 20 wt% of a glycol ether having 2 to 18 carbon atoms. 2. The cold rolling oil composition according to claim 1, which has a viscosity at 40 ° C. of 8 cst or less. 3. A cold rolling oil emulsion obtained by diluting the cold rolling oil composition according to claim 1 or 2 in water so that the concentration becomes 5 to 20 wt%. 4. A cold rolling method using the cold rolling oil emulsion according to claim 3 as a lubricant.