JPS5852394A - Temper rolling oil for steel plate under high pressure - Google Patents

Abstract

PURPOSE:The titled oil which enables rolling of a steel plate without deformation and can reduce wear of rollers when used for temper rolling under high press., which is prepd. by adding at least one selected from an amphoteric surfactant and an alkyl phosphate to a common water-sol. temper rolling oil. CONSTITUTION:To a water-sol. temper rolling oil for a steel plate is added at least one selected from an amphoteric surfactant of MW >=150, such as N- lauryl-beta-aminopropionic acid, and an alkyl phosphate of MW 600-1,800, such as polyoxyethylenl nonylphenol phosphate, the content of which is adjusted to be 0.01-1.0% in use. A temper rolling oil which enables rolling of a steel plate without deformation, can reduce wear of rollers, and lowers unit cost of the roller even when used for severe temper rolling under high press., is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a skin pass rolling fluid used in a process in which a cold rolled steel plate is subjected to a skin pass rolling process under high pressure after annealing.

Generally, cold rolled and annealed steel sheets have a low profile.

In order to prevent the occurrence of cracks and stretcher strains, to impart the necessary mechanical properties, to improve and flatten the shape, and to finish the surface to a surface roughness suitable for the intended use, skin pass rolling must be carried out. No. This temper rolling is
In the case of tin plate blanks, it is generally done dry, but most other things are done wet, and except for special cases, water-soluble temper rolling agents are used. There is.

However, conventional water-soluble temper rolling agents have nitrites and amines (especially secondary amines) as their main components, and although they have excellent rust prevention properties, they cannot be used in the coexistence of nitrous acid and secondary amines. The theory that it produces nitrosamines and that it is a carcinogen has been proposed, and the situation has gradually become unusable. In particular, as long as nitrites coexist in the rolling agent, switching to other amines (primary and tertiary amines) carries the same risks, so technological development is progressing in the direction of not using nitrites at all. . Therefore, the concept of using only completely organic substances has been adopted, and rust prevention has been forced to be ensured mainly by amine salts made from a combination of organic acids and amines. The rolling reduction ratio of conventionally used temper rolling is usually 0.5 to 2.0%, and almost no lubricity is required during the rolling process. There were no problems with the rolling agent.

Recently, rolling of low-grade electrical steel sheets that exhibit electromagnetic properties under high pressure, or rolling of thin galvanized original sheets, has been carried out at a reduction rate of 3 to 10.
It is necessary to carry out skin pass rolling under high pressure, and furthermore, as tinplate blanks become wetter, severe temper rolling is now required.

If conventional temper rolling agents are used as they are for temper rolling under such high pressure, rolling may not be possible, or even if rolling is possible, the shape of the steel sheet will collapse, making it completely unusable. Further, even in the above-mentioned normal skin pass rolling process, there is a drawback that if the rolling agent has poor lubricity, the roll wear is severe and the roll unit consumption becomes high.

The present invention was made in view of the above-mentioned circumstances and to eliminate the drawbacks, and its purpose is to enable rolling even when used in severe temper rolling under high pressure, and to maintain the shape and shape of the steel sheet. The object of the present invention is to provide a temper rolling fluid that does not crumble, reduces roll wear, and lowers roll consumption.

The present invention, which was made to achieve this objective, adds at least one kind of an amphoteric surfactant with a molecular weight of 150 or more and an alkyl phosphate ester with a molecular weight of 600 to 1,800 to a normal water-soluble temper rolling agent, Temper rolling fluid whose content is adjusted to be in the range of 0.01 to 1.0% during use, and which does not lose its shape even under high rolling reduction of 3 to 10%. Moreover, the wear of the rolls is reduced and the rolls can be used satisfactorily.

To explain the temper rolling fluid of the present invention in more detail, the amphoteric surfactants added to the water-soluble temper rolling agent include:
For example, in the amino acid type, N-alkyl-β-aminozolopionic acid, N-7A/kyl-β-isinonopropionic acid, alkyl, diaminoethyldaricine, and in the betaine type, 2-undecyl-N-carboxymethyl- N-hydroxyethylimita 7" I7umbetaine, 2-undecyl-N-carboxyethyl-N-hydroxyethylimidazolium betaine, and their amine salts or alkali metal salts. Examples of alkyl phosphate esters include:
For example, polyoxyethylene nonylphenol phosphate, polyoxyethylene tunonylphenol phosphate, polyoxyethylene lauryl phosphate, polyoxyethylene dilauryl phosphate, polyoxyethylene oleyl phosphate, polyoxyethylene oleyl phosphate, polyoxyethylene stearyl phosphate. ester, polyoxyethylene stearyl phosphate,
and their amine salts or alkali metal salts.

The reason why these additives improve lubricity under high pressure is that amphoteric surfactants have carmexyl groups and alkyl phosphate esters have phosphoric acid groups, and both have excellent adsorption properties and are hydrophilic. This is because it has a relatively large molecular weight and can form a strong and thick adsorption film on the surface of the steel plate or roll. In addition, adsorption) also leads to improved anti-corrosion ability.

The molecular weight of the amphoteric surfactant to be added is 150 or more, preferably 200 or more, and if it is less than 150, sufficient repellency cannot be achieved in improving lubricity.

The molecular weight of the alkyl phosphate ester is 600 to 1,800, preferably 1,000 to 1,500. If the molecular weight is less than 600, sufficient volatilization effect will not be achieved to improve lubricity, and if it is more than 1,800, rust prevention will be reduced.

Further, the above-mentioned addition amount is 0. O1 to 1.0%, preferably 0.03
~0.3%. If it is less than 0.01%, it is not very effective in improving lubricity during rolling under high pressure, and even if it is added more than 1%, the lubricity is saturated and no further lubricity can be expected, so it is not economically advisable. do not have.

Traditionally, in temper rolling, the friction coefficient measured by a Soda pendulum friction tester has been used to express the lubricity, but in special cases where a high reduction rate (3 to 10%) is required, temper rolling It was found that rolling was more severe than conventional conditions and could not be explained by the friction coefficient measured by the pendulum friction tester. As a result of examining various testing machines, we found that high reduction rates require film strength and lubricity at extreme pressures, and that the Farex testing machine, which can apply large loads and perform measurements, is optimal for evaluating lubricity in such cases. It turned out to be.

That is, a material with a high load capacity in the Farex test has good rollability under high pressure in an actual machine.

The selection of the additive and the determination of its preferred molecular weight and concentration range are also based on the results of using a Farex tester.

By adding a predetermined amount of the amphoteric surfactant and alkyl phosphate ester as explained above to a normal water-soluble temper rolling agent, a rolling fluid with appropriate lubricity can be obtained. Even if a steel plate is rolled under high pressure, the shape will not collapse and good rolling can be achieved.

(2) Even in rolling under high pressure, wear of the rolling rolls can be significantly reduced.

(3) The performance requirements for the steel plate are satisfied. That is,
It does not have the same negative effect on rust prevention, stain resistance, direct paintability, chemical conversion, paintability, compatibility with rust preventive oil, etc.

It has various excellent effects such as.

Next, specific examples of the present invention will be described.

Examples: Table 1 Commercial agent A: Preparation containing 20% sodium nitrite, 2% jetanolamine, 4% triethanolamine, and 0.3% polyoxyalkylene alkyl ether nonionic surfactant. Commercially available aqueous solution for temper rolling B: A commercially available aqueous solution for temper rolling containing 10% paranitrobenzoic acid, 10% monoethanolamine, and 0.3% of a polyoxyalkylene alkyl ether nonionic surfactant・・・・・・10% of 1-hydroxybenzotriazole, monoethanolamine] (1° Aqueous solution for temper rolling containing 0.3% of polyoxyalkylene alkyl ether nonionic surfactant (above/g-cent) (All values are weight percentages.) The sample side stock solution shown in Table 1 was diluted to the required amount and used.

(1) Falex test method bottle 2'/4"φ Hfl 8
7V output: 96 HRO20 rotation speed:
29Orpm (2) Roll life, rolling property test method Rolling machine: Warb roll 465φ x 1370 made of silver copper Dull maximum speed 760 m / min Material: 5PCO, 5tx 1222W x 0 size
Constant roll life - Average rolling length of one work roll (normal rolling) Rollability - Relationship between rolling reduction and rolling load (3) Performance test method other than lubricity A plate temper rolled under the conditions of (2) above. The following tests were carried out using ■ Indoor exposure test alone and with anti-rust oil applied (9 days)■ Wet stack test alone and with anti-rust oil applied 40°OR
, H, 85% 30 days ■ Different color stain test Water drop spraying, staff, polyethylene film packaging, left indoor side ■ Direct paint acrylic paint 15μ,.

Goban Erichsen Taping ■ Degreasing Part 1 Hot water washing 60-65°C Soaking Part 2 Alkaline degreasing 60002% spray ■ Chemical/Paintable Degreasing → Zinc phosphate treatment → Electrodeposition coating → S, S, T.

400 hr 12- Table 3 Other performance test evaluations: ◎ Particularly good O Good △ Temporarily usable × Not usable The test material of the above example was used in an actual temper rolling mill, and its rolling performance was investigated. The results are as shown in Figure 1. Even at the same rolling reduction ratio between the test material of the present invention and the rolling agent of the commercial product, the rolling load of the rolling fluid of the present invention was significantly reduced. I can understand that. Furthermore, the life of the rolling rolls, that is, the work rolls, differs depending on the reduction in the rolling load, and the rolling fluid of the present invention can extend the service life by about 50 inches or more. This service life is tabulated in FIG.

Table 3 shows evaluations of general performances required for temper rolling agents or fluids, and none of the rolling fluids of the present invention are particularly inferior to conventional ones.

[Brief explanation of the drawing]

Figure 1 is a graph showing the rolling performance when the skin pass rolling fluid according to the present invention and the conventional skin pass rolling agent are actually used, and Figure 2 is a graph showing the roll life in actual use of the present invention and the conventional example. This is a graph showing a comparison. Continuation of Figure 1, Figure 2, Page 1 0 Inventor: Isao Manabe Inside the Tokushima Plant of Otsuka Kashoyaku Co., Ltd., 463 Kagasuno, Kawauchi-cho, Tokushima-shi Applicant: Nippon Steel Corporation 2-6-3 Otemachi, Chiyoda-ku, Tokyo ■Applicant: Otsuka Karate Yakuhin Co., Ltd. 10, Bungo-cho, Higashi-ku, Osaka City Procedural Amendment 1981 si, i1 To the Commissioner of the Patent Office (To the Patent Office Examiner)゛1. Display of the case Patent Application No. 150893 2, Title of the invention 3, Temper rolling fluid for high pressure reduction of steel plates 3, Person making the amendment Relationship to the case Applicant name (name) Address of Japan Hajiki Rising Co., Ltd.
1-1 Minami Aoyama-chome, Minato-ku, Tokyo (Shipping date) Showa
Year, Month, Day 6, Detailed Description of the Invention Subject to Amendment Z Contents of the Amendment (1), Specification of the Application, page 4, line 13, "isinodi-propionic acid" is changed to "iminodigropionic acid" correct. (2), same book, page 10, 2nd line, "pin" is corrected to "pin". (3), same book, same page, 3rd line, "%" is corrected to "96°". (4), same book, page 11, line 1, ``different color stain test'' is corrected to ``black stain test.'' (5), same book, same page, 2nd line, "staff" is corrected to "stack". that's all

Claims (1)

[Claims] At least one or more of an amphoteric surfactant with a molecular weight of 150 or more and an alkyl phosphate ester with a molecular weight of 600 to 1,800 is added to a water-soluble temper rolling agent for steel sheets, and when used, the content is 0.01 to 1. Temper rolling fluid for high-pressure steel plate adjusted to be in the range of .0.