JP3462632B2 - Aqueous lubricant composition for plastic working of metal materials and surface treatment method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based lubricant composition made of lime soap for plastic working of iron-containing metallic materials and a surface treatment method thereof. In particular, it is preferably applied after forming a phosphate conversion coating on the surface of the iron-containing metal material.

[0002]

2. Description of the Related Art There is a remarkable increase in wire drawing speed in wire drawing, and high-speed wire drawing is performed at a speed of one thousand and several hundred m / min. It is said that this is due not only to advances in wire drawing equipment but also to advances in lubrication technology.
The lubricant plays a very important role. Lime soap is positioned as a pretreatment agent together with phosphate and borax in the lubricant treatment of wire drawing work, and is used as a lubricant carrier in the processing of steel materials with a relatively low carbon content (appropriate unevenness on the material surface). It is used together with a dry lubricant as a component that has the effect of carrying in the lubricant by giving the effect of preventing the contact between the tool and the work material (Tri).
Biology Metalworking J. A. S
hey, P385, ASM. (1983), "Lubricant Manual for Iron and Steel Wire Drawing" edited by Japan Society of Plastic Processing, Wire Drawing Technology Subcommittee, Lubricant Subcommittee, P18 (1982)). Lime soap is relatively inexpensive, is useful as a temporary rust preventive, and is used as a neutralizing agent for a pickling solution used in pretreatment. Generally, lime soap is easy to remove the residual film after extraction,
Since it shows a certain degree of lubricity even when used alone, it is used without a dry lubricant in the case of light processing. Its history goes back to the early Showa era, but it is still widely used due to its many advantages.

As mentioned above, lime soap is positioned as a carrier in the "lubricant manual for iron and steel wire drawing". However, when wire drawing of a difficult-to-process material is carried out, it is treated with phosphate and further treated with lime soap. Is done. In this case, lime soap is used not as a carrier but as a dry lubricant for imparting lubricity.

However, despite such widespread use, original lime soap is actually made by a method based on many years of experience in improving wire drawing. ("Lubricant manual for steel wire drawing", p19). The reason is that it is necessary to properly use the performance of the lubricant to be used depending on the purpose (lubrication, Nobuhiro Yoshida, 30, 709 (1985)), but there is still little universal knowledge about lime soap. It is considered to be a factor. Even the literatures in the past have not even defined a clear definition of lime soap, and only the manufacturing method and usage method are described.

For example, the manufacturing method is described in "Lubricant Manual for Iron and Steel Wire Drawing" edited by the Japan Plastic Working Society, Wire Drawing Technology Subcommittee. According to this, when an excess amount of quick lime (calcium oxide) is added to alkali soap and stirred in water, first, slaked lime (calcium hydroxide) is generated by the digestion (hydration) reaction of quick lime according to the reaction formula (1). It is believed that the heat generated at this time causes a metathesis reaction between slaked lime and soap according to the reaction formula (2), and the reaction of the reaction formula (2) occurs reversibly.

[0006]

[Chemical 1]

Therefore, the lime soap produced contains slaked lime, calcium soap and alkali produced, unreacted alkali soap which did not become calcium soap, and water. Of these, slaked lime and calcium soap, which are the main components, are adsorbed on the processed material in the lubricant composition and retain the lubricant (carrier effect).
Along with this, calcium soap has a role of reducing the friction coefficient during wire drawing (sliding effect), and slaked lime also has a role of preventing metal-to-metal contact during processing.

Lime soap varies depending on the purpose of use,
As a standard method in the "Lubricant Manual for Steel Wire Drawing", 5 to 10 parts by weight of alkaline soap of fatty acid and about 400 parts of water are added to 100 parts by weight of quick lime. It describes a method of adding ˜3 times the amount of water and allowing it to stand. The raw materials used are fatty acid alkali soap, quicklime, and water. Alkaline salts of sodium, potassium, etc. are used for the alkaline soap of fatty acid, but generally needle-shaped alkaline soap of beef fatty acid is often used. Quicklime is JIS-R9 as described in "Lubricant Manual for Steel Wire Drawing".
The quicklime special number described in 001 is used.

As a general lubricant treatment method, the wire rod is pickled with hydrochloric acid or sulfuric acid, chemically descaled, and then washed with water to divalent zinc ions, calcium ions, iron ions or the like. Contains oxidizing agents such as metal ions and phosphate ions, nitrate ions, nitrite ions, chlorate ions, p
A phosphate film is formed by immersing in a treatment liquid of H2 to H3 at a temperature of 50 to 80 ° C. After washing with water, the wire is immersed in lime soap having a temperature of 50 to 60 ° C. and a concentration of 5 to 30% by weight, and dried to form a lime soap film. At this time, the lime soap forms a lubricating film on the phosphate film,
It has the effect of neutralizing the surface of the wire that has been acidified by the phosphate treatment to enhance rust prevention. These treatments are soaked by a batch method.

A wire treated with a lubricating film is drawn into a predetermined wire diameter. At this time, the performance required for the lubricating film is the lubricating performance in wire drawing. The final lubrication performance of the lubricant for wire drawing in actual processing is judged by the die life ("Lubricant Manual for Steel Drawing", p62).
Specifically, the diameter of the drawn wire rod is measured at any time, and evaluated by the amount of work until the wire diameter exceeds a predetermined dimension.

The drawn wire rod is cut into an appropriate size, and is secondarily processed by a relatively light forging method called press forming to form a bearing or a bolt. In the forging process, a water-based emulsion type lubricating oil is used together to provide auxiliary lubricity and cool the tool.

However, the above-mentioned prior art has the following problems. Due to insufficient lubricity, the die life is short and expensive dies must be frequently replaced. When exchanging the dies, the wire drawing process must be interrupted, resulting in a decrease in production efficiency and a large loss. This phenomenon is caused by the fact that the die and the surface of the wire material come into direct contact during wire drawing, causing the die to wear and increasing the inner diameter of the die.

To compensate for this, methods such as increasing the concentration of lime soap and increasing the number of dipping treatments are performed. However, both methods are disadvantageous in terms of cost because the amount of lime soap adhered is considerably large, and the increased amount of adherence deteriorates the drying property after treatment and adversely affects the lubricity. Further, increasing the amount of adhesion and compensating for lubricity is an unfavorable factor in the forging process after wire drawing. That is, an excessive lubricating film may be peeled off during the forging process, and this may adhere to the tool surface, resulting in a defective product without being processed to a predetermined size.

A reactive soap film is used as a lubricant other than lime soap, and is used in combination with a phosphate film. This is also used for wire drawing like lime soap (see “Lubricant Manual for Iron and Steel Wire Drawing”, p2
6) When using this for continuous forging, a part of the lubricating film falls off as a result of the working, and as a result, the lost material adheres to the forging tool as a lump, and the predetermined amount is set after the working. The dimensional accuracy of will not be obtained.

Therefore, at present, no water-based lubricant for plastic working of iron-containing metal materials has been found to satisfy all the above required performances.

[0016]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and improves the lubrication performance of lime soap, and particularly when it is applied after the surface of a metal material is subjected to a phosphate film chemical conversion treatment. It is an object of the present invention to provide a method for supplying a lubricant composition having excellent lubricity and a surface treatment method.

[0017]

Means for Solving the Problems The inventors of the present invention have made extensive studies as to the means for solving the above-mentioned problems, and as a result, the amount of slaked lime, which is the main component of lime soap, and the ratio of the amount of alkali soap to the total amount of alkali soap and calcium soap. It has been newly found that the above problems can be solved by specifying the above, and the present invention has been completed.

That is, according to the present invention, in a water-based lubricant composition for plastic working of a metal material containing lime soap as an essential component, the composition of lime soap solid content excluding water and alkali is 60 to 80% by weight of slaked lime and calcium. Plastic working of a metal material, characterized in that the total amount of soap and alkali soap is 20 to 40% by weight, and the ratio of the amount of alkali soap to the total amount of alkali soap and calcium soap is 0.3 to 0.5. A water-based lubricant composition is provided.

Furthermore, according to the present invention, the surface of the metal material subjected to the phosphate chemical conversion treatment contains lime soap as an essential component, and the composition of the lime soap solid content excluding water and alkali is 60 to 80% by weight of slaked lime. , Water-based lubrication for plastic working of metal materials in which the total amount of calcium soap and alkali soap is 20 to 40% by weight, and the ratio of the amount of alkali soap to the total amount of alkali soap and calcium soap is 0.3 to 0.5 Provided is a method for surface-treating an aqueous lubricant composition for plastic working of a metal material, which comprises contacting with the agent composition and then heating and drying.

The structure of the present invention will be described in detail below. Metallic materials that are the subject of the present invention include iron, stainless steel, chrome steel,
They are molybdenum steel and titanium steel. The aqueous lubricant composition for plastic working of a metal material of the present invention contains lime soap as an essential component. Lime soap, which is an essential component of the composition of the present invention, is a mixture of slaked lime, calcium soap, alkali, alkali soap and water, and is mainly composed of slaked lime, calcium soap and alkali soap.

An important point in the present invention is that slaked lime has a composition of 6 as the solid content of lime soap excluding water and alkali.
0 to 80% by weight, the total amount of calcium soap and alkali soap is 20 to 40% by weight, and the ratio of the amount of alkali soap to the total amount of alkali soap and calcium soap is 0.3 to 0.5. Is.

If the total amount of calcium soap and alkali soap is less than 20%, the slipperiness is lowered, scratches may occur during wire drawing, and the die life may be shortened. On the other hand, if the total amount of calcium soap and alkali soap exceeds 40%, the dryness of the lubricating coating decreases, and moisture absorption easily occurs, so that the desired lubricity cannot be obtained in this case as well.

Further, if the total amount of calcium soap and alkali soap is increased, the viscosity will increase during production and it will be difficult to carry out sufficient stirring. As a result, the present invention cannot supply a lubricant composition of stable quality, which is one of the objects of the present invention, so it is not preferable to unnecessarily increase the total amount of soap. Increasing the amount of water at the time of production alleviates the increase in viscosity, but it is necessary to raise the temperature of the water used for production in advance, or the solid content of the produced lubricant composition becomes low, so transportation There are disadvantages such as wasting costs.

When the ratio of the amount of alkali soap to the total amount of alkali soap and calcium soap is less than 0.3, the lubricity is insufficient and scratches are likely to occur during wire drawing, resulting in extremely short die life. Further, it is extremely difficult to produce lime soap in which the ratio of the amount of alkali soap to the total amount of alkali soap and calcium soap exceeds 0.5 because of the following reasons. That is, the state in which the ratio exceeds 0.5 is a state in which an extremely large amount of alkaline soap that has not reacted with slaked lime is present. Such lime soap containing a large amount of unreacted alkaline soap is extremely unstable and is in a state where a reaction between slaked lime and alkali soap easily occurs. Therefore, even if a lime soap with a ratio exceeding 0.5 is temporarily produced, the reaction between slaked lime and alkali soap occurs gradually, and the ratio becomes 0.5.
It is highly possible that: For this reason, the upper limit of the ratio of the amount of alkali soap to the total amount of alkali soap and calcium soap is set to 0.5 or less. As described above, when the ratio of the amount of alkali soap to the total amount of alkali soap and calcium is 0.3 to 0.5, that is, most of the alkali soap reacts and is in an unreacted state rather than an extremely small amount. When the amount of alkali soap remains to some extent, the lubricity targeted by the present invention is better, and when the ratio is 0.3 to 0.5, the target sufficient lubricity in wire drawing is obtained. There is no adverse effect on the dimensional accuracy in the forging process.

Next, a method for producing the lubricating oil composition of the present invention will be described. In practice, the same manufacturing method as the conventional method may be used, but alkaline soap of 25 to 60% by weight of fatty acid with respect to the weight of quick lime and quick lime are added to water for production. At this time, the reaction temperature during the production needs to be higher than the melting temperature of the alkaline soap of the fatty acid used. That is, the alkali soap dissolves due to the rise in water temperature due to the digestion of quicklime, and the reaction of the reaction formula (2) proceeds, but the alkali soap of a fatty acid tends to have a higher dissolution temperature in water as the carbon number thereof increases. is there. Therefore, in order to adjust the temperature during the reaction to be equal to or higher than the melting temperature of the alkaline soap of the fatty acid used, it is necessary to consider the ratio of quick lime and water, or to raise the water temperature in advance by a heating device.
When the temperature at which the soap dissolves in water is reached, the metathesis reaction proceeds, calcium soap is produced, and lime soap is produced.

As the quicklime used in the lubricant composition of the present invention, it is preferable to use the quicklime special number (JIS-R9001) as described in the "Lubricant Manual for Iron and Steel Wire Drawing", and the alkaline soap of fatty acid is Carbon number 12-24
Sodium, potassium, ammonium salts composed of the above fatty acids or combinations thereof are preferred. The fatty acid used here may be a saturated or unsaturated fatty acid or a dimer or trimer thereof, and the composition thereof is not specified. Examples of saturated fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, glinoseric acid, and cerotic acid, and examples of unsaturated fatty acids include palmitoleic acid, oleic acid, linoleic acid, and linolenic acid.

If desired, a rust preventive additive may be added to the lubricant composition of the present invention. The addition of these improves the rustproofing property after the film formation. Generally, a rust layer generated on the surface of a metal material has a high friction coefficient and also reduces the adhesion of the lubricating film, so that it is necessary to suppress the generation of rust on the surface of the wire as much as possible. As the rust preventive additive used here, inorganic salts such as sodium tungstate, sodium molybdate, ammonium molybdate, sodium nitrite and borax, and amine salts such as triethanolamine and diethanolamine are effective. These additives may be added in the range of 0.1 to 2.0% by weight of the lime soap solution used, and the addition amount may be further increased especially when rust prevention is required.

In the lime soap film treatment of the wire rod, the wire rod is chemically descaled by pickling, and then the lime soap obtained by the process of the present invention is dispersed in water to a predetermined concentration, and the lime soap is subjected to a dipping treatment. It is preferable to form a film. Further, it is necessary to sufficiently dry the wire material before it is subjected to wire drawing.

When the lubricant composition of the present invention is used in combination with a phosphating treatment, the surface of the metal material is phosphating, then thoroughly washed with water and then treated with lime soap. As the phosphate treatment, iron phosphate-based, zinc phosphate-based, zinc calcium phosphate-based, etc. can be applied, and the type thereof is not specified. The weight of the phosphate film formed is not particularly limited, but usually 5 to 8 g /
m ² and in the case of high processing, it is preferable to process at 10 g / m ² or more.

The lime soap of the present invention has higher lubricity than conventional ones, and by applying this, the die life is further extended and the productivity of the wire rod is improved.

[0031]

EXAMPLES Next, the details of the present invention will be specifically described with reference to Examples and Comparative Examples. Table 1 shows the amounts of the constituent fatty acids and quicklime added to the soaps used in Examples and Comparative Examples. The method for evaluating the lubricity of the used lubricant composition and the method for measuring the composition in the solid content excluding water are as follows. The solid content was measured by measuring the weight of the residue when it was dried at 105 ° C. to a constant weight. The lubricity was evaluated by the rate of scratches caused by pulling out the pipe (empty drawing only on the outer surface) and the die life during wire drawing. Each evaluation method is as follows.

[Scratch Occurrence Rate] An annealed material of carbon steel pipe for machine structure (STKM13A (S) JIS-G3455) having an outer diameter of 25.4 mm, a wall thickness of 3.0 mmt and a length of 2000 mm has an outer diameter of 20 mm. Only the outer surface was subjected to a drawing process, and the scratches that occurred after the drawing were visually evaluated to evaluate the occurrence rate with respect to the entire circumference of the pipe. For example, 0% indicates that no scratch is observed, and 100% indicates that a scratch is generated on the entire surface. The pipe was pulled out using a chain type draw bench at a speed of 17.8 m / min.

The lubricating film treatment was carried out by immersing in 17.5% hydrochloric acid at room temperature for 10 minutes to perform descaling treatment, washing with water, and then immersing in a colloidal titanium-based surface conditioner prepalene Z, 3% at room temperature for 1 minute. Then, at 80 ° C., 10% zinc phosphate treatment liquid (Palbond 4 manufactured by Nippon Parkerizing Co., Ltd.)
21 WD) to form a phosphate film. After thoroughly washing with water, it was dipped in the lime soap of Example and Comparative Example adjusted to 60 ° C. and solid content of 5% for 3 minutes to obtain 110
It dried for 1 hour in the heating furnace of (degree C).

The treated material was immersed in a 5% chromic acid aqueous solution at 80 ° C., and the amounts of phosphate film and lime soap film were calculated from the amounts of zinc, iron and calcium in the stripping solution.
The phosphate coating amount was 4.2 g / m ² and the lime soap coating amount was about 5 g / m ² in each case.

[Die Life] A high carbon chromium bearing steel material (SUJ2 JIS-G4805) having a diameter of 5 mm was wire-drawn to a diameter of 4.7 mm, and the wire diameter was measured with a micrometer at any time. It is evaluated by the processing amount when the wire diameter changes by 0.005 mm, and the larger the processing amount, the better.
Lubrication film treatment is performed by immersing in 17.5% hydrochloric acid at room temperature for 7 minutes and washing with water four times to perform descaling treatment, and then 80 ° C, 10% concentration zinc calcium phosphate-based phosphate film treatment. A phosphate film was formed by immersing in a liquid (trade name: Palbond-3670X manufactured by Nippon Parkerizing Co., Ltd.), washed thoroughly with water, and then at 60 ° C., the solid content was adjusted to 5%. 3 for lime soap treatment liquid
It was immersed for a minute and dried in a heating furnace at 130 ° C. to form a film as a lubricating film. At this time, the phosphate coating had a coating weight of about 10 g / m ² , and the amount of lime soap coating was about 3 g / m ² in each case. The wire drawing was performed using a single-head type wire drawing machine at a wire drawing speed of 150 m / min.

[Calculation Method of Lime Soap] The same amount of ethanol water (50% by volume) is added to the produced lime soap, and the mixture is stirred at 50 ° C. for about 30 minutes. Alkaline soap is dissolved in ethanol and separated into an ethanol water-soluble component and an ethanol water-insoluble component using a filter paper. The components that are filtered at this time are alkali and alkaline soap, and the components that are not filtered are calcium soap and slaked lime. A suitable amount of hydrochloric acid is added to these separated products to decompose them with acid to obtain fatty acids, which are dissolved with diethyl ether, and the fatty acids contained in the ethanol water-soluble component and the ethanol water-insoluble component are quantified by weighing. did. Subsequently, the calcium content in the ethanol-water insoluble component and the sodium content in the soluble component were quantified by an atomic absorption method. Also,
The calcium soap content was calculated from the average molecular weight of the fatty acid composition in Table 1 and the fatty acid content in the ethanol insoluble component, and the sodium soap content was calculated from the fatty acid content in the ethanol insoluble component. The calcium content forming calcium soap was subtracted from the calcium obtained by atomic absorption to calculate the slaked lime content. The alkali content was calculated by the same method.

The constituent fatty acids are represented by the following abbreviations. C ₁₂ : lauric acid (saturated fatty acid) C ₁₄ : myristic acid (saturated fatty acid) C ₁₆ : palmitic acid (saturated fatty acid) C ₁₈ : stearic acid (saturated fatty acid) C _{16F 1} : palmitoleic acid (unsaturated fatty acid) C _{18F 1} : olein Acid (unsaturated fatty acid) C _18F2 : Linoleic acid (unsaturated fatty acid) C _18F3 : Linolenic acid (unsaturated fatty acid)

Example 1 300 parts by weight of water at 15 ° C. was put into a reaction tank, and 40 parts by weight of sodium soap having the composition shown in Table 1 was added thereto while vigorously stirring with a stirrer, and quick lime (JIS-R9001, special issue). 150 parts by weight was gradually added to prepare a lubricant composition. The lubricity of the obtained lime soap was evaluated.

For Examples 2 to 6 and Comparative Examples 1 to 5, lubricant compositions were prepared in the same manner as in Example 1 using the compositions shown in Table 1, and the same as in Example 1. An evaluation test was conducted. However, the wire drawing test was not carried out for Comparative Examples 2 and 3 in which the lubricity was obviously inferior in the evaluation by pulling out the pipe. Further, an attempt was made to produce a composition using the same alkali soap as in Example 1 with 150 parts of soap and 150 parts of quick lime, but the viscosity was remarkably increased, and the production was impossible. Table 2 shows the composition of lime soap containing no water in the produced lubricant composition, the measurement result of the amount of alkali soap with respect to the total amount of alkali soap and calcium soap, the measurement result of coating amount, and the lubricity test result. .

The following can be said from the evaluation results shown in Table 2. [Composition] The produced lubricant composition has a solid content of 40 to 5
It was 0%. The lubricant compositions of Examples 1 to 6 have a slaked lime content of 62.0 to
At 78.0% by weight, the amount of alkali soap is 0.30 to 0.48 with respect to the total amount of alkali soap and calcium soap.
Met. On the other hand, in the lubricant composition of Comparative Example 1, the amount of alkali soap was 0.1 with respect to the total amount of alkali soap and calcium soap.
Although it was 32, the content of slaked lime was 85.6% by weight, which was outside the appropriate range. Further, Comparative Examples 2 to 4 have a slaked lime content of 70.2 to 71.1.
Although the content was wt%, the amount of alkali soap was 0.02-0.23 with respect to the total amount of alkali soap and calcium soap.
It was beyond the proper range.

[Scratch Occurrence Rate] The lubricant compositions of Examples 1 to 6 all had a scratch occurrence rate of 20% or less. Also, the lower the content of slaked lime, the lower the incidence of scratches. On the other hand, the lubricant compositions of Comparative Examples 1 to 4 all had a scratch occurrence rate of 70% or more, and were clearly inferior in lubricity.

[Die Life] The lubricant compositions of Examples 1 to 6 were capable of drawing 4 tons or more. In Examples 1 to 3 and Examples 4 and 5, the die life was extended corresponding to the fact that the occurrence rate of scratches decreased as the slaked lime content was not small. The die life of Comparative Example 1 having a high scratch occurrence rate was only 1 ton. Further, the wire drawn by using the lubricant composition of the present invention was subjected to forging for 6 months, but the quality of the processed product was always constant and the dimensional accuracy was not adversely affected.

[0043]

EFFECTS OF THE INVENTION By using the water-based lubricant composition for plastic working of a metal material containing lime soap as an essential component of the present invention, the lubricity is improved, and the productivity of wire drawing can be improved. It was

[0044]

[Table 1]

[0045]

[Table 2]

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI C10M 105: 24) C10N 10:02 C10N 10:02 10:04 10:04 30:06 30:06 40:24 Z 40:24 50:02 50:02 80:00 80:00 (72) Inventor Tsutomu Sawada 1780 Nagaoka, Osamu Mining Co., Ltd., Santo-cho, Sakata-gun, Shiga Prefecture (56) Reference JP 63-69889 (JP, A) Kai 60-161492 (JP, A) JP 6-210341 (JP, A) JP 56-163047 (JP, A) JP 7-242893 (JP, A) JP 3340835 (JP, B2) Patent 3340836 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) C10M 173/00-173/02 C10M 103/06 C10M 105/24-105/26 C10M 125/10 C10M 129 / 28-129/46 C10N 10:02-10:04 C10N 30:06 C10N 40:24 C10N 50:02 C10N 80:00 C23C 22/60-22/67 B21C 9/00

Claims (2)

(57) [Claims] 1. Slaked lime, calcium soap, alkali, a
In a water-based lubricant composition for plastic working of a metal material containing lime soap as an essential component, which comprises a mixture of Lucari soap and water , carbon is added with respect to the total amount of constituent fatty acids in the lime soap.
It contains 40 to 57% by weight of saturated fatty acids of several 16 or more, the composition of lime soap solid content excluding water and alkali is 60 to 80% by weight of slaked lime, and the total amount of calcium soap and alkaline soap is 20 to 40% by weight. A water-based lubricant composition for plastic working of metal materials, wherein the ratio of the amount of alkali soap to the total amount of alkali soap and calcium soap is 0.3 to 0.5. 2. A surface of a metal material which has been subjected to a phosphate conversion treatment is treated with slaked lime, calcium soap, alkali or alkali stone.
Lime soap consisting of a mixture of soap and water is an essential component, and the number of carbon atoms is based on the total amount of constituent fatty acids in the lime soap.
The composition of lime soap solids containing 40 to 57% by weight of 16 or more saturated fatty acids and excluding water and alkali is slaked lime 6.
0 to 80% by weight, the total amount of calcium soap and alkali soap is 20 to 40% by weight, and the ratio of the amount of alkali soap to the total amount of alkali soap and calcium soap is 0.3 to 0.5 A metal material using the water-based lubricant composition for plastic working, which is brought into contact with the water-based lubricant composition for plastic working and then dried by heating.
Surface treatment method.