WO2006085599A1

WO2006085599A1 - Two-pack-type seizing inhibitor for hot plastic working and process for producing seamless tube with the same

Info

Publication number: WO2006085599A1
Application number: PCT/JP2006/302280
Authority: WO
Inventors: Sumio Iida; Masami Imamura; Yuuji Tanaka; Kazumune Shimoda; Hirofumi Hori; Akira Motoki; Shizuo Mori
Original assignee: Sumitomo Metal Industries, Ltd.; Palace Chemical Co., Ltd.
Priority date: 2005-02-09
Filing date: 2006-02-09
Publication date: 2006-08-17
Also published as: EP1862530B1; BRPI0606156A2; EP1862530A4; CN101142304A; BRPI0606156B1; JP2006219556A; CN101142304B; JP4597695B2; EP1862530A1

Abstract

A seizing inhibitor for hot plastic working which is a two-pack type inhibitor consisting of: a first aqueous solution containing sodium silicate in an amount of 10-30 mass% in terms of anhydride amount based on the whole first aqueous solution; and a second aqueous solution containing one or more members selected from the group consisting of organic acids and water-soluble amine salts thereof, inorganic acids and water-soluble amine salts thereof, water-soluble amines, water-soluble alcohols, and water-soluble metal chlorides. The seizing inhibitor, after having been supplied by application to a disk roll type guide shoe, is held on the periphery of the disk roll type guide shoe without being washed off by cooling water for the rolls. Consequently, the seizing inhibitor does not adhere to the rolls, whereby a tube material can be perforated/rolled without slipping on the rolls.

Description

Anti-seizure agent for two-component hot plastic working and method for producing seamless pipe using the same

Technical field

TECHNICAL FIELD [0001] The present invention relates to a piercing and rolling mill provided with a disc roll type guide shoe, and in particular, a piercing and rolling mill provided with a horizontal type disc roll type guide shoe in which the rotation axis of the disc roll type guide shoe is perpendicular to the ground surface. In a seamless pipe piercing and rolling process using a two-part hot plastic working anti-seizure agent for preventing seizure between the guide shoe and the pipe, and this anti-seize agent The present invention relates to a method for producing a seamless pipe.

Background art

[0002] When hot seamless pipes are manufactured by the Mannesmann method, in the seamless pipe piercing and rolling process using a piercing and rolling machine, there is a seamless pipe material (hereinafter referred to as "pipe material"! It is well known that there is a problem of seizure flaws called “shuyu mark” in the pipe material due to contact between the guide shroud of the drilling and rolling machine.

[0003] For the purpose of solving this problem, for example, Patent Document 1 describes a mixed liquid paint in which sodium silicate (water glass) is added as a binder to metal oxide powder particles such as iron oxide. A piercing and rolling method of applying to a circumferential surface of a shoe is described. Patent Document 2 describes a lubricant for hot working comprising an aqueous solution containing iron oxide, sodium silicate, starch and xanthan gum.

[0004] Patent Document 3 discloses a film-forming solution mainly composed of a water-soluble polymer salt whose water-insoluble polymer acidity is adjusted in a guide shoe or the like, and a polymer formed from the film-forming solution. A hot rolling method is described in which a film is formed by applying a strong acid for precipitating the film component in the salt or a film forming auxiliary solution containing as its main component an aluminum salt thereof. Patent Document 1: Japanese Patent Laid-Open No. 60-21111

Patent Document 2: JP-A-11-35967

Patent Document 3: Japanese Patent Laid-Open No. 4288916

Disclosure of the invention Problems to be solved by the invention

[0005] However, the mixed liquid paint described in Patent Document 1 does not sufficiently adhere to the circumferential surface of the guide shoe, so it seems that seizure cannot be prevented.

[0006] Although the lubricant described in Patent Document 2 adheres sufficiently to the guide shoe, if the roll cooling water for preventing the wear of the roll is also applied to the guide shoe, the guide shoe goes round. The problem that the lubricant adhering to the surface flows down is assumed. In particular, in a piercing and rolling mill equipped with a horizontal disk roll type guide shoe, a large amount of water for cooling the nozzle located at the upper part is applied to the disk roll type guide shoe. The problem is that the lubricant adhering to the circumference of this guide shoe flows down.

[0007] For this reason, it is difficult to prevent seizure when piercing and rolling a pipe material made of a material that is very easy to seize, such as stainless steel. In order to prevent the lubricant from being washed away by the roll cooling water, when the roll cooling water is stopped during piercing and rolling, the lubricant adheres to the tool and induces slip between the roll and the pipe material. There was a problem. In addition, the film forming method described in Patent Document 3 seems to be unable to form a film necessary to prevent seizure.

[0008] Accordingly, the present invention is such that the anti-seizing agent adhering to the contact surface between the pipe material and the guide shoe is not caused to flow by the cooling water of the roll, and the anti-seizing agent adhering to the contact surface between the tube material and the guide shoe is attached to the roll. No anti-seizure agent for hot plastic working that solves problems such as preventing the occurrence of wrinkles without causing roll slip between the roll and pipe material, and a method for producing a seamless pipe using the same provide.

Means for solving the problem

[0009] Since the present invention is an anti-seizure agent used in hot rolling, it is water-soluble without fire hazard, and after being applied to the circumferential surface of the disk roll type guide shoe, it is water resistant. It is essential to have As a result of diligent research on anti-seizing agents that satisfy such requirements, the inventors have completed the following invention.

[0010] The first aspect of the present invention is a two-component anti-seizure agent for hot plastic working comprising a first aqueous solution and a second aqueous solution, wherein the first aqueous solution has a mass of the entire first aqueous solution. Standard (10 0-30% by weight of sodium silicate in terms of anhydride, and the second aqueous solution contains an organic acid and its water-soluble amine salt, an inorganic acid and its water-soluble amine salt, and a water-soluble amine. Is a seizure inhibitor for two-component hot plastic working, containing one or more selected from the group consisting of water-soluble alcohols and water-soluble metal salts

Here, the “two-component type” means an anti-seizure agent used in the following form. That is, when the anti-seizing agent is stored, the first aqueous solution and the second aqueous solution are not mixed with each other but stored separately. In use, the first aqueous solution and the second aqueous solution are applied on the guide shoe, respectively, and the first aqueous solution and the second aqueous solution are in contact with each other for the first time.

[0012] The first aqueous solution is based on the total mass of the first aqueous solution (100% by mass). Sodium silicate is 10 to 30% by mass in terms of anhydride, iron oxide is 10 to 60% by mass, starch-modified. The product may contain 0 to 5% by mass, and 0 to 1% by mass of a shear rate dependent viscosity reducing agent.

Here, the “shear rate-dependent viscosity reducing agent” is a general term for substances having the following properties. In other words, a solution in which this is dissolved in a solvent such as water reduces the viscosity of the solution when the shear force is applied while increasing the shear rate, and the viscosity of the solution recovers when the shear is removed. It has the property to do.

[0014] It is preferable that the shear rate-dependent viscosity reducing agent is chitansan gum.

[0015] A second aspect of the present invention relates to a method for manufacturing a seamless pipe in which a pipe material is pierced and rolled using a piercing and rolling mill equipped with a disc roll type guide shoe, and the first surface of the disc roll type guide shoe is provided with the first method. A first step of applying an aqueous solution, and a second step of applying a second aqueous solution to the peripheral surface of the disk roll type guide shoe to form a water-resistant coating on the peripheral surface. Based on the total mass of the first aqueous solution (100% by mass), sodium silicate is contained in an amount of 10 to 30% by mass in terms of anhydride, and the second aqueous solution contains an organic acid, its water-soluble amine salt, inorganic acid and A water-soluble amine salt, a water-soluble amine, a water-soluble alcohol, and a water-soluble metal salt. . [0016] In the method for producing a seamless pipe, the first aqueous solution is 10 to 30 masses of sodium silicate in terms of anhydride based on the mass of the entire first aqueous solution (100 mass%). %, Iron oxide 10 to 60% by mass, starch-modified product 0 to 5% by mass, and shear rate-dependent viscosity reducing agent 0 to 1% by mass. The shear rate-dependent viscosity reducing agent is preferably chitan sang gum.

The invention's effect

[0017] According to the anti-seize agent for a two-component hot plastic cake of the present invention, the anti-seize agent applied to the disc roll type guide shoe is a disc roll type which is a contact surface between the tube material and the guide shoe. It is supplied to the peripheral surface of the guide shoe and is held on the peripheral surface. In addition, the anti-seizure agent does not flow out and adhere to the roll because it is not poured into the cooling water of the roll. Further, according to the seamless pipe manufacturing method of the present invention using this anti-seizing agent, the pipe can be pierced and rolled without causing a slip between the roll and the pipe, and the surface without seizure flaws. Seamless pipes with excellent properties can be manufactured.

BEST MODE FOR CARRYING OUT THE INVENTION

[0018] The anti-seizure agent for two-component hot plastic working of the present invention comprises two components, a first aqueous solution and a second aqueous solution. Then, the first aqueous solution is first applied to the portion where the guide shoe and the pipe material come into contact, and then the second aqueous solution is applied to form a water-resistant film on this portion, thereby preventing seizure. To do.

[0019] The first aqueous solution contains 10 to 30% by mass of sodium silicate in terms of anhydride based on the mass of the entire first aqueous solution (100% by mass).

[0020] Sodium silicate is commercially available as water glass which binds to water and usually contains 45 to 70% by mass of water. Sodium silicate reacts with the second aqueous solution described below to cure and form a water-resistant coating.

[0021] The blending amount of sodium silicate is preferably 15 to 25% by mass based on the weight (100% by mass) of the entire first aqueous solution and 10 to 30% by mass in terms of anhydrous matter. Is more preferred. This is because if the amount of sodium silicate is too small, the curing reaction does not occur sufficiently and seizure cannot be prevented. On the other hand, if the amount of sodium silicate is too large, the excess sodium silicate results in excessive lubricity, lowering the coefficient of friction and causing roll slip. There is a risk of life.

[0022] The type of sodium silicate is not particularly limited. For example, common water glass No. 1 (Na Ο ·

2

2SiO), water glass No. 3 (Na 0-3SiO), water glass No. 4 (Na 0-4SiO)

2 2 2 2 2 is possible. Regardless of which sodium silicate is used, the anti-seizure agent for two-component hot plastic working of the present invention can exhibit a predetermined performance by setting the blending amount within the above range.

[0023] Further, the first aqueous solution contains 10 to 60% by mass of iron oxide and 0% of the starch modified product in addition to sodium silicate in the above-mentioned proportion based on the mass of the entire first aqueous solution (100% by mass). 5 weight ^_0/0, and the shear-rate dependent viscosity reducer contains 0-1 wt%, even.

[0024] Iron oxide is contained in order to exert a function as an anti-seizing agent. Since the anti-seizure agent also needs good storage stability and sprayability, the particle size of the acid pig iron is preferably 0.1 to 10 m. This is because if the particle size is too large, the storage stability is deteriorated. If the particle size is too small, seizure cannot be sufficiently prevented.

[0025] The compounding amount of iron oxide is preferably 10 to 60% by mass, more preferably 20 to 40% by mass, based on the mass of the entire first aqueous solution (100% by mass). This is because if the amount of iron oxide is too small, seizure cannot be sufficiently prevented. On the other hand, when the amount of iron oxide is too large, the density and viscosity become too high, and the sprayability deteriorates.

[0026] Depending on the type of iron oxide! Heteite (Fe 2 O 3), magnetite (Fe 2 O 3), vustite (F

2 3 3 4

Any of eO) may be used alone or in combination of two or more.

[0027] The modified starch has the property of being gelled at a high temperature (usually 80 ° C or higher). This prevents the first aqueous solution applied to the surface of the guide shoe that has become hot from flowing off. However, if the second aqueous solution can be applied before the first aqueous solution flows down, the starch-modified product is not necessarily required.

[0028] When a modified starch product is blended, the blending amount is preferably 5% by mass or less, based on the mass of the entire first aqueous solution (100% by mass). A range is more preferable. This is because if the amount of the starch-modified product is too large, the friction coefficient of the anti-seizing agent is reduced and roll slip may be induced. [0029] As the modified starch, for example, dextrin, oxidized starch, soluble starch, etherified starch, esterified starch and the like can be used, and these can be used alone or in admixture of two or more. it can.

[0030] As the shear rate-dependent viscosity reducing agent, it is preferable to use chitansan gum. Xantham Gum is a polysaccharide with a molecular weight of about 2 million consisting of 2 glucose, 2 mannose and 2 glucuronic acid, and is also called xanthan gum. Glucuronic acid is usually a salt of K, Na or Ca. It is. As the xanthan gum, a general commercial product can be used.

[0031] Xanthan gum has a thixotropic property in which molecules are entangled and become high viscosity when the solution is stationary, but the molecular entanglement is relaxed and becomes low viscosity when the solution is moved by applying a shearing force. Yes. Then, the viscosity of the first aqueous solution can be dynamically manipulated by the blending. That is, when the first aqueous solution is stored or is present in the piping of the spray device before being applied to the guide shoe, the first aqueous solution is in a stationary state and is It has good viscosity because of its viscosity.

[0032] On the other hand, when spray coating is performed on the surface of the guide shoe, the first aqueous solution moves with a shearing force. For this reason, the first aqueous solution has a low viscosity and a small viscous resistance force S in the pipe, which can be sprayed smoothly. When the sprayed first aqueous solution adheres to the surface of the guide shoe and becomes stationary, the viscosity immediately recovers and the guide shoe surface force does not flow down. However, if a method such as installing a stirring device in the storage tank or reducing the amount of water is adopted, a shear rate-dependent viscosity reducing agent such as chitansan gum may not be necessary.

[0033] When a shear rate-dependent viscosity reducing agent is blended, the blending amount is preferably 1% by mass or less, and more preferably in the range of 0.05 to 0.8% by mass. If the amount of the shear rate-dependent viscosity reducing agent is too large, the viscosity becomes too high to be sprayed properly.

[0034] In addition to the above-described components, the first aqueous solution contains a general dispersant or antifungal agent used in an aqueous solution containing solid particles such as a general anti-seizure agent. It can be added to the extent that the effect is not impaired. [0035] If the amount of water is extremely small, smooth spraying cannot be performed. Conversely, if the amount of water is extremely large, the first aqueous solution tends to flow off on the surface of the guide shoe. Therefore, the amount of water in the water glass combined with the water added separately is 24.0-84.5% by mass based on the mass of the first aqueous solution (100% by mass). It is preferably 40 to 70% by mass. In the present invention, it is preferable to adjust the amount of water in this way to optimize the viscosity of the first aqueous solution and ensure appropriate solvent properties.

[0036] The second aqueous solution is an organic acid and its water-soluble amine salt, inorganic acid and its water-soluble amine salt, water-soluble amine, water-soluble alcohol, and water-soluble metal chloride. Or it contains two or more.

[0037] As the organic acid, those having a total acid value of 500 mgKOHZg or more are preferably used. Specifically, monobasic acids such as formic acid, acetic acid and butyric acid, oxalic acid, malonic acid, maleic acid, and lingo It is preferable to use dibasic acids such as acid and tartaric acid, and tribasic acids such as citrate.

[0038] Here, "total acid value" means "neutralize all acidic components contained in sample lg" as described in JIS K 2501 (Petroleum products and lubricants-Neutralization evaluation test method). The number of milligrams (mg) of hydroxide power required for the process.

[0039] As the second aqueous solution, a liquid substance can be used as it is, or a solid substance can be used at a limit concentration at which it can be dissolved in water. However, in order to give fire resistance, it is desirable to use as a 5-30% by weight aqueous solution.

[0040] Examples of water-soluble amine salts of organic acids include organic acids that become water-soluble when converted to amine salts together with the amine salts of organic acids such as succinic acid, dartaric acid, adipic acid, phthalic acid, etc. And amine salts such as tribasic acids such as dibasic acid and trimellitic acid. The water-soluble amine salts of organic acids include monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, N- (j8-aminoethyl ) Amino alcohols such as ethanolamine, N-methylethanolamine and ammonia.

[0041] Examples of the inorganic acid include hydrochloric acid, sulfuric acid, phosphoric acid and the like. Use the liquid substance as it is as the second aqueous solution, or adjust the solid substance to a limit concentration that can be dissolved in water. Can also be used. However, in order to ensure safety for the human body, it is desirable to use it as a 1-20% by weight aqueous solution.

[0042] Examples of the water-soluble amine salt of an inorganic acid include a salt of an inorganic acid such as hydrochloric acid, sulfuric acid, phosphoric acid, boric acid, molybdic acid, tandastic acid, and an amine in the water-soluble amine salt of the organic acid. It can be done.

[0043] Examples of water-soluble amines include amino alcohols exemplified as the amines in the water-soluble amine salts of organic acids.

[0044] Examples of water-soluble alcohols include methyl alcohol, ethyl alcohol, isopropyl alcoholate, diethyleneglycolenoethylenoate, ethylene glycolate butenoreether, and the like.

[0045] Examples of the water-soluble metal salt include iron chloride, salt calcium, magnesium chloride, salt aluminum and the like. The water-soluble metal salt is preferably used as a 5 to 50% by weight aqueous solution from the viewpoint of safety and solubility.

[0046] The second aqueous solution may contain two or more of the above components! /. However, in such a case, it is preferable to use it as an aqueous solution with a total of 10 to 50% by mass of each component.

[0047] The method for preventing seizure of seamless pipes during piercing and rolling according to the present invention can be applied to piercing and rolling of a tube material using an inclined roll piercing and rolling mill equipped with a disc roll type guide shoe, and a disc roll type guide shoe. A first step of applying a first aqueous solution to the peripheral surface of the substrate, and a second step of applying a second aqueous solution to the peripheral surface of the scroll type guide shoe to form a water-resistant coating on the peripheral surface. .

[0048] The first aqueous solution used in the first step is the same as the first aqueous solution in the above-described seizure inhibitor for two-component hot plastic working, and the second water used in the second step. The solution is the same as the second aqueous solution in the above-described seizure inhibitor for two-component hot plastic working.

[0049] In the seamless pipe manufacturing method of the present invention, the sodium silicate in the first aqueous solution reacts with the second aqueous solution and gels, thereby forming a water-resistant coating on the peripheral surface of the disk roll type guide shoe. Is thought to be formed. As a result, the anti-seizing agent is held on the peripheral surface of the disc roll type guide shoe that does not flow into the cooling water of the roll. Seizure can be prevented, and seamless pipes with excellent surface properties can be manufactured without seizure.

[0050] In a piercing and rolling mill equipped with a horizontal disk roll type guide shoe whose guide shaft rotation axis is perpendicular to the ground, a large amount of roll cooling water for cooling the inclined roll is provided in the scroll type guide shoe. It will be hard. Therefore, the seizure prevention method of the present invention is applied to a piercing and rolling mill equipped with such a horizontal disk roll type guide shoe! Thus, it can be particularly preferably used.

[0051] The peripheral surface of the disc roll type guide shoe to which the first aqueous solution and the second aqueous solution are applied is the circumferential side surface of the disc-shaped disc roll type guide shoe. Normally, this circumferential side surface has a semicircular shape in longitudinal section along the shape of the pipe material to be pierced and rolled.

In [0052] First step, a first aqueous solution, 50～500GZm ^2, preferably applied to the circumferential surface of the disk-roll type guide shoe so as to 100~400gZ m ^2. Then, the second aqueous solution 30～300GZm ^2, preferably coated on the peripheral surface of the disk-roll type guide the shoes so that 50~200gZm ^2. This is because if the coating amount of the first aqueous solution is too small, the anti-seize component is insufficient and a sufficient anti-seize effect cannot be obtained. On the other hand, if the application amount of the first aqueous solution is too large, the second aqueous solution cannot sufficiently gel the first aqueous solution, and a good water-resistant film cannot be formed.

[0053] In the second step, it is preferable to apply the second liquid aqueous solution in an amount of about 1Z2 of the application amount of the first aqueous solution. This is because if the amount of the second aqueous solution applied is too small, the first aqueous solution cannot be sufficiently gelled. On the other hand, when the amount of the second aqueous solution applied is too large, the gelling effect is saturated, which is economically disadvantageous.

[0054] The method of applying the first aqueous solution and the second aqueous solution is not particularly limited, and means such as brush coating or spray coating can be used. However, in order to apply more uniformly to the peripheral surface of the disk roll type guide shoe, it is preferable to use a spray.

[0055] The seamless pipe material to which the seamless pipe manufacturing method of the present invention can be applied is not particularly limited to V. However, seizure of stainless steel or the like is likely to occur, and a remarkable effect is exerted on the material. . Example

[0056] Hereinafter, the present invention will be described in more detail with reference to production examples and examples. [0057] (Production example (1 1) to (1 6))

Iron oxide (chemical formula: Fe 2 O, purity: 98%, average particle size: 0.3 m), sodium silicate (chemicals)

twenty three

Formula: Na 0-2S10), modified starch (British gum 140, manufactured by Matsutani Chemical), Kissa

twenty two

Ntangham (Kelzan, manufactured by Kelco) and water were mixed in the proportions shown in Table 1 to obtain a first aqueous solution. In Table 1, each component is represented by mass% based on the entire first aqueous solution (100 mass%).

[0058] [Table 1]

(Table υ

[0059] (Production example (2-1) to (2-114))

A second aqueous solution containing each component shown in Table 2 at a predetermined ratio shown in Table 2 was used. In Table 2, each component is represented by mass% based on the entire second aqueous solution (100 mass%). In Production Example (2-14), a commercially available aqueous solution (manufactured by Daimei Chemical Industry Co., Ltd., Thai Pack (concentration: 10 to 11% by mass as Al Ο)) was used as it was.

twenty three

[0060] [Table 2]

(Table 2)

[0061] (Comparative Production Examples (11) to (17))

A first aqueous solution containing each component shown in Table 3 at a predetermined ratio shown in Table 3 was used. Here, the same iron oxide, sodium silicate, starch modified product, and chitansan gum as those used in Production Example (1-1) were used, and the isobutylene maleic acid copolymer ammonium salt had a weight average molecular weight of 80. , 000-90,000 isobutylene maleic acid copolymer neutralized with ammonia, polyacrylic acid sodium salt having a weight average molecular weight of about 500,000, carboxymethylcellulose The sodium salt having a weight average molecular weight of 000-15,000 was used. In Table 1, each component is represented by mass% based on the entire first aqueous solution (100 mass%). In Comparative Production Example (1-4), ammonium borate was dissolved by force heating at room temperature.

[0062] [Table 3]

(Table 3)

(Comparative production example (2-1) to (2-6))

A second aqueous solution containing each component shown in Table 4 at a predetermined ratio shown in Table 4 was used. In Table 4, each component is represented by mass% based on the entire second aqueous solution (100 mass%). Used in Comparative Production Example (2-1) and Comparative Production Example (2-2) Caproic acid and oleic acid are organic acids having a total acid value of 500 mgKOH / g or less.

[0064] [Table 4]

(Table 4)

[0065] (Example 1 to: L6)

A combination of the first aqueous solution and the second aqueous solution shown in Table 5 was used to evaluate the curability and seizure resistance as a two-component hot-working seizure inhibitor of the present invention. Table 5 shows the evaluation results.

[0066] (Comparative example:! -17)

In combination with the first aqueous solution and the second aqueous solution shown in Table 5, or only the first aqueous solution (Comparative Example 10 and Comparative Example 11), or only the second aqueous solution (Comparative Example 17), for hot plastic working As an anti-seizure agent, evaluation of curability and evaluation of seizure resistance were performed. The evaluation results are shown in Table 5.

[0067] (Evaluation method)

(1) Curability

The curability was evaluated by the following procedure. First, the first aqueous solution was applied to an approximately 60 g / m ² glass plate, and the glass plate coated with the first solution was immediately immersed in the second aqueous solution for 1 second. Then, take out the glass plate and wipe the surface of the glass plate with a waste cloth after 1 second. I took it. The obtained glass plate was evaluated according to the following criteria.

◯: All of the film formed on the glass plate remained.

Δ: Half or more of the film formed on the glass plate remained.

X: All the film formed on the glass plate was removed. Or no film was formed o

[0068] (2) Seizure resistance

The seizure resistance was evaluated by the following procedure. A schematic drawing showing the test configuration is shown in Fig. 1. First, a duplex stainless steel (25Cr-7Ni-3Mo steel) member 1 is heated to 1 000 ° C by a high-frequency coil 6, and an alloy pig iron-based roll material 2 is rotated at a rotation speed of 20 rpm while the nozzle is rotated. From 3 to the first aqueous solution and the nozzle 4 force, the second aqueous solution (in some cases, either the first aqueous solution or the second aqueous solution) was spray-coated on the surface of the roll material. Further, immediately before the surface of the roll material 2 was slid by the member 1, nozzle 5 force water was sprayed on the surface of the roll material 2. The member 1 was pressed against the surface of the sealing material 2 at 196N for 3 seconds (while the rolling material 2 was rotating). The appearance of the surface of the subsequent roll material 2 was evaluated according to the following criteria.

◯: Even when the surface of the roll material 2 was magnified 50 times and observed, there was no seizure. Δ: A force that was not recognized by seizure when the surface of the roll material 2 was observed with the naked eye.

X: Image sticking was observed by observing the surface of the roll material 2 with the naked eye.

[0069] [Table 5]

(Table 5)

Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. The scope of the claims and the overall power of the specification can be changed as appropriate without departing from the gist or philosophy of the invention which can be read, and the two liquids accompanying such a change. An anti-seizure agent for mold hot plastic working and a method for producing a seamless pipe should also be understood as being included in the technical scope of the present invention.

Industrial applicability

[0071] The anti-seizure agent for a two-component hot plastic cake of the present invention is a piercing and rolling mill provided with a disc roll type guide shoe, and in particular, the rotation axis of the disc roll type guide shoe is perpendicular to the ground surface. It can be used to prevent seizure between the guide shoe and the pipe in the seamless pipe piercing and rolling process using a piercing and rolling machine equipped with a horizontal disk roll type guide shoe.

Brief Description of Drawings

FIG. 1 is an explanatory view showing a test form for evaluating seizure resistance.

Explanation of symbols

[0073] 1 member

2 Roll material

3 nozzle (first aqueous solution)

4 nozzle (second aqueous solution)

5 Nozzle (water)

6 High frequency coil

Claims

The scope of the claims

[1] A two-component anti-seizure agent for hot plastic working comprising a first aqueous solution and a second aqueous solution,

The first aqueous solution contains 10 to 30% by mass of sodium silicate in terms of anhydride, with the total mass of the first aqueous solution being 100% by mass,

The second aqueous solution is selected from the group consisting of organic acids and water-soluble amine salts thereof, inorganic acids and water-soluble amine salts thereof, water-soluble amines, water-soluble alcohols, and water-soluble metal chlorides. Anti-seizure agent for two-component hot plastic working, containing more than seeds.

[2] In the first aqueous solution, the total mass of the first aqueous solution is 100% by mass, sodium silicate is 10-30% by mass in terms of anhydride, iron oxide is 10-60% by mass, and the starch-modified product is 0%. 2. The seizure inhibitor for two-component hot plastic working according to claim 1, comprising ˜5% by mass and 0 to 1% by mass of a shear rate dependent viscosity reducing agent.

[3] The anti-seizure agent for two-component hot plastic working according to claim 2, wherein the shear rate-dependent viscosity reducing agent is chitansan gum.

[4] In a seamless pipe manufacturing method of piercing and rolling a pipe using a piercing and rolling mill equipped with a disc roll type guide shoe, a first step of applying a first aqueous solution to the peripheral surface of the disc roll type guide shoe, and ,

A second step of applying a second aqueous solution to the peripheral surface of the disk roll type guide shoe and forming a water-resistant coating on the peripheral surface;

The second aqueous solution is selected from the group consisting of an organic acid and its water-soluble amine salt, an inorganic acid and its water-soluble amine salt, a water-soluble amine, a water-soluble alcohol, and a water-soluble metal chloride. Or the manufacturing method of the seamless pipe characterized by containing 2 or more types.

[5] In the first aqueous solution, the mass of the first aqueous solution is 100% by mass, sodium silicate is 10 to 30% by mass in terms of anhydride, iron oxide is 10 to 60% by mass, and the starch modified product is 0%. ~ 5 quality The method for producing a seamless pipe according to claim 4, comprising 0% by mass to 1% by mass of a shear rate-dependent viscosity reducing agent.

The method for producing a seamless pipe according to claim 5, wherein the shear rate dependent viscosity reducing agent is chitansan gum.