EP2845655A1 - Procédé de fabrication d'un mandrin de perçage - Google Patents

Procédé de fabrication d'un mandrin de perçage Download PDF

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Publication number
EP2845655A1
EP2845655A1 EP13782357.1A EP13782357A EP2845655A1 EP 2845655 A1 EP2845655 A1 EP 2845655A1 EP 13782357 A EP13782357 A EP 13782357A EP 2845655 A1 EP2845655 A1 EP 2845655A1
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EP
European Patent Office
Prior art keywords
plug
arc
spraying
base metal
film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13782357.1A
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German (de)
English (en)
Other versions
EP2845655A4 (fr
EP2845655B1 (fr
Inventor
Yasuto Higashida
Yasuyoshi Hidaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel and Sumitomo Metal Corp
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Publication date
Application filed by Nippon Steel and Sumitomo Metal Corp filed Critical Nippon Steel and Sumitomo Metal Corp
Publication of EP2845655A1 publication Critical patent/EP2845655A1/fr
Publication of EP2845655A4 publication Critical patent/EP2845655A4/fr
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Publication of EP2845655B1 publication Critical patent/EP2845655B1/fr
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/131—Wire arc spraying

Definitions

  • the present invention relates to a method for producing a plug for piercing-rolling for use in a piercing-rolling mill (hereinafter, also referred to simply as a "piercer") that produces a seamless steel tube/pipe, particularly to a method for producing a plug for piercing-rolling having a film formed by performing arc-spraying of iron wires on a surface of a plug base metal.
  • a piercer also referred to simply as a "piercer”
  • a seamless steel tube/pipe is produced by the Mannesmann tube-making process.
  • the Mannesmann tube-making process includes the following steps:
  • a plug is used as a piercing tool.
  • This plug is mounted to a front end of a mandrel so as to pierce a billet heated at a high temperature of approximately 1200°C; thus the plug is subjected to a hostile environment with a high surficial pressure and a high temperature.
  • the plug includes a base metal made of hot working tool steel, and a film of oxide scale is formed on a surface of the base metal through a heating process in advance for the purpose of protection of the base metal, and thereafter the plug is used in the piercing-rolling.
  • the scale film on the surface of the plug insulates heat transfer from the billet to the base metal of the plug, and also prevents seizing between the billet and the plug.
  • Patent Literature 1 discloses such a plug having a film containing oxide and Fe formed on the surface of the plug base metal by performing arc-spraying of iron wires, instead of using the scale film formed through heat treatment. Since the plug having the arc-sprayed film has a film containing oxide and Fe on the surface of the plug, this plug is excellent in thermal insulation performance and seizing prevention, so that enhancement of the durability life of the plug is likely to be achieved.
  • Patent Literature 1 discloses an equipment system of producing (reproducing) a plug having an arc-sprayed film by forming the film containing oxide and Fe on a surface of a base metal of the plug in such a manner that, after shotblasting is applied onto the surface of the plug, molten material is sprayed from arc-spray guns onto the surface of the plug base metal while a turntable on which the plug is mounted is being rotated.
  • the spray guns are so disposed as to face a tip end portion, a front-half of the body portion, and a rear-half of the body portion of the surface of the plug base metal, and forms the arc-sprayed film by operating all the spray guns at the same time, thereby reducing time required for forming the film compared to the case of using a single spray gun to form the arc-sprayed film across the entire surface of the plug base metal, which results in enhancement of production efficiency of the plug.
  • Patent Literature 1 Japanese Patent No. 4279350
  • An object of the present invention which has been made in order to solve the problems according to the conventional art, is to provide a method for producing a plug for piercing-rolling having a film containing oxide and Fe formed on a surface of the plug base metal by performing arc-spraying of iron wires, and the method has the following features of:
  • a method for producing a plug for use in a piercing-rolling mill for producing a seamless steel tube/pipe comprises an arc-spraying step of melting iron wires, and spraying molten material thereof onto a surface of a base metal of a plug by use of an arc-spray gun, so as to form a film containing oxide and Fe on the surface of the base metal of the plug.
  • the surface of the base metal of the plug is divided into plural sections along an axial direction of the plug, and in turn, the arc-spraying is separately carried out in each of the plural sections while an intersection angle between the center line of a spraying stream from the arc-spray gun and the surface of the plug base metal is maintained within a range of 35 degrees to 90 degrees.
  • the plug has a bullet shape, and includes a body portion and a tip end portion, while the plural sections comprise a region of the body portion and the tip end portion.
  • the present inventors conducted various tests and intensive studies on forming a film containing Fe oxide and Fe on a surface of a plug base metal by performing arc-spraying of iron wires onto the surface of the plug base metal, focusing attention on the adhesiveness of the arc-sprayed film in particular. As a result, the present inventors have obtained the following findings.
  • the arc-spraying is a technique, for example, to use an arc-spray gun, and generates arcs between front ends of two spray wires serving as electrodes, so as to melt the spray wires, and at the same time, supply a compressed air jet or a nitrogen gas jet between the front ends of the spray wires so that the molten material is sprayed, thereby spraying the molten material onto a target object to form a film thereon.
  • a film formed on the surface of the plug base metal contains Fe oxide (iron oxide) and Fe.
  • the Fe oxide contained in the film results from molten material (molten iron) that is sprayed from the arc-spray gun, and is oxidized in the air before the molten material reaches the surface of the plug base metal.
  • Fe contained in the film results from the molten material that has reached the surface of the plug base metal before being oxidized in the air.
  • FIG. 1 is a schematic illustration showing the state of the arc-spraying conducted in the basic tests for investigating the adhesiveness of the arc-sprayed film.
  • molten material resulted from the iron wires is sprayed from the arc-spray gun 4 while the plug base metal 2 is being rotated around the central axis Pc of the plug 1, so as to form the film on the surface of the plug 1.
  • various films were formed by varying an intersection angle ⁇ defined by the center line Ac of a spraying stream from the arc-spray gun 4 and the surface of the base metal 2 of the plug 1.
  • a peel stress in the shear direction of the film (hereinafter referred to as "adhesiveness") was measured for each of the plugs 1 having different intersection angles, referred to as ⁇ .
  • the film adhesiveness for the plug in case of the intersection angle ⁇ of 90 degrees was defined as a reference "1”, and the evaluation of film adhesiveness was conducted based on the ratio of the film adhesiveness (adhesiveness ratio) of each plug having a different intersection angle ⁇ relative to this reference. The microscopic observation of the cross section of the film of each plug was also conducted.
  • FIG. 2 is an illustration showing the dependency on the intersection angle between the center line of the spraying stream of the arc-spray gun and the surface of the base metal of the plug as a result of the basic tests on the adhesiveness of the arc-sprayed film.
  • FIG. 3 is, as the result of the basic tests, an illustration showing microscopic observation photographs of the cross sections of plugs in case of different intersection angles, each defined by the center line of the spraying stream of the arc-spray gun and the surface of the base metal of the plug.
  • the adhesiveness ratio of the film depends on the intersection angle ⁇ between the center line of the spraying stream of the arc-spray gun and the surface of the base metal of the plug. Specifically, if the intersection angle ⁇ is smaller than 35 degrees, the adhesiveness ratio is apt to significantly decrease. To the contrary, if the intersection angle ⁇ is 60 degree or more, there is no sign of the decrease in the adhesiveness ratio.
  • the reason for the deterioration of the adhesiveness in case of a smaller intersection angle ⁇ is because the film might ununiformly adhere onto the surface of the plug base metal, which results in increase of the percentage of porosity in the film.
  • the arc-spraying is generally used in the repair of a tapping port of a metal refining vessel formed of a refractory material, or in coating on an internal surface of a cylinder bore of an engine.
  • the target of the arc-spraying is the internal surface of a cylindrical member, and is carried out such that a spray gun is inserted in a cylindrical member that is immobilized, so that the distance between the spray gun to the target surface on which the film is to be formed, that is, the spraying distance is approximately 50 mm, or approximately 150 mm at most, which is small.
  • intersection angle between the center line of the spraying stream of the spray gun and the target surface for the film formation it is not preferable to set the intersection angle between the center line of the spraying stream of the spray gun and the target surface for the film formation to be a large angle. If the intersection angle is large, molten material sprayed from the spray gun splashes back from the target surface for the film formation, and is then returned to the spray gun; therefore damages are caused to the spray gun, or the molten material splashed back from the target surface for the film formation is inadvertently re-sprayed onto the target surface for the film formation, which deteriorates the adhesiveness of the film; thus a larger intersection angle is not preferable in light of prevention of the above undesirable incidents.
  • the spraying distance from the spray gun to the surface of the plug base metal i.e., standoff distance from the surface is approximately 200 to 1000 mm, which is relatively large. Accordingly, even if the intersection angle is set to be large, the splash back of the molten material hardly occurs from the surface of the plug base metal.
  • the arc-spraying is carried out while the plug is being rotated, the molten material that should have splashed back from the surface of the plug base metal is tremendously flicked off by the rotation of the plug, so that the molten material is prevented from inadvertently adhering to the surface of the plug base metal.
  • intersection angle ⁇ between the center line of spraying stream from the arc-spray gun and the surface of the base metal of the plug within the range of 35 degrees to 90 degrees while the arc-spraying is being carried out to form the arc-sprayed film on the surface of the plug base metal. It is more preferable to set the intersection angle ⁇ within the range of 60 degrees to 90 degrees.
  • An example of a method for carrying out the arc-spraying with the intersection angle ⁇ within the preferable range may include the following method.
  • FIG. 4 is a schematic illustration explaining a conventional film forming method through the arc-spraying.
  • the plug 1 has a bullet shape
  • the film 3 is formed on the surface of the plug base metal 2 through the arc-spraying in such a manner that the spray gun 4 is reciprocatingly moved from the rear end to the tip end along the surface of the plug base metal 2 while the plug base metal 2 is being rotated about the central axis P c of the plug 1.
  • the film 3 is formed from the tip end portion 1a, the front-half 1ba of the body portion 1b, to the rear-half 1bb of the body portion 1b (reeling portion) across the entire surface of the plug 1.
  • the spray gun 4 is mounted to an articulated arm that is operated by programming, and the motion and posture of the spray gun 4 is controlled by the programming.
  • FIG. 5 is a schematic illustration showing the reason why enhancement of the durability life of the plug cannot be achieved when the arc-sprayed film is formed by the conventional method shown in FIG. 4 .
  • the spray gun 4 is configured to move in a wide range from the rear end to the tip end of the surface of the plug base metal 2, and thus it is extremely complicated to control the motion and the posture of the spray gun 4. Consequently, as shown in FIG.
  • the intersection angle ⁇ between the center line Ac of spraying stream from the arc-spray gun 4 and the surface of the plug base metal 2 may be deviated out of the above preferable range (encircled portion in FIG. 5 ). Due to this, the adhesiveness of the film becomes partially reduced.
  • the durability life of the plug can be significantly enhanced by employing a method that divides the surface of the plug base metal into plural sections along an axial direction of the plug, and in turn, separately forms part of the arc-sprayed film in each section.
  • Patent Literature 1 describes a technique of forming the arc-sprayed film such that disposes spray guns are disposed opposite to the tip end portion, the front-half of the body portion, and the rear-half of the body portion of the plug, respectively, and operates all the spray guns to form the arc-sprayed film at the same time in order to reduce time required for the film formation through the arc-spraying. Even in this technique, the durability life of the plug cannot also be enhanced as much as expected, similarly to the conventional method shown in FIG. 4 , and the reason for this is not identified yet.
  • FIG. 6 is a schematic illustration showing the steps of the film formation through the arc-spraying in the production method of the plug according to the first embodiment of the present invention
  • FIG. 6(a) shows the state of forming the film at the body portion of the plug as step 1
  • FIG. 6(b) shows the state of forming the film at the tip end portion of the plug as step 2.
  • the method of the first embodiment shown in this illustration is based on the configuration of the conventional method shown in FIG. 4 , and a duplicate description will be omitted when appropriate.
  • the plug 1 has a bullet shape, and the film 3 is formed on the surface of the plug base metal 2 through the arc-spraying while the plug base metal 2 set on a turntable (not shown) or the like is being rotated about the central axis P c of the plug 1.
  • the surface of the plug base metal 2 is divided into two sections along an axial direction of the plug 1.
  • FIG. 6 shows an example of the plug 1 divided into the tip end portion 1a and the body portion 1b.
  • the body portion 1b is a portion of 80 to 98 % of the overall length from the rear end (lower end in the illustration) of the plug 1 in an axial direction (vertical direction in the illustration) of the plug 1.
  • step 1 as shown in FIG. 6(a) , the arc-spraying is carried out such that the spray gun 4 is disposed opposite to a region of the body portion 1b of the plug among the surface of the plug base metal 2, and is reciprocatingly moved along the surface of this region only.
  • the film 3 is formed on the body portion 1b other than the tip end portion 1a on the surface of the plug base metal 2.
  • step 2 the arc-spraying is carried out such that the spray gun 4 is disposed opposite to a region of the tip end portion 1a of the plug among the surface of the plug base metal 2, and is reciprocatingly moved for a short distance along the surface of this region only.
  • the film 3 is formed at the tip end portion 1a on the surface of the plug base metal 2. Accordingly, the film 3 is formed across the entire surface of the plug 1.
  • the motion and the posture of the spray gun 4 are controlled in such a manner that the intersection angle ⁇ between the center line A c of spraying stream from the spray gun 4 and the surface of the plug base metal 2 is within the preferable range that is found based on the result of the above described basic tests, that is, within the range of 35 degrees to 90 degrees, more preferably of 60 degrees to 90 degrees.
  • the surface of the plug base metal 2 is divided into two sections (the tip end portion 1a and the body portion 1b) in an axial direction of the plug 1, and in turn, the arc-spraying is carried out separately in each of two sections with the intersection angle ⁇ between the center line A c of spraying stream from the spray gun 4 and the surface of the plug base metal 2 maintained within the preferable range, so as to form the film 3 through the arc-spraying, thereby producing the plug having the arc-sprayed film with firm adhesiveness between the plug base metal and the film as well as significantly enhanced durability life of the plug.
  • FIG. 7 is a schematic illustration showing the steps of the film formation through the arc-spraying in the production method of the plug according to the second embodiment of the present invention; and FIG. 7(a) shows the state of forming the film at the rear-half of the body portion of the plug as step 1, FIG. 7(b) shows the state of forming the film at the front-half of the body portion of the plug as step 2, and FIG. 7(c) shows the state of forming the film at the tip end of the plug as step 3.
  • the method of the second embodiment is based on the configuration of the above first embodiment, while divided sections of the surface of the plug base metal 2 are further increased. In the second embodiment, the surface of the plug base metal 2 is divided into three sections.
  • FIG. 7 shows an example of the plug 1 divided into the tip end portion 1a, the front-half 1ba of the body portion 1b, and the rear-half 1bb of the body portion 1b of the plug 1.
  • step 1 in step 1 as shown in FIG. 7(a) , the arc-spraying is carried out such that the spray gun 4 is disposed opposite to the region of the rear-half 1bb of the body portion 1b of the plug among the surface of the plug base metal 2.
  • the film 3 is formed on the rear-half 1bb of the body portion other than those of the tip end portion 1a and the front-half 1ba of the body portion on the surface of the plug base metal 2.
  • step 2 as shown in FIG. 7(b) , the arc-spraying is carried out such that the spray gun 4 is disposed opposite to the region of the front-half 1ba of the body portion 1b of the plug among the surface of the plug base metal 2.
  • the film 3 is formed on the front-half 1ba of the body portion on the surface of the plug base metal 2.
  • step 3 as shown in FIG. 7(c) , the arc-spraying is carried out such that the spray gun 4 is disposed opposite to the region of the tip end portion 1a of the plug among the surface of the plug base metal 2.
  • the film 3 is formed on the tip end portion 1a on the surface of the plug base metal 2. Accordingly, the film 3 is formed across the entire surface of the plug 1.
  • the motion and the posture of the spray gun 4 are controlled to carry out the arc-spraying in such a manner that the intersection angle ⁇ between the center line A c of spraying stream from the spray gun 4 and the surface of the plug base metal 2 is within the preferable range that is found based on the above basic tests.
  • the method of the second embodiment can also achieve similar effects as those by the method of the first embodiment.
  • the number of the divided sections of the surface of the plug base metal may be any number more than one, and the number of the divided sections may be determined depending on a taper angle and/or the curvature of the surface of the plug.
  • the plug provided by the above method of each embodiment can be reproduced after its durability life is expired through repetitive piercing-rolling by re-forming the arc-spayed film on the surface of the plug using the same method.
  • a jet air injection or the shotblasting is preferably applied onto the surface of the plug, so as to remove the film remaining on the surface of the plug in as-is condition after the repetitive piercing-rolling.
  • a shield plate may be disposed so as to cover a region other than a target region for the film formation when the arc-spraying is applied to each section of the divided surface of the base metal.
  • the shield plate is so disposed as to cover the tip end portion at the time of applying the arc-spraying to the body portion, and the shield plate is so disposed as to cover the body portion at the time of applying the arc-spraying to the tip end portion.
  • the shield plate is so disposed as to cover the front-half of the body portion and the tip end portion at the time of applying the arc-spraying to the rear-half of the body portion.
  • the shield plate is so disposed as to cover the rear-half of the body portion and the tip end portion at the time of applying the arc-spraying to the front-half of the body portion, and the shield plate is so disposed as to cover the front-half of the body portion and the rear-half of the body portion at the time of applying the arc-spraying to the tip end portion of the plug.
  • This is to prevent adhesion of the molten material sprayed from the sprayer onto an unexpected region at an unfavorable intersection angle, thereby preventing deterioration of the adhesiveness between the plug base metal and the film.
  • the shield plate may be so disposed as to cover at least a region where no sprayed film is formed yet, and unnecessary to be disposed at a region where the sprayed film is already formed.
  • the film formed through the arc-spraying may have a uniform thickness across the entire surface of the plug, or may have a heavier thickness at the tip end portion than at the body portion of the plug.
  • the film having a heavier thickness at the tip end portion of the plug is useful in light of securing enhanced thermal insulation performance and wear resistance of the film at the tip end portion of the plug where the surficial pressure becomes high and the temperature is increased during the piercing-rolling, so that further enhancement of the durability life of the plug can be expected.
  • a piercing-rolling test was conducted in such a manner that plugs for piercing-rolling were produced, and each of the produced plugs was mounted to a piercer so as to carry out the piercing-rolling.
  • the test condition was as follows.
  • Plugs having the arc-sprayed film were produced in such a manner that the arc-spraying was carried out by using iron wires under various operation conditions of the arc-spraying, so as to form a film on the surface of the base metal of each plug.
  • the arc-spraying was conducted for each plug with the spraying distance from the spray gun to the surface of the plug base metal initially fixed at 200 mm, and the arc-spraying was carried out while the spray gun was gradually distanced away from the surface of the plug base metal until the spraying distance finally became 1000 mm.
  • the thickness of the arc-sprayed film was set to 400 ⁇ m at the body portion of the plug, and 1200 ⁇ m at the tip end of the plug.
  • plugs having scale films were produced by forming an oxide scale film on the surface of the base metal of each plug through a heat treat furnace.
  • the thickness of the scale film was set to 600 ⁇ m.
  • the arc-spraying is carried out while the spray gun 4 is being moved across the entire region from the rear end to the tip end of the surface of the plug base metal 2.
  • the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is deviated from the preferable range at the tip end portion 1a of the plug.
  • the arc-spraying is carried out while the spray gun 4 is being moved across the entire regions of the body portion 1b and of the tip end portion 1a of the plug.
  • the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is deviated from the preferable range at the body portion 1b of the plug.
  • step 1 as shown in FIG. 10(a) , with the center line A c of the spraying stream from the spray gun 4 always maintained to be parallel to the central axis P c of the plug metal base 2, the arc-spraying is carried out to the body portion 1b of the plug while the sprayer 4 is being moved along only the region of the body portion 1b of the plug.
  • step 2 as shown in FIG, 10(b) , with the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 always being set to 25 degrees, the arc-spraying is carried out to the tip end portion 1a of the plug while the spray gun 4 is being moved along only the region of the tip end portion 1a of the plug.
  • intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is deviated from the preferable range across the entire regions of the tip end portion 1a and of the body portion 1b of the plug.
  • the posture of the spray gun 4 is controlled so as to carry out the arc-spraying in such a manner that the center line A c of the spraying stream from the spray gun 4 intersects at right angle with the central axis P c of the plug metal base 2 at the rear end of the plug base metal 2, and the center line A c of the spraying stream from the spray gun 4 becomes parallel to the central axis P c of the plug metal base 2 at the tip end of the plug base metal 2 while the spray gun 4 is being moved across the entire region from the rear end to the tip end of the surface of the plug base metal 2.
  • the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is deviated from the preferable range in vicinity of the boundary between the tip end portion 1a and the body portion 1b of the plug.
  • step 1 the arc-spraying is carried out to the body portion 1b of the plug by controlling the posture of the spray gun 4 in such a manner that the spray gun 4 is moved along only the region of the body portion 1b of the plug while the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is set to 90 degrees on the rear end side of the body portion 1b of the plug, and is set to more than 35 degrees on the tip end side of the body portion 1b of the plug.
  • step 2 as shown in FIG.
  • the arc-spraying is carried out to the tip end portion 1a of the plug in such a manner that the spray gun 4 is moved along only the region of the tip end portion 1a of the plug while the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is always maintained at 90 degrees.
  • the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is within the preferable range across the entire regions of the tip end portion 1a and of the body portion 1b of the plug.
  • step 1 the arc-spraying is carried out to the body portion 1b of the plug by controlling the posture of the spray gun 4 in such a manner that the spray gun 4 is moved along only the region of the body portion 1b of the plug while the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is always set to 90 degrees.
  • step 2 as shown in FIG.
  • the arc-spraying is carried out to the tip end portion 1a of the plug in such a manner that the spray gun 4 is moved along only the region of the tip end portion 1a of the plug while the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is always maintained at 45 degrees.
  • the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is within the preferable range across the entire regions of the tip end portion 1a and of the body portion 1b of the plug.
  • step 1 the arc-spraying is carried out to the body portion 1b of the plug by controlling the posture of the spray gun 4 in such a manner that the spray gun 4 is moved along only the region of the body portion 1b of the plug while the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is always set to 90 degrees.
  • step 2 as shown in FIG.
  • the arc-spraying is carried out to the tip end portion 1a of the plug in such a manner that the spray gun 4 is moved along only the region of the tip end portion 1a of the plug while the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is always maintained at 90 degrees.
  • the intersection angle ⁇ between the center line A c of the spraying stream from the spray gun 4 and the surface of the plug base metal 2 is within the preferable range across the entire regions of the tip end portion 1a and of the body portion 1b of the plug.
  • the following hollow shells were produced by repetitively piercing-rolling the following workpieces (materials) heated at 1200°C.
  • Table 1 No Classification (Reference Illustration) Satisfiability on Preferable Range of Intersection Angle ⁇ (35° to 90°) Plug Durability Life Ratio Plug Surface Condition after Piercing-rolling 1 Comparative Example 1 ( FIG. 8 ) Deviated at Plug Tip End Portion 0.5 Seizing at Tip End Portion 2 Comparative Example 2 ( FIG. 9 ) Deviated at Plug Body Portion 1.0 Film Peel-off at Body Portion 3 Comparative Example 3 ( FIG. 10 ) Deviated across Entire Plug 0.5 Film Peel-off from Tip End Portion to Body Portion 4 Comparative Example 4 ( FIG.
  • the present invention can be effectively used in production of seamless steel tube/pipe of high alloy steel.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP13782357.1A 2012-04-24 2013-03-19 Procédé de fabrication d'un mandrin de perçage Active EP2845655B1 (fr)

Applications Claiming Priority (2)

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JP2012098448A JP5365723B2 (ja) 2012-04-24 2012-04-24 穿孔圧延用プラグの製造方法
PCT/JP2013/001858 WO2013161176A1 (fr) 2012-04-24 2013-03-19 Procédé de fabrication d'un mandrin de perçage

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EP2845655A1 true EP2845655A1 (fr) 2015-03-11
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EP (1) EP2845655B1 (fr)
JP (1) JP5365723B2 (fr)
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AR (1) AR090817A1 (fr)
BR (1) BR112014023120B1 (fr)
CA (1) CA2867101C (fr)
MX (1) MX367930B (fr)
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EP3767002A4 (fr) * 2018-03-14 2021-01-20 Nippon Steel Corporation Perceur-mandrineur

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JP5582910B2 (ja) * 2010-07-30 2014-09-03 三菱重工業株式会社 遮熱コーティング施工方法
BR112017015320B1 (pt) * 2015-02-09 2022-12-06 Nippon Steel Corporation Método de produção de plugue
BR112017028179B1 (pt) * 2015-09-28 2023-02-07 Nippon Steel Corporation Pino e método para sua fabricação

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Publication number Priority date Publication date Assignee Title
EP3767002A4 (fr) * 2018-03-14 2021-01-20 Nippon Steel Corporation Perceur-mandrineur

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CA2867101A1 (fr) 2013-10-31
WO2013161176A1 (fr) 2013-10-31
CA2867101C (fr) 2017-05-16
JP5365723B2 (ja) 2013-12-11
AR090817A1 (es) 2014-12-10
BR112014023120B1 (pt) 2021-09-28
MX367930B (es) 2019-09-09
JP2013226563A (ja) 2013-11-07
MX2014012499A (es) 2015-01-15
BR112014023120A2 (pt) 2017-06-20
RU2593884C2 (ru) 2016-08-10
RU2593884C9 (ru) 2016-12-27
CN104284741A (zh) 2015-01-14
EP2845655A4 (fr) 2016-02-24
US20150132501A1 (en) 2015-05-14
CN104284741B (zh) 2016-08-17
EP2845655B1 (fr) 2018-08-01
RU2014146991A (ru) 2016-06-10

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