EP3257596B1 - Procédé de fabrication d'un tampon - Google Patents

Procédé de fabrication d'un tampon Download PDF

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Publication number
EP3257596B1
EP3257596B1 EP15881895.5A EP15881895A EP3257596B1 EP 3257596 B1 EP3257596 B1 EP 3257596B1 EP 15881895 A EP15881895 A EP 15881895A EP 3257596 B1 EP3257596 B1 EP 3257596B1
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EP
European Patent Office
Prior art keywords
plug
base metal
end side
divided
peripheral surface
Prior art date
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EP15881895.5A
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German (de)
English (en)
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EP3257596A1 (fr
EP3257596A4 (fr
Inventor
Kazuhiro Shimoda
Kouji Yamane
Yasuto Higashida
Yasuyoshi Hidaka
Yuji Inoue
Shusuke SHIMOOKA
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Nippon Steel Corp
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Nippon Steel Corp
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Publication of EP3257596A4 publication Critical patent/EP3257596A4/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
    • C23C4/12—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
    • 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
    • C23C4/04—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
    • 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
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length

Definitions

  • the present invention relates to a method for producing a plug that is used in a piercing-rolling mill when producing a seamless steel pipe.
  • a seamless steel pipe can be produced by the Mannesmann pipe making process.
  • This production process includes the following steps:
  • the piercing-rolling mill includes: a pair of skew rolls that are each inclined with respect to a pass line; a bullet-shaped plug that is disposed on the pass line; and a mandrel connected to the rear end of the plug.
  • the billet In the piercing-rolling, in a state in which the axial directions of the pass line and the billet are matched, the billet is fed in the axial direction while being rotated in the circumferential direction by the skew rolls. Then, a central portion of the billet is pushed against the plug, and as a result the billet is pierced and rolled into a hollow shell.
  • a film hereunder, also referred to as "arc-sprayed film”
  • the arc-sprayed film blocks the transfer of heat from the billet to the plug base metal, and can also prevent seizing between the billet and the plug.
  • Patent Literature 1 a method is proposed in which the surface of the base metal of a plug is divided into a plurality of regions along an axial direction of the plug, and arc-spraying is performed separately in succession in each of the plurality of regions. Further, when performing the arc spraying, an intersection angle between the center line of a spray stream from the arc-sprayer and the surface of the base metal of the plug is maintained within a range of 35° to 90°. In this way, the adhesiveness of the arc-sprayed film formed on the surface of the plug can be made firm, and as a result the lifetime of the plug can be further increased.
  • a plug proposed in Patent Literature 2 has a front end rolling portion, a work portion and a reeling portion. Further, various dimensions, such as the outer diameter, of the plug satisfy a predetermined relational expression.
  • the front end rolling portion includes a columnar portion and a hemispherical portion that is provided at the front end of the columnar portion.
  • the work portion connects to the rear end of the front end rolling portion, and the cross-sectional shape of the work portion is a circular arc shape.
  • the reeling portion connects to the rear end of the work portion, and the cross-sectional shape of the reeling portion is a linear tapered shape.
  • Patent Literature 2 by performing piercing-rolling using the above described plug, defective bite of a billet can be prevented and the occurrence of inner surface flaws can also be suppressed.
  • a plug proposed in Patent Literature 3 has a rolling portion, a reeling portion and a relief portion.
  • the rolling portion is divided into a preceding stage rolling portion and a succeeding stage rolling portion.
  • the cross-sectional shape of the outer peripheral surface of the preceding stage rolling portion is a circular arc shape, and a front end of the preceding stage rolling portion is a hemispherical shape.
  • the succeeding stage rolling portion connects to the rear end of the outer peripheral surface of the preceding stage rolling portion, and the cross-sectional shape of the succeeding stage rolling portion is a linear tapered shape.
  • the reeling portion connects to the rear end of the succeeding stage rolling portion, and the cross-sectional shape of the reeling portion is a linear tapered shape.
  • the relief portion connects to the rear end of the reeling portion, and the diameter of the relief portion progressively decreases as the distance from the front end increases.
  • dimensions such as the radius of curvature of the front end satisfy a predetermined relational expression.
  • Patent Literature 5 discloses a plug 2 which includes: a front portion 21 having a convex curvature; a column portion 22 having approximately a columnar shape; a trunk portion 23 having an outside diameter which is enlarged gradually toward the rear end; a mandrel connecting portion 26 provided in the rear end portion of the plug 2 and a lubricant jetting hole 24 which penetrates the trunk portion 23 from the mandrel connecting portion 26 and opened on the surface of the column portion 22.
  • a coating film 27 which is composed of oxides and Fe is formed by arc spraying method using an iron wire.
  • the plug 2 pierces a base stock while jetting the lubricant from the jetting hole 24.
  • Patent Literature 6 discloses a plug for hot tube-making includes: a plug main body; a build-up layer formed around an axis of the plug main body on a surface of the plug, main body, and a sprayed coating formed on a surface of the build-up layer.
  • Patent Literature 1 proposes a method in which the surface of the base metal of the plug is divided into a plurality of regions along the axial direction of the plug, and arc spraying is then performed separately in succession in each of the plurality of regions.
  • arc spraying is performed separately in each region in this manner, films are connected together at the boundaries of the regions.
  • FIG. 1 is a SEM image that shows arc-sprayed films at a boundary between regions in a case where arc spraying was performed separately in respective regions.
  • a plug base metal 10 and arc-sprayed films 20a and 20b are illustrated, with the arc-sprayed films being composed of the film 20b that is on the front-end side and the film 20a that is on the rear-end side.
  • the term "front-end side” means the front-end side of the plug
  • the term “rear-end side” means the rear-end side of the plug.
  • the film 20b on the front-end side and the film 20a on the rear-end side are connected at a portion that is surrounded by a chain double-dashed line in FIG. 1 . In this case, a portion of the film 20b on the front-end side is formed on the film 20a on the rear-end side without coming in contact with the plug base metal 10.
  • the spraying direction for the film 20b on the front-end side and the spraying direction for the film 20a on the rear-end side are indicated by solid-line arrows, respectively.
  • connection portion At a portion at which the arc-sprayed films are connected together (hereunder, also referred to simply as "connecting portion"), because another film is formed on a certain film, the adherence of the films decreases in comparison to other portions of the films. Further, a range in which another film is formed on a certain film as well as the thicknesses of the respective films and the like change in the circumferential direction of the plug, and for this reason also the adherence of the films at the connecting portion decreases. Consequently, peeling of a film is liable to occur at the connecting portion (see FIG. 9 of Examples as described later). When peeling of a film occurs on a plug, it is the end of the lifetime of the plug and the plug is not used for piercing-rolling again. Therefore, in a case where arc spraying is performed separately in respective regions, it is desirable to suppress peeling of a film at a connecting portion and thereby increase the lifetime of the plug.
  • high alloy steel corresponds to, for example, high Cr steel containing 9% or more of Cr, an Ni-based alloy, and stainless steel.
  • Patent Literatures 2 and 3 propose the use of plugs that each have a predetermined shape and satisfy a predetermined relational expression, there is no description in Patent Literatures 2 and 3 regarding formation and peeling of a film.
  • An objective of the present invention is to provide a method for producing a plug that can prevent peeling of a film at a connecting portion and thereby increase the lifetime of the plug.
  • a method for producing a plug according to the present invention is a method for producing a plug that is used in a piercing-rolling mill when producing a seamless steel pipe according to claim 1.
  • the method for producing a plug includes: a step of preparing a plug base metal having a concave portion along a circumferential direction in an outer peripheral surface; and an arc spraying step of spraying a spraying wire rod material onto the outer peripheral surface of the plug base metal by arc spraying to form films containing Fe and Fe oxides on the outer peripheral surface of the plug base metal.
  • the arc spraying step includes: a separating step of separating the outer peripheral surface of the plug base metal into a plurality of regions along an axial direction; and a step of performing arc spraying separately in each of the regions.
  • a boundary between the regions is set at the concave portion.
  • the outer peripheral surface is formed by connecting a plurality of divided faces successively in the axial direction, and has the concave portion at a joint between the divided faces.
  • a slope ⁇ 1 (°) of a divided face located on a front-end side of the plug and a slope ⁇ 2 (°) of a divided face located on a rear-end side of the plug satisfy the following Formula (1).
  • the method for producing a plug of the present invention uses a plug base metal which has a concave portion along a circumferential direction on the outer peripheral surface thereof. Further, a boundary between regions is set at the concave portion to divide the outer peripheral surface into a plurality of regions, and an arc-sprayed film is formed in each region.
  • a connecting portion between the films is located at the concave portion, and the amount of reduction in wall-thickness of a billet when performing piercing-rolling is comparatively low at the concave portion. Consequently, peeling of the films can be suppressed and the lifetime of the plug can be increased.
  • FIG. 2(a) to FIG. 2(c) are schematic diagrams illustrating an example of a processing flow according to the method for producing a plug of the present invention, in which FIG. 2(a) is a view illustrating the shape of a plug base metal, FIG. 2(b) is a cross-sectional view illustrating a state after the end of film formation in a first region, and FIG. 2(c) is a cross-sectional view illustrating a state after the end of film formation in a second region.
  • a plug base metal 10 and arc-sprayed films 20a and 20b are shown.
  • a front-end side of the plug is denoted by reference character T
  • a rear-end side thereof is denoted by reference character B.
  • An outer peripheral surface 11 of the plug base metal 10 shown in FIG. 2(a) is formed by connecting first to fifth divided faces 11a to 11e successively in the axial direction.
  • the outer peripheral surface 11 is divided into a plurality of sections at a face that is perpendicular to the axial direction.
  • the first divided face 11a and the second divided face 11b each have a cross-sectional shape that is curved, and in which a slope changes in the axial direction.
  • the term "slope" refers to an angle formed by the divided face and a center line of the plug base metal (see ⁇ 1 and ⁇ 2 in FIG. 2(a) ).
  • the third divided face 11c has a cross-sectional shape that is linear, in which the slope is constant.
  • the outer diameters of the first to third divided faces 11a to 11c each increase progressively from the front-end side T toward the rear-end side B.
  • the fourth divided face 11d is a cylindrical portion whose outer diameter is constant. Further, the outer diameter of the fifth divided face 11e decreases toward the rear end.
  • the fifth divided face 11e is called a "relief portion".
  • the first to third divided faces 11a to 11c contribute to the piercing-rolling. In other words, the first to third divided faces 11a to 11c strongly contact against the billet, and a high surficial pressure at a high temperature is imposed on these divided faces.
  • a joint between the first divided face 11a and the second divided face 11b is a concave portion 11z.
  • a plug base metal having a concave portion along the circumferential direction as illustrated in FIG. 2(a) is prepared.
  • the method for producing a plug of the present embodiment includes a step of preparing the plug base metal as described above, and an arc spraying step.
  • a spraying wire rod for example, steel wire
  • the Fe particles are sprayed onto the outer peripheral surface 11 of the base metal of the plug.
  • Fe particles build up on the outer peripheral surface 11 of the base metal of the plug, and the films 20a and 20b are formed.
  • some of the Fe particles undergo an oxidation reaction with atmospheric air and form Fe oxides. Consequently, the films 20a and 20b contain Fe and Fe oxides.
  • the outer peripheral surface 11 of the base metal of the plug is divided into a plurality of regions in the axial direction, and a film is formed in each of the regions, respectively.
  • the adhesiveness of the arc-sprayed films formed on the surface of the plug can be made firm.
  • the outer peripheral surface 11 of the base metal of the plug is divided into a first region S1 on the rear-end side B and a second region S2 of a front-end side T, and a film is first formed in the first region S1, and thereafter a film is formed in the second region S2.
  • the boundary between the regions is set at the concave portion 11z.
  • a connecting portion between the arc-sprayed films as shown in the aforementioned FIG. 1 is located at the concave portion 11z.
  • the amount of reduction in wall-thickness of the billet at the concave portion 11z is low in comparison to other portions, and the surficial pressure imposed on the concave portion 11z is also partially lower.
  • the surficial pressure imposed on the connecting portion 20z of the films is also moderated. Because the connecting portion is located at the concave portion 11z, as described above, although the adherence of the films at the connecting portion decreases similarly to the prior art, by moderating the surficial pressure that is interposed on the connecting portion 20z of the films, peeling of the films can be suppressed and the lifetime of the plug can be thereby increased.
  • the term "concave portion” refers to a portion at which, among the entire outer peripheral surface of the plug base metal, the amount of reduction in wall-thickness of the billet is lower than at other portions.
  • a closed curve is formed along the circumferential direction by the following points A, and the vicinity of the closed curve is the concave portion.
  • the points A are points on the outer peripheral surface of the plug base metal, and a slope ⁇ 1 (°) on the front-end side of the points, and a slope ⁇ 2 (°) on the rear-end side of the points satisfy the relation in the following Formula (1).
  • the amount of reduction in wall-thickness of the billet is less than at other portions.
  • the slope ⁇ 1 on the front-end side of a point is taken as an angle that is formed between the center line of the plug base metal and a tangential line of the outer peripheral surface on the front-end side relative to the relevant point among the entire tangential line of the outer peripheral surface at the relevant point
  • the slope ⁇ 2 on the rear-end side of the point is taken as an angle that is formed between the center line of the plug base metal and a tangential line of the outer peripheral surface on the rear-end side relative to the relevant point among the entire tangential line of the outer peripheral surface at the relevant point.
  • a plug base metal in which the outer peripheral surface 11 is formed by connecting a plurality of divided faces successively in the axial direction as shown in the above described FIG. 2 is adopted as the plug base metal.
  • the concave portion 11z is disposed at a joint at which the slope ⁇ 1 (see FIG. 2 , unit is "°") of the divided face on the front-end side T and the slope ⁇ 2 (see FIG. 2 , unit is "°") of the divided face on the rear-end side B satisfy the relation in the above described Formula (1).
  • the slopes ⁇ 1 and ⁇ 2 of the divided faces are taken as angles formed between the respective divided faces and the center line of the plug base metal.
  • the respective slopes ⁇ 1 and ⁇ 2 of the divided faces are taken as the slope of a tangential line at the relevant joint.
  • d ⁇ is 0.5° or more at the concave portion 11z at which the boundary between the regions is set.
  • d ⁇ is the difference ( ⁇ 2- ⁇ 1) between ⁇ 2 and ⁇ 1. If d ⁇ is 0.5° or more, the amount of reduction in wall-thickness of the billet at the concave portion is low, and peeling of the films can be suppressed. On the other hand, if d ⁇ exceeds 20°, because there will also be a large change in the amount of reduction in wall-thickness, there is a risk that the dimension accuracy of an obtained hollow shell will deteriorate. Therefore, d ⁇ is preferably made 20° or less.
  • the order of the regions in which arc spraying is performed is not particularly limited, and peeling of the films can be suppressed if the boundary between the regions is set at the concave portion. From the viewpoint of suppressing peeling of films to a greater degree, it is preferable that the arc spraying for the respective regions is first performed in the region on the rear-end side of the concave portion, and thereafter is performed in the region on the front-end side of the concave portion. This is because, at the connecting portion, since the film on the front-end side will be formed on the film on the rear-end side, the film on the rear-end side will be covered by the film on the front-end side.
  • Separating the outer peripheral surface into regions is not limited to separating the outer peripheral surface into two regions as illustrated in the above described FIG. 2 , and the outer peripheral surface may be separated into three or more regions. In such a case, it is preferable that boundaries between the plurality of regions are each set at a concave portion.
  • the plug base metal is not limited to the plug base metal illustrated in the above described FIG. 2 , and various plug base metals can be used as long as the plug base metal fulfills the requirements of claim 1.
  • plugs described in the aforementioned Patent Literatures 2 and 3 may be adopted as the plug base metal.
  • the plug described in the aforementioned Patent Literature 2 has a concave portion at a joint between the front end rolling portion and the work portion.
  • the plug described in the aforementioned Patent Literature 3 has a concave portion at a joint between the preceding stage rolling portion and the succeeding stage rolling portion.
  • the plug base metal illustrated in the above described FIG. 2 has the cylindrical portion 11d whose outer diameter is constant, a plug base metal that does not have a cylindrical portion may also be adopted.
  • the rear-end side of the portions 11a to 11c which mainly contribute to piercing-rolling is connected to the relief portion 11e.
  • a front end 11t of the outer peripheral surface 11 of the plug base metal is not limited to a case where the front end extends as far as a center line as in the plug base metal shown in the aforementioned FIG. 2 , and the front end 11t may connect to a planar front end face.
  • FIG. 3(a) to FIG. 3(d) are schematic diagrams illustrating an example of a processing flow according to the present invention in a case of using a plug in which the front end of the outer peripheral surface is connected to a planar front end face
  • FIG. 3(a) is a view illustrating the shape of the plug base metal
  • FIG. 3(b) is a cross-sectional view illustrating a state after the end of film formation in a first region
  • FIG. 3(c) is a cross-sectional view illustrating a state after the end of film formation in a second region
  • FIG. 3(d) is a cross-sectional view illustrating a state after the end of film formation on the front end face.
  • the plug base metal 10 and the arc-sprayed films 20a and 20b are illustrated.
  • the front end 11t of the outer peripheral surface 11 is connected to a planar front end face 12. Further, the outer peripheral surface 11 is formed by successively connecting the first to fifth divided faces 11a to 11e in the axial direction. Further, in the first to third divided faces 11a to 11c, the outer diameter progressively increases from the front-end side T toward the rear-end side B.
  • the first divided face 11a has a cross-sectional shape that is a curved shape, and the slope thereof changes in the axial direction. Further, the slopes of the second divided face 11b and the third divided face 11c are constant, and the cross-sectional shape of these divided faces is a linear tapered shape.
  • the fourth divided face 11d is a cylindrical portion
  • the fifth divided face 11e is a relief portion.
  • the first to third divided faces 11a to 11c contribute to piercing-rolling. Further, among the joints of the divided faces, the joint between the second divided face 11b and the third divided face 11c is the concave portion 11z along the circumferential direction.
  • the outer peripheral surface of the plug base metal is separated into a first region S1 on the rear-end side B and a second region S2 on the front-end side T.
  • the boundary between the first region S1 and the second region S2 is set at the concave portion 11z.
  • the film 20b is formed in the second region S2 after the film 20a is formed in the first region S1, and thereafter a film 20c is formed on the front end face 12.
  • the concave portion 11z is disposed at a portion that mainly contributes to piercing-rolling among the entire outer peripheral surface of the plug base metal, in other words, at a portion excluding the cylindrical portion and relief portion. This is because peeling of films is liable to occur if a connecting portion between the films is located at a portion that mainly contributes to piercing-rolling.
  • steel wire can be used as the spraying wire rod.
  • a cored wire as described in Patent Literature 4 can also be used as the spraying wire rod.
  • the cored wire includes a steel sheath tube, and powder that is filled inside the steel sheath tube.
  • ZrO 2 powder or BN powder can be adopted as the powder that is filled inside the tube.
  • Iron oxide powder can also be adopted as the powder, and in such case, steel powder may be additionally filled inside the tube.
  • the steel wire is, for example, a wire rod formed of carbon steel (common steel)
  • the steel sheath tube is, for example, a tube formed of carbon steel (common steel)
  • the steel powder is, for example, carbon steel (common steel) powder.
  • the carbon steel typically includes Fe as a principal component, and also includes carbon (C), silicon (Si), manganese (Mn) and impurities.
  • the carbon steel is also referred to as "common steel", and may contain optional elements such as tungsten (W).
  • plugs were produced and piercing-rolling was performed using the plugs.
  • a plug base metal made of hot working tool steel as defined by the JIS was prepared.
  • a steel wire was atomized and sprayed by an arc-sprayer onto the outer peripheral surface of the plug base metal, and films composed of Fe and Fe oxides were formed.
  • the outer peripheral surface of the plug base metal was separated into a region on the rear-end side and a region on the front-end side, and a film was first formed in the region on the rear-end side and thereafter a film was formed in the region on the front-end side.
  • Test Nos. 1 to 7 were conducted as the present tests, and the shape of the plug base metal as well as a boundary position between the first region and the second region were changed for the respective tests.
  • FIG. 4(a) to FIG. 4(c) are schematic diagrams illustrating the processing flow with respect to Test No. 1 (Comparative Example), in which FIG. 4(a) is a view illustrating the shape of the plug base metal, FIG. 4(b) is a cross-sectional view illustrating a state after the end of film formation in the first region, and FIG. 4(c) is a cross-sectional view illustrating a state after the end of film formation in the second region.
  • the outer peripheral surface 11 of the plug base metal was constituted by first to third divided faces 11a to 11c.
  • the cross-sectional shape of the first divided face 11a was a curved shape.
  • the second divided face 11b was a cylindrical portion, and the third divided face 11c was a relief portion.
  • the first divided face 11a contributes to piercing-rolling.
  • Test No. 1 a plug base metal that did not have a concave portion was used, and a boundary between the region S1 and S2 was set on the first divided face 11a.
  • the target values for the thickness of the films were set as 300 ⁇ m in the first region S1 and 800 ⁇ m in the second region S2.
  • films were formed in accordance with the processing flow example illustrated in the above described FIG. 2 .
  • a plug base metal having the concave portion 11z at a joint between the first divided face 11a and the second divided face 11b was used, and the boundary between the regions S1 and S2 was set at the concave portion 11z.
  • the slope ⁇ 1 of the first divided face 11a was 10° and the slope ⁇ 2 of the second divided face 11b was 23.5°.
  • the target values for the thickness of the films were set as 300 ⁇ m in the first region S1 and 800 ⁇ m in the second region S2.
  • FIG. 5(a) and FIG. 5(b) are cross-sectional views that schematically illustrate the processing flow with respect to Test No. 3 (Comparative Example), in which FIG. 5(a) illustrates a state after the end of film formation in the first region, and FIG. 5(b) illustrates a state after the end of film formation in the second region.
  • the plug base metal of Test No. 3 had the concave portion 11z, similarly to Test No. 2.
  • the boundary between the regions S1 and S2 was not set at the concave portion 11z, and was instead set on the second divided face 11b.
  • the target values for the thickness of the films were set to the same values as in Test No. 2.
  • Test No. 4 (Inventive Example of the present invention), films were formed in accordance with the processing flow example illustrated in the above described FIG. 3(b) to FIG. 3(d) .
  • the plug base metal had the concave portion 11z at a joint between the first divided face 11a and the second divided face 11b, and the front end 11t of the outer peripheral surface was connected to the planar front end face 12.
  • the boundary between the regions S1 and S2 was set at the concave portion 11z.
  • the slope ⁇ 1 of the first divided face 11a was 6.5°
  • the slope ⁇ 2 of the second divided face 11b was 7.5°.
  • the target values for the thickness of the films were set as 300 ⁇ m in the first region S1, 600 ⁇ m in the second region S2, and 800 ⁇ m at the front end face 12.
  • FIG. 6(a) to FIG. 6(c) are cross-sectional views that schematically illustrate the processing flow with respect to Test No. 5 (Comparative Example), in which FIG. 6(a) illustrates a state after the end of film formation in a first region, FIG. 6(b) illustrates a state after the end of film formation in a second region, and FIG. 6(c) illustrates a state after the end of film formation on a front end face.
  • the plug base metal of Test No. 5 had the concave portion 11z, similarly to Test No. 4.
  • Test No. 5 unlike Test No. 4, the boundary between the regions S1 and S2 was not set at the concave portion 11z, and was instead set in the first divided face 11a.
  • the target values for the thickness of the films were set to the same values as in Test No. 4.
  • FIG. 7(a) to FIG. 7(d) are schematic diagrams that illustrate the processing flow with respect to Test No. 6 (Inventive Example of the present invention), in which FIG. 7(a) is a view illustrating the shape of a plug base metal, FIG. 7(b) is a cross-sectional view illustrating a state after the end of film formation in a first region, FIG. 7(c) is a cross-sectional view illustrating a state after the end of film formation in a second region, and FIG. 7(d) is a cross-sectional view illustrating a state after the end of film formation on a front end face.
  • a plug base metal was used in which the outer peripheral surface 11 was composed of first to sixth divided faces 11a to 11f.
  • the front end 11t of the outer peripheral surface 11 was connected to the planar front end face 12.
  • the first to fourth divided faces 11a to 11d contributed to piercing-rolling
  • the fifth divided face 11e was a cylindrical portion
  • the sixth divided face 11f was a relief portion.
  • the joint between the second divided face 11b and the third divided face 11c was the concave portion 11z.
  • the slope ⁇ 1 of the second divided face 11b was 5°
  • the slope ⁇ 2 of the third divided face 11c was 8°.
  • the boundary between the regions S1 and S2 to undergo arc spraying was set at the concave portion 11z.
  • the target values for the thickness of the films was set as 300 ⁇ m for the first region S1, 600 ⁇ m for the second region S2, and 800 ⁇ m for the front end face 12.
  • FIG. 8(a) to FIG. 8(c) are cross-sectional views that illustrate a processing flow with respect to Test No. 7 (Comparative Example), in which FIG. 8(a) illustrates a state after the end of film formation in a first region, FIG. 8(b) illustrates a state after the end of film formation in a second region, and FIG. 8(c) illustrates a state after the end of film formation on a front end face.
  • the plug base metal of Test No. 7 had the concave portion 11z, similarly to Test No. 6.
  • the boundary between the regions S1 and S2 was set at the joint between the first divided face 11a and the second divided face 11b, and not at the concave portion 11z.
  • the target values for the thickness of the films were set to the same values as in Test No. 6.
  • the maximum diameter of the plug was set to 57 mm, and the length of the plug was set to 114 mm as the total length of the divided faces that mainly contribute to piercing-rolling.
  • Each plug was repeatedly used three times in piercing-rolling utilizing a model mill.
  • the billets that were used were made of SUS 304 stainless steel. Table 1 shows the piercing-rolling conditions, the billet dimensions, and the dimensions of the obtained hollow shell.
  • Test Nos., test categories, and film states are shown in Table 2.
  • FIG. 9 is a photograph showing peeling of a film.
  • FIG. 9 shows the plug used in Test No. 1 (Comparative Example) after piercing-rolling was performed three times.
  • a portion of a region at which a film peeled is surrounded by a chain double-dashed line.
  • the film 20a on the rear-end side partially peeled in a manner in which the starting point of the peeling was the connecting portion 20z between the film 20a on the rear-end side and the film 20b on the front-end side.
  • the present invention can be effectively utilized in the production of seamless steel pipes made from high alloy steel.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (2)

  1. Procédé de production d'un bouchon qui est utilisé dans un perceur-laminoir lors de la production d'un tuyau en acier sans soudure, le procédé comprenant :
    une étape de préparation d'un métal de base de bouchon (10) présentant une portion concave (11z) le long d'une direction circonférentielle dans une surface périphérique externe (11), et
    une étape de pulvérisation à l'arc pulvérisant un matériau de fil machine pour pulvérisation sur la surface périphérique externe (11) du métal de base de bouchon (10) par pulvérisation à l'arc pour former des films (20a, 20b) contenant Fe et des oxydes de Fe sur la surface périphérique externe (11) du métal de base de bouchon (10) ;
    dans lequel :
    l'étape de pulvérisation à l'arc inclut :
    une étape de séparation séparant la surface périphérique externe (11) du métal de base de bouchon (10) en plusieurs régions (S1, S2) le long d'une direction axiale, et
    une étape de réalisation de pulvérisation à l'arc séparément dans chacune des régions ; et
    dans l'étape de séparation, une limite entre les régions est fixée sur la portion concave (11z),
    dans le métal de base de bouchon (10), la surface périphérique externe (11) est formée par connexion de plusieurs faces divisées (11a, ..., 11f) successivement dans la direction axiale,
    les plusieurs faces divisées (11a, ..., 11f) incluent deux faces divisées ou plus qui sont successivement connectées et dont les diamètres externes augmentent chacun progressivement à partir d'un côté d'extrémité avant vers un côté d'extrémité arrière, et
    la portion concave (11z) est disposée à un joint entre les faces divisées dont les diamètres externes augmentent chacun progressivement à partir d'un côté d'extrémité avant vers un côté d'extrémité arrière, et dans lequel,
    au joint qui est la portion concave (11z), une pente θ1 (°) d'une face divisée disposée sur un côté d'extrémité avant (11a - Figs. 2 et 3 ; 11b - Fig. 7) du bouchon et une pente θ2 (°) d'une face divisée disposée sur un côté d'extrémité arrière (11b - Figs. 2 et 3 ; 11c - Fig. 7) du bouchon satisfont la formule (1) suivante θ 1 < θ 2
    Figure imgb0005
     dans laquelle la pente θ1 est un angle formé par la face divisée disposée sur un côté d'extrémité avant (11a - Fig. 2 et 3 ; 11b - Fig. 7) du bouchon et une ligne centrale du métal de base de bouchon, et la pente θ2 est un angle formé par la face divisée disposée sur un côté d'extrémité arrière (11b - Figs. 2 et 3 ; 11c - Fig. 7) du bouchon et une ligne centrale du métal de base de bouchon.
  2. Procédé de production d'un bouchon selon la revendication 1, dans lequel :
    la différence dθ entre la pente θ2 et la pente θ1 se trouve dans un intervalle de 0,5° à 20°.
EP15881895.5A 2015-02-09 2015-11-18 Procédé de fabrication d'un tampon Active EP3257596B1 (fr)

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JP6380562B2 (ja) 2018-08-29
EP3257596A4 (fr) 2017-12-20
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BR112017015320A2 (pt) 2018-01-09
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