WO2013157312A1 - 熱間製管用プラグの製造方法 - Google Patents
熱間製管用プラグの製造方法 Download PDFInfo
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- WO2013157312A1 WO2013157312A1 PCT/JP2013/056063 JP2013056063W WO2013157312A1 WO 2013157312 A1 WO2013157312 A1 WO 2013157312A1 JP 2013056063 W JP2013056063 W JP 2013056063W WO 2013157312 A1 WO2013157312 A1 WO 2013157312A1
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- WO
- WIPO (PCT)
- Prior art keywords
- plug
- heat treatment
- thermal spray
- spray coating
- iron
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 74
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000011248 coating agent Substances 0.000 claims abstract description 37
- 238000000576 coating method Methods 0.000 claims abstract description 37
- 229910052742 iron Inorganic materials 0.000 claims abstract description 32
- 238000005507 spraying Methods 0.000 claims description 64
- 238000010438 heat treatment Methods 0.000 claims description 55
- 235000013980 iron oxide Nutrition 0.000 description 24
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 20
- 239000000463 material Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 16
- 239000007921 spray Substances 0.000 description 9
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 8
- 229910052595 hematite Inorganic materials 0.000 description 7
- 239000011019 hematite Substances 0.000 description 7
- 238000007751 thermal spraying Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
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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
- 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
- C23C4/04—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
- C23C4/18—After-treatment
-
- 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
- B21B25/04—Cooling or lubricating mandrels during operation
Definitions
- the present invention relates to a method for manufacturing a plug for hot pipe manufacturing (hereinafter simply referred to as a plug), and more particularly to a method for manufacturing a plug included in a drilling machine (piercer) and an elongator.
- the Mannesmann pipe manufacturing method is widely adopted as a seamless pipe manufacturing method.
- a round billet heated to around 1200 ° C. is pierced and rolled with a piercing machine (piercer).
- the perforator includes a pair of inclined rolls and a plug.
- the plug is disposed between the pair of inclined rolls and on the pass line.
- the piercing machine pushes the round billet into the plug while rotating it in the circumferential direction by an inclined roll, and pierces and rolls the round billet into a hollow shell (hollow shell).
- the elongator stretches and rolls the hollow shell, and expands and thins the hollow shell.
- the elongator has the same configuration as the drilling machine, and includes a pair of inclined rolls and a plug.
- the plug receives high heat and high surface pressure from the round billet in order to pierce a high-temperature round billet or stretch and roll the diameter. Therefore, the plug surface is worn or seized. Wear and seizure shorten the life of the plug.
- Patent Document 1 In order to improve the life of the plug, a technique for forming a sprayed coating on the surface of the plug has been proposed.
- Patent Document 1 a sprayed coating is formed by arc spraying an iron wire on the surface of a plug.
- Patent Document 1 describes that the thermal spray coating increases the seizure resistance of the plug and improves the service life.
- the thermal spray coating may have poor adhesion to the plug body.
- the adhesion is weak, the sprayed coating is peeled off. If the thermal spray coating is peeled off, the inner surface flaws of the hollow shell are likely to occur. In addition, the life of the plug is reduced.
- An object of the present invention is to provide a method for manufacturing a plug having a thermal spray coating that is difficult to peel off.
- the method of manufacturing a plug for hot pipe production includes a step of preparing a plug having a thermal spray coating containing iron and iron oxide formed on the surface, and a plug at 400 to 550 ° C. for 5 to 60 ° C. And a heat treatment step for holding the portion.
- the plug manufacturing method according to the present embodiment can manufacture a plug in which the thermal spray coating is difficult to peel off.
- FIG. 1 is a longitudinal sectional view of a plug according to the present embodiment.
- FIG. 2 is a graph showing the relationship between the heat treatment temperature and the ratio of iron and iron oxide in the coating.
- FIG. 3 is a cross-sectional view of a test piece used in the test for measuring the tensile residual stress in the thermal spray coating of the plug.
- FIG. 4 is a schematic diagram for explaining a method of measuring tensile residual stress using the test piece shown in FIG.
- the plug manufacturing method includes a step of preparing a plug having a thermal spray coating containing iron and iron oxide formed on the surface, and a heat treatment in which the plug is held at 400 to 550 ° C. for 5 to 60 minutes. A process.
- the iron oxide in the sprayed coating of the prepared plug is mainly wustite (FeO).
- the adhesion of wustite is relatively low.
- the plug on which such a sprayed coating is formed is held at 400 to 550 ° C. for 5 to 60 minutes, the wustite in the sprayed coating is transformed into magnetite (Fe 3 O 4 ).
- the adhesion of magnetite is higher than that of wustite. For this reason, the adhesion of the sprayed coating to the plug body is improved and it is difficult to peel off.
- tensile residual stress remains in the thermal spray coating formed on the surface of the plug body by thermal spraying. If a plug with residual tensile stress remaining on the thermal spray coating is used for piercing and rolling, the thermal spray coating is easily peeled off by the residual tensile stress.
- the plug on which the sprayed coating is formed is heat-treated under the above conditions (400 to 550 ° C., 5 to 60 minutes). Therefore, the tensile residual stress in the thermal spray coating is reduced, and the thermal spray coating is difficult to peel off.
- the plug manufacturing method according to the present embodiment manufactures a plug for hot pipe making.
- the plug for hot pipe making can be used for a punch (piercer) and an elongator.
- the plug manufacturing method of the present embodiment includes a step of preparing a plug having a thermal spray coating (preparation step) and a step of heat-treating the plug (heat treatment step).
- the plug 10 includes a plug body 11 and a sprayed coating 12.
- the plug body 11 has, for example, a known shape and material.
- the thermal spray coating 12 contains iron (Fe) and iron oxide.
- the sprayed coating 12 is made of iron, iron oxide, and impurities.
- the thermal spray coating 12 made of iron, iron oxide and impurities is formed, for example, by arc spraying as follows. An iron wire material to be a thermal spray material and an arc spray device are prepared. The arc spraying device includes a spray nozzle. The thermal spray nozzle blows out the thermal spray material melted by the arc with compressed air or nitrogen gas.
- the iron wire is arc sprayed by an arc spraying apparatus to form a sprayed coating 12 on the surface of the plug body 11.
- the thermal spray distance is, for example, 200 to 1000 mm.
- the arc spray device can adjust the position of the spray nozzle.
- the thermal spray coating 12 may be formed by thermal spraying other than the above-described arc thermal spraying.
- the thermal spray coating 12 contains iron as a matrix and iron oxide, it has wear resistance and heat shielding properties. Therefore, wear and melting damage of the plug body 11 are suppressed.
- the iron oxide in the thermal spray coating 12 formed by thermal spraying is mainly wustite (FeO).
- the adhesion of the wustite to the plug body 11 is low. Therefore, the sprayed coating 12 may be peeled off from the plug body 11.
- the thermal spray coating 12 is formed by thermal spraying, the tensile residual stress remains in the thermal spray coating 12 after being cooled. The tensile residual stress reduces the adhesion of the thermal spray coating 12. Therefore, the thermal spray coating 12 is easily peeled off from the plug body 11 due to the tensile residual stress.
- the following heat treatment step is performed.
- Heat treatment is performed on the prepared plug 10, that is, the plug 10 after the thermal spray coating 12 is formed by thermal spraying. Specifically, the plug 10 is charged into a heat treatment furnace. The temperature inside the heat treatment furnace is set to 400 to 550 ° C. As a result, the temperature of the plug 10 charged in the heat treatment furnace becomes 400 to 550 ° C. In the heat treatment furnace, the temperature of the plug 10 is maintained at 400 to 550 ° C. for 5 to 60 minutes. After the holding time has elapsed, the plug 10 is extracted from the heat treatment furnace.
- Iron oxides include wustite (FeO), magnetite (Fe 3 O 4 ), and hematite (Fe 2 O 3 ).
- magnetite has the highest adhesion with the plug body 11 because it has better consistency with iron than wustite and hematite.
- the heat shielding properties of magnetite are equivalent to wustite and hematite. Therefore, in order to improve the adhesion of the sprayed coating of the plug 10, it is preferable to increase the magnetite ratio in the iron oxide of the sprayed coating.
- the heat treatment temperature to 400 to 550 ° C. and the heat treatment time to 5 to 60 minutes, the wustite ratio in the sprayed coating can be reduced and the magnetite ratio can be increased.
- FIG. 2 is a graph showing the relationship between the heat treatment temperature and the ratio of iron and each iron oxide (wustite, magnetite and hematite) as a matrix in the coating.
- FIG. 2 was obtained by the following method.
- a plurality of thick plate test materials (all 20 mm ⁇ 50 mm ⁇ 10 mm) were prepared. Each test material was subjected to arc spraying under the same conditions using an iron wire material having the same composition, and a sprayed coating having the same thickness (500 ⁇ m) was formed on each test material.
- the composition of the thermal spray coating of each test material was analyzed. Specifically, the peak intensity of iron and each iron oxide (wustite, magnetite, hematite) in the sprayed coating of each test material was determined by an X-ray diffraction method (XRD method). For the sake of convenience, the maximum peak height of the obtained peak intensities was used as an index for the ratio of iron and each iron oxide in the thermal spray coating. The ratio of iron and each iron oxide in the sprayed coating of each test material as sprayed was the same.
- the heat treatment temperature was 400 to 650 ° C., and the heat treatment time was 60 minutes.
- the vertical axis in FIG. 2 is the peak intensity ratio of iron and each iron oxide.
- the peak intensity ratio is high, it means that the ratio in the sprayed coating is large.
- the peak intensity ratio of magnetite significantly increased and the peak intensity ratio of iron (Fe) increased as the temperature increased.
- the iron ratio rapidly decreases and the hematite ratio increases as the heat treatment temperature increases. It is thought that the iron ratio decreased because the oxidation of the thermal spray coating itself progressed and the iron in the thermal spray coating transformed to hematite.
- the heat treatment temperature is 400 ° C. to 550 ° C.
- the magnetite ratio and the iron ratio that enhance the adhesion with the plug body 11 in the sprayed coating 12 are increased.
- the adhesion of the thermal spray coating 12 to the plug body 11 is enhanced.
- a plurality of test pieces 20 shown in FIG. 3 were prepared. Each test piece 20 was provided with a base 21, a base material 22, a thermal spray coating 23, and a plurality of bolts 24.
- the base 21 was 20 mm wide ⁇ 50 mm long ⁇ 10 mm thick.
- the base material 22 was disposed on the upper surface of the base 21.
- the shape of the base material 22 was 20 mm wide ⁇ 50 mm long ⁇ 1 mm thick.
- both end portions (opposite side portions) of the base material 22 were fixed to the base 21 with bolts 24.
- a thermal spray coating 23 was formed on the upper surface of the base material 22.
- the thermal spray coating 23 was formed by arc spraying, and the conditions were the same as those obtained when FIG. 1 was obtained, and the thickness was 500 ⁇ m.
- One test piece 20 is not subjected to heat treatment, and the other plural test pieces 20 are subjected to various heat treatment temperatures (400 to 650 ° C.) and heat treatment times (5 to 70 minutes) shown in Table 1.
- the heat treatment was carried out.
- One side of the bolt 24 fixed to both end portions of the unheat-treated test piece 20 and the heat-treated test piece 20 was removed as shown in FIG.
- the base material 22 and the thermal spray coating 23 were bent due to the tensile residual stress. Therefore, as shown in FIG. 4, the distance from the upper surface of the base 21 to the edge of the lower surface of the base material 22 is defined as a deflection amount FL (mm).
- the deflection amount FL is an index of the tensile residual stress, and it was judged that the tensile residual stress was larger as the deflection amount was larger.
- the deflection amount FL was smaller and the tensile residual stress was reduced than in the test piece 20 which was not subjected to the heat treatment. Furthermore, in the test piece 20 which heat-processed, the tensile residual stress reduced, so that heat processing time was long.
- the magnetite ratio in the thermal spray coating 12 increases, thereby increasing the adhesion of the thermal spray coating 12 to the plug body 11. Furthermore, the tensile residual stress of the thermal spray coating 12 is also reduced. Therefore, in the plug 10 that has been heat-treated under the above-described conditions, the sprayed coating 12 is difficult to peel off from the plug body 11.
- the heat treatment time is 5 to 60 minutes.
- the lower limit of the preferable heat treatment time is 10 minutes, and more preferably 20 minutes.
- a preferable heat treatment temperature is 500 ° C. ⁇ 25 ° C. (475 to 525 ° C.).
- the adhesion of the thermal spray coating 12 to the plug body 11 is enhanced. Therefore, the sprayed coating 12 is difficult to peel off.
- the thermal spray coating 12 contains iron and iron oxide.
- the sprayed coating 12 may further contain other oxides.
- the thermal spray coating 12 may contain W oxide (WO 3 ) together with iron oxide.
- the thermal spray coating 12 contains iron, iron oxide, and W oxide by arc spraying an iron wire containing W. Even if the plug is formed with such a thermal spray coating, the magnetite ratio in the thermal spray coating increases and the tensile residual stress decreases if the heat treatment step is performed. Therefore, the sprayed coating is difficult to peel off.
- the plug having the thermal spray coating was heat-treated under the conditions of test numbers 1 to 20 shown in Table 2.
- the peel resistance of the sprayed coating of the manufactured plug was evaluated.
- Each plug of each test number had the shape shown in FIG. A thermal spray coating having a thickness of 600 ⁇ m was formed on the surface of each plug. The thermal spray coating was formed by arc spraying an iron wire. The arc spraying conditions for each plug were the same. Ten plugs were prepared for each test number.
- the round billet was pierced and rolled using the plugs of test numbers 1 to 20.
- the round billet had a chemical composition corresponding to JIS standard SUS304, and both the diameter and the length were the same.
- Three round billets were pierced and rolled using each plug of each test number. At this time, the heating conditions and the piercing and rolling conditions for each round billet were the same for all test numbers.
- Peeling rate number of plugs confirmed to be peeled / 10 ⁇ 100
- the peel rate (%) the ratio of plugs that were confirmed to be peeled out of the 10 plugs of each test number.
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Abstract
Description
本実施形態によるプラグの製造方法は、熱間製管用のプラグを製造する。熱間製管用のプラグは、穿孔機(ピアサ)及びエロンゲータに利用可能である。本実施形態のプラグの製造方法は、溶射皮膜を有するプラグを準備する工程(準備工程)と、そのプラグを熱処理する工程(熱処理工程)とを備える。
準備工程では、図1に示すようなプラグ10を準備する。
準備されたプラグ10、つまり、溶射により溶射皮膜12を形成した後のプラグ10に対して熱処理を実施する。具体的には、プラグ10を熱処理炉に装入する。熱処理炉の炉内温度を400~550℃にする。これにより、熱処理炉に装入されたプラグ10の温度は400~550℃になる。熱処理炉内において、プラグ10の温度を400~550℃で5~60分保持する。保持時間が経過した後、プラグ10を熱処理炉から抽出する。
鉄酸化物には、ウスタイト(FeO)、マグネタイト(Fe3O4)及びヘマタイト(Fe2O3)がある。このうち、マグネタイトはウスタイト及びヘマタイトよりも鉄との整合性がよいため、プラグ本体11との密着性が最も高い。さらに、マグネタイトの遮熱性は、ウスタイト及びヘマタイトと同等である。したがって、プラグ10の溶射皮膜の密着性を高めるには、溶射皮膜の鉄酸化物中におけるマグネタイト比率を高めるのが好ましい。
ピーク強度比率=鉄及び各鉄酸化物それぞれの最大ピーク高さ/鉄及び各鉄酸化物の最大ピーク高さの総和
4FeO→Fe+Fe3O4
400~550℃で熱処理すればさらに、溶射皮膜中の引張残留応力は低くなる。表1は、各条件(熱処理温度、熱処理時間)で熱処理した場合の、引張残留応力の程度(たわみ量)を示す。表1は次の方法により得られた。
各試験番号のプラグは、いずれも図1に示す形状を有した。各プラグの表面には、厚さ600μmの溶射皮膜が形成された。溶射皮膜は鉄線材をアーク溶射して形成した。各プラグのアーク溶射の条件はいずれも同じとした。各試験番号ごとに10個のプラグを準備した。
剥離率=剥離が確認されたプラグの個数/10×100
表2を参照して、試験番号3~6、8~11及び13~16では、いずれも熱処理温度が400~550℃の範囲内であり、熱処理時間が5~60分の範囲内であった。そのため、剥離率は30%以下と低かった。
Claims (2)
- 熱間製管用のプラグの製造方法であって、
鉄と、鉄酸化物とを含有する溶射皮膜が表面に形成されたプラグを準備する工程と、
前記プラグを、400~550℃で5~60分保持する熱処理工程とを備える、プラグの製造方法。 - 請求項1に記載のプラグの製造方法であってさらに、
前記プラグを準備する工程は、
プラグ本体を準備する工程と、
前記プラグ本体の表面に、鉄線材でアーク溶射を実施して前記溶射皮膜を形成する工程とを含む、プラグの製造方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13777664.7A EP2839891B1 (en) | 2012-04-19 | 2013-03-06 | Method for producing plug for heat formed pipe |
US14/394,745 US20150125630A1 (en) | 2012-04-19 | 2013-03-06 | Method for producing a plug for hot tube-making |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012095434A JP5566417B2 (ja) | 2012-04-19 | 2012-04-19 | 穿孔プラグの製造方法 |
JP2012-095434 | 2012-04-19 |
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WO2013157312A1 true WO2013157312A1 (ja) | 2013-10-24 |
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US (1) | US20150125630A1 (ja) |
EP (1) | EP2839891B1 (ja) |
JP (1) | JP5566417B2 (ja) |
WO (1) | WO2013157312A1 (ja) |
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BR112017028060B1 (pt) | 2015-09-25 | 2023-02-07 | Nippon Steel Corporation | Pino perfurador e método para sua fabricação |
JP6540441B2 (ja) * | 2015-10-06 | 2019-07-10 | 日本製鉄株式会社 | プラグの製造方法 |
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- 2012-04-19 JP JP2012095434A patent/JP5566417B2/ja active Active
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2013
- 2013-03-06 EP EP13777664.7A patent/EP2839891B1/en not_active Not-in-force
- 2013-03-06 WO PCT/JP2013/056063 patent/WO2013157312A1/ja active Application Filing
- 2013-03-06 US US14/394,745 patent/US20150125630A1/en not_active Abandoned
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See also references of EP2839891A4 |
Also Published As
Publication number | Publication date |
---|---|
EP2839891B1 (en) | 2016-08-24 |
JP5566417B2 (ja) | 2014-08-06 |
US20150125630A1 (en) | 2015-05-07 |
EP2839891A1 (en) | 2015-02-25 |
EP2839891A4 (en) | 2015-11-25 |
JP2013248619A (ja) | 2013-12-12 |
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