WO2016139931A1 - シーム部が識別可能な電縫鋼管及びその製造方法 - Google Patents

シーム部が識別可能な電縫鋼管及びその製造方法 Download PDF

Info

Publication number
WO2016139931A1
WO2016139931A1 PCT/JP2016/001098 JP2016001098W WO2016139931A1 WO 2016139931 A1 WO2016139931 A1 WO 2016139931A1 JP 2016001098 W JP2016001098 W JP 2016001098W WO 2016139931 A1 WO2016139931 A1 WO 2016139931A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel pipe
seam
bead
color difference
electric resistance
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.)
Ceased
Application number
PCT/JP2016/001098
Other languages
English (en)
French (fr)
Inventor
信作 小久保
謙一 岩崎
弘道 堀
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.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to US15/555,401 priority Critical patent/US10369655B2/en
Priority to JP2016533677A priority patent/JP6233516B2/ja
Priority to KR1020177023827A priority patent/KR101954698B1/ko
Priority to MX2017011145A priority patent/MX2017011145A/es
Priority to CN201680013025.2A priority patent/CN107405659B/zh
Publication of WO2016139931A1 publication Critical patent/WO2016139931A1/ja
Anticipated expiration legal-status Critical
Priority to US16/403,731 priority patent/US11045896B2/en
Ceased legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/36—Auxiliary equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles by means of mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/30—Finishing tubes, e.g. sizing, burnishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/08—Seam welding not restricted to one of the preceding subgroups
    • B23K11/087—Seam welding not restricted to one of the preceding subgroups for rectilinear seams
    • B23K11/0873—Seam welding not restricted to one of the preceding subgroups for rectilinear seams of the longitudinal seam of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00
    • B23K31/10—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00 relating to cutting or desurfacing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
    • F16L9/165—Rigid pipes wound from sheets or strips, with or without reinforcement of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/17—Rigid pipes obtained by bending a sheet longitudinally and connecting the edges
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations

Definitions

  • the present invention relates to an electric resistance welded steel pipe capable of identifying a seam portion, which can be identified in a final product, and a manufacturing method thereof.
  • the pipe making process for producing an electric resistance steel pipe rolls the width of the band steel 1 while continuously feeding the band steel 1. 2, both ends of the rounded width are joined by electro-welding 3 to form a steel pipe 4, and the outer surface bead formed on the pipe outer surface side of the seam portion 5, which is the joined portion, is removed by cutting.
  • the outer surface bead cutting 6 is performed.
  • inner surface bead cutting 7 is performed to cut and remove the inner surface bead that is formed on the inner surface side of the pipe of the seam portion 5.
  • the combined use of the outer bead cutting 6 and the inner bead cutting 7 is called inner / outer bead cutting.
  • the ERW steel pipe was adapted to each processing form when it was subjected to secondary processing such as plastic processing such as bending processing and pipe length welding of the plate end and the pipe outer surface of the separately prepared plate material. In many cases, it is necessary to arrange and process the seam portion at the optimum position. It is desired that the steel pipe 4 for such secondary processing applications can identify the seam portion at the processing site.
  • the seam is identified visually or magnetically. However, these have the following difficulties.
  • the electro-welded welded portion as it is made of pipe is discolored in black compared to other portions due to oxidation, so that the black portion can be identified as a seam portion.
  • heat treatment such as tempering is performed after pipe making, the entire surface of the tube body turns black, and the seam portion cannot be identified.
  • the seam portion has an outer surface portion that has undergone the outer surface bead cutting, which is recessed as compared with other portions, and since this recess can be recognized even after heat treatment, it can be identified as a seam portion by recognizing the recess after heat treatment. .
  • the outer peripheral shape of the tube body is made uniform and the dent cannot be recognized, and the seam portion after the tube drawing cannot be identified.
  • the seam portion at the stage of pipe formation has a magnetic characteristic difference due to the difference in metal structure with other portions
  • the seam portion can be identified by detecting the magnetic characteristic difference.
  • heat treatment such as tempering is performed after pipe making, the difference in the metal structure is eliminated, so that the difference in magnetic characteristics cannot be detected, and the seam portion cannot be identified.
  • the unevenness-treated portion remains after the heat treatment and after the tube drawing by the rolling tool, so that it is easy to identify the seam portion at the secondary processing site using this as a mark.
  • the eddy current inspection inspection (hereinafter referred to as the nondestructive inspection method generally used in the downstream inspection process) , Abbreviated as ECT).
  • ECT eddy current inspection inspection
  • the tube body is bent or flattened by pressing the rolling tool against the cutting surface on the tube outer surface side.
  • the inner bead cutting may be performed together with the outer bead cutting.
  • the cutting tool used for the inner surface bead cutting and the inner surface of the tube excessively interfere with each other, leading to excessive thinning or damage to the cutting tool.
  • the present invention has no adverse effect on the electric sewing tube process and no adverse effect on the post-tube forming inspection process. It is an object of the present invention to provide an electric-welded steel pipe capable of identifying a seam portion and a manufacturing method thereof, in which a seam portion can be identified due to a color difference from the remaining portion.
  • a part of the outer surface bead is cut and the whole inner surface bead is cut, and the convex height h of the convex part, which is the remaining part to be cut, is set to 0. of the non-bead part thickness t of the steel pipe.
  • the seam part is characterized by being 0.7 times or more and 1.7 times or less. Possible manufacturing method of ERW steel pipe.
  • the present invention since there is no pressing of the rolling tool, there is no adverse effect on the electric sewing pipe process and no adverse effect on the inspection process after the pipe forming, and bead cutting of the steel pipe after cold drawing.
  • the color difference of the film that can be seen from the outer surface side of the tube appears in the portion and the remaining portion, and the seam portion can be easily identified visually.
  • FIG. 1 is a schematic diagram of a cross section in the vicinity of a seam portion showing an example of an ERW steel pipe that can identify the seam portion according to the present invention.
  • FIG. 2 is a schematic view of a cross section in the vicinity of the seam portion after inner and outer surface bead cutting showing an example of a method for manufacturing an electric resistance welded steel pipe capable of identifying the seam portion according to the present invention.
  • FIG. 3 is a schematic view showing an example of an electric sewing tube process.
  • an electric resistance welded steel pipe 100 in which a seam part according to the present invention is identifiable covers a steel pipe part 10 having a seam part 5 formed by electric resistance welding and at least the outer surface side of the steel pipe part 10.
  • the portion within the thickness range is a color difference portion 20 that is a portion where the color difference from the remaining portion (portion other than the pipe circumferential width W) can be visually recognized.
  • the color difference portion 20 has a color difference from the remaining portion due to the film portion 11 at the bead cutting site being subjected to a greater reduction during cold drawing. Due to the presence of the color difference portion 20, the ERW steel pipe 100 that can identify the seam portion according to the present invention can easily visually identify the position of the seam portion 5 on the pipe outer surface side.
  • a preferable manufacturing method for obtaining the ERW steel pipe 100 is as follows. That is, such a manufacturing method is obtained by rounding the width of the steel strip by roll forming while continuously feeding the steel strip, joining both ends in the width direction of the rounded steel strip by electro-welding, and joining the steel strips. After forming a steel pipe having a seam portion, cutting the inner and outer surfaces of the steel pipe by the bead cutting (the electric sewing pipe step), and then applying a zinc phosphate coating on at least the outer surface of the steel pipe, the steel pipe And a drawing step of performing cold drawing using a plug and a die.
  • the zinc phosphate coating is applied as a lubricating coating during cold drawing.
  • the preferred manufacturing method for obtaining the electric resistance welded steel pipe 100 further targets the steel pipe 4 (the steel pipe that becomes the steel pipe part 10 after the drawing process), for example, as shown in FIG.
  • the outer bead 8 is partly cut and the inner bead 9 is entirely cut, and the convex height h of the convex part, which is the remaining part to be cut, is defined as ⁇ of the non-bead thickness t of the steel pipe. It is good also as more than twice and below beta times.
  • the pipe circumferential direction portion where the convex portion 12 is located has a larger thickness reduction rate than the remaining pipe circumferential direction portion. For this reason, a greater reduction is applied to the zinc phosphate coating applied to at least the outer surface of the steel pipe 4 (the coating that becomes the coating portion 11 in FIG. 1 after the drawing step).
  • the coating portion 11 a portion that exists directly above the seam portion 5, and the width W in the pipe circumferential direction of the portion is not less than 0.1 times the wall thickness.
  • the part which becomes a range becomes the color difference part 20 which is a part which can visually recognize the color difference with the other part (parts other than the pipe circumferential direction width W) by receiving a larger reduction.
  • the pipe circumferential direction width W becomes the color difference portion 20.
  • the convex height h of the convex portion 12 is set to ⁇ times or more and ⁇ times or less of the non-bead portion thickness t.
  • Such control of the convex height h can be performed by adjusting the blade height position of a cutting tool (cutting tool) used for inner surface bead cutting or outer surface bead cutting.
  • the thickness of the zinc phosphate coating applied before cold drawing may be in the usual range, for example, 1 to 30 ⁇ m.
  • the film is immersed in a zinc phosphate bath.
  • a seam annealer (not shown) (only the seam portion 5 is heated by, for example, a high frequency induction heating method).
  • the seam portion 5 may be subjected to heat treatment (referred to as “seam annealing”).
  • the steel pipe 4 was manufactured by the electric sewing pipe process. In this production, inner and outer surface bead cutting was performed, and at that time, the outer surface bead 8 was all cut and the inner surface bead 9 was partially left. By adjusting the blade height position of the inner surface bead cutting bite, the convex height h of the convex portion 12 which is the uncut portion was varied as shown in Table 1.
  • the seam annealing was performed to obtain a steel pipe having the tube size before the drawing process shown in Table 1.
  • the wall thickness t in the tube size before the drawing process is the non-bead portion wall thickness t.
  • the steel pipe 4 obtained by the electric sewing pipe process was subjected to cold drawing using the plug and the die.
  • the coating thickness which is the thickness of the zinc phosphate coating applied to the outer surface of the steel pipe 4, and the pipe size after the drawing process were as shown in Table 1.
  • the zinc phosphate coating was formed by immersing a steel pipe before cold drawing in a zinc phosphate bath.
  • the film part 11 on the outer surface of the product tube formed by cold drawing was visually observed to determine whether or not the color difference part 20 could identify the seam part.
  • the results are shown in Table 1.
  • a circle mark in the seam part identification column indicates that identification is possible, and a cross mark indicates that identification is not possible.
  • the color difference part 20 was judged visually (it is visually recognizable because it is whiter than the surroundings).
  • the pipe circumferential width W was measured with a caliper.
  • the seam portion 5 can be identified by appearing in the tube axis direction width W.
  • the convex height h of the convex portion 12 is excessively small (h / t is less than ⁇ )
  • the color difference portion 20 does not appear, and the convex height h is excessively large (h / t is ⁇
  • the plug could not be inserted into the inner surface of the tube and cold drawing could not be performed ("drawing is not possible" in the tube size column after the drawing process). Neither appeared, and none of the seam portions could be identified.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

　冷間引抜工程においてビード切削部分とその余の部分との色差が生じてシーム部の識別ができるようになる、シーム部が識別可能な電縫鋼管及びその製造方法を提供する。　電縫溶接してなるシーム部を有する鋼管部と、該鋼管部の少なくとも外面側を覆ったリン酸亜鉛の皮膜部とを有する電縫鋼管であって、前記皮膜部のうち、前記シーム部の直上に存在する部分であって、該部分の管周方向幅Ｗが肉厚の０．１倍以上肉厚以下の範囲となる部分がそれ以外の部分との色の違いが視認できる部分である色差部となっていることを特徴とするシーム部が識別可能な電縫鋼管。

Description

シーム部が識別可能な電縫鋼管及びその製造方法
　本発明は、電縫溶接による接合部であるシーム部の識別が最終製品においてできるようにした、シーム部が識別可能な電縫鋼管及びその製造方法に関する。
　電縫鋼管を製造する造管工程（以下、「電縫造管工程」と云う。）は、例えば図３に示す様に、帯鋼１を連続送りしながら、帯鋼１の幅をロール成形２により丸め、該丸めた幅の両端を電縫溶接３により接合して鋼管４となし、前記接合された部位であるシーム部５の管外面側に形成された盛り上がりである外面ビードを切削除去する外面ビード切削６を行うと云う一連の工程を有する。なお、外面ビード切削６と併せて、シーム部５の管内面側に形成された盛り上がりである内面ビードを切削除去する内面ビード切削７を行う場合もある。外面ビード切削６と内面ビード切削７の併用を内外面ビード切削と云う。
　電縫鋼管は、これに曲げ加工等の塑性加工や、別途用意されている板材の板材端部と管外面との管長方向溶接加工などの二次加工を施すに際し、夫々の加工形態に適応した最適位置にシーム部を配置して加工する必要がある場合が少なくない。斯様な二次加工用途向けの鋼管４は、加工現場でシーム部を識別できるものが望まれる。
　一般に、シーム部の同定は、目視、磁気により行われる。しかしながら、これらには以下の難点があった。
　すなわち、目視による同定では、造管ままの電縫溶接部は、酸化により他の部分と比べ黒く変色しているため、この黒色部がシーム部であると同定できる。しかしながら、造管後に焼戻し等の熱処理を受けると、管体の表面全体が黒く変色し、シーム部の同定は不可能となる。また、シーム部は、前記外面ビード切削を受けた外面部分が他の部分と比べ凹んでおり、この凹みは熱処理後も認識できるので、熱処理後に前記凹みを認識してシーム部であると同定できる。しかしながら、伸管されると、管体の外周形状が均一化されて前記凹みが認識できなくなり、伸管後のシーム部の同定は不可能となる。
　さらに、磁気による同定では、造管ままの段階のシーム部は、他の部分との金属組織の差による磁気特性差があるため、該磁気特性差を検知してシーム部を同定できる。しかしながら、造管後に焼戻し等の熱処理を受けると、前記金属組織の差が解消するため磁気特性差が検知できなくなり、シーム部の同定は不可能となる。
　一方、別段の手段を講じてシーム部を識別できるようにした従来技術として、シーム部の管外面側のビードを切削除去してなる切削面に、例えば転造工具を押し当てて、凹凸処理部を形成すると云う手法（便宜上、従来法と云う）の提案がある（特許文献１参照）。
　従来法によれば、前記転造工具によって凹凸処理部は、熱処理後や伸管後でも消えずに残るから、これを目印として二次加工現場でのシーム部の識別が容易となる。
特開２０１２－４０５８１号公報
　然し、従来法では、シーム部に外面ビード切削を施してなる切削面に凹凸処理部を形成するから、下流の検査工程で一般的に用いられる非破壊検査法である、渦電流探傷検査（以下、ＥＣＴと略号する）により鋼管の管長手方向を探傷方向として傷（欠陥）を探り当てる管長方向ＥＣＴ探傷を行う際に、シーム部と干渉している凹凸処理部が傷として誤検出され、探傷精度を悪化させると云う問題点（造管後の検査工程への悪影響）がある。
　又、従来法では、管外面側の前記切削面への転造工具の押し当てにより、管体は撓み或いは扁平化する。一方、電縫造管工程では、前記外面ビード切削加工と併せて前記内面ビード切削加工を行う場合がある。この場合、前記転造工具の押し当てにより管体が撓み或いは扁平化すると、前記内面ビード切削に用いる切削工具と管内面とが過剰に干渉し、過剰な減肉或いは切削工具の破損を招くと云う問題点（電縫造管工程への悪影響）もある。
　上述の従来法の問題点に鑑み、本発明は、前記電縫造管工程への悪影響及び前記造管後検査工程への悪影響が無くて、その後に行われる冷間引抜においてビード切削部分とその余の部分との色差が生じてシーム部の識別ができるようになる、シーム部が識別可能な電縫鋼管及びその製造方法を提供することを課題とした。
　前記課題を解決するために成された本発明は、以下のとおりである。
（１）　電縫溶接してなるシーム部を有する鋼管部と、該鋼管部の少なくとも外面側を覆ったリン酸亜鉛の皮膜部とを有する電縫鋼管であって、前記皮膜部のうち、前記シーム部の直上に存在する部分であって、該部分の管周方向幅Ｗが肉厚の０．１倍以上肉厚以下の範囲となる部分がそれ以外の部分との色の違いが視認できる部分である色差部となっていることを特徴とするシーム部が識別可能な電縫鋼管。
（２）　前記（１）に記載のシーム部が識別可能な電縫鋼管を製造する方法であって、帯鋼を連続送りしながら、前記帯鋼の幅をロール成形により丸め、該丸めた帯鋼の幅方向両端を電縫溶接により接合し、該接合してなるシーム部を具備した鋼管となし、該鋼管の内外面ビード切削を行い、その後、該鋼管の少なくとも外面にリン酸亜鉛の皮膜を施した後、該鋼管にプラグ及びダイスを用いた冷間引抜を施す工程を有し、前記内外面ビード切削を行う際、外面ビードは全部切削して内面ビードは一部残して切削し、または、外面ビードは一部残して切削して内面ビードは全部切削し、この一部残して切削する残し部分である凸部の凸高さｈを前記鋼管の非ビード部肉厚ｔの０．０７倍以上１．７倍以下とすることを特徴とするシーム部が識別可能な電縫鋼管の製造方法。
　本発明によれば、前記転造工具の押し当ては無いから、前記電縫造管工程への悪影響及び前記造管後の検査工程への悪影響は無くて、冷間引抜後の鋼管のビード切削部分とその余の部分とに、管外面側から視認できる皮膜の色差が現出し、シーム部を目視で容易に識別できるようになる。
図１は、本発明に係るシーム部が識別可能な電縫鋼管の一例を示すシーム部付近の断面の模式図である。 図２は、本発明に係るシーム部が識別可能な電縫鋼管の製造方法の一例を示す内外面ビード切削後のシーム部付近の断面の模式図である。 図３は、電縫造管工程の一例を示す概略図である。
　例えば図１に示すように、本発明に係るシーム部が識別可能な電縫鋼管１００は、電縫溶接してなるシーム部５を有する鋼管部１０と、鋼管部１０の少なくとも外面側を覆ったリン酸亜鉛の皮膜部１１とを有しており、皮膜部１１のうち、シーム部５の直上に存在する部分であって該部分の管周方向幅Ｗが肉厚の０．１倍以上肉厚以下の範囲となる部分は、その余の部分（管周方向幅Ｗ以外の部分）との色の違いが視認できる部分である色差部２０となっている。この色差部２０は、後述するように、冷間引抜時にビード切削部位の皮膜部１１がより大きな圧下を受けたことにより、その余の部分との色の違いを生じたものである。この色差部２０の存在により、本発明に係るシーム部が識別可能な電縫鋼管１００は、シーム部５の管外面側の位置を目視にて容易に識別できる。
　前記電縫鋼管１００を得るための好ましい製造方法は以下のとおりである。すなわち、斯かる製造方法とは、帯鋼を連続送りしながら、前記帯鋼の幅をロール成形により丸め、該丸めた帯鋼の幅方向両端を電縫溶接により接合し、該接合してなるシーム部を具備した鋼管となし、該鋼管の内外面ビード切削を行う工程（前記電縫造管工程）、および、その後、該鋼管の少なくとも外面にリン酸亜鉛の皮膜を施した後、該鋼管にプラグ及びダイスを用いた冷間引抜を施す引抜工程を有するものである。
　前記リン酸亜鉛の皮膜は、前記冷間引抜の際の潤滑用皮膜として施工される。
　前記電縫鋼管１００を得るための好ましい製造方法は、さらに、前記内外面ビード切削を行う際、例えば図２に示すように、鋼管４（引抜工程後は鋼管部１０になる鋼管）を対象とし、内面ビード９は一部残して切削し外面ビード８は全部切削し、この一部残して切削する残し部分である凸部１２の凸高さｈを、前記鋼管の非ビード部肉厚ｔのα倍以上β倍以下（ここで、α＝０．０７、β＝１．７である。）とすることを特徴とする。なお、外面ビード８は一部残して切削し内面ビード９は全部切削し、この一部残して切削する残し部分である凸部の凸高さｈを前記鋼管の非ビード部肉厚ｔのα倍以上β倍以下としてもよい。
　これにより、ダイスとプラグを用いた冷間引抜において、凸部１２所在の管周方向部位は、その余の管周方向部位と比べて、減肉率が大きくなる。このため、鋼管４の少なくとも外面に施されたリン酸亜鉛の皮膜（引抜工程後は図１の皮膜部１１になる皮膜）に、より大きな圧下が加わる。
　その結果、図１に示したように、皮膜部１１のうち、シーム部５の直上に存在する部分であって該部分の管周方向幅Ｗが肉厚の０．１倍以上肉厚以下の範囲となる部分は、より大きな圧下を受けたことにより、その余の部分（管周方向幅Ｗ以外の部分）との色の違いを視認できる部分である色差部２０になる。大きな圧力を加えることで管表面の粗度を細かくし、周りとの色差を生じせしめ、また、肉厚の０．１倍以上肉厚以下の範囲とすることにより、シーム部の視認性を確保することができ、管周方向幅Ｗが色差部２０となる。
　但し、凸部１２の凸高さｈが非ビード部肉厚ｔのα倍未満であると、引抜工程で色差部２０を生じさせる効果に乏しい。又、凸部１２の凸高さｈが非ビード部肉厚ｔのβ倍を超えると、冷間引抜に供することが難しくて、色差部２０を生じさせることが困難である。よって、凸部１２の凸高さｈは、非ビード部肉厚ｔのα倍以上β倍以下とする。斯様な凸高さｈの管理は、内面ビード切削または外面ビード切削に用いる切削工具（切削バイト）の刃高さ位置調整によって行うことができる。
　また、冷間引抜前に施すリン酸亜鉛の皮膜の施工厚さは、常用の範囲、例えば１～３０μｍとすればよい。前記皮膜の施工方法としては、リン酸亜鉛浴に浸漬する。
　なお、前記電縫造管工程においては、内外面ビード切削を行った後、引抜工程に入る前に、必要に応じて、図示しないシームアニーラ（シーム部５のみを、例えば高周波誘導加熱方式で、加熱する装置）にて、シーム部５に熱処理（「シームアニール」と云う。）を施してもよい。
　前記電縫造管工程により鋼管４を製造した。この製造において、内外面ビード切削を行い、その際、外面ビード８は全部切削し、内面ビード９は一部残して切削した。内面ビード切削バイトの刃高さ位置調整により、切削残し部分である凸部１２の凸高さｈを表１に示すとおり種々変えた。
　前記内外面ビード切削の後、前記シームアニールを行い、表１に示す引抜工程前管サイズを有する鋼管を得た。この引抜工程前管サイズにおける肉厚ｔは、前記非ビード部肉厚ｔである。
　前記電縫造管工程により得た鋼管４を、前記プラグとダイスを用いた冷間引抜に供した。このとき鋼管４の外面側に施した前記リン酸亜鉛の皮膜の施工厚さである皮膜施工厚さ、及び引抜工程後の管サイズは表１に示すとおりとした。なお、前記リン酸亜鉛の皮膜は、冷間引抜を施す前の鋼管をリン酸亜鉛浴に浸漬して形成した。
　冷間引抜を施してなる製品管の外面の皮膜部１１を目視観察し、前記色差部２０によるシーム部識別の可否を判定した。その結果を表１に示す。ここでシーム部識別欄の○印は識別可能、×印は識別不能を示す。
　なお、色差部２０は、目視で判断した（周りと比較してより白色のため、視認できる。）。また、管周方向幅Ｗは、ノギスで測定した。
　表１に示すとおり、本発明例（内面ビード切削残し凸部高さｈ/非ビード部肉厚ｔがα＝０．０７以上β＝１．７以下）では前記色差部２０が表１に示す管軸方向幅Ｗで現れてシーム部５の識別が可能であった。これに対し凸部１２の凸高さｈが過小な（ｈ/ｔがα未満である）比較例では前記色差部２０が現れず、又、凸高さｈが過大な（ｈ/ｔがβ超である）比較例では管内面へのプラグ装入ができず冷間引抜が実行不可能（引抜工程後管サイズ欄に「引抜不可能」と記した。）となって前記色差部２０が現れず、何れもシーム部の識別は不能であった。
Figure JPOXMLDOC01-appb-T000001
１　帯鋼
２　ロール成形
３　電縫溶接
４　鋼管（電縫溶接してなるシーム部を有する鋼管）
５　シーム部
６　外面ビード切削
７　内面ビード切削
８　外面ビード
９　内面ビード
１０　鋼管部
１１　皮膜部（リン酸亜鉛の皮膜部）
１２　凸部（内面ビードの切削残し）
２０　色差部
１００　シーム部が識別可能な電縫鋼管

Claims (2)

  1. 　電縫溶接してなるシーム部を有する鋼管部と、該鋼管部の少なくとも外面側を覆ったリン酸亜鉛の皮膜部とを有する電縫鋼管であって、前記皮膜部のうち、前記シーム部の直上に存在する部分であって、該部分の管周方向幅Ｗが肉厚の０．１倍以上肉厚以下の範囲となる部分がそれ以外の部分との色の違いが視認できる部分である色差部となっていることを特徴とするシーム部が識別可能な電縫鋼管。
  2. 　請求項１に記載のシーム部が識別可能な電縫鋼管を製造する方法であって、
    帯鋼を連続送りしながら、前記帯鋼の幅をロール成形により丸め、該丸めた帯鋼の幅方向両端を電縫溶接により接合し、該接合してなるシーム部を具備した鋼管となし、該鋼管の内外面ビード切削を行い、その後、該鋼管の少なくとも外面にリン酸亜鉛の皮膜を施した後、該鋼管にプラグ及びダイスを用いた冷間引抜を施す工程を有し、
    前記内外面ビード切削を行う際、外面ビードは全部切削して内面ビードは一部残して切削し、または、外面ビードは一部残して切削して内面ビードは全部切削し、この一部残して切削する残し部分である凸部の凸高さｈを前記鋼管の非ビード部肉厚ｔの０．０７倍以上１．７倍以下とすることを特徴とするシーム部が識別可能な電縫鋼管の製造方法。
PCT/JP2016/001098 2015-03-03 2016-03-01 シーム部が識別可能な電縫鋼管及びその製造方法 Ceased WO2016139931A1 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US15/555,401 US10369655B2 (en) 2015-03-03 2016-03-01 Electric resistance welded steel pipe having identifiable seam portion and method for manufacturing the same
JP2016533677A JP6233516B2 (ja) 2015-03-03 2016-03-01 シーム部が識別可能な電縫鋼管の製造方法
KR1020177023827A KR101954698B1 (ko) 2015-03-03 2016-03-01 시임부가 식별 가능한 전봉 강관 및 그의 제조 방법
MX2017011145A MX2017011145A (es) 2015-03-03 2016-03-01 Tubo de acero soldado por resistencia electrica que tiene porcion de costura identificable y metodo para la fabricacion del mismo.
CN201680013025.2A CN107405659B (zh) 2015-03-03 2016-03-01 焊缝部能够识别的电焊钢管的制造方法
US16/403,731 US11045896B2 (en) 2015-03-03 2019-05-06 Electric resistance welded steel pipe having identifiable seam portion and method for manufacturing the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-040928 2015-03-03
JP2015040928 2015-03-03

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US15/555,401 A-371-Of-International US10369655B2 (en) 2015-03-03 2016-03-01 Electric resistance welded steel pipe having identifiable seam portion and method for manufacturing the same
US16/403,731 Division US11045896B2 (en) 2015-03-03 2019-05-06 Electric resistance welded steel pipe having identifiable seam portion and method for manufacturing the same

Publications (1)

Publication Number Publication Date
WO2016139931A1 true WO2016139931A1 (ja) 2016-09-09

Family

ID=56849310

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/001098 Ceased WO2016139931A1 (ja) 2015-03-03 2016-03-01 シーム部が識別可能な電縫鋼管及びその製造方法

Country Status (6)

Country Link
US (2) US10369655B2 (ja)
JP (1) JP6233516B2 (ja)
KR (1) KR101954698B1 (ja)
CN (1) CN107405659B (ja)
MX (1) MX2017011145A (ja)
WO (1) WO2016139931A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023124000A1 (de) * 2023-09-06 2025-03-06 Maschinenfabrik Bernard Krone GmbH & Co. KG Bindenadel für eine nadelschwinge einer ballenpresse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54118372A (en) * 1978-03-07 1979-09-13 Sumitomo Metal Ind Ltd Production of cold drawn steel pipe from electrically seamed steel pipe
JPS6393424A (ja) * 1986-10-07 1988-04-23 Nisshin Steel Co Ltd 薄肉電縫管の製造法
JPH04197513A (ja) * 1990-11-27 1992-07-17 Nippon Steel Corp コイル状鋼管の芯引方法
JP2015168003A (ja) * 2014-03-11 2015-09-28 Ｊｆｅスチール株式会社 電縫鋼管及びその製造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2139771A (en) * 1932-11-03 1938-12-13 Midland Steel Prod Co Method and apparatus for welding
US3716908A (en) * 1971-09-27 1973-02-20 Anaconda American Brass Co Method for welding
US5604040A (en) * 1991-08-09 1997-02-18 Associated Universities, Inc. Zinc phosphate conversion coatings
US7157672B2 (en) * 2003-05-20 2007-01-02 Gandy Technologies Corporation Method of manufacturing stainless steel pipe for use in piping systems
JP2005125385A (ja) 2003-10-24 2005-05-19 Toshida Kogyo Kk 電縫管の内面ビード削除方法及び装置
CN101148012A (zh) 2007-10-15 2008-03-26 胜利油田孚瑞特石油装备有限责任公司 空心抽油杆的加工方法
US8365602B2 (en) * 2009-10-09 2013-02-05 Olympus Ndt, Inc. Weld seam tracking system using phased array ultrasonic devices
JP5771821B2 (ja) 2010-08-17 2015-09-02 日鉄住金鋼管株式会社 電縫鋼管、電縫鋼管の製造方法、管状製品の製造方法
JP5994760B2 (ja) * 2013-10-08 2016-09-21 Ｊｆｅスチール株式会社 電縫鋼管の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54118372A (en) * 1978-03-07 1979-09-13 Sumitomo Metal Ind Ltd Production of cold drawn steel pipe from electrically seamed steel pipe
JPS6393424A (ja) * 1986-10-07 1988-04-23 Nisshin Steel Co Ltd 薄肉電縫管の製造法
JPH04197513A (ja) * 1990-11-27 1992-07-17 Nippon Steel Corp コイル状鋼管の芯引方法
JP2015168003A (ja) * 2014-03-11 2015-09-28 Ｊｆｅスチール株式会社 電縫鋼管及びその製造方法

Also Published As

Publication number Publication date
KR20170107075A (ko) 2017-09-22
US10369655B2 (en) 2019-08-06
KR101954698B1 (ko) 2019-03-06
JP6233516B2 (ja) 2017-11-22
US20190255646A1 (en) 2019-08-22
US11045896B2 (en) 2021-06-29
CN107405659B (zh) 2019-06-07
JPWO2016139931A1 (ja) 2017-04-27
CN107405659A (zh) 2017-11-28
US20180036830A1 (en) 2018-02-08
MX2017011145A (es) 2017-11-28

Similar Documents

Publication Publication Date Title
CA2640235C (en) Method of manufacturing lined tubing
JP2014004626A (ja) 異径管状部品の製造方法および成形金型
JP6015686B2 (ja) 電縫鋼管の製造方法
JP6233516B2 (ja) シーム部が識別可能な電縫鋼管の製造方法
US11712727B2 (en) Bend pipe and method for manufacturing same
JP6083402B2 (ja) 電縫鋼管の製造方法
JP5803606B2 (ja) 電縫管の製造方法及びローレット加工治具
JP5994760B2 (ja) 電縫鋼管の製造方法
JP2004148337A (ja) 溶接鋼管の接合部成形方法及びその製造装置
JP2007253331A (ja) プレス成形用クラッド材及びそのクラッド材によってプレス成形されたシームレス缶
JPS63224814A (ja) 車輪のリム用溶接鋼管の製造方法
JP5884750B2 (ja) 電縫鋼管の接合部成形方法及びその製造装置
JP2004114101A (ja) 電縫鋼管の管内面平滑化方法および装置
JP4779465B2 (ja) 鋼管の曲がり防止方法
JP5055843B2 (ja) 溶接部特性の良好な電縫管の製造方法
JP6127709B2 (ja) プレス切断用電縫管及びその製造方法
JPH10328729A (ja) 内面溝付伝熱管の製造方法
JP2007245218A (ja) Ｕプレス装置およびｕプレス方法
JP2010137231A (ja) 加工性の良好な鍛接管
JP2011115820A (ja) フレア加工後の面が良好な鍛接鋼管
JP2007090416A (ja) 溶接部特性の良好な電縫管製造方法
JPS63252628A (ja) 自動車用車輪のリムの製造方法
JP2007090414A (ja) 溶接部特性の良好な電縫管製造方法
JP2008012581A (ja) 溶接部特性の良好な電縫管の製造方法
JP2013154402A (ja) 加工性の良好な鍛接管

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2016533677

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16758629

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20177023827

Country of ref document: KR

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: MX/A/2017/011145

Country of ref document: MX

WWE Wipo information: entry into national phase

Ref document number: 15555401

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16758629

Country of ref document: EP

Kind code of ref document: A1