EP2839891B1 - Method for producing plug for heat formed pipe - Google Patents

Method for producing plug for heat formed pipe Download PDF

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Publication number
EP2839891B1
EP2839891B1 EP13777664.7A EP13777664A EP2839891B1 EP 2839891 B1 EP2839891 B1 EP 2839891B1 EP 13777664 A EP13777664 A EP 13777664A EP 2839891 B1 EP2839891 B1 EP 2839891B1
Authority
EP
European Patent Office
Prior art keywords
plug
sprayed coating
heat treatment
iron
magnetite
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.)
Not-in-force
Application number
EP13777664.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2839891A1 (en
EP2839891A4 (en
Inventor
Yasuyoshi Hidaka
Yasuto Higashida
Kazuhiro Shimoda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel and Sumitomo Metal Corp
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 Nippon Steel and Sumitomo Metal Corp filed Critical Nippon Steel and Sumitomo Metal Corp
Publication of EP2839891A1 publication Critical patent/EP2839891A1/en
Publication of EP2839891A4 publication Critical patent/EP2839891A4/en
Application granted granted Critical
Publication of EP2839891B1 publication Critical patent/EP2839891B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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 producing a plug for hot tube-making (hereafter simply referred to as a plug), and more particularly to a method for producing a plug included in a piercer and an elongator.
  • the Mannesmann tube-making process is widely adopted as the method for producing seamless tubes.
  • a round billet heated to around 1200°C is piercing-rolled by a piercer.
  • the piercer includes a pair of inclined rolls and a plug.
  • the plug is disposed between the inclined rolls of the pair and on a pass line.
  • the piercer presses the round billet onto the plug while rotating the round billet in the circumferential direction by means of the inclined rolls, to piercing-roll the round billet into a hollow shell.
  • the elongator elongates the hollow shell to expand the diameter and reduce the thickness thereof.
  • the elongator has a similar configuration to that of the piercer, that is, a pair of inclined rolls and a plug.
  • the plug since the plug is used for piercing, and elongating a round billet of high temperature to expand the diameter thereof, the plug is subject to high temperature and high interfacial pressure from the round billet. As a result, the surface of the plug is subject to wear and scoring. Such wear and scoring will reduce the life of the plug.
  • Patent Document 1 arc spraying is performed with iron wire rod onto the surface of the plug to form a sprayed coating.
  • Patent Document 1 describes that the sprayed coating improves the scoring resistance of the plug thereby increasing the life thereof.
  • the sprayed coating may have a poor adhesiveness to the plug body. Poor adhesiveness will cause the sprayed coating to peel off. If the sprayed coating peels off, inner surface flaws of the hollow shell become more likely to occur. Moreover, the life of the plug will also decline.
  • a method for producing a plug for hot tube-making includes a step of preparing a plug whose surface includes a sprayed coating formed thereon, the sprayed coating containing iron and an iron oxide; and a heat treatment step during which the plug is kept at 400°C to 550°C for 5 to 60 minutes.
  • the method for producing a plug according to the present embodiment can produce a plug whose sprayed coating is less likely to peel off.
  • the method for producing a plug according to the present embodiment includes a step of preparing a plug whose surface includes a sprayed coating formed thereon, the sprayed film containing iron and an iron oxide; and a heat treatment step during which the plug is kept at 400°C to 550°C for 5 to 60 minutes.
  • the iron oxide in the prepared sprayed coating of the plug is composed dominantly of wustite (FeO). Wustite has a relatively low adhesiveness. Retaining the plug, on which such sprayed coating is formed, at 400°C to 550°C for 5 to 60 minutes causes the wustite in the sprayed coating to transform into magnetite (Fe 2 O 3 ). Magnetite has a higher adhesiveness than that of wustite. Therefore, the adhesiveness of the sprayed coating to the plug body is improved, and the sprayed coating becomes less likely to peel off.
  • FeO wustite
  • the plug including a sprayed coating formed thereon is subjected to a heat treatment at the above described conditions (at 400°C to 550°C for 5 to 60 minutes). As a result, the tensile residual stress in the sprayed coating is reduced, and the sprayed coating becomes less likely to peel off.
  • the method for producing a plug according to the present embodiment produces a plug for hot tube-making.
  • the plug for hot tube-making can be utilized for a piercer and an elongator.
  • the method for producing a plug of the present embodiment includes a step (preparation step) of preparing a plug having a sprayed coating, and a step (heat treatment step) of heat treating the plug.
  • a plug 10 as shown in Figure 1 is prepared.
  • the plug 10 includes a plug body 11 and a sprayed coating 12.
  • the plug body 11 has, for example, a well-known shape and material.
  • the sprayed coating 12 contains iron (Fe) and an iron oxide.
  • the sprayed coating 12 consists of iron, an iron oxide, and impurities.
  • the sprayed coating 12 consisting of iron, an iron oxide, and impurities is formed by, for example, arc spraying as follows.
  • An iron wire rod which provides a spraying material, and an arc spraying apparatus are prepared.
  • the arc spraying apparatus includes a spraying nozzle. The spraying nozzle blows out the spraying material which is melted by arc, with compressed air or nitrogen gas.
  • the iron wire rod is arc sprayed by the arc spraying apparatus to form a sprayed coating 12 on the surface of the plug body 11.
  • a spraying distance between the spraying nozzle of the arc spraying apparatus and the plug body 11
  • the spraying distance is, for example, 200 to 1000 mm.
  • the arc spraying apparatus can adjust the position of the spraying nozzle.
  • the sprayed coating 12 may be formed by other spraying processes than the above described arc spraying.
  • the sprayed coating 12 contains iron, which provides the matrix, and an iron oxide, it has wear resistance and thermal insulation performance. Thereby, the wear and melting loss of the plug body 11 are suppressed.
  • the iron oxide in the sprayed coating 12 formed by spraying is mostly wustite (FeO). Wustite has poor adhesiveness to the plug body 11. Therefore, the sprayed coating 12 may peel off from the plug body 11. Further, since the sprayed coating 12 is formed by spraying, tensile residual stress remains in the sprayed coating 12 after it is cooled. The tensile residual stress reduces the adhesiveness of the sprayed coating 12. Thereby, the tensile residual stress makes the sprayed coating 12 more likely to peel off from the plug body 11.
  • FeO wustite
  • Heat treatment is conducted on the prepared plug 10, that is, the plug 10 after the sprayed coating 12 is formed by spraying.
  • the plug 10 is put into a heat treatment furnace.
  • the internal temperature of the heat treatment furnace is kept at 400°C to 550°C.
  • the temperature of the plug 10 put into the heat treatment furnace will become 400°C to 550°C.
  • the temperature of the plug 10 is retained at 400°C to 550°C for 5 to 60 minutes.
  • the plug 10 is taken out from the heat treatment furnace after the retention time has passed.
  • the transformation from wustite to magnetite takes place, and the ratio of magnetite in the sprayed coating 12 increases. Further, the tensile residual stress decreases. Thereby, the adhesiveness of the sprayed coating 12 to the plug body 11 increases, and the sprayed coating 12 becomes less likely to peel off.
  • such operation will be described in detail.
  • the iron oxide includes wustite (FeO), magnetite (Fe 3 O 4 ), and hematite (Fe 2 O 3 ).
  • magnetite since magnetite is more consistent with iron than wustite and hematite are, magnetite has a highest adhesiveness with the plug body 11. Further, the heat insulation performance of magnetite is equal to those of wustite and hematite. Therefore, to increase the adhesiveness of the sprayed coating of the plug 10, it is preferable to increase the ratio of magnetite in the iron oxide of the sprayed coating.
  • Figure 2 is a diagram showing the relationship between the heat treatment temperature and the proportions of iron, which is the matrix, and each iron oxide (wustite, magnetite, and hematite) in the coating.
  • Figure 2 was resulted from the following method.
  • a plurality of thick plate test specimens (each of which has dimensions of 20 mm ⁇ 50 mm ⁇ 10 mm) were prepared.
  • arc spraying was performed at the same condition by using an iron wire rod having the same composition, to form a sprayed coating of the same thickness (500 ⁇ m) in each test specimen.
  • the composition of the sprayed coating of each test specimen was analyzed.
  • XRD method X-ray diffraction method
  • peak intensities of iron and each oxide (wustite, magnetite, and hematite) in the sprayed coating of each test specimen were determined.
  • the heights of maximum peaks out of the obtained peak intensities were used as the indices for the ratios of iron and each iron oxide in the sprayed coating.
  • the ratios of iron and each iron oxide in the sprayed coating of each test specimen as sprayed were the same for every test specimen.
  • each test specimen was subjected to heat treatment.
  • the heat treatment temperature was 400°C to 650°C, and the heat treatment time was 60 minutes for every test specimen.
  • the ratios of iron and iron oxides in the sprayed coating were analyzed by an XRD method on the sprayed coating of the test specimens after heat treatment to obtain Figure 2 .
  • the ordinate in Figure 2 indicates peak intensity ratios of iron and each iron oxide.
  • the peak intensity ratio was defined by the following formula.
  • Peak intensity ratio Each maximum peak height of iron and iron oxide/ total of maximum peak heights of iron and each iron oxide
  • a higher peak height ratio means a larger ratio of the content in the sprayed coating.
  • the iron ratio rapidly decreases and the hematite ratio increases as the heat treatment temperature rises.
  • the decrease of the iron ratio is probably due to that the oxidation of the sprayed coating itself has progressed causing the iron in the sprayed coating to transform into hematite.
  • the heat treatment temperature is 400°C to 550°C
  • the magnetite ratio and the iron ratio which increase the adhesiveness with the plug body 11
  • the adhesiveness of the sprayed coating 12 to the plug body 11 will increase.
  • Table 1 shows the level of tensile residual stress (a deflection) when heat treatment is conducted at each condition (heat treatment temperature and heat treatment time). Table 1 was resulted from the following method.
  • a plurality of specimens 20 shown in Figure 3 were prepared. Each specimen 20 included a base 21, a base metal 22, a sprayed coating 23, and a plurality of bolts 24.
  • the base 21 had dimensions of 20 mm width, 50 mm length, and 10 mm thickness.
  • the base metal 22 was disposed on the upper face of the base 22.
  • the base metal 22 had a shape of 20 mm width, 50 mm length, and 1 mm thickness.
  • each end portion (opposite side portions) of the base metal 22 was secured to the base 21 with a bolt 24.
  • a sprayed coating 23 was formed on the upper face of the base metal 22.
  • the sprayed coating 23 was formed by arc spraying, the condition of which was the same as in Figure 1 , and the thickness thereof was 500 ⁇ m.
  • Heat treatment was not conducted for one specimen 20, and heat treatment was conducted at various heat treatment temperatures (400 to 650°C) and heat treatment times (5 to 70 minutes) shown in Table 1 for the other plurality of specimens 20.
  • the base metal 22 and the sprayed coating 23 were deflected due to tensile residual stress.
  • the distance from the upper face of the base 21 to the edge of the lower face of the base metal 22 was defined as a deflection FL (mm). It was judged that the deflection FL was an index of tensile residual stress, and the larger the deflection, the larger the tensile residual stress.
  • the deflection FL was smaller than in the specimen 20 which was not subjected to heat treatment, and thus tensile residual stress was reduced. Further, in the specimens 20 subjected to heat treatment, the tensile residual stress decreased as the heat treatment time increases.
  • the sprayed coating 12 As so far described, retaining the sprayed coating 12 at a heat treatment temperature of 400°C to 550°C for 5 to 60 minutes will result in an increase in the magnetite ratio in the sprayed coating 12, thereby increasing the adhesiveness of the sprayed coating 12 to the plug body 11. Further, the tensile residual stress of the sprayed coating 12 also decreases. Therefore, in the plugs 10 subjected to heat treatment at the above described condition, the sprayed coating 12 becomes less likely to peel off from the plug body 11.
  • the heat treatment time is 5 to 60 minutes.
  • a preferable lower limit of the heat treatment time will be 10 minutes, and more preferably 20 minutes.
  • the heat treatment temperature is preferably 500°C ⁇ 25°C (475°C to 525°C).
  • the adhesiveness of the sprayed coating 12 to the plug body 11 increases. Therefore, the sprayed coating 12 is less likely to peel off.
  • the sprayed coating 12 contains iron and iron oxides.
  • the sprayed coating 12 may further contain other oxides.
  • the sprayed coating 12 may contain W oxide (WO 3 ) along with iron oxides.
  • W oxide W oxide
  • the sprayed coating 12 will contain iron, iron oxides, and W oxide.
  • Each plug having a sprayed coating was heat treated at conditions of test numbers 1 to 20 shown in Table 2. An anti-peeling property of the sprayed coating of the each plug produced was evaluated.
  • Every plug of each test number had the shape shown in Figure 1 .
  • a sprayed coating of a thickness of 600 ⁇ m was formed on the surface of each plug.
  • the sprayed coating was formed by arc spraying an iron wire rod.
  • the conditions of arc spraying of each plug were the same for all of them.
  • Ten plugs were prepared for each test number.
  • Heat treatment was conducted on 10 plugs for each test number at the conditions (heat treatment temperature and heat treatment time) shown in Table 2. Note that the plug of test number 20 was not subjected to the heat treatment.
  • the plugs of test numbers 1 to 20 were used to piercing-roll round billets.
  • the round billets had a chemical composition corresponding to SUS304 of the JIS Standard, and each had the same diameter and length.
  • Each plug of each test number was used to piercing-roll three round billets. At this moment, the heating conditions and the piercing-roll conditions of each round billet were the same for every test number.
  • peeling rate number of plugs in which peeling is confirmed / 10 ⁇ 100
  • the rate of the plugs in which peeling is confirmed was defined as a peeling rate (%).
  • the heat treatment temperature was within a range of 400°C to 550°C and the heat treatment time was within a range of 5 to 60 minutes for each test number.
  • the peeling rate was as low as not more than 30%.
  • test numbers 1 and 2 the heat treatment temperature was as low as 350°C. Thereby, the peeling rate was high.
  • test numbers 18 and 19 the heat treatment temperature was as high as 600°C. Thereby, the peeling rate was high.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
EP13777664.7A 2012-04-19 2013-03-06 Method for producing plug for heat formed pipe Not-in-force EP2839891B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012095434A JP5566417B2 (ja) 2012-04-19 2012-04-19 穿孔プラグの製造方法
PCT/JP2013/056063 WO2013157312A1 (ja) 2012-04-19 2013-03-06 熱間製管用プラグの製造方法

Publications (3)

Publication Number Publication Date
EP2839891A1 EP2839891A1 (en) 2015-02-25
EP2839891A4 EP2839891A4 (en) 2015-11-25
EP2839891B1 true EP2839891B1 (en) 2016-08-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13777664.7A Not-in-force EP2839891B1 (en) 2012-04-19 2013-03-06 Method for producing plug for heat formed pipe

Country Status (4)

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US (1) US20150125630A1 (ja)
EP (1) EP2839891B1 (ja)
JP (1) JP5566417B2 (ja)
WO (1) WO2013157312A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017051632A1 (ja) * 2015-09-25 2017-03-30 新日鐵住金株式会社 ピアサープラグ及びその製造方法
JP6540441B2 (ja) * 2015-10-06 2019-07-10 日本製鉄株式会社 プラグの製造方法
JP7493161B2 (ja) * 2019-12-27 2024-05-31 Ｊｆｅスチール株式会社 継目無鋼管製造用プラグ、継目無鋼管製造用ピアッシングミルおよび継目無鋼管の製造方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5913924B2 (ja) * 1979-12-25 1984-04-02 日本鋼管株式会社 穿孔圧延機用芯金
EP0391949A1 (en) * 1987-12-23 1990-10-17 Uddeholm Tooling Aktiebolag Precipitation hardening tool steel for forming tools and forming tool made from the steel
JPH03277764A (ja) * 1990-03-27 1991-12-09 Komatsu Ltd 溶射皮膜方法
JPH04266406A (ja) * 1991-02-19 1992-09-22 Nippon Steel Corp 耐焼付性に優れた高合金継目無鋼管圧延用プラグおよびプラグ保護具
US5778714A (en) * 1995-05-19 1998-07-14 Nkk Corporation Method for manufacturing seamless pipe
JP3463481B2 (ja) * 1996-09-25 2003-11-05 松下電工株式会社 表面硬化Ｆｅ−Ａｌ系合金の製造方法
EP1632583B1 (en) * 2003-05-13 2010-09-29 Sumitomo Metal Industries, Ltd. Tool steel for hot working, tool for hot working and plug for producing seamless pipe
US20040245908A1 (en) * 2003-06-03 2004-12-09 Keizou Makino Support frame structure, cathode ray tube, and manufacturing method of color selection structure
CN101848777A (zh) * 2007-11-01 2010-09-29 住友金属工业株式会社 穿轧用顶头、该穿轧用顶头的再生方法以及该穿轧用顶头的再生设备列
JP5169982B2 (ja) * 2009-03-03 2013-03-27 新日鐵住金株式会社 プラグ、穿孔圧延機、およびそれを用いた継目無管の製造方法
US20100227180A1 (en) * 2009-03-05 2010-09-09 Babcock-Hitachi Kabushiki Kaisha Coating material for metallic base material surface
JP2011212734A (ja) * 2010-04-01 2011-10-27 Jfe Steel Corp 継目無管製造方法

Also Published As

Publication number Publication date
WO2013157312A1 (ja) 2013-10-24
EP2839891A1 (en) 2015-02-25
US20150125630A1 (en) 2015-05-07
EP2839891A4 (en) 2015-11-25
JP5566417B2 (ja) 2014-08-06
JP2013248619A (ja) 2013-12-12

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