US3259975A - Tube manufacture - Google Patents

Tube manufacture Download PDF

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Publication number
US3259975A
US3259975A US331715A US33171563A US3259975A US 3259975 A US3259975 A US 3259975A US 331715 A US331715 A US 331715A US 33171563 A US33171563 A US 33171563A US 3259975 A US3259975 A US 3259975A
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US
United States
Prior art keywords
tube
diameter
wall thickness
tubes
casting
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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.)
Expired - Lifetime
Application number
US331715A
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English (en)
Inventor
Edward C Chapman
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.)
Combustion Engineering Inc
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Combustion Engineering Inc
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Filing date
Publication date
Application filed by Combustion Engineering Inc filed Critical Combustion Engineering Inc
Priority to US331715A priority Critical patent/US3259975A/en
Priority to GB50174/64A priority patent/GB1038308A/en
Priority to BR165170/64A priority patent/BR6465170D0/pt
Priority to BE657283D priority patent/BE657283A/xx
Priority to ES0307208A priority patent/ES307208A1/es
Priority to DEC34681A priority patent/DE1282425B/de
Priority to SE15380/64A priority patent/SE310159B/xx
Priority to NL6414809A priority patent/NL6414809A/xx
Priority to US511151A priority patent/US3312534A/en
Application granted granted Critical
Publication of US3259975A publication Critical patent/US3259975A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • B22D13/023—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis the longitudinal axis being horizontal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • This invention relates to tube manufacture and particularly to an economical method of making high quality tubes such as boiler tubes especially those used in high pressure boilers.
  • An object of this invention is a method of making tubes with a minimum of plant investment and a minimum of forging steps.
  • a further object is an improved method by which a muff of improved forging quality and of sufficient size, including length, to render a stretch reducing step economically practical may be formed by centrifugal casting.
  • a further object is the combination of related steps of centrifugal casting a tubular member to obtain a preselected size and quality, cold rolling to reduce wall thickness and tube diameter and obtain additional length and then stretching reducing to reduce the diameter and further reduce wall thickness to produce the finished tube.
  • a further object is an improved method of producing, economically, a hot finished tube having more uniformly accurate dimensions of diameter and wall thicknesses.
  • a further object is to provide a method for producing hot finished seamless tubes of alloys difiicult or impossible. to hot work in the cast condition (as an ingot).
  • FIG. 1 is a schematic showing of the centrifugal casting step
  • FIG. 2 is a sectional of the cast muff
  • FIG. 4 is a sectional schematic view showing the smoothing operation
  • FIG. 5 is an end view of the smoothed muff
  • FIG. 6 is a sectional schematic view showing the rolling step reducing the wall thickness and diameter
  • FIG. 7 is an end view of the tube with the reduced wall thickness
  • FIG. 8 is a diagrammatic view showing the tube being stretched in the tube stretching mill.
  • FIG. 9 is a diagrammatic end view of the tube in the stretching mill.
  • tubing In the manufacture of tubing one of the problems is the production of tubing with a minimum of plant or machine investment and with a minimum of different steps or handling procedures, so as to produce tubing in a practical and economic manner.
  • Another problem is to economically provide a muff of a proper selected size and of a quality which will consistently satisfactorily respond to forging operation to provide a sound finished tube.
  • Boiler tubes including the superheater tubes which view and FIG. 3 is one end view I 3,259,915 Patented July 12, 1966 may be as small as inch in diameter and as large as 4 inches in diameter, are generally of carbon steel and heavy duty ferrous alloys which may be subjected to high temperature combustion gases of up to say 2800' F. and an internal pressure of say 3500 pounds per square inch or more and an internal temperature of 300 to 1200" F.
  • Such .a tube is preferably seamless particularly for operation at the higher temperatures and of as long a length as can be made practically, such as 60 feet or more so as to provide tubes with a minimum number of welds in furnace walls that may be say feet high.
  • a muff siutable for forming tubes in the to 4 inch diameter range from the usual solid cast ingots requires a large plant investment including melting, casting, rolling and piercing equipment to form the muff, particularly in the case of non-pierceable materials where the perforation must be drilled or otherwise made in solid stock, and in order to get a muff suitable for producing a tube of such diameter and 50 feet or more long would require several forging operations.
  • Applicant has invented a process of making tubes which utilizes the advantages of certain steps to overcome the limitation of others to provide a simple economical method of tube manufacture. It is this unique combination of steps that results in the production of high quality heavy wall small diameter tubes in an economic manner.
  • muffs suitable for subsequently forging into small tubes say of 4 inches and less diameter with a minimum of forging steps can be economically produced by a centrifugal casting step in which thick walled tubes of say to 2 inch wall thickness and in lengths of 8 to 12 feet, when the rotating mold is fed from one end and of 16 to 20 feet, when the rotating mold is fed from both ends, may be economically formed of the required diameters and quality.
  • a centrifugal casting step in which thick walled tubes of say to 2 inch wall thickness and in lengths of 8 to 12 feet, when the rotating mold is fed from one end and of 16 to 20 feet, when the rotating mold is fed from both ends, may be economically formed of the required diameters and quality.
  • the centrifugally cast muff be of a quality, size, and material which will consistently provide uniform and sound tubes.
  • the steel to form the cast muff is melted preferably under controlled atmospheric conditions such as in an .argon atmosphere, in any suitable furnace, such as an induction furnace 10, to a desired pouring temperature which should be in a narrow range around 2800, or slightly above, in order to provide proper distribution in the mold before congealing sets in.
  • the composition of the melt is carefully controlled by the addition of suitable ingredients at the proper time to insure that the material reaching the mold will have the desired composition.
  • the molten metal has been shown as passing from the furnace 10 to a ladle 12 from which it may be poured into the spout 14 feeding the rotating centrifugal mold 16 in which the muff 18 is cast
  • the entire path of the molten metal from the furnace 10 to and including the interior 20 of the rotating mold may be encased in or surrounded by an inert atmosphere such as argon or a reducing atmosphere such as hydrogen in order to avoid any contamination or impurities which could result in slag, dross or other impurities forming in the inner surface of the cast muff or contamination by moisture, oxygen and nitrogen from the air.
  • a predetermined amount of metal determined by the dimensions of the muff to be cast, is poured 'at a preselected and carefully controlled rate through the nozzle 14 into the rapidly rotating muff 16 which may be rotated by any suitable means, such as rollers 22, driven from any suitable source not shown.
  • the mold 16, which maybe of metal, is lined, preferably with a porous ceramic material which will provide .as smooth an outside surface to the cast mulf as is possible in order to limit the extent of subsequent machining if such is found necessary or desirable, and will also act as an insulator to prevent rapid chilling of the outer surface of the molten metal as it flows into the mold.
  • This lining material may be applied either by spraying or spinning onto a preferably preheated mold and is at least partially removed from the mold with the mulf at the time of the extraction of the muff.
  • Suitable end pieces 24 and 26 are applied to the preferably cylindrical mold and may have a central opening therein substantially equal to the inside diameter'of the cast mufi.
  • the diameter of the aperture through the end piece 26 must be at least large enough to accommodate a spout which will deliver the molten metal at the predetermined selected rate.
  • Hot short material such as type 347 or i 316 steels give difficulty when Worked hot directly from the casting, but by using applicants process can be sub- 1 seqnently satisfactorily hot worked. Because of thehigher temperatures associated with piercing, satisfactory muffs of this type of material free of defects cannot i be produced by piercing billets no can satisfactory blooms or billets be made by hot rolling. Certain other high alloymaterials cannot be successfully pierced.
  • the piercer isjelimi nated.
  • Several heating operations for hot working and the necessary furnaces are also eliminated.
  • Applicantis process therefore eliminates a number of costly operations of the conventional steel mill methods for making tubes.
  • Applicants process further permits the production of such tubes economically at a relatively small production rate per year. Since a number of operations are eliminated, the labor costs are less. With less investment and labor cost, tubes can be produced economically with less tonnage. It is applicable to almost any ferrous and nonferrous metal and probably has greater flexibility in this regard than other processes. pierced and centrifugal castings can be made of such ma- Many materials cannot be terials.
  • the minor surface defects produced by possible irregularities in the mold ceramic lining on the exterior of the muff and the dross or other impurities that may appear on the interior surface of the muff 18 may be removed by subsequent mechanical operations such as turning i.e. removing metal by a cutting tool 26, or grinding to provide smooth exterior and interior surfaces and a muff 19 having walls of good concentricity and of uniform dimensions throughout the length and circumference of the rnuif.
  • This muff 19 has an outside diameter which may be several times that of the desired finished tube and a wall thickness which may be several times that of the desired finished tube.
  • the tube can most efliciently be reduced in wall thickness by subjecting it to a cold working rolling operation in a device 28 known as a tube reducing or a rocking machine by which the wall thickness can be reduced up to 70 or 80% in a single pass by squeezing the tube between rolls or rockers 28 and over a mandrel 30.
  • a device 28 known as a tube reducing or a rocking machine by which the wall thickness can be reduced up to 70 or 80% in a single pass by squeezing the tube between rolls or rockers 28 and over a mandrel 30.
  • This operation will materially lengthen the tube, reduce the outside and inside diameter and wall thickness.
  • the heat treating operation is not required prior to reducing.
  • the wall thickness may be brought down to approximately the wall thickness desired in the finished tube evenly and accurately, the concentricity improved and the diameter reduced to provide a semi-finished product 36 with a diameter several times that of the finished tube but with a concentricity providing a uniform wall thickness throughout the length and circumference of the tube, substantially that desired of the finished tube.
  • This cold working followed by heating will further compact and improve the grain structure of the already dense casting and provide a product which can be transformed into the desired finished tube in one further forging step.
  • the uniformity of quality of the centrifugal casting and the avoidance of the non-metallic inclusions or shrinkage cavities of the ingot are essential if the tube reducing operation is to be successful.
  • this tube reducing operation is carried out cold, i.e., the metal is plastically deformed without heating and therefore the casting in order to withstand this severe operation must have no macroscopic defect, i.e., defects of a size that will result in fracture of the casting during reduction.
  • Castings are produced by the centrifugal casting process of such a quality that after the tube reducing operation they can be successfully hot stretched reduced without developing flaws. This means that the material as a result of grain refinement is not hot short and that the cold reducing operation has not introduced flaws which would cause failure in the subsequent hot operation. Both of these operations test the material severely. If the material is successful in passing both of these operations it is certain to be a good material since it has been tested both hot and cold.
  • This next forging step should be a stretch reducing step in which the semi-finished tube 36 from the tube reducing machine is heated and then hot stretched and rolled to reduce the tube diameter from that of a semifinished product 36 without materially changing the wall thickness to produce the finished tube 38 having substantially concentric inner and outer walls and of the desired outside and inside dimensions and length.
  • the heating of the cold worked tube 36 serves the double purpose of refining the grain and relieving the stress in the cold worked tube as well as rendering that tube sufiiciently ductile to be stretch reduced in the stretch mill.
  • the stretch reducing mill consists of a series of roll stands 32, 33, 34, the number depending on the degree of reduction required and may be 24 or more.
  • Each set of rolls reduces the diameter of the tube but at the same time through individual speed control of each individual set of rolls, by well-known means not shown, the wall thickness likewise can be reduced by putting tension on the tube.
  • the rolls were not individually driven and the so-called hot reducing mill merely reduced diameter with some increase in wall thickness.
  • a reduction in wall thickness is desired since this makes possible thinner walls in the finished tube.
  • the stretch mill has the great advantage of having the capacity to take a relatively large diameter hollow and reduce it in one pass down to a practically unlimited small diameter. For instance, hollows in the order of 7 inches in diameter may be reduced down to the order of /2 inch in diameter in one pass through the stretch mill. Since it is easier to make large diameter centrifugal casting than small diameter, and since the weight goes up directly with the diameter, it becomes obvious that a stretch mill is uniquely suited for the process of producing tubes from centrifugal casting. From the standpoint of cost it is desirable to enter the stretch mill with as large a diameter and the heaviest weight possible. The heaviest weight possible calls for the longest length, the largest diameter and the heaviest Wall. The cost of the finished tube per unit length is reduced proportionately with increase in weight of the starting hollow.
  • the stretch reducing mill has a limitation on the maximum wall reduction it can make whereas in general there is no limitation on the diameter reduction it can make.
  • the maximum reduction in wall thickness is in the order of 35%.
  • the stretch mill has no limitation on the length it can receive and the length limitation in the present process is imposed by the maximum length of centrifugal casting that can be produced with the desired diameter and wall thickness.
  • the tube reducer or cold rolling step can make a material reduction in the wall thickness and some reduction in the diameter of the casting. With the reduced diameter and the reduced wall thickness a cross sectional area reduction of more than 70% is possible, for many materials since the tube reducing operation which takes a machined hollow and both reduces its diameter and wall thickness and at the same time increases its length can make cross sectional area reduction of over 70%, say 80% for many materials. This means that the entering length is multiplied by 5. If
  • the tube reduced hollow With a casting length of 20 feet, after reduction the tube reduced hollow would be from 60 to 100 feet long. This tube after passing through the stretch reducing mill would have a final length of from 150 to 500 feet or longer depending on the proportions of the tube being reduced and the proportions of the finished tube. With tubes of this length the discard would be but a small percentage of the total length of the tube produced.
  • muffs can readily be cast of a length, diameter concentricity and wall thickness particularly suited for conversion into tubes by the following forging steps and this size can readily be selected so that only two forging steps are required to complete the tube to the desired finished size.
  • a wall thickness can be obtained that is well within the capacity of the tube reducing machine to produce an accurately concentric tube of substantially the finished wall thickness in but one pass and selecting the proper size of rotating mold a diameter can be obtained that is well within the capabilities of the stretch mill to reduce to the finished tubing size still maintaining the accurate concentricity in one pass through the stretch mill and the mold length can be adjusted so as to provide a cast muff which will be long enough to provide a finished tube of a length great enough to provide small cutting losses.
  • the not yield from metal melted to finished tube is greater, thus effecting an overall reduction in cost. Cropping of the ingot and trimming of billets is eliminated.
  • the method of making seamless tubes from a tubulous casting comprising first subjecting the casting to a cold forging operation to improve the concentricity of the tube, and the grain structure and reduce the wall thickness and increase the casting length, then subjecting the cold forged tube to a hot stretching operation to reduce the tube diameter and wall thickness and further increase the tube length.
  • tubulous casting is a casting of a metal which is hot short in the as cast state at hot forging temperatures.
  • the method of making a hot finished seamless tube to substantially cold finish tolerances comprising centrifugally casting a substantially flawless, susbtantially concentric mufi of malleable material, larger in diameter and wall thickness than the finished tube, cold reducing the diameter and wall thickness of said muff and improving the concentricity, and then hot stretching said cold worked muff without materially altering the concentricity to produce an elongated hot finished tube of substantially cold finish tolerances.
  • the method of making a seamless metal tube comprising pouring a predetermined quantity of substantially uncontaminated molten metal into a rotating cylindrical mold to form a substantially concentril cylindrical muff of predetermined limited dimensions and Weight and substantially flawless material, cold reducing said muff over a mandrel in a single pass through a cold swaging tube reducing machine to reduce the cross sectional area over 60%, mainly by wall thickness reduction, improve the concentricity and materially lengthen said muflt', heating said cold reduced mulf and further reducing the cross sectional area over 60%, mainly by diameter reduction 1 1 and lengthening said tube in a single pass through a hot stretch reducing mill to provide a substantially concentric elongated seamless tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Metal Extraction Processes (AREA)
  • Continuous Casting (AREA)
US331715A 1963-12-19 1963-12-19 Tube manufacture Expired - Lifetime US3259975A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US331715A US3259975A (en) 1963-12-19 1963-12-19 Tube manufacture
GB50174/64A GB1038308A (en) 1963-12-19 1964-12-09 Method of making seamless tubes
BR165170/64A BR6465170D0 (pt) 1963-12-19 1964-12-11 Fabricacao de tubos
ES0307208A ES307208A1 (es) 1963-12-19 1964-12-17 El metodo de hacer tubos sin costura.
BE657283D BE657283A (de) 1963-12-19 1964-12-17
DEC34681A DE1282425B (de) 1963-12-19 1964-12-17 Verfahren zum Herstellen nahtloser Rohre
SE15380/64A SE310159B (de) 1963-12-19 1964-12-18
NL6414809A NL6414809A (de) 1963-12-19 1964-12-18
US511151A US3312534A (en) 1963-12-19 1965-12-02 Tube manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US331715A US3259975A (en) 1963-12-19 1963-12-19 Tube manufacture

Publications (1)

Publication Number Publication Date
US3259975A true US3259975A (en) 1966-07-12

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US331715A Expired - Lifetime US3259975A (en) 1963-12-19 1963-12-19 Tube manufacture

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US (1) US3259975A (de)
BE (1) BE657283A (de)
BR (1) BR6465170D0 (de)
DE (1) DE1282425B (de)
ES (1) ES307208A1 (de)
GB (1) GB1038308A (de)
NL (1) NL6414809A (de)
SE (1) SE310159B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314143A (en) * 1964-11-03 1967-04-18 Robert E Mcdonald Method for producing tube shells
US3317994A (en) * 1964-08-19 1967-05-09 Southwire Co Method of conditioning metal for hot forming
US4196505A (en) * 1977-11-15 1980-04-08 Usui Kokusai Sangyo Kabushiki Kaisha Method of manufacturing high pressure fuel injection pipes
WO1980001257A1 (fr) * 1978-12-19 1980-06-26 Kubota Ltd Procede et dispositif pour l'ajustage de la surface interne d'un article cylindrique moule
US4317271A (en) * 1979-01-08 1982-03-02 Combustion Engineering, Inc. Method of making metal tubes
US20090169911A1 (en) * 2005-12-06 2009-07-02 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Extrusion-molded hollow material, and apparatus and method for molding same
CN104190740A (zh) * 2014-07-15 2014-12-10 攀钢集团成都钢钒有限公司 热轧无缝钢管管坯的生产方法
US10890388B2 (en) 2016-10-21 2021-01-12 General Electric Technology Gmbh System and method for additively manufacturing boiler tubes
CN113680985A (zh) * 2021-08-26 2021-11-23 北京钢研高纳科技股份有限公司 低成本短流程高温合金无缝管的制备方法
CN115971263A (zh) * 2023-03-20 2023-04-18 太原理工大学 无缝金属复合管在线梯度控温设备及其轧制与热处理方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032106C2 (de) * 1980-08-22 1986-01-16 Manfred Dr.-Ing. 4150 Krefeld Janßen Verfahren und Vorrichtung zur kontinuierlichen Herstellung von Rohren mit abgestuftem Innen- und Außendurchmesser
DE102011109071A1 (de) * 2011-07-30 2013-01-31 Sms Meer Gmbh Rohrschmiedeverfahren mit urgeformten Hohlblock
DE102017105582A1 (de) * 2016-04-01 2017-10-05 Sms Group Gmbh Verfahren und Anlage zur Herstellung eines nahtlosen warmgewalzten Rohres sowie gewalztes Schleudergussrohr und die Verwendung eines durch Schleuderguss hergestellten Hohlblocks

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB473726A (en) * 1936-09-12 1937-10-19 Oederlin Cie Ag Process and apparatus for the production of metal castings
US2245421A (en) * 1937-12-13 1941-06-10 United States Pipe Foundry Method of making deformed steel tubes
FR899220A (fr) * 1943-10-28 1945-05-24 Procédé de fabrication de tubes étirés sans soudure en métaux non ferreux, et lingotière centrifuge utilisable dans la première phase de ce procédé
CA494252A (en) * 1953-07-07 Hudson Bay Mining And Smelting Co. Method of decreasing dross formation in the melting of zinc
US3174221A (en) * 1960-12-20 1965-03-23 Oregon Metallurgical Corp Process for making sheet from brittle metals

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE566714C (de) * 1931-03-19 1932-12-20 Peter Otto Verfahren zum Herstellen von Rohlingen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA494252A (en) * 1953-07-07 Hudson Bay Mining And Smelting Co. Method of decreasing dross formation in the melting of zinc
GB473726A (en) * 1936-09-12 1937-10-19 Oederlin Cie Ag Process and apparatus for the production of metal castings
US2245421A (en) * 1937-12-13 1941-06-10 United States Pipe Foundry Method of making deformed steel tubes
FR899220A (fr) * 1943-10-28 1945-05-24 Procédé de fabrication de tubes étirés sans soudure en métaux non ferreux, et lingotière centrifuge utilisable dans la première phase de ce procédé
US3174221A (en) * 1960-12-20 1965-03-23 Oregon Metallurgical Corp Process for making sheet from brittle metals

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3317994A (en) * 1964-08-19 1967-05-09 Southwire Co Method of conditioning metal for hot forming
US3314143A (en) * 1964-11-03 1967-04-18 Robert E Mcdonald Method for producing tube shells
US4196505A (en) * 1977-11-15 1980-04-08 Usui Kokusai Sangyo Kabushiki Kaisha Method of manufacturing high pressure fuel injection pipes
WO1980001257A1 (fr) * 1978-12-19 1980-06-26 Kubota Ltd Procede et dispositif pour l'ajustage de la surface interne d'un article cylindrique moule
GB2048743A (en) * 1978-12-19 1980-12-17 Kubota Ltd Method and device for machining inner surface of moulded cylindrical article
US4317271A (en) * 1979-01-08 1982-03-02 Combustion Engineering, Inc. Method of making metal tubes
US8516870B2 (en) 2005-12-06 2013-08-27 Kobe Steel, Ltd. Method for forming an extruded hollow section
US8202625B2 (en) * 2005-12-06 2012-06-19 Kobe Steel, Ltd. Extruded hollow section, forming apparatus for forming same, and method for forming same
US20090169911A1 (en) * 2005-12-06 2009-07-02 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Extrusion-molded hollow material, and apparatus and method for molding same
US8522592B2 (en) 2005-12-06 2013-09-03 Kobe Steel, Ltd. Forming apparatus for forming extruded hollow section
CN104190740A (zh) * 2014-07-15 2014-12-10 攀钢集团成都钢钒有限公司 热轧无缝钢管管坯的生产方法
CN104190740B (zh) * 2014-07-15 2016-04-13 攀钢集团成都钢钒有限公司 热轧无缝钢管管坯的生产方法
US10890388B2 (en) 2016-10-21 2021-01-12 General Electric Technology Gmbh System and method for additively manufacturing boiler tubes
CN113680985A (zh) * 2021-08-26 2021-11-23 北京钢研高纳科技股份有限公司 低成本短流程高温合金无缝管的制备方法
CN113680985B (zh) * 2021-08-26 2022-04-29 北京钢研高纳科技股份有限公司 低成本短流程高温合金无缝管的制备方法
CN115971263A (zh) * 2023-03-20 2023-04-18 太原理工大学 无缝金属复合管在线梯度控温设备及其轧制与热处理方法
CN115971263B (zh) * 2023-03-20 2023-06-23 太原理工大学 无缝金属复合管在线梯度控温设备及其轧制与热处理方法

Also Published As

Publication number Publication date
BE657283A (de) 1965-06-17
ES307208A1 (es) 1965-05-16
BR6465170D0 (pt) 1973-07-03
NL6414809A (de) 1965-06-21
SE310159B (de) 1969-04-21
DE1282425B (de) 1968-11-07
GB1038308A (en) 1966-08-10

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