US20080141616A1 - Method for Joining Dispersion-Strengthened Alloy - Google Patents

Method for Joining Dispersion-Strengthened Alloy Download PDF

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Publication number
US20080141616A1
US20080141616A1 US11/587,967 US58796707A US2008141616A1 US 20080141616 A1 US20080141616 A1 US 20080141616A1 US 58796707 A US58796707 A US 58796707A US 2008141616 A1 US2008141616 A1 US 2008141616A1
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Prior art keywords
tube
dispersion
joining
joint
cross
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Abandoned
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US11/587,967
Inventor
Claes Ohngren
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Sandvik Intellectual Property AB
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Sandvik Intellectual Property AB
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Publication of US20080141616A1 publication Critical patent/US20080141616A1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • B23K33/004—Filling of continuous seams
    • B23K33/006—Filling of continuous seams for cylindrical workpieces
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • 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
    • B23K11/34—Preliminary treatment
    • 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
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/24—Preliminary treatment
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/06—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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B23K2103/05—Stainless steel

Definitions

  • the present invention relates to a method for joining two or more components and/or construction parts, at least one of which consists of a dispersion-strengthened alloy.
  • Construction parts of dispersion-strengthened material such as, e.g., Kanthal APM or APMT have turned out to best meet the requirements that are made on the construction parts in so-called high-temperature applications, where, e.g., gases are led through a radiant tube that has been heated by means of surrounding burners to a sufficiently high temperature, for instance about 1100° C.
  • gases are led through a radiant tube that has been heated by means of surrounding burners to a sufficiently high temperature, for instance about 1100° C.
  • the tube is heated from the outside to a temperature at which the chemical reaction occurs.
  • Typical for the temperature of the tube at the inlet end of the gas is 900° C. and at the outlet end 1125° C. and up to 1200° C.
  • the Swedish patent application No. 0301500-5 discloses radiant tubes in a cracking furnace, where hydrocarbons are cracked into ethylene in a tube through which hydrocarbons flow, which is heated from the outside to a temperature at which cracking of hydrocarbons occurs, and is characterized in that the tube is made from a FeCrAl material containing, in addition to Fe, 10-25% by weight of Cr, 1-10% by weight of Al and 1.5-5% by weight of Mo as well as a smaller quantity of alloying elements.
  • Dispersion-strengthened alloys are mostly used in applications where temperatures up to 1200° C. occur. This, in combination with construction principles that require long, suspended tubes, imposes special requirements on welds and joinings, respectively, of the tubes.
  • the construction is optimized in terms of the wall thickness. The decisive factors are the service life and a maximum heat transfer from the outside of the tube, which are promoted by thinner tubes and higher strength. The strength of the tube has to be chosen so that at least the dead load is carried.
  • a construction part may typically be up to 10 to 17 m long and may, for instance, be composed of two or more parts, e.g., tubes, welded together.
  • the present invention provides a method for joining construction parts where one or both parts consist of a dispersion-strengthened alloy by combining known joining techniques with cross-section enlargement of the joint area with the purpose of increasing the strength in the joint and weld area, respectively, to such an amount that the load is carried by the tube.
  • the present invention provides a method for joining construction parts where one or both parts consist of a dispersion-strengthened alloy by cross-section enlargement of the joint area before the joining with the purpose of increasing the strength in the joint and weld area, respectively, to such an amount that the load is carried by the tube and the use of the construction part in high-temperature applications.
  • the dispersion-strengthened alloy that is used in the method according to the present invention has a composition according to the following (in % by weight):
  • the material contains smaller fractions of one or more of the alloying elements hafnium, zirconium, yttrium, nitrogen, carbon and oxygen.
  • the present invention may be varied in respect of the material composition above all regarding alloying elements that have low content in the material.
  • the wall thickness of the construction part should be enlarged only at the joint area. No noticeable increase in dead load arises and the heat transfer does not become altered in comparison with conventional design.
  • the load experienced by the joint is calculated according to equation 1.
  • the force F which is unchanged, yields a reduction of the creep rupture criterion by a factor of 2.
  • equation (1) yields the following ⁇ b :
  • equation (1) yields:
  • the desired enlargement of the wall thickness of said construction parts that are to be joined may be achieved by a plurality of manufacturing methods such as forging, HIP-ing and turning.
  • forging In high temperature applications with the construction parts of the above-described material being used, the tube length frequently exceeds 6 m. This entails that forging is the most cost-effective method for joining or welding tubes to desired construction and/or length.
  • wall thickening should have an extension in the longitudinal axis of the construction part and of the tube, respectively, of at least 30 mm.
  • the cross section should be enlarged by an amount that at least corresponds to the load decrease that is aimed at, i.e., the cross-section enlargement is inversely proportional to the load according to the equation above.
  • the method according to the present invention also has the advantage that one or more construction parts of dispersion-strengthened and/or other materials, such as, e.g., stainless steel, can be joined.
  • the method according to the present invention has the advantage to be capable of making use of conventional methods, such as, e.g., conventional welding as TIG for the joining of the forged construction parts, which is a significant factor in respect of construction and assembly.
  • a possible field of application for tubes joined by the method according to the present invention is so-called radiant tubes in cracking furnaces.
  • H 2 C H 2 C, which constitutes a raw material for the plastics industry.
  • Radiant tubes occur in a cracking furnace, where hydrocarbons are cracked into ethylene in a tube through which hydrocarbons flow.
  • the cracking takes place by the fact that hydrocarbons are led through a radiant tube that has been heated by means of surrounding burners to a sufficiently high temperature at which cracking occurs, for instance about 1100° C., for ethylene to be formed in the tube.
  • the temperature of the tube at the inlet end of the gas is 900° C. and at the outlet end approx. 1125° C. and up to 1200° C.

Abstract

The present invention relates to a method for joining two or more components and/or construction parts, at least one of which consists of a dispersion-strengthened alloy having the following composition (in % by weight): C up to 0.08 Si up to 0.7 Cr 10-25 Al 1-10 Mo 1.5-5 Mn up to 0.4 balance Fe as well as normally occurring impurities by the fact that the cross section in the joint is enlarged by forging before joining and where the product manufactured according to the method can be used in high-temperature applications at temperatures above 900° C.

Description

  • The present invention relates to a method for joining two or more components and/or construction parts, at least one of which consists of a dispersion-strengthened alloy.
    • BACKGROUND OF THE INVENTION
  • Construction parts of dispersion-strengthened material, such as, e.g., Kanthal APM or APMT have turned out to best meet the requirements that are made on the construction parts in so-called high-temperature applications, where, e.g., gases are led through a radiant tube that has been heated by means of surrounding burners to a sufficiently high temperature, for instance about 1100° C. The tube is heated from the outside to a temperature at which the chemical reaction occurs. Typical for the temperature of the tube at the inlet end of the gas is 900° C. and at the outlet end 1125° C. and up to 1200° C.
  • In the Swedish patent No. 467 414, a dispersion-strengthened FeCrAl material is disclosed where it is stated that the creep strength is increased by the fact that the material is alloyed with cobalt, nickel, silicon, manganese, zirconium and titanium as well as a small quantity of yttrium and hafnium after which the material is heat-treated at minimum 1050° C. Radiant tubes are manufactured from the same material.
  • In the Swedish patent No. 513 989, a method is disclosed for the manufacture of a dispersion-strengthened FeCrAl material by gas atomization. The problem in gas atomization, which is solved according to the patent, is that in the manufacture of a dispersion-strengthened material containing titanium, small particles of TiN and TiC are formed in the charge before the atomization, which particles stick to the melt nozzle being used for the atomization and that the same get clogged. The solution consists of the charge to be atomized being brought to contain 0.05-0.50% by weight of tantalum and simultaneously less than 0.10% by weight of titanium. In the patent No. 513 989, it is stated that the material may contain molybdenum (Mo).
  • Above, it was stated that the creep strength was increased by means of a material according to the patent No. 467 414. However, additional raised requirements on creep strength, ductility, as well as raised requirements on the service life of said tube have been added. It would also be desirable to be able to manufacture longer tubes that resist the high temperature during longer time than tubes known hitherto.
  • The Swedish patent application No. 0301500-5 discloses radiant tubes in a cracking furnace, where hydrocarbons are cracked into ethylene in a tube through which hydrocarbons flow, which is heated from the outside to a temperature at which cracking of hydrocarbons occurs, and is characterized in that the tube is made from a FeCrAl material containing, in addition to Fe, 10-25% by weight of Cr, 1-10% by weight of Al and 1.5-5% by weight of Mo as well as a smaller quantity of alloying elements.
  • Dispersion-strengthened alloys are mostly used in applications where temperatures up to 1200° C. occur. This, in combination with construction principles that require long, suspended tubes, imposes special requirements on welds and joinings, respectively, of the tubes. The construction is optimized in terms of the wall thickness. The decisive factors are the service life and a maximum heat transfer from the outside of the tube, which are promoted by thinner tubes and higher strength. The strength of the tube has to be chosen so that at least the dead load is carried. A construction part may typically be up to 10 to 17 m long and may, for instance, be composed of two or more parts, e.g., tubes, welded together.
  • Upon joining of one or more components or construction parts where at least one of the parts is a dispersion-strengthened alloy, wide zones including precipitations of, e.g., nitrides and/or larger oxide clusters occur, which results in a considerable weakening of the construction at said welds and jointings, respectively. This weakening means that the joint in the dispersion-strengthened material at a certain combination of temperature and load does not meet the strength criteria for the construction. In many constructions where dispersion-strengthened material is used, the dead load is the largest load on the joint. Therefore, it is not possible to enlarge the wall thickness on the entire tube in order to meet design criteria in the joint since the load then increases. Also from a cost and heat transfer point of view, it is not desirable to use a thicker wall than in conventional design of the tube construction. With the purpose of joining construction parts with one or both parts consisting of a dispersion-strengthened alloy, the mechanical strength in the joint falls to half the value in comparison with the basic material as consequence of the necessary heating. This entails that welds, joinings or the like form potential indications of fracture.
    • SUMMARY OF THE INVENTION
  • Therefore, it is an object of the present invention to provide a method for joining components, at least one of which consists of a dispersion-strengthened alloy where the above-described disadvantages can be eliminated and the construction is optimized.
    • DETAILED DESCRIPTION OF THE INVENTION
  • The present invention provides a method for joining construction parts where one or both parts consist of a dispersion-strengthened alloy by combining known joining techniques with cross-section enlargement of the joint area with the purpose of increasing the strength in the joint and weld area, respectively, to such an amount that the load is carried by the tube.
  • The present invention provides a method for joining construction parts where one or both parts consist of a dispersion-strengthened alloy by cross-section enlargement of the joint area before the joining with the purpose of increasing the strength in the joint and weld area, respectively, to such an amount that the load is carried by the tube and the use of the construction part in high-temperature applications.
  • The dispersion-strengthened alloy that is used in the method according to the present invention has a composition according to the following (in % by weight):
  •
    C  up to 0.08
    Si up to 0.7
    Cr 10-25
    Al  1-10
    Mo 1.5-5  
    Mn up to 0.4

    balance Fe as well as normally occurring impurities
  • It is preferred that the material contains smaller fractions of one or more of the alloying elements hafnium, zirconium, yttrium, nitrogen, carbon and oxygen.
  • The present invention may be varied in respect of the material composition above all regarding alloying elements that have low content in the material.
  • In order to be able to use a dispersion-strengthened alloy, the wall thickness of the construction part should be enlarged only at the joint area. No noticeable increase in dead load arises and the heat transfer does not become altered in comparison with conventional design.
  • The load experienced by the joint is calculated according to equation 1.

  • σ=F/A  Equation (1)
    • σ=Tension [MPa] F=Force [N] A=Cross section area [mm2]
  • If the force F yields the creep rupture criterion σb for the joint, e.g., σb=4 MPa at 1100° C./100 000 h and the strength in the dispersion-strengthened joint is σ=2 MPa, the material cannot be used in conventional design of the joint.
  • However, if enlargement of the wall thickness at the joint area is employed, where A is increased by, e.g., a factor of 2, the force F, which is unchanged, yields a reduction of the creep rupture criterion by a factor of 2. In the case above, this means that the creep rupture criterion is decreased from σb=4 MPa to σb=2 Mpa, and the strength in the joint where one or both parts consist of a dispersion-strengthened alloy thereby meets the design criterion.
  • In the case of conventional design, equation (1) yields the following σb:
    • F=F1 [N] A=A1 [mm2]

  • σb =F 1 /A 1  Equation (1)
  • In the case with enlargement of the wall thickness when A is increased by a factor of 2 in relation to conventional design, equation (1) yields:
    • F=F1 [N] A=2A1 [mm2]

  • σb =F 1/2A 1  Equation (1)
  • The desired enlargement of the wall thickness of said construction parts that are to be joined may be achieved by a plurality of manufacturing methods such as forging, HIP-ing and turning. In high temperature applications with the construction parts of the above-described material being used, the tube length frequently exceeds 6 m. This entails that forging is the most cost-effective method for joining or welding tubes to desired construction and/or length.
  • Thus, the geometry of the tube at the joint having enlarged wall thickness does not affect the flowing properties in the process significantly, neither on the outside nor on the inside of the tube. For practical reasons, wall thickening should have an extension in the longitudinal axis of the construction part and of the tube, respectively, of at least 30 mm. The cross section should be enlarged by an amount that at least corresponds to the load decrease that is aimed at, i.e., the cross-section enlargement is inversely proportional to the load according to the equation above.
  • The method according to the present invention also has the advantage that one or more construction parts of dispersion-strengthened and/or other materials, such as, e.g., stainless steel, can be joined.
  • The method according to the present invention has the advantage to be capable of making use of conventional methods, such as, e.g., conventional welding as TIG for the joining of the forged construction parts, which is a significant factor in respect of construction and assembly.
  • A possible field of application for tubes joined by the method according to the present invention is so-called radiant tubes in cracking furnaces.
  • In cracking furnaces or ethylene furnaces, hydrocarbons are cracked into ethylene, H2C=H2C, which constitutes a raw material for the plastics industry.
  • Radiant tubes occur in a cracking furnace, where hydrocarbons are cracked into ethylene in a tube through which hydrocarbons flow. The cracking takes place by the fact that hydrocarbons are led through a radiant tube that has been heated by means of surrounding burners to a sufficiently high temperature at which cracking occurs, for instance about 1100° C., for ethylene to be formed in the tube. Typically, the temperature of the tube at the inlet end of the gas is 900° C. and at the outlet end approx. 1125° C. and up to 1200° C.

Claims (12)

1. Method for joining one or more construction parts, at least one of the parts consisting of a dispersion-strengthened alloy, comprising enlarging by forging a cross section in the joint before joining.
2. Method for joining one more construction parts according to claim 1, wherein the dispersion-strengthened alloy has a composition comprising (in % by weight):
C up to 0.08
Ci up to 0.7
Cr 10-25
Al 1-10
Mo 1.5-5
Mn up to 0.4
balance Fe as well as normally occurring impurities.
3. Construction part manufactured according to method according to claim 1 for use in high-temperature applications at temperatures above 900° C.
4. Construction part manufactured according to the method according to claim 1 for use in cracking furnaces.
5. Construction part manufactured according to the method according to claim 1, where a creep rupture criterion σ==F1/A1 in the joint is increased by cross-section enlargement.
6. A method for joining a first tube to a second tube, the method comprising:
enlarging a first end of the first tube by forging to increase a cross-sectional area of a tube wall at the first end; and
welding the enlarged first end to the second tube,
wherein the first tube is formed from a dispersion strengthened alloy.
7. The method of claim 6, wherein the dispersion strengthened alloy has a composition comprising (in % by weight):
C up to 0.08
Ci up to 0.7
Cr 10-25
Al 1-10
Mo 1.5-5
Mn up to 0.4
balance Fe as well as normally occurring impurities.
8. The method of claim 6, wherein welding the enlarged first end to the second tube forms a joint and wherein a creep rupture criterion σ=F1/A1 in the joint is increased by cross-section enlargement.
9. The method of claim 6, wherein enlarging the first end of the first tube is by forging.
10. The method of claim 6, wherein enlarging the first end of the first tube is by turning or by HIP-ing.
11. The method of claim 6, wherein the cross-sectional area is increased by an amount that at least corresponds to a load decrease.
12. The method of claim 6, wherein the first tube is a radiant tube in a cracking furnace.
US11/587,967 2004-04-30 2005-04-20 Method for Joining Dispersion-Strengthened Alloy Abandoned US20080141616A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0401139A SE528132C2 (en) 2004-04-30 2004-04-30 Method of joining dispersion-curing alloy
SE0401139-1 2004-04-30
PCT/SE2005/000572 WO2005105362A1 (en) 2004-04-30 2005-04-20 Method for joining dispersion-strengthened alloy

Publications (1)

Publication Number Publication Date
US20080141616A1 true US20080141616A1 (en) 2008-06-19

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US (1) US20080141616A1 (en)
EP (1) EP1744854A1 (en)
JP (1) JP2007535409A (en)
KR (1) KR20070005711A (en)
CN (1) CN1950171A (en)
SE (1) SE528132C2 (en)
WO (1) WO2005105362A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10260370B2 (en) 2014-12-10 2019-04-16 General Electric Company Nanostructured ferritic alloy components and related articles
US10480332B2 (en) 2014-12-10 2019-11-19 General Electric Company Rotors and methods of making the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE528189C2 (en) * 2004-12-21 2006-09-19 Sandvik Intellectual Property Method and pipe joint for joining components comprising or made of a material which is difficult to weld
ES2938132B2 (en) * 2021-10-04 2023-09-26 Mecanizacion Ind Astillero S A Method for optimizing the roughness of a rolling cylinder using high-speed thermal spraying

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572777A (en) * 1969-05-05 1971-03-30 Armco Steel Corp Multiple seal, double shoulder joint for tubular products
US6296953B1 (en) * 1997-08-12 2001-10-02 Sandvik Ab Steel alloy for compound tubes
US6761751B2 (en) * 2000-01-01 2004-07-13 Sandvik Ab Method of making a FeCrAl material and such material

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Publication number Priority date Publication date Assignee Title
FR695339A (en) * 1930-05-08 1930-12-13 Welding assembly process for metal pipes
JPH09257167A (en) * 1996-03-19 1997-09-30 Daiwa House Ind Co Ltd Structure of joint part of piping and its manufacture
JPH11209850A (en) * 1998-01-23 1999-08-03 Jgc Corp Heating furnace tube, and use of heating furnace tube
TW494201B (en) * 2001-08-08 2002-07-11 Jgc Corp Connection method and structure for pipe with poor weldability for high temperature application

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572777A (en) * 1969-05-05 1971-03-30 Armco Steel Corp Multiple seal, double shoulder joint for tubular products
US6296953B1 (en) * 1997-08-12 2001-10-02 Sandvik Ab Steel alloy for compound tubes
US6761751B2 (en) * 2000-01-01 2004-07-13 Sandvik Ab Method of making a FeCrAl material and such material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10260370B2 (en) 2014-12-10 2019-04-16 General Electric Company Nanostructured ferritic alloy components and related articles
US10480332B2 (en) 2014-12-10 2019-11-19 General Electric Company Rotors and methods of making the same

Also Published As

Publication number Publication date
SE0401139L (en) 2005-10-31
KR20070005711A (en) 2007-01-10
WO2005105362A1 (en) 2005-11-10
EP1744854A1 (en) 2007-01-24
CN1950171A (en) 2007-04-18
SE528132C2 (en) 2006-09-12
SE0401139D0 (en) 2004-04-30
JP2007535409A (en) 2007-12-06

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