WO2017207660A1 - Method for producing an elongated hollow body consisting of steel and having a polygonal, in particular square or rectangular, cross-section - Google Patents
Method for producing an elongated hollow body consisting of steel and having a polygonal, in particular square or rectangular, cross-section Download PDFInfo
- Publication number
- WO2017207660A1 WO2017207660A1 PCT/EP2017/063206 EP2017063206W WO2017207660A1 WO 2017207660 A1 WO2017207660 A1 WO 2017207660A1 EP 2017063206 W EP2017063206 W EP 2017063206W WO 2017207660 A1 WO2017207660 A1 WO 2017207660A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hollow body
- final
- intermediate hollow
- shaping
- temperature
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 35
- 239000010959 steel Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000007493 shaping process Methods 0.000 claims abstract description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 238000012360 testing method Methods 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 31
- 230000001066 destructive effect Effects 0.000 claims abstract description 13
- 230000009466 transformation Effects 0.000 claims abstract description 4
- 238000009659 non-destructive testing Methods 0.000 claims description 26
- 238000005096 rolling process Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 9
- 239000006249 magnetic particle Substances 0.000 claims description 7
- 238000003483 aging Methods 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000013100 final test Methods 0.000 claims description 3
- 238000011089 mechanical engineering Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 230000007547 defect Effects 0.000 description 11
- 239000000047 product Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009439 industrial construction Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- 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
- 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
- C21D9/085—Cooling or quenching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes 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
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/155—Making tubes with non circular section
Definitions
- the invention relates to a method for producing a non-destructively tested elongated hollow body consisting of steel and having a polygonal, in particular square or rectangular, cross-section, in which an intermediate hollow body having a round cross-section is produced in each case from a flat pre-material or an intermediate hollow body having a round cross-section is produced from a block-shaped pre-material, whereby the intermediate hollow body is cooled or quenched with partial or full phase transformation.
- Hot-finished, square or rectangular hollow profiles are characterised by smaller corner radii than in the case of cold-finished profiles and thus have larger cross-sectional areas. Therefore, a higher load can be accommodated with identical profile dimensions.
- German laid open document DE 2 348 152 discloses a method for producing elongate hollow bodies consisting of steel and having a polygonal cross-section.
- a hollow steel pipe having a substantially round cross-section is hot-rolled and is then austenitised in a gas-heated oven with an excess of air and above an Ac3 temperature of the steel in question.
- the austenitising temperature is preferably between 871 and 954°C.
- quenching occurs in water to a temperature of less than 93°C and then heating occurs to a tempering temperature which is above a stress-relief annealing temperature and below an Ac1 temperature of the steel in question.
- the tempering temperature is between 621 and 663°C.
- the steel pipe is tempered at this temperature and is rolled out within the tempering temperature range to the desired polygonal cross-sectional shape, in particular to that of a rounded rectangle and is then cooled in air.
- the hollow bodies produced according to this method are intended to be free of surface defects, such as e.g. buckling, and to have high yield stresses, distinctive notch impact strength and strain properties as a result of the quenching and tempering steps.
- a suitable pre-material for the method is an Si-AI-killed steel having approximately 0.2% carbon, 1.45% Mn and 0.06% V steel, which is martensitic and has good weldability.
- German laid open document DE 197 03 586 shows a method for producing elongated hollow steel bodies having a polygonal cross-section.
- an intermediate hollow body having a polygonal cross-section is obtained by squeeze-moulding and welding.
- the intermediate hollow body has a curvature radius in its edge region being larger than the respective curvature radius of the final elongate hollow steel body having a polygonal cross-section.
- the intermediate hollow body is heated in an oven and is finally rolled.
- the curvature radii are decreased to reach the desired shape of the final elongate hollow steel body having a polygonal cross-section.
- the European patent EP 0 485 572 discloses a method for producing a seamless steel pipe having a round cross-section. This method describes producing an intermediate hollow body having a round cross-section from a round block-shaped pre- material.
- a testing apparatus is arranged at a suitable position, especially between a rolling mill and a cooling bed, within the production line in order to test the pipe for dimensional changes or flaws. The achieved testing results are used to provide control information for the production method.
- the testing apparatus has a source/detector apparatus using a penetrative source of radiation, e.g. X-ray or gamma ray beam, for nondestructive testing.
- German laid open document DE 10 2012 006 472 teaches the production of welded steel pipes having a round cross-section from a flat pre-material.
- This flat pre- material undergoes a non-destructive control via ultrasound or eddy current testing before U-/0-forming and welding.
- homogeneity of material properties is continuously or discontinuously obtained to provide control information for the production method.
- non-destructive testing in particular ultrasonic testing for defects, in particular laminar imperfections and inclusions, of hollow bodies consisting of steel and having a square or rectangular cross-section is not possible.
- hollow bodies consisting of steel and having a polygonal, in particular square or rectangular, cross-section are rolled and heat-treated in various steps.
- concavities, convexities, twisting and deviations in squareness and straightness occur owing to a separate heat-treatment step.
- the object of the invention is to provide a method for producing an elongated hollow body consisting of steel and having a polygonal, in particular square or rectangular, cross- section which is characterised by produced hollow bodies having increased dimensional stability, in particular narrow dimension tolerances.
- the hollow bodies are heat-treated and tested in a non-destructive manner.
- an intermediate hollow body having a round cross-section is produced from a flat pre-material or an intermediate hollow body having a round cross- section is produced from a block-shaped pre-material whereby the intermediate hollow body is cooled or quenched with partial or full phase transformation
- the intermediate hollow body is tested in a non-destructive manner preferably at lower temperatures, especially at room temperature, and the intermediate hollow body is final-shaped without intended change (intended reduction or intended increase) of the wall thickness of the intermediate hollow body to form a final hollow body having a polygonal, in particular square or rectangular, cross-section, in particular having rounded corners
- a logarithmic reduction ln(C0/C1 ) of a starting periphery CO of the intermediate hollow body occurs during an in particular multi-stage shaping to a final periphery of the hollow body in a range between 0 and 0.3, wherein an extension of the hollow body outweighs an increase in the wall thickness.
- the shaping speed is between about 0.2 and 5 m/s, preferably between about 0.5 and 5 m/s.
- the final-shaping of the intermediate hollow body is more or less a thermo- mechanical shaping step, in particular a drawing or stretching or pressing, especially a roll-drawing or roll-stretching or roll-pressing.
- the term "without intended change" in the feature "the intermediate hollow body is final-shaped without intended change of the wall thickness of the intermediate hollow body to form a final hollow body” is to be understood that the average wall thickness of the intermediate hollow body is amended (reduced or increased) by less than 10%, preferably less than 5%, compared with the wall thickness of the hollow body having a polygonal, in particular square or rectangular, cross-section.
- the wall thickness is to be understood as an average wall thickness.
- non-destructive testing is understood to mean at least one of the following testing methods or combinations thereof. The nondestructive testing occurs prior to or after a heat treatment (e.g. quenching, normalising, soft annealing) of the hollow body.
- a test frequency for ultrasonic testing methods is in the range of 2-25 MHz;
- reflection/reference defects e.g. flat bottom bores
- the non-destructive testing of the intermediate hollow body is an eddy current testing or ultrasonic testing or a combination hereof.
- the term "immediately” in the feature "under final-heat-treating of the intermediate hollow body immediately prior to the final-shaping" is understood to mean that the time frame between the final-heat-treating and the final- shaping is less than 5 minutes, preferably less than 60 seconds.
- room temperature in the feature "the intermediate hollow body is at room temperature for the non-destructive testing” is understood to mean a temperature of the intermediate hollow body that is between 5 °C to 60 °C.
- the non-destructive testing of the intermediate hollow body is carried out after the intermediate heat treatment of the intermediate hollow body or prior to the final-shaping of the intermediate hollow body to control if requirements of customers for the final hollow body-product are met.
- the final hollow body having a polygonal, in particular square or rectangular, cross-section will not be tested any more.
- the core idea of the invention is to rely on non-destructive testing results before final- shaping in order to meet the customers' demands. Additionally, non-destructive testing takes place on the seamless or the welded intermediate hollow body prior to the intermediate or final heat treatment of the intermediate hollow body or on the flat pre- material for a welded intermediate body.
- non-destructive testing takes place on the hollow body after final-shaping externally in the region of its corners and/or ends.
- the non-destructive testing for defects in the wall of the intermediate hollow body e.g. for laminar imperfections, can be effected with conventional ultrasonic testing facilities using typical testing standards for hollow bodies having a circular cross-section.
- testing is effected in this initial state by means of conventional ultrasonic testing facilities more typically used for this semi-finished product. Since the ultimate shaping of the intermediate hollow body having a round cross-section to form a hollow body having a polygonal cross-section is effected within a provided heat treatment step, very narrow dimension tolerances can be maintained for the hollow body.
- heat treatments such as cooling with water, oil or polymers also take place after austenitising the intermediate hollow body prior to ultrasonic testing.
- the final-heat treatment e.g. tempering, normalising, age hardening or dual-phase annealing
- the final-heat treatment is effected during or immediately prior to the final-shaping to form a hollow body consisting of steel and having a polygonal, in particular square or rectangular, cross-section.
- reheating the intermediate hollow body to the predefined temperature range in order to achieve the desired mechanical properties, lasts for at least 1 minute per mm of wall thickness and at the most 6 minutes per mm of wall thickness if heated in an oven using inductive heating lower times can be used.
- the intermediate hollow body in terms of a pre-normalising step, provision is preferably made that the intermediate hollow body is intermediately heat treated prior to the final-shaping, in particular by heating above an Ac3 temperature of the corresponding steel in order to austenitise and subsequently cool the intermediate hollow body prior to the final-shaping.
- heating to an Ac3 temperature of the corresponding steel + 20 Kelvin, preferably to 870 to 980°C, maintaining said temperature for at least 5 minutes, and cooling with water, oil or polymers prior to the final-shaping are provided.
- this cooling step diffusion processes in the intermediate hollow body are minimised or avoided.
- a subsequent final-heat treatment is in the form of tempering at a temperature between 580°C and Ac1 - 20 Kelvin with this temperature being maintained for between 5 and 60 minutes, which is performed immediately prior to the final-shaping or with the final-shaping of the intermediate hollow body in a common step.
- the hollow body is final-heat treated in the form of normalising at a temperature of at least Ac3 + 20 Kelvin with this temperature being maintained for at least 5 minutes.
- the hollow body is final-heat treated in the form of dual-phase annealing at a temperature between Ac1 and Ac3 and with this temperature being maintained for 5 to 60 minutes.
- the obtained dual-phase microstructure can consist of combinations of ferrite, perlite, bainite, residual austenite and martensite.
- the non-destructive testing is effected as eddy current testing or ultrasonic testing or as a combination thereof. Defects in the surface of the seamless or welded intermediate hollow body or of the flat pre-material can be detected by the eddy current testing and defects in the wall of the seamless or welded intermediate hollow body or of the flat pre-material can be detected by the ultrasonic testing.
- the method can begin with shaping, in particular bending and/or rolling, the flat pre-material to form a slotted hollow body having adjoining abutment ends, and welding the abutment ends to form a welded intermediate hollow body having a round cross-section, or with shaping, in particular rolling, the block-shaped pre-material to form a seamless intermediate hollow body having a round cross-section.
- known steels are used in this case.
- the flat pre-material in the form of strips or sheets can be cold-shaped or hot-shaped.
- a combination of separate or integrated shaping steps is used, such as piercing, reducing the wall thickness and stretching, optionally flattening the surface and optionally rolling to size to a defined outer diameter prior to or in combination with a heat treatment.
- Internal tools are used for piercing, reducing the wall thickness and flattening. Rolling to size occurs without an internal tool.
- a logarithmic surface reduction ln(D0/(2 * S1 )) over the entire shaping of the block-shaped pre-material with a diameter DO to form intermediate hollow bodies having a round cross-section with a wall thickness S1 is preferably between 0.6 and 4.0.
- the intermediate hollow body is final-shaped immediately after the final-heat treatment at a temperature between 550°C and Ac1 - 20 Kelvin or at a temperature of at least Ac3 + 20 Kelvin and thus in the temperature ranges of hardening or normalising.
- the present invention is particularly suitable for producing hollow bodies, in particular hollow profiles, having a polygonal, in particular square or rectangular, cross-section having rounded corners which are then used in the steel industry, in particular for cranes, in mechanical engineering, offshore applications, deep sea applications and wind turbines as well as for components subjected to high levels of vibration.
- a rectangular final hollow body was produced experimentally from steel grade API 5L X70Q having the dimensions 200 mm x 140 mm and a wall thickness of 6.3 mm.
- austenitising heating to and maintaining at a temperature of greater than Ac3
- ultrasonic testing of the intermediate hollow body having a round cross-section was performed.
- simultaneous final-shaping and tempering were performed at a tempering temperature of 550 to 750°C.
- the then measured tolerances met the specifications from standard EN 10210-2:2006. Also, no cracks occurred in the corners of the hollow body. Corresponding magnetic particle testing was performed.
- a square hollow body in particular a hollow profile, was produced experimentally from steel grade S355G15+N pursuant to EN 10225:2009 having the dimensions 160 mm x 160 mm and a wall thickness of 10 mm.
- ultrasonic testing was performed.
- the intermediate hollow body was final-shaped into its ultimate dimensions at a normalising temperature between 880 and 960°C.
- the then measured tolerances met the specifications from standard EN 10210-2:2006.
- Corresponding magnetic particle testing was performed.
- the mechanical properties met the specification from standard EN
- the device for final-shaping is to be arranged immediately downstream of the heat treatment oven in the normal product sequence.
- Figure 1 shows a process flow chart of an exemplified embodiment.
- a flat pre-material 1 a is tested in a nondestructive manner by means of a non-destructive testing device 3a.
- a slotted hollow body having adjoining abutment ends is produced from the flat pre-material 1 a by shaping, in particular bending and/or rolling.
- the abutment ends are welded to form a welded intermediate hollow body having a round cross-section 2b.
- this intermediate hollow body 2b can be tested in a non-destructive manner by means of an alternative or additional non-destructive testing device 3a.
- a seamless intermediate hollow body having a round cross-section 2c is produced from a block-shaped pre-material 1 b. Shaping, in particular rolling, is used as the production method.
- This seamless intermediate hollow body having a round cross-section 2c is tested in a non-destructive manner by means of a non-destructive testing device 3a.
- intermediate hollow bodies having a round cross-section 2b, 2c are subjected to an intermediate heat treatment depending upon the respective material.
- This intermediate heat treatment consists of intermediate heating of the intermediate hollow body 2b, 2c in an intermediate heating oven 4a and subsequent cooling of the intermediate hollow body 2b, 2c in an intermediate cooling path 4b prior to the final- shaping to form an intermediate hollow body having a round cross-section with intermediate heat treatment 2b', 2c'.
- the intermediate hollow body having a round cross-section 2b, 2c can be tested in a non-destructive manner before the intermediate heat treatment 2b', 2c' by means of an alternative or additional non-destructive testing device 3a.
- the non-destructive testing takes place after the intermediate shaping and prior to the final-shaping by means of one or a plurality of non-destructive testing devices 3a at different positions during the production process.
- the intermediate hollow bodies 2b' or 2c' are subjected to a final-heat treatment in a final-heating oven 5a and a final-shaping device 5b in order to obtain a hollow body 6 having a polygonal, in particular square or rectangular, cross-section.
- the final-heat treatment and final-shaping can be performed in a common step.
- the final hollow body 6 is externally tested in the region of its corners, edges and/or ends using a non-destructive final testing device 7, in particular a magnetic particle testing device.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018561642A JP7051718B2 (en) | 2016-05-31 | 2017-05-31 | A method for producing an elongated hollow body composed of steel material and having a polygonal cross section, particularly a quadrangular or rectangular cross section. |
CN201780033095.9A CN109311071B (en) | 2016-05-31 | 2017-05-31 | Method for producing an elongated hollow body made of steel and having a polygonal, in particular square or rectangular cross section |
ES17729820T ES2927705T3 (en) | 2016-05-31 | 2017-05-31 | Method for producing an elongated hollow body consisting of steel and having a polygonal, in particular square or rectangular cross section |
EP17729820.5A EP3463706B1 (en) | 2016-05-31 | 2017-05-31 | Method for producing an elongated hollow body consisting of steel and having a polygonal, in particular square or rectangular, cross-section |
BR112018074664-9A BR112018074664B1 (en) | 2016-05-31 | 2017-05-31 | METHOD FOR PRODUCING AN Elongated HOLLOW BODY CONSISTING OF STEEL AND HAVING A POLYGONAL CROSS SECTION, IN PARTICULAR SQUARE OR RECTANGULAR |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016110045.5A DE102016110045A1 (en) | 2016-05-31 | 2016-05-31 | Process for producing an elongated hollow body made of steel with a polygonal, in particular square or rectangular, cross section |
DE102016110045.5 | 2016-05-31 | ||
DE102017100185.9 | 2017-01-06 | ||
DE102017100185 | 2017-01-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017207660A1 true WO2017207660A1 (en) | 2017-12-07 |
Family
ID=59055191
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2017/063206 WO2017207660A1 (en) | 2016-05-31 | 2017-05-31 | Method for producing an elongated hollow body consisting of steel and having a polygonal, in particular square or rectangular, cross-section |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP3463706B1 (en) |
JP (1) | JP7051718B2 (en) |
CN (1) | CN109311071B (en) |
BR (1) | BR112018074664B1 (en) |
ES (1) | ES2927705T3 (en) |
WO (1) | WO2017207660A1 (en) |
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JPH0938721A (en) * | 1995-07-28 | 1997-02-10 | Nakajima Kokan Kk | Production of square steel tube |
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CN100489263C (en) * | 2007-01-31 | 2009-05-20 | 天津钢管集团股份有限公司 | Technology for manufacturing collar thick-wall seamless steel pipe |
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CN101670520A (en) * | 2009-09-17 | 2010-03-17 | 苏州贝思特金属制品有限公司 | Method for manufacturing seamless steel tube |
JP5862328B2 (en) * | 2011-01-31 | 2016-02-16 | Jfeスチール株式会社 | Steel cleanliness evaluation method |
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2017
- 2017-05-31 WO PCT/EP2017/063206 patent/WO2017207660A1/en unknown
- 2017-05-31 EP EP17729820.5A patent/EP3463706B1/en active Active
- 2017-05-31 ES ES17729820T patent/ES2927705T3/en active Active
- 2017-05-31 CN CN201780033095.9A patent/CN109311071B/en active Active
- 2017-05-31 BR BR112018074664-9A patent/BR112018074664B1/en active IP Right Grant
- 2017-05-31 JP JP2018561642A patent/JP7051718B2/en active Active
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WO2015022294A1 (en) * | 2013-08-14 | 2015-02-19 | Vallourec Deutschland Gmbh | Method for producing a quenched and tempered seamlessly hot-fabricated steel pipe |
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EP3463706B1 (en) | 2022-07-20 |
ES2927705T3 (en) | 2022-11-10 |
BR112018074664B1 (en) | 2024-01-09 |
CN109311071B (en) | 2024-03-08 |
EP3463706A1 (en) | 2019-04-10 |
CN109311071A (en) | 2019-02-05 |
BR112018074664A2 (en) | 2019-03-06 |
JP7051718B2 (en) | 2022-04-11 |
JP2019523709A (en) | 2019-08-29 |
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