EP2682485B1 - Method and device for producing steel pipes with special properties - Google Patents
Method and device for producing steel pipes with special properties Download PDFInfo
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- EP2682485B1 EP2682485B1 EP13187253.3A EP13187253A EP2682485B1 EP 2682485 B1 EP2682485 B1 EP 2682485B1 EP 13187253 A EP13187253 A EP 13187253A EP 2682485 B1 EP2682485 B1 EP 2682485B1
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- 229910000831 Steel Inorganic materials 0.000 title claims description 10
- 239000010959 steel Substances 0.000 title claims description 10
- 238000000034 method Methods 0.000 title description 9
- 238000001816 cooling Methods 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 26
- 239000002826 coolant Substances 0.000 claims description 25
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 2
- 239000011575 calcium Substances 0.000 claims 2
- 239000011651 chromium Substances 0.000 claims 2
- 239000010949 copper Substances 0.000 claims 2
- 239000011572 manganese Substances 0.000 claims 2
- 239000010955 niobium Substances 0.000 claims 2
- 239000010936 titanium Substances 0.000 claims 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- 238000005275 alloying Methods 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 229910052791 calcium Inorganic materials 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 claims 1
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 239000011733 molybdenum Substances 0.000 claims 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims 1
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- 239000011574 phosphorus Substances 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims 1
- 239000000523 sample Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 235000019362 perlite Nutrition 0.000 description 3
- 239000010451 perlite Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910006638 Si—Mn—Al Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- 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
-
- 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
- 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
Definitions
- the invention relates to a device for producing pipes with a special property profile with a device for coolant treatment of a pipe surface.
- the properties of the material of the tube wall can have significant differences locally and los related. These property differences are usually based on an uneven microstructure and on an unfavorable steel composition or an increased proportion of accompanying and impurity elements.
- Tubes with a length of 7 m and larger and an outer diameter of less than 200 mm with a wall thickness of less than 25 mm can be subject to a heat treatment only with great effort, which provides a uniformly fine structure with the desired structure over the entire tube volume and bending perpendicular minimized to the longitudinal direction.
- the WO 98/38345 discloses a method and apparatus for producing welded tubing in which rolled sheet having contents of C, Mn, Ni, Nb, Ti and N is subjected to a double-sided heat treatment, rolled up in the longitudinal direction by multi-layer welding Tube is formed.
- the JP 54037011 A discloses a switchable continuous hardening plant for pipes with an outer coolant supply part and of this inwardly directed, in the passage direction of the pipe inclined concentric nozzles or coolant supplies, which can be interrupted by shading.
- a particular embodiment of a spray cooling system of cooling rings discloses the US 2007/181234 A1 , wherein the cooling rings can be positioned independently of each other.
- a flat circular Sprühstoffstrom each cooling ring is directed from a coaxial annular gap in the direction of passage of the material to be cooled obliquely-axially on this, in each case the next front cooling ring has a beam protection for the flat beam reflected by the refrigerated goods.
- the object of the invention to provide an apparatus for producing tubes made of steel with increased strength and improved toughness of the material by rapid cooling after deformation, consisting of a device for coolant loading a pipe surface, is achieved with the characteristics according to claim 1, wherein in Rolling direction after the last deformation stand a switchable fürgangsKühlrange is formed with a plurality of concentrically arranged around the rolling, longitudinally differently positionable distributor rings for the cooling medium in each case with at least 3, each directed substantially to the Ax nozzles, each distributor ring or each group of the same throughput controlled the cooling medium is anspeisbar.
- a device according to the invention it is advantageously possible with a device according to the invention to subject tubes having a different longitudinal extent and with different diameters and wall thicknesses to a targeted heat treatment from the rolling heat, such that a desired microstructure, which is represented uniformly over the tube length, can be obtained.
- the coolant stream can be designed in each case as a spray stream of coolant, usually water, and / or as a spray stream of coolant and air and / or as a gas stream.
- Essential to the invention are a switchability and throughput controllability of the coolant flows in the through-flow cooling section.
- regulations for tube cooling with position and temperature sensors are used to control the coolant flows.
- Example 1 from tube pre-material of the same mother melt with a chemical composition in wt .-% according to Tab. 1 description C Si Mn P S Cr Ni Cu al Not a word Fe RVM ⁇ 0.1819 0.2910 1.4231 0.0146 0.0065 0.0415 0.0275 0.0211 0.0274 0.0126 rest Finally, by means of stretch-reducing tubes with the following dimensions were produced: Pipe length (rolling stock) (L) 19,300.00 mm Pipe diameter ( ⁇ ) 146.00 mm Pipe wall thickness 9.70 mm
- the tube was introduced after a time of 12 sec at a temperature of 880 ° C in a through-cooling.
- microstructure revealed that at most there was in each case an advantageously rectified microstructure, essentially without texture, but with a grain size and microstructure distribution dependent on the final cooling temperature.
- Fig. 1 shows a structure of sample P1, wherein a particle size of 20 to 30 microns was present at high ferrite content.
- the further structural component was essentially perlite.
- Perlite and microstructures of the upper intermediate or upper bainite were the other components of the compensation structure.
- Fig. 5 shows in a bar graph the measured values yield strength (Rp) (0.2) [MPa], tensile strength (Rm) [MPa], constriction (Ac) [%] and toughness (KV450) [J] of the samples P1 to P4, ie depending on the achieved by the different cooling parameters in the annealing technology, mechanical material properties.
- the yield strength of the material of the pipe wall can be increased by a process according to the invention from 424 [MPa] to 819 [MPa] and at the same time minimizing the drop of the elongation values from 26 [%] to 10 [%], the material toughness from 170 [J] to 160 [J] decreased.
- microstructures in the material are adjustable, resulting in the property profile of the pipe wall results.
- sample tube P4 owing to the low transformation temperature, a high degree of conversion into a lower bainitic structure of the microstructure could be achieved, as a result of which an increase in the toughness of the material could be achieved.
- Fig. 6 shows the measured hardness values over the pipe length of test tubes P1 and P4.
- Fig. 7 the hardness profile of the material in the quadrant is shown over the pipe wall thickness of the test tube P2.
- the measurement results of the four quadrants Q1 to Q4 are averages of four spaced measurements per quadrant in the outer, middle and inner regions of the tube wall.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Description
Die Erfindung betrifft eine Vorrichtung zur Herstellung von Rohren mit besonderem Eigenschaftsprofil mit einer Einrichtung zur Kühlmittelbeaufschlagung einer Rohroberfläche.The invention relates to a device for producing pipes with a special property profile with a device for coolant treatment of a pipe surface.
Bei einer Fertigung von Nahtlosrohren können die Eigenschaften des Werkstoffes der Rohrwand örtlich und losbezogen erhebliche Unterschiede aufweisen. Diese Eigenschaftsunterschiede beruhen zumeist auf einer ungleichen Gefügestruktur und auf einer ungünstigen Stahlzusammensetzung bzw. einem erhöhten Anteil an Begleit- und Verunreinigungselementen.In a production of seamless tubes, the properties of the material of the tube wall can have significant differences locally and los related. These property differences are usually based on an uneven microstructure and on an unfavorable steel composition or an increased proportion of accompanying and impurity elements.
Für hochbeanspruchte Rohre soll aus obigen Gründen eine den Anforderungen entsprechende Gefügestruktur mit in engen Grenzen gegebener Gleichmäßigkeit über die Rohrlänge sowie koaxial in der Rohrwand und eine von schädlichen Elementen freie Werkstoffzusammensetzung gegeben sein.For highly stressed pipes should be given for the above reasons, a structure corresponding to the requirements with given within narrow limits uniformity over the pipe length and coaxial in the pipe wall and a free of harmful elements material composition.
Rohre mit einer Länge von 7 m und größer und einem Außendurchmesser von kleiner 200 mm bei einer Wandstärke von unter 25 mm lassen sich nur mit hohem Aufwand einer Wärmebehandlung unterwerfen, die ein gleichmäßig feines Gefüge mit gewünschter Struktur über das gesamte Rohrvolumen erbringt und ein Verbiegen senkrecht zur Längsrichtung minimiert.Tubes with a length of 7 m and larger and an outer diameter of less than 200 mm with a wall thickness of less than 25 mm can be subject to a heat treatment only with great effort, which provides a uniformly fine structure with the desired structure over the entire tube volume and bending perpendicular minimized to the longitudinal direction.
Es sind Verfahren bekannt, bei welchen ein Rohr um dessen Achse gedreht und an der Außen- und/oder Innenoberfläche gekühlt wird. Derartige Wärmebehandlungsverfahren setzen jedoch eine etwa gleich hohe Temperatur des Werkstoffes über die Rohrlänge voraus, um einen homogenen Gefügeaufbau in der Wandung zu erreichen.Methods are known in which a tube is rotated about its axis and cooled on the outer and / or inner surface. However, such heat treatment methods require an approximately equal temperature of the material over the pipe length in order to achieve a homogeneous structural structure in the wall.
Die
Aus der
Die
Zur Verstärkung von Automobiltüren wurde bereits ein Stahlrohr mit einer hohen Zugfestigkeit und hervorragenden 3-Punkt-Biegeeigenschaften gemäß
Eine besondere Ausbildungsform eines Sprüh-Kühlungssystems von Kühlringen offenbart die
Die Aufgabe der Erfindung, eine Vorrichtung zur Herstellung von Rohren aus Stahl mit erhöhter Festigkeit und verbesserter Zähigkeit des Werkstoffes durch Schnellabkühlung nach dem Verformen, bestehend aus einer Einrichtung zur Kühlmittelbeaufschlagung einer Rohroberfläche, zu erstellen, wird mit den erfindungsgemäßen Kennzeichen nach Anspruch 1 gelöst, wobei in Walzrichtung nach dem letzten Verformungsgerüst eine schaltbare DurchgangsKühlstrecke mit einer Vielzahl von konzentrisch um das Walzgut angeordneten, in Längsrichtung unterschiedlich positionierbaren Verteilerringen für das Kühlmedium jeweils mit mindestens 3, jeweils im Wesentlichen zur Axe gerichteten Düsen ausgeformt ist, wobei jeder Verteilerring oder jede Gruppe derselben durchsatzgeregelt mit dem Kühlmedium anspeisbar ist.The object of the invention to provide an apparatus for producing tubes made of steel with increased strength and improved toughness of the material by rapid cooling after deformation, consisting of a device for coolant loading a pipe surface, is achieved with the characteristics according to
Mit Vorteil ist es bei einer erfindungsgemäßen Einrichtung möglich, Rohre mit einer unterschiedlich großen Längserstreckung und mit unterschiedlichen Durchmessern und Wandstärken einer gezielten Wärmebehandlung aus der Walzhitze zu unterwerfen, wobei derart eine gewünschte Gefügestruktur, welche über die Rohrlänge gleichmäßig dargestellt ist, erhalten werden kann.It is advantageously possible with a device according to the invention to subject tubes having a different longitudinal extent and with different diameters and wall thicknesses to a targeted heat treatment from the rolling heat, such that a desired microstructure, which is represented uniformly over the tube length, can be obtained.
Als besonders günstig betreffend die Gleichmäßigkeit des Vergütungsgefüges sowohl umfänglich als auch in Längsrichtung der Rohrwandung hat sich ergeben, wenn die Düsen jeweils einen sich in Sprührichtung erweiternden, pyramidenförmigen Kühlmittelstrom erstellen.As particularly favorable regarding the uniformity of the compensation structure both circumferentially and in the longitudinal direction of the pipe wall has been found when the nozzles each create a pyramidal coolant flow which expands in direction of spraying.
Der Kühlmittelstrom kann dabei jeweils als Sprühstrom von Kühlmittel, zumeist Wasser, und/oder als Sprühnebelstrom aus Kühlmittel und Luft und/oder als Gasstrom ausgebildet sein.The coolant stream can be designed in each case as a spray stream of coolant, usually water, and / or as a spray stream of coolant and air and / or as a gas stream.
Vorteilhafte Ergebnisse betreffend eine gleichmäßig hohe Rohrgüte konnten auch erreicht werden, wenn der Kühlmittelstrom eine rechteckige Querschnittsform aufweist und die längere Axe des Rechteckes schräg zur Rohrachse gerichtet ist.Advantageous results regarding a uniformly high tube quality could also be achieved if the coolant flow has a rectangular cross-sectional shape and the longer axis of the rectangle is directed obliquely to the tube axis.
Erfindungswesentlich sind eine Schaltbarkeit und eine Durchsatzregelbarkeit der Kühlmittelströme in der Durchgangskühlstrecke.Essential to the invention are a switchability and throughput controllability of the coolant flows in the through-flow cooling section.
Wenn eine Zufuhr von Kühlmedium zur Durchgangskühlstrecke in Abhängigkeit von der Position der Rohrenden in dieser schaltbar ist, kann in günstiger Weise ein Eindringen von Kühlmedium in das Rohrhohl vermieden werden, wodurch eine im Querschnitt im Wesentlichen einseitige Innenkühlung vermieden und eine Verbiegung sowie ungleiche Gefügestrukturausbildung hintangehalten werden.If a supply of cooling medium to the through-cooling path in dependence on the position of the pipe ends in this switchable, can be avoided in a favorable manner penetration of cooling medium into the hollow tube, thereby avoiding a cross-section substantially unilateral internal cooling and a Bending and unequal microstructure education be obstructed.
Mit Vorteil werden erfindungsgemäß Regelungen für die Rohrkühlung mit Positions- und Temperatursensoren zur Steuerung der Kühlmittelströme verwendet.Advantageously, according to the invention, regulations for tube cooling with position and temperature sensors are used to control the coolant flows.
Im Folgenden wird die Erfindung anhand von lediglich einen Ausführungsweg darstellenden Beispielen näher erläutert.In the following, the invention will be explained in more detail by way of examples which illustrate only one embodiment.
Beispiel 1: aus Rohrvormaterial der gleichen Mutterschmelze mit einer chemischen Zusammensetzung in Gew.-% gemäß Tab. 1
Nach dem letzten Stich bzw. nach einer Letztverformung im Auslaufgerüst der Streckreduzieranlage wurde das Rohr nach einer Zeit von 12 sec mit einer Temperatur von 880°C in eine Durchgangskühlstrecke eingebracht.After the last pass or after a final deformation in the outlet framework of the stretch-reducing plant, the tube was introduced after a time of 12 sec at a temperature of 880 ° C in a through-cooling.
Unter Zugrundelegung des festgestellten Umwandlungsverhaltens des Stahles erfolgte im Rahmen von Untersuchungen an einzelnen Losen bei der Rohrherstellung eine gezielte Beaufschlagung lediglich der Rohraußenoberfläche, wobei an dieser durch Einstellung des Kühlmittelstromes eine Abkühlgeschwindigkeit von ca. 6°C/sec gemessen wurde, auf folgende Endtemperaturen:
Nach Erreichen dieser vorgesehenen Abkühlungs-Endtemperaturen erfolgte eine Abschaltung der Kühlmittelzufuhr und derart eine weitere Abkühlung des Rohres mit geringer Intensität im Wesentlichen an ruhender Luft auf Raumtemperatur.After reaching these intended cooling end temperatures was a shutdown of the coolant supply and such a further cooling of the tube with low intensity substantially in still air to room temperature.
Aus den unterschiedlich wärmebehandelten Rohren wurden jeweils Proben mit den Bezeichnungen P1 bis P4 entnommen und Werkstoffuntersuchungen zugeführt.From the differently heat-treated tubes, samples were taken with the names P1 to P4 and fed material investigations.
Die Ermittlung der Gefügestruktur ergab, dass allenfalls jeweils ein vorteilhaft gleichgerichtetes Gefüge, im Wesentlichen ohne Textur, jedoch mit einer von der Kühl-Endtemperatur abhängigen Korngröße und Gefügeverteilung vorlag.The determination of the microstructure revealed that at most there was in each case an advantageously rectified microstructure, essentially without texture, but with a grain size and microstructure distribution dependent on the final cooling temperature.
In
Aus
Das Gefüge der Rohrwand P4, welches bei einer Schnellkühlung nach der Verformung auf eine Kühlendtemperatur T4 = 300°C gebildet wurde, zeigt
Bei einer Abkühlung der Rohrwand mit einer Geschwindigkeit von größer als 1°C/sec unmittelbar nach der Warmumformung des Eisenbasiswerkstoffes kann eine derart geformte Austenitstruktur, wie gefunden wurde, gegenüber dem Gleichgewicht weitgehend unterkühlt werden, wobei in der Folge in Abhängigkeit vom Ausmaß der Unterkühlung und des Keimzustandes eine Gefügeumwandlung erfolgt. Mit Vorteil kann mittels des erfindungsgemäßen Verfahrens über die gesamte Länge eines Rohres und in überraschender Weise, auch über den Querschnitt eine gewünschte, gleichmäßige Gefügestruktur eingestellt werden, welche Gefügestruktur auch die Werkstoffeigenschaften bestimmt. Mit anderen Worten: Werden von einem Rohr grundlegende Werkstoffeigenschaften gefordert, ist eine Legierungswahl angezeigt. Ein vorgesehenes, vorteilhaftes und günstiges Eigenschaftsprofil des Werkstoffes kann durch ein erfindungsgemäßes Verfahren in der erfindungsgemäßen Vorrichtung erreicht werden.Upon cooling of the tube wall at a rate of greater than 1 ° C / sec immediately after hot working of the iron base material, such shaped austenite structure has been found to be largely undercooled with respect to equilibrium, as a result depending on the degree of supercooling and the germ state a structural transformation takes place. Advantageously, by means of the method according to the invention over the entire length of a tube and in a surprising manner, also over the cross section, a desired, uniform microstructure can be set, which microstructure also determines the material properties. In other words, if basic material properties are required of a pipe, an alloy choice is indicated. An intended, advantageous and favorable property profile of the material can be achieved by a method according to the invention in the device according to the invention.
Bei gleicher Stahlzusammensetzung kann nach einem Streckreduzieren die Dehngrenze des Werkstoffes der Rohrwand mittels eines erfindungsgemäßen Verfahrens von 424 [MPa] auf 819 [MPa] erhöht und gleichzeitig der Abfall der Dehnwerte von 26 [%] auf 10 [%] minimiert werden, wobei die Materialzähigkeit von 170 [J] auf 160 [J] abnahm.With the same steel composition, the yield strength of the material of the pipe wall can be increased by a process according to the invention from 424 [MPa] to 819 [MPa] and at the same time minimizing the drop of the elongation values from 26 [%] to 10 [%], the material toughness from 170 [J] to 160 [J] decreased.
Bei hohen Abkühlungsendtemperaturen, wie dies beispielsweise für das Probematerial P1 gilt, ist ein hohes Ausmaß an Rekristallisation und Grobkornbildung gegeben, was zwar hohe Zähigkeit und Einschnürung dem Werkstoff vermittelt, jedoch vergleichsweise geringe Festigkeitswerte bedingt.At high cooling end temperatures, as is the case for sample material P1, for example, a high degree of recrystallization and Coarse grain formation is given, which indeed gives high toughness and constriction of the material, but requires comparatively low strength values.
Eine Abkühlung auf niedrigere Umwandlungstemperaturen erhöht die Festigkeitswerte der Rohrwand und verringert naturgemäß dabei auch geringfügig die Einschnürung und Zähigkeit des Materials, wie dies anhand der Proben P2, P3 und P4 gezeigt ist.Cooling down to lower transformation temperatures increases the strength values of the pipe wall and, by its nature, also slightly reduces the constriction and toughness of the material, as shown by the samples P2, P3 and P4.
Mit der erfindungsgemäßen Vorrichtung sind auch gezielt Gefügestrukturen im Werkstoff einstellbar, woraus das Eigenschaftsprofil der Rohrwand resultiert. Beispielsweise konnte bei Proberohr P4 durch tiefe Umwandlungstemperatur ein hohes Maß an Umwandlung in eine untere Bainitstruktur des Gefüges erreicht werden, wodurch eine Steigerung der Zähigkeit des Werkstoffes erreichbar war.With the device according to the invention also specific microstructures in the material are adjustable, resulting in the property profile of the pipe wall results. For example, in the case of sample tube P4, owing to the low transformation temperature, a high degree of conversion into a lower bainitic structure of the microstructure could be achieved, as a result of which an increase in the toughness of the material could be achieved.
In
Die Messergebnisse der vier Quadranten Q1 bis Q4 sind Mittelwerte aus jeweils vier beabstandeten Messungen je Quadrant im Außen-, Mittel- und Innenbereich der Rohrwand.The measurement results of the four quadrants Q1 to Q4 are averages of four spaced measurements per quadrant in the outer, middle and inner regions of the tube wall.
Wie aus dem Vergleich der jeweiligen Härtewerte über den Querschnitt der Rohrwand in den Quadranten ersichtlich ist, liegen lediglich geringste Unterschiede in der Materialfestigkeit vor, wodurch die erreichbare Erzeugnisgüte durch Verwendung des erfindungsgemäßen Verfahrens und einer dergleichen Vorrichtung dargestellt ist.As can be seen from the comparison of the respective hardness values across the cross section of the tube wall in the quadrant, only slight differences in the material strength are present, whereby the achievable product quality is represented by using the method according to the invention and a similar device.
Claims (5)
- Device for the production of seamless oilfield pipes of steel having a length of more than 7 m, in particular up to 200 m, an outer diameter greater than 20 mm but less than 200 mm, and a wall thickness greater than 2.0 mm but less than 25.0 mm, with increased strength and improved toughness of the material as well as with a uniform microstructure over the entire length and over the cross-section of the pipe with a concentration of the respective alloying and accompanying elements in wt.-% of
Carbon (C) 0.03 to 0.5 Silicon (Si) 0.15 to 0.65 Manganese (Mn) 0.5 to 2.0 Phosphorus (P) max. 0.03 Sulfur (S) max. 0.03 Chromium (Cr) max. 1.5 Nickel (Ni) max. 1.0 Copper (Cu) max. 0.3 Aluminum (Al) 0.01 to 0.09 Titanium (Ti) max. 0.05 Molybdenum (Mo) max. 0.8 Vanadium (V) 0.02 to 0.2 Tin (Sn) max. 0.08 Nitrogen (N) max. 0.04 Niobium (Nb) max. 0.08 Calcium (Ca) max. 0.005 Iron (Fe) remainder - Device according to claim 1, wherein position and temperature sensors for a pipe are arranged for switching and controlling the coolant flows in the through-flow cooling zone.
- Device according to claim 1 or 2, wherein the nozzles of the distributor rings form a pyramid-shaped cooling medium flow which widens in the spraying direction.
- Device according to claim 1 to 3, wherein the nozzles of the distributor rings produce a rectangular cooling medium flow which widens in the direction of spraying, wherein the longer axis of the rectangle is directed obliquely to the pipe axis.
- Device according to claim 1 to 4, wherein the cooling medium flowing in the through-flow cooling zone may be switched in the zone as a function of the position of the pipe ends.
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HRP20170838TT HRP20170838T1 (en) | 2008-11-20 | 2017-06-01 | Method and device for producing steel pipes with special properties |
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AT0181408A AT507596B1 (en) | 2008-11-20 | 2008-11-20 | METHOD AND DEVICE FOR PRODUCING STEEL TUBES WITH SPECIAL CHARACTERISTICS |
EP09763823.3A EP2356262B1 (en) | 2008-11-20 | 2009-11-16 | Method and apparatus for producing steel pipes having particular properties |
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EP09763823.3A Division EP2356262B1 (en) | 2008-11-20 | 2009-11-16 | Method and apparatus for producing steel pipes having particular properties |
EP09763823.3A Division-Into EP2356262B1 (en) | 2008-11-20 | 2009-11-16 | Method and apparatus for producing steel pipes having particular properties |
EP09763823.3 Division | 2009-11-16 |
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EP13187253.3A Active EP2682485B1 (en) | 2008-11-20 | 2009-11-16 | Method and device for producing steel pipes with special properties |
EP09763823.3A Active EP2356262B1 (en) | 2008-11-20 | 2009-11-16 | Method and apparatus for producing steel pipes having particular properties |
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US (1) | US9394582B2 (en) |
EP (2) | EP2682485B1 (en) |
JP (1) | JP2012509398A (en) |
KR (2) | KR101694679B1 (en) |
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BR (2) | BR122017014778B1 (en) |
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Cited By (1)
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WO2020212343A1 (en) | 2019-04-18 | 2020-10-22 | Sms Group Gmbh | Cooling device for seamless steel pipes |
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CN102367560B (en) * | 2011-11-09 | 2013-06-19 | 南京钢铁股份有限公司 | High-strength corrosion-resisting straight welded pipe steel and manufacture method thereof |
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DE102020212926A1 (en) | 2020-10-14 | 2022-04-14 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein | Process for forming a semi-finished product and device for carrying out the process |
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Publication number | Priority date | Publication date | Assignee | Title |
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WO2020212343A1 (en) | 2019-04-18 | 2020-10-22 | Sms Group Gmbh | Cooling device for seamless steel pipes |
DE102019205724A1 (en) * | 2019-04-18 | 2020-10-22 | Sms Group Gmbh | Cooling device for seamless steel pipes |
Also Published As
Publication number | Publication date |
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CN102224265A (en) | 2011-10-19 |
US9394582B2 (en) | 2016-07-19 |
ZA201102056B (en) | 2011-11-30 |
EP2682485A1 (en) | 2014-01-08 |
UA98088C2 (en) | 2012-04-10 |
WO2010057235A1 (en) | 2010-05-27 |
AT507596B1 (en) | 2011-04-15 |
AT507596A1 (en) | 2010-06-15 |
KR101694679B1 (en) | 2017-01-10 |
SG10202013010SA (en) | 2021-02-25 |
KR20110095376A (en) | 2011-08-24 |
EA201100799A1 (en) | 2011-12-30 |
ES2625085T3 (en) | 2017-07-18 |
MX2011005110A (en) | 2011-05-30 |
AR075551A1 (en) | 2011-04-20 |
EA021245B1 (en) | 2015-05-29 |
ES2569103T3 (en) | 2016-05-06 |
KR20160137675A (en) | 2016-11-30 |
JP2012509398A (en) | 2012-04-19 |
EP2356262A1 (en) | 2011-08-17 |
PL2682485T3 (en) | 2017-09-29 |
BR122017014778B1 (en) | 2018-10-16 |
KR101760654B1 (en) | 2017-08-04 |
US20110272067A1 (en) | 2011-11-10 |
BRPI0921077B1 (en) | 2018-01-16 |
HRP20170838T1 (en) | 2017-08-25 |
CA2748046A1 (en) | 2010-05-27 |
SG10201500738QA (en) | 2015-03-30 |
HRP20160591T1 (en) | 2016-07-01 |
PL2356262T3 (en) | 2016-08-31 |
BRPI0921077A2 (en) | 2015-12-15 |
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EP2356262B1 (en) | 2016-03-09 |
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