EP2039786B1 - Procédé de refroidissement de tuyau d'acier à paroi mince - Google Patents

Procédé de refroidissement de tuyau d'acier à paroi mince Download PDF

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Publication number
EP2039786B1
EP2039786B1 EP07744417.2A EP07744417A EP2039786B1 EP 2039786 B1 EP2039786 B1 EP 2039786B1 EP 07744417 A EP07744417 A EP 07744417A EP 2039786 B1 EP2039786 B1 EP 2039786B1
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EP
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Prior art keywords
steel pipe
cooling
cooling water
flow rate
quenching
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EP07744417.2A
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German (de)
English (en)
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EP2039786A4 (fr
EP2039786A1 (fr
Inventor
Hajime Oosako
Junji Nakata
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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    • 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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray 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
    • 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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B2045/0227—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for tubes

Definitions

  • This invention relates to a method of cooling a steel pipe capable of effectively suppressing bending of steel pipes which can easily occur particularly when quenching thin-walled steel pipes, thereby making it possible to manufacture steel pipes having mechanical properties of increased uniformity.
  • Bending of steel pipes sometimes occurs at the time of quenching.
  • "bending" of a steel pipe means curvature in the axial direction of the steel pipe.
  • quenching-induced bending bending which is observed at the time of quenching
  • Quenching-induced bending is caused by factors such as uneven cooling.
  • the ratio (t/D) of the wall thickness (t) to the outer diameter (D) has a low value such as at most 0.07
  • a large amount of quenching-induced bending which is considered a defect in quality, can easily occur.
  • JP H02-7372 B (1990 ) discloses a heat treatment method which, during quenching of a metal pipe, suppresses quenching-induced bending by performing slow cooling in the initial stage of cooling the outer surface of the pipe so as to reduce the temperature difference over the entire surface of the pipe followed by usual rapid cooling.
  • JP S61-4896 B (1986 ) a cooling method is disclosed in which a pipe is cooled by spraying water into the interior of the pipe from one end thereof while water sprayed from nozzles is allowed to impinge on the outer surface of the pipe over substantially the entire length thereof.
  • the amount of water sprayed on the outer surface of the pipe is increased, or the timing of the start of outer surface cooling is made earlier, or the completion of outer surface cooling is delayed, whereby the entire pipe is uniformly cooled in a short period.
  • JPH11269548 discloses a method to restrain unevenness in the outer diameter of a long tube developed near the end part of the steel tube after quenching by controlling the timings to start inner surface cooling and outer surface cooling and preceding the outer surface cooling to the inner surface cooling.
  • the cooling time is necessarily elongated and the manufacturing efficiency of a pipe is decreased.
  • This invention provides a method of cooling a steel pipe which can suppress quenching-induced bending during quenching of thin-walled steel pipes having a t/D ratio of at most 0.07 and which can solve the problems of the above-described prior art.
  • the present invention is a method of cooling a steel pipe in which the inner surface and outer surface of a horizontally-disposed steel pipe are cooled while rotating the steel pipe in its circumferential direction, characterized in that the ratio of the wall thickness to the outer diameter of the steel pipe is preferably at most 0.07 and more preferably at most 0.06, cooling of the inner surface of the steel pipe is carried out by spraying cooling water inside the steel pipe and cooling of the outer surface of the steel pipe is carried out by making cooling water flow downwards in a planar shape in the axial direction onto the outer surface of a steel pipe from above at two locations approximately equally spaced from the uppermost portion of the steel pipe on both sides thereof, the flow rate of cooling water which flows downwards at a location on the upstream side in the direction of rotation of the steel pipe is equal to or greater than the flow rate of cooling water flowing downwards at a location on the downstream side in the rotational direction, and cooling of the inner surface of the steel pipe is commenced at least 7 seconds prior to cooling of the outer surface of the steel pipe.
  • a method of cooling a steel pipe according to the present invention can effectively suppress quenching-induced bending of steel pipes without a decrease in the manufacturing efficiency of steel pipes even when quenching thin-walled steel pipes for which t/D is at most 0.07.
  • the uniformity of cooling in both the circumferential and axial directions of a steel pipe is improved, leading to improvement in the uniformity of quenching and accordingly uniformity of the mechanical properties of a steel pipe.
  • the steel pipe has improved toughness.
  • Figure 1 is a vertical cross-sectional view schematically showing the structure of a cooling apparatus for carrying out a method of cooling a steel pipe according to this embodiment.
  • a cooling apparatus 1 includes a pair of rotating rollers 3, 3 which support a horizontally-disposed steel pipe 2 and rotate it in its circumferential direction.
  • the cooling apparatus 1 additionally includes an inner surface cooling nozzle (not shown) which is disposed near one end of the steel pipe 2 and which is designed to spray cooling water into the interior of the steel pipe 2, and an outer surface cooling nozzle 7 which is installed above the steel pipe 2.
  • the inner surface cooling nozzle may be a conventional spraying nozzle.
  • the outer surface cooling nozzle 7 has slit-shaped discharge ports 6a and 6b for allowing streams of cooling water 5a and 5b which have a planar shape in the pipe axial direction to flow downwards from above at two locations 4a and 4b which are approximately equally spaced from the uppermost (top) portion of the outer peripheral surface of the steel pipe 2 on both sides thereof (namely, at two locations which are approximately symmetric with respect to the uppermost portion).
  • the discharge ports 6a and 6b preferably have a length extending over substantially the entire length of the steel pipe 2.
  • the cooling water for cooling the outer surface preferably flows naturally downwards in a laminar flow from the discharge ports 6a and 6b of the nozzle 7, but it is also possible to apply pressure to the cooling water.
  • a steel pipe 2 to which a cooling method according to this embodiment can be advantageously applied is a thin-walled steel pipe having a ratio t/D of the wall thickness t with respect to the outer diameter D of at most 0.07 with which a significant amount of quenching-induced bending which becomes a problem with respect to quality can easily occur.
  • This cooling method can be applied particularly suitably to cooling of the inner and outer surfaces of line pipe made from low carbon steel which is of low strength and easily bends or line pipe of a grade not higher than API X60 (having a composition in mass percent of, for example, (a) C: 0.06%, Si: 0.26%, Mn: 1.24%, P: 0.013%, S: 0.001%, Cr: 0.16%, V: 0.06%, a remainder of Fe and impurities, with Ceq: 0.311%, or (b) C: 0.06%, Si: 0.40%, Mn: 1.60%, P: 0.020%, S: 0.003%, Cu: 0.30%, Ni: 0.50%, Cr: 0.28%, Mo: 0.23%, V: 0.08%, a remainder of Fe and impurities, with Ceq: 0.498%). Even when this cooling method is applied to a long steel pipe 2 with a length of at least 20 meters, it can effectively suppress the occurrence of quenching-induced bending.
  • cooling a steel pipe 2 with the cooling apparatus 1 When cooling a steel pipe 2 with the cooling apparatus 1 according to this embodiment, first, the steel pipe 2 is rotated in its circumferential direction by rotating the rotating rollers 3, 3 in the direction of the arrows. Then, cooling of the inner surface of the steel pipe 2 is commenced by spraying cooling water from the unillustrated inner surface cooling nozzle into the interior of the steel pipe from one end thereof. The sprayed cooling water is discharged from the other end of the steel pipe 2. Cooling of the outer surface of the steel pipe 2 is then commenced by making cooling water 5a and 5b from the discharge ports 6a and 6b of the outer surface cooling nozzle 7 flow downwards towards the outer peripheral surface of the steel pipe 2. The cooling water may if necessary contain an additive such as a corrosion inhibitor as is well known in the art.
  • the rotational speed of the steel pipe 2 is preferably at least 30 rpm and at most 80 rpm. If the rotational speed of the steel pipe 2 is less than 30 rpm, the condition of the steel pipe 2 after quenching can easily vary in the circumferential direction thereof. On the other hand, if the rotational speed of the steel pipe 2 exceeds 80 rpm, the necessary equipment becomes large in size and complicated and equipment costs increase.
  • the rate at which cooling water is sprayed into the interior of the steel pipe 2 from the inner surface cooling nozzle is preferably at least 2,000 m 3 per hour and at most 6,500 m 3 per hour. If the flow rate of cooling water sprayed into the steel pipe 2 is less than 2,000 m 3 per hour, the cooling ability is inadequate, whereas if it exceeds 6,500 m 3 per hour, the necessary equipment becomes large in size and complicated and equipment costs increase.
  • cooling of the inner surface of the steel pipe 2 begins at least 7 seconds before cooling of the outer surface of the steel pipe 2 for the following reasons.
  • Figure 2 are graphs showing the results of numerical calculation of the surface temperature, the yield strength YS, and the axial stress ⁇ z of the steel pipe 2 when the inner surface and the outer surface of the steel pipe 2 were cooled.
  • of the axial stress produced by thermal expansion and contraction of the steel pipe 2 in the initial stage after the start of cooling i.e., in the stage in which the surface temperature of the steel pipe 2 is 550° C or higher (the axial stress in the region indicated by symbol A in the graph of Figure 2(a) ), or that of the axial stress produced after the surface temperature of the steel pipe 2 decreases to lower than 550° C (the axial stress in the region shown by symbol B in the graph of Figure 2(a) ) and including the stress caused by bainite transformation or martensite transformation or the like is sometimes larger than the absolute value
  • cooling is carried out not only on the inner surface but also on the outer surface of a steel pipe 2.
  • it is effective to begin cooling of the inner surface of the steel pipe 2 before cooling of the outer surface. Specifically, by making the advance time at least 7 seconds, the relationship
  • the advance time of inner surface cooling exceeds 30 seconds, a long time is required for cooling of a steel pipe 2 and operating efficiency decreases. Therefore, the advance time is preferably at most 30 seconds.
  • a certain amount of the cooling water 5b which flows down at position 4b on the downstream side in the direction of rotation, i.e., of the cooling water which runs down from discharge port 6b flows backwards against the direction of rotation of the steel pipe 2, but almost all of it flows to the downward side and then drops immediately after it flows down.
  • the contribution to cooling of the outer surface of the steel pipe 2 is greater for cooling water 5a than for cooling water 5b.
  • the flow rate of cooling water which flows down at location 4a on the upstream side in the rotational direction of the steel pipe 2 is made equal to or larger than the flow rate of cooling water 5b which flows down at location 4b on the downstream side in the rotational direction of the steel pipe 2.
  • the flow rates of cooling water 5a and 5b can be set by adjusting the width of the slits of the discharge ports 6a and 6b, respectively.
  • the amount of cooling water which flows in the rotational direction along the outer surface of the steel pipe 2 can be increased as needed, and the water film which accumulates between positions 4a and 4b on the outer surface of the steel pipe where cooling water streams 5a and 5b, respectively, flow down can be made a suitable thickness, thereby making it possible to further increase the cooling efficiency of the outer surface of the steel pipe 2.
  • the ratio of the flow rate of cooling water 5b which flows down at location 4b on the downstream side in the rotational direction of the steel pipe 2 with respect to the flow rate of cooling water 5a which flows down at location 4a on the upstream side in the rotational direction of the steel pipe 2 is in the range of 1 : 0.6 and preferably in the range of 1 : 0.8.
  • this ratio somewhat smaller than 1, the amount of bending can be decreased compared to when the ratio is 1 (namely, when the flow rates of cooling water streams 5a and 5b are the same).
  • this ratio is too small, the amounts of cooling water on both sides of the outer peripheral surface of the steel pipe become significantly unequal and the amount of bending ends up increasing.
  • the angle ⁇ between positions 4a and 4b where the two streams of cooling water 5a and 5b impact the outer peripheral surface of the steel pipe 2 as measured from the center of the steel pipe 2 is preferably at least 12° and at most 95°. If this angle ⁇ is less than 12°, the region formed by the water film on the surface of the steel pipe 2 (the region between positions 4a and 4b) becomes extremely narrow. If this angle exceeds 95°, except for the case in which the outer diameter of the steel pipe 2 is extremely large, it is difficult to supply a sufficient amount of water for cooling between positions 4a and 4b of cooling water 5a and 5b on the outer surface of the steel pipe, and cooling sometimes becomes insufficient particularly at the uppermost portion of the steel pipe 2.
  • a third discharge port for cooling water which flows downwards in a planar shape may be installed preferably in a position immediately above the uppermost portion of the steel pipe 2.
  • the flow rate of cooling water which flows down from this third discharge port is preferably smaller than the flow rates of cooling water from the discharge ports 6a and 6b on both sides.
  • the cooling apparatus becomes complicated, it is possible to have two rows of third streams of cooling water in a planar shape.
  • two pairs of two rows of discharge ports namely, an inner pair and an outer pair
  • the flow rate of cooling water which flows down in a position on the upstream side in the rotational direction of the steel pipe 2 is preferably set to be equal to or greater than the flow rate of cooling water which flows down at a position on the downstream side in the rotational direction of the steel pipe 2.
  • the amount of quenching-induced bending which develops when quenching a thin-walled steel pipe P for which the ratio t/D is at most 0.07 can be made such that the maximum overall bending in a lot of pipes is effectively suppressed without a decrease in the manufacturing efficiency of steel pipes.
  • the quenched steel pipes have improved toughness.
  • cooling of the outer surface can be carried out under the same conditions over the entire length of the steel pipe without varying the starting time and the ending time in the axial direction of the steel pipe, so complexity of the structure of equipment and of control can be avoided.
  • the timing of start of cooling of the outer surface is delayed relative to cooling of the inner surface over the entire length of the steel pipe.
  • cooling was carried out on API X60 grade steel pipes 2 (in mass %, C: 0.06%, Si: 0.26%, Mn: 1.24%, P: 0.013%, S: 0.001%, Cr: 0.16%, V: 0.06%, a remainder of Fe and impurities, and Ceq: 0.311%) having the outer diameter D, wall thickness t, ratio t/D, and length shown in Table 1 while rotating it at a rotational speed of 60 rpm with the inner surface flow rate (the flow rate of cooling water for cooling the inner surface), the total flow rate on the outer surface (the total flow rate of cooling water for cooling the outer surface), the inner surface advance time (the time interval from the start of inner surface cooling to the start of outer surface cooling), the separation between the streams of outer surface cooling water (the distance in the circumferential direction between 4a and 4b in Figure 1 ), and the angle ⁇ having the values shown in Table 1.
  • the heating temperature of the steel pipe 2 prior to the start of cooling was 920° C
  • cooling of the steel pipe 2 was carried out using one stream of cooling water which flowed downwards in a planar shape on the outer surface of the steel pipe 2.
  • the discharge port for cooling water was disposed immediately above the uppermost portion of the steel pipe 2.
  • the amount of quenching-induced bending which was produced in the steel pipe 2 after the completion of cooling (in unit of mm/10 m; determined by measuring the amount of bending (mm) with a thread stretched over the overall length of a pipe for the pipe having the largest amount of bending in a lot of pipes undergoing the same heat treatment, and converting this value into the amount of bending per 10 meters) and the maximum fracture appearance transition temperature vTs (the maximum value measured at 4 locations in the circumferential direction of the steel pipe) in a Charpy impact test were determined.
  • Bending amounts of at most 10 mm are indicated by DOUBLE CIRCLE (O)
  • CIRCLE ( ⁇ ) bending amounts of greater than 10 mm and at most 20 mm are indicated by CIRCLE ( ⁇ )
  • TRIANGLE ( ⁇ ) bending amounts of greater than 20 mm and at most 30 mm are indicated by X.
  • a value of -40° C or below is indicated by CIRCLE
  • a value of greater than -40° C and at most 0° C is indicated by TRIANGLE
  • a value exceeding 0° C is indicated by X.
  • the overall evaluation was whichever of the above two evaluations was the worst, with the highest evaluation being CIRCLE.
  • Runs Nos. 5 - 7, 10, 11, 14, and 15 in Table 1 are examples of carrying out cooling by the method according to the present invention (namely, there were two streams of outer surface cooling water, and inner surface cooling was carried out at least 7 seconds in advance).
  • the amount of bending was CIRCLE or DOUBLE CIRCLE, and even with a thin-walled steel pipe having a t/D ratio of at most 0.07 (i.e., 0.031 to 0.058), quenching-induced bending could be effectively suppressed without decreasing the manufacturing efficiency of a steel pipe.
  • the Charpy maximum fracture appearance transition temperature (maximum vTs) was -40° C or below, so the toughness was good.
  • Runs Nos. 6 and 7 had the same cooling conditions as each other except that the distribution of the flow rate of the two streams of outer surface cooling water was different. Whereas the amount of quenching-induced bending was 10 mm for Run No. 6 in which the flow rates of the two streams of outer surface cooling water were the same, for Run No. 7 in which the flow rate for the stream on the upstream side in the rotational direction of the steel pipe was made larger than the flow rate for the stream on the downstream side, the amount of quenching-induced bending was further decreased to 6 mm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (3)

  1. Procédé pour refroidir un tuyau en acier (2), dans lequel la surface interne et la surface externe d'un tuyau en acier (2) disposé horizontalement sont refroidies alors que le tuyau en acier (2) tourne dans sa direction circonférentielle, caractérisé en ce :
    le refroidissement de la surface interne du tuyau en acier (2) est réalisé en pulvérisant de l'eau de refroidissement à l'intérieur du tuyau en acier,
    le refroidissement de la surface externe du tuyau en acier (2) est réalisé en produisant l'écoulement descendant de l'eau de refroidissement (5a, 5b) dans une forme planaire le long de la direction axiale sur la surface externe du tuyau en acier (2) de dessus à deux emplacements approximativement à égales distances de la partie la plus haute du tuyau en acier (2) des deux côtés de la partie la plus haute, dans lequel le débit de l'eau de refroidissement (5a) qui s'écoule vers le bas à un emplacement du côté en amont dans la direction de rotation du tuyau en acier (2) est égal ou supérieur au débit d'eau de refroidissement (5b) qui s'écoule vers le bas à un emplacement du côté en aval dans la direction de rotation, dans lequel le rapport du débit d'eau de refroidissement (5b) qui s'écoule du côté en aval dans la direction de rotation du tuyau en acier (2) par rapport au débit de l'eau de refroidissement (5a) qui s'écoule vers le bas du côté en amont dans la direction de rotation du tuyau en acier (2) est dans la plage de 1 - 0,6, et
    le refroidissement de la surface interne du tuyau en acier (2) commence 30 secondes avant le refroidissement de la surface externe du tuyau en acier (2).
  2. Procédé pour refroidir un tuyau en acier selon la revendication 1, dans lequel le rapport de l'épaisseur de paroi sur le diamètre externe du tuyau en acier (2) est au maximum de 0,07.
  3. Procédé pour refroidir un tuyau en acier selon l'une quelconque des revendications 1 à 2, dans lequel le rapport du débit d'eau de refroidissement (5b) qui s'écoule vers le bas du côté en aval dans la direction de rotation du tuyau en acier (2) par rapport au débit d'eau de refroidissement (5a) qui s'écoule vers le bas du côté en amont dans la direction de rotation du tuyau en acier (2) est dans la plage de 1 - 0,8.
EP07744417.2A 2006-05-30 2007-05-30 Procédé de refroidissement de tuyau d'acier à paroi mince Active EP2039786B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006150248A JP2007321178A (ja) 2006-05-30 2006-05-30 鋼管の冷却方法
PCT/JP2007/061004 WO2007139158A1 (fr) 2006-05-30 2007-05-30 procÉdÉ de refroidissement de tuyau d'acier

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EP2039786A1 EP2039786A1 (fr) 2009-03-25
EP2039786A4 EP2039786A4 (fr) 2010-04-07
EP2039786B1 true EP2039786B1 (fr) 2017-06-21

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US (1) US20090183805A1 (fr)
EP (1) EP2039786B1 (fr)
JP (1) JP2007321178A (fr)
CN (1) CN101490286A (fr)
MX (1) MX2008015180A (fr)
WO (1) WO2007139158A1 (fr)

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JP5071537B2 (ja) * 2010-09-02 2012-11-14 住友金属工業株式会社 鋼管の焼入れ方法およびそれを用いた鋼管の製造方法
CN101962707B (zh) * 2010-10-28 2012-05-30 攀钢集团钢铁钒钛股份有限公司 生产42CrMo钢无缝钢管的方法
CN103146901B (zh) * 2013-03-27 2015-11-18 湖北新冶钢有限公司 钢管水淬方法
JP6436473B2 (ja) * 2014-06-30 2018-12-12 トピー工業株式会社 熱処理システムおよび熱処理方法
CN104775079A (zh) * 2015-03-24 2015-07-15 天津市精成伟业机器制造有限公司 一种海洋用高可焊、大口径、厚壁高钢级无缝钢管及其制备工艺
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CN111229845B (zh) * 2020-01-15 2020-12-29 燕山大学 一种大型筒节环形冷却装置

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JP2007321178A (ja) 2007-12-13
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US20090183805A1 (en) 2009-07-23
WO2007139158A1 (fr) 2007-12-06
EP2039786A1 (fr) 2009-03-25
CN101490286A (zh) 2009-07-22

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