EP0077322B1 - Procédé pour la production de tubes sans bavure - Google Patents

Procédé pour la production de tubes sans bavure Download PDF

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Publication number
EP0077322B1
EP0077322B1 EP82890145A EP82890145A EP0077322B1 EP 0077322 B1 EP0077322 B1 EP 0077322B1 EP 82890145 A EP82890145 A EP 82890145A EP 82890145 A EP82890145 A EP 82890145A EP 0077322 B1 EP0077322 B1 EP 0077322B1
Authority
EP
European Patent Office
Prior art keywords
extrusion
strand
annealing
subjected
castings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82890145A
Other languages
German (de)
English (en)
Other versions
EP0077322A1 (fr
Inventor
Johann Dipl.-Ing. Stiebellehner
Peter Dipl.-Ing. Machner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vereinigte Edelstahlwerke AG
Original Assignee
Vereinigte Edelstahlwerke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vereinigte Edelstahlwerke AG filed Critical Vereinigte Edelstahlwerke AG
Publication of EP0077322A1 publication Critical patent/EP0077322A1/fr
Application granted granted Critical
Publication of EP0077322B1 publication Critical patent/EP0077322B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/085—Making tubes

Definitions

  • the invention relates to a method for producing seamless tubes from austenitic, chromium and nickel-containing steels.
  • Austenitic tubes can be manufactured using an inclined rolling process, by extrusion, continuous casting or by welding sheet metal strips.
  • the welded pipes are less expensive to manufacture, but due to the weld seam present, they have only a relatively small area of application.
  • a mandrel In the cross-rolling process, a mandrel has to be driven through a corresponding die, an economical application only being given for certain cross sections.
  • a heated steel In the production of seamless tubes by means of extrusion, a heated steel is pressed through a die, with the most severe deformations occurring.
  • the present invention has set itself the goal of providing a method for producing seamless tubes from an austenitic, chromium and nickel-containing alloy, in which the above-mentioned. Disadvantages are avoided, the advantages of continuous casting should also be combined with those of extrusion.
  • the process according to the invention for the production of seamless tubes made of austenitic chromium-nickel-containing steels with continuous casting consists essentially in that a molten metal is continuously poured into a cooled mold with a round mold cavity and partially solidified in it, drawn off and the hardened strand is cut to length is, the metal melt which has not yet solidified being electromagnetically stirred in the direction about the longitudinal axis of the strand and that the cut-to-length cast pieces, before or after any perforation which may have taken place, an annealing between 1100 and 1250 ° C, preferably between 1150 and 1200 ° C, between 30 minutes and 4 hours, preferably between 1 and 2 hours, whereupon the extrudates are allowed to cool and mechanically machined to form extrusion dies, after which the extrusion dies which are in the as-cast state and which, apart from possibly being subjected to expansion, have not undergone any hot deformation in themselves b is known to produce seamless tubes by extrusion.
  • the molten metal is moved at least in a part of the mold about the longitudinal axis of the strand, the relative movement between the strand shell and the liquid strand core preferably reaching as far as the casting level.
  • a particularly advantageous, labor-saving method is obtained if the mechanical machining of the continuous castings into an extrusion die is carried out before the annealing. With this procedure, mechanical machining is particularly easy to carry out since there is less material thickness before annealing.
  • extrusion die which is in the as-cast state, is subjected to extrusion from the incandescent heat, additional manipulation is dispensed with, and at the same time the energy for reheating does not have to be consumed.
  • a steel X10CrNiTi 18 9 was melted in a medium-frequency induction crucible furnace, tapped into a pan and taken to a continuous casting plant. From this pan, the alloy was poured into the distributor of the continuous casting plant, the metal overheating being 35 ° C. The steel was introduced from the distributor into the continuous casting mold with an inside diameter of 210 mm by means of a pouring tube, after a start-up phase of 0.3 min. was a casting speed of 1.05 m / min. reached. The casting was carried out with a covered casting mirror, i.e. under powder.
  • a three-pole rotating field device was installed in the system 220 mm below the lower edge of the 650 mm long mold. During the casting, the rotating field was supplied with a power of 72 kVA. On the basis of observations of the casting level or of the casting powder at the casting head, it was found that the liquid strand, up to the casting level in the mold, rotated around the longitudinal axis of the strand.
  • a test piece was taken from it for further investigations.
  • the strand pieces were annealed in an oven at 1180 ° C., the holding time being 1.6 hours. After the annealing treatment, a test piece was again taken from the strand.
  • the comparative investigations showed that after the continuous casting a delta ferrite content of 4.6% was present. Such high delta ferrite contents have an extremely disadvantageous effect on the deformability of the material. After annealing, the delta ferrite content in the strand was below 1%.
  • the extrusion die After machining the surface of the continuous casting, sawing and drilling, the extrusion die was heated up inductively and widened by means of a widening cap and punch. The expansion process went smoothly, i.e. the material had good thermoformability properties. Following the expansion of the billet, after intermediate heating, the extrusion process was carried out (according to the Handbook of Stainless Steels, Mr. Graw Hill Book Comp. 1977, Chapter 23). The pressed raw pipe had a good surface both inside and outside. No difficulties were found during further processing either, since the material was readily deformable.
  • the quality of the pipe was also examined by step turning tests. It was shown that there were no disruptive elongated non-metallic inclusions in the tube wall, ie that the tube had particularly high quality characteristics.
  • Example 2 The procedure was analogous to Example 1, a composite tubular mold with an integrated stirring coil being used and a steel X5CrNi 18 9 being cast.
  • the melt overheated to 25 ° C. After a start-up phase of 0.4 min. the casting speed was 1.0 m / min.
  • the rotating field power of the electromagnetic agitation was 65 kVA.
  • the annealing was carried out at 1150 ° C. and for 2.8 hours.
  • the delta ferrite content was 4.8% before the annealing and was below 1% after the annealing. No problems arose during the extrusion process and the pressed tube had a good surface both inside and outside.
  • a steel X2CrNiMo 18 10 was processed analogously, with the melt overheating at 30 ° C. and after a start-up phase of 0.3 min. a casting speed of 1.1 m / min. complied with.
  • the rotating field power of the electromagnetic stirring device was 72kVA.
  • the strand-strand surface temperature of 715 ° C is placed in an oven and annealed at 1200 ° C etc. Subjected for 1.4 hours.
  • the delta ferrite content was below 1%.
  • the extruded casting then machined mechanically to form an extrusion die was subjected to the extrusion process according to Example 1, the tube obtained having no surface defects and the extrusion process being uneventful.
  • a steel K10CrNiNb 18 9 was processed analogously to Example 1, the mechanical machining of the continuous casting being carried out to form an extrusion die before annealing. Machining was easier than in the previous examples because there were short breaking chips.
  • the continuous cast billet was then heated to 1190 ° C. in a rotary hearth furnace and left at this temperature for 2 hours.
  • the extrusion process was carried out directly from the annealing heat, whereby no difficulties could be determined during processing by the extrusion and the raw tube had a good surface both inside and outside.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Continuous Casting (AREA)

Claims (5)

1 ) Procédé de fabrication de tubes sans soudure en partant d'aciers austénitiques contenant du chrome et du nickel, avec coulée continue, dans lequel on coule de façon continue un bain métallique dans une lingotière refroidie présentant une cavité de moulage ronde et on le laisse se solidifier partiellement dans celle-ci, on le retire et on tronçonne la coulée durcie à coeur tandis qu'on agite électromagnétiquement autour de l'axe longitudinal de la coulée le bain métallique qui n'est pas encore solidifié et on soumet les morceaux de coulée continue tronçonnés, avant ou après une perforation effectuée le cas échéant, à un recuit entre 1100 et 1250°C, de préférence entre 1150 et 1200°C, pendant30 mn à 4 h, de préférence pendant 1 à 2 h, après quoi on laisse refroidir les morceaux de coulée continue et on les transforme mécaniquement, avec enlèvement de copeaux, en loupes de filage à la presse, après quoi, en partant des loupes de filage à la presse qui se trouvent à l'état coule et qui n'ont pas encore été soumises à une déformation à chaud, à part éventuellement un élargissement, on fabrique des tubes sans soudure de manière en soi connue, par filage à la presse.
2) Procédé selon la revendication 1, dans lequel on déplace le bain métallique autour de l'axe longitudinal de la coulée, au moins dans une partie de la lingotière, le mouvement relatif entre la croûte de la coulée et le coeur liquide de la coulée arrivant de préférence jusqu'au niveau de coulée.
3) Procédé selon l'une des revendications 1 et 2, dans lequel on soumet les morceaux de coulée continue au recuit, à une température minimale d'environ 700°C à leur surface, immédiatement après la coulée continue.
4) Procédé selon l'une des revendications 1 et 2, dans lequel on effectue avant le recuit l'usinage mécanique des morceaux de coulée continue, avec enlèvement de copeaux, en une loupe de filage à la presse.
5) Procédé selon la revendication 4, dans lequel on soumet au filage à la presse la loupe de filage à la presse qui se trouve à l'état coulé par suite de la chaleur de recuit.
EP82890145A 1981-10-08 1982-10-07 Procédé pour la production de tubes sans bavure Expired EP0077322B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0431381A AT383065B (de) 1981-10-08 1981-10-08 Verfahren zur herstellung von nahtlosen rohren
AT4313/81 1981-10-08

Publications (2)

Publication Number Publication Date
EP0077322A1 EP0077322A1 (fr) 1983-04-20
EP0077322B1 true EP0077322B1 (fr) 1986-04-09

Family

ID=3562374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82890145A Expired EP0077322B1 (fr) 1981-10-08 1982-10-07 Procédé pour la production de tubes sans bavure

Country Status (6)

Country Link
US (1) US4432811A (fr)
EP (1) EP0077322B1 (fr)
JP (1) JPS5870955A (fr)
AT (1) AT383065B (fr)
DE (1) DE3270460D1 (fr)
ES (1) ES8308243A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6191326A (ja) * 1984-10-12 1986-05-09 Nippon Steel Corp 高温用オ−ステナイト系ステンレス鋼管の製造方法
JPS6191328A (ja) * 1984-10-12 1986-05-09 Nippon Steel Corp 高温用オ−ステナイト系ステンレス鋼管の製造方法
US4802436A (en) * 1987-07-21 1989-02-07 Williams Gold Refining Company Continuous casting furnace and die system of modular design
GB2251569A (en) * 1990-11-06 1992-07-15 Alform Alloys Ltd Continuous extrusion of pre-heated billets
US5605587A (en) * 1995-04-07 1997-02-25 Hydrodynamics Corporation Apparatus for magnetic conditioning of liquids and methods of making same
US20070093006A1 (en) * 2005-10-24 2007-04-26 Basol Bulent M Technique For Preparing Precursor Films And Compound Layers For Thin Film Solar Cell Fabrication And Apparatus Corresponding Thereto
MY154390A (en) * 2006-12-14 2015-06-15 Cta Technology Proprietary Ltd Manufacturing method for a multi-channel copper tube, and manufacturing apparatus for the tube
CN105710619B (zh) * 2015-11-06 2017-11-07 华南理工大学 一种摆线齿轮低成本高效加工方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA528354A (fr) * 1956-07-31 Junghans Siegfried Methode et appareils pour la coulee de metaux
US3523833A (en) * 1967-03-14 1970-08-11 Boehler & Co Ag Geb Method of improving the properties of alloy steel castings
JPS5326731A (en) * 1976-08-26 1978-03-13 Fuji Kogyosho Kk Method of manufacturing metal pipe
JPS5371620A (en) * 1976-12-08 1978-06-26 Kobe Steel Ltd Method and equipment for continuously solution heat treating stainlesssteel pipe
LU78744A1 (de) * 1977-12-21 1979-07-20 Arbed Verfahren und vorrichtung zur herstellung von hohlstraengen
FR2414969A1 (fr) * 1978-01-23 1979-08-17 Creusot Loire Procede de coulee continue de metaux, notamment d'acier, dispositif pour la mise en oeuvre et ebauche metallique creuse obtenue par ce procede
LU79444A1 (fr) * 1978-04-14 1979-11-07 Arbed Procede et installation pour la fabrication d'ebauches creuses
JPS55100928A (en) * 1979-01-24 1980-08-01 Hitachi Ltd Heat treatment for austenite stainless steel
JPS5844127B2 (ja) * 1979-06-05 1983-10-01 株式会社クボタ 端部の直管部組織を微細化したステンレス鋳鋼製エルボ類の製造法

Also Published As

Publication number Publication date
US4432811A (en) 1984-02-21
EP0077322A1 (fr) 1983-04-20
ES515529A0 (es) 1983-08-16
JPS5870955A (ja) 1983-04-27
AT383065B (de) 1987-05-11
ES8308243A1 (es) 1983-08-16
DE3270460D1 (en) 1986-05-15
ATA431381A (de) 1986-10-15

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