EP1704948B1 - Schleiffestes Rohr aus Metall und Verfahren zu seiner Herstellung - Google Patents

Schleiffestes Rohr aus Metall und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP1704948B1
EP1704948B1 EP06111618A EP06111618A EP1704948B1 EP 1704948 B1 EP1704948 B1 EP 1704948B1 EP 06111618 A EP06111618 A EP 06111618A EP 06111618 A EP06111618 A EP 06111618A EP 1704948 B1 EP1704948 B1 EP 1704948B1
Authority
EP
European Patent Office
Prior art keywords
wall
casting
metal
less
wearing part
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.)
Not-in-force
Application number
EP06111618A
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English (en)
French (fr)
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EP1704948A1 (de
Inventor
Christian Novagraaf Technologies Carbonnier
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.)
Nouvelle Des Fonderies De Treveray Ste
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Nouvelle Des Fonderies De Treveray Ste
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Publication of EP1704948A1 publication Critical patent/EP1704948A1/de
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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
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal

Definitions

  • the present invention relates to a generally tubular metal wear part, the inner surface of which has a high abrasion resistance, and to a process for the casting of such a wear part.
  • a wear part can be in particular a pipe element in a transport facility of loaded and abrasive fluids, such as for example the pipes for transporting materials in underwater dredging operations.
  • the invention is particularly directed to pipe elements such as elbows, T-joints or Y, etc. It can also be applied to the production of other parts, such as, for example, pump bodies or other elements that may be subject to strong internal abrasion.
  • the dimensions of such parts may be, for example, and in no way limiting, more than 200 mm in diameter, and in the case of dredging of about 700 to 1200 mm in diameter or even more, with wall thicknesses of several tens to a few hundred millimeters.
  • the weight of such parts can commonly exceed several tons.
  • the wear parts must only have a very good abrasion resistance, but also a mechanical strength and particularly a high impact resistance. Indeed, in the effluent pumped during dredging operations, can be found not only abrasive materials, but also of relatively large dimensions and masses.
  • the non-rectilinear parts of the pipes are particularly subject to abrasion, but also to the resulting shocks impacts of stones or similar heavy and aggressive materials.
  • To ensure good resistance to abrasion use is conventionally made of cast iron, or a hard steel with a high carbon content, of the order of 1% for example. But such hard and abrasion-resistant materials are generally brittle, and therefore do not withstand, or at least withstand, shocks or other mechanical stresses likely to be exerted on the parts considered. It is therefore also known to ensure this additional mechanical strength by surrounding an inner piece of cast iron or the like by a steel piece which may have poorer abrasion resistance characteristics, but a better mechanical strength.
  • This steel piece is also used for fixing the part on the other pipe elements, for example by carrying at its ends assembly flanges.
  • a bend the manufacture of such a composite part can be currently performed in different ways. After molding a cast iron bend, a welded steel low carbon steel shell is placed around it, this shell constituting an external protection for the cast iron bend and ensuring its holding even in case of strong mechanical stresses on the elbow or violent shocks produced inside the elbow.
  • the steel shell can be lined around the elbow, or made in two half-shells assembled together on both sides of the elbow.
  • the solution currently used is to place around the cast iron elbow, for example cast iron GX 260 CrMoNi 20.2.1 which is an alloy cast with high wear resistance, a larger steel elbow, reserving a space between them and, if this space is planned large enough, fill this space with poured concrete.
  • Such a solution poses implementation problems, by the need to manufacture the two elbows separately, then to keep them precisely in place relative to each other during casting of the concrete, to avoid possible spacing reductions that may prevent proper concrete filling, etc.
  • the concrete itself does not provide mechanical strength, and in case, following a strong wear of the internal elbow, it would be pierced, it also does not ensure good resistance to abrasion.
  • the document JP 10099960 describes a bend intended to withstand wear, comprising a wall 10 to 30 mm thick obtained by casting cast iron around a thin stainless steel bend, of the order of 1 mm, at a temperature and in such a way that a metallurgical interaction occurs between the steel and the cast iron, hardening elements of the stainless steel diffusing into the cast iron to form a surface layer of improved hardness. It is therefore rather a molded surface treatment of the cast iron to increase its hardness.
  • methods of producing "bi-metallic" metal pipes that is to say having an outer layer made of a metal having certain characteristics and an inner layer of another metal having different characteristics, are also known. adapted to the intended use.
  • centrifugal casting Such pipes are made by centrifugal casting, this method can not be used for the manufacture of parts that are not revolution, such as bends or other connecting parts covered by the invention.
  • the centrifugal casting process used for bi-material parts generates a property gradient in the thickness of the wall formed, and, in the case of the applications referred to here, would lead to a gradual reduction of the hardness of the layer. internally at the interface between the two metals from the inside. In use, the more wear would be pronounced, the less the metal would be resistant to abrasion, which is obviously not desirable.
  • the present invention aims to solve the problems mentioned above and is particularly aimed at providing a wear part optimally having high abrasion resistance inside and a high mechanical resistance to the outside.
  • the subject of the invention is a molded metal wear part, in particular by sand molding, of generally tubular shape, such as a pipe element, the internal surface of which has a resistance to high abrasion, characterized in that it comprises an inner wall with a thickness greater than or equal to 20 mm, a first abrasion-resistant metal, of hardness greater than or equal to 56 HRC, and an outer wall made of a second metal resistant to mechanical stresses and shocks, the two walls being in intimate contact, without bond or metallurgical interaction, at the interface between said walls, said intimate contact resulting from the casting of the second molten metal around the wall internal prefabricated.
  • the first metal of the inner wall is chosen from: steels and white cast iron alloyed with chromium.
  • the first metal of the inner wall is chosen from: steels and white cast iron alloyed with chromium.
  • the second metal of the outer wall is a low carbon steel, typically having a higher ultimate tensile strength Rm or equal to 500 MPa, an elongation at break A greater than or equal to 22%, and a KV resilience greater than or equal to 40 joules, ensuring good mechanical strength, in particular the shocks likely to be caused during the use of the channeling element, typically a bend. Thanks to the invention, a bi-material part is obtained which has an optimum and constant resistance to abrasion over the entire thickness of the inner wall, which will also be called “shielding" thereafter.
  • the concrete did not durably ensure proper maintenance of such damaged shielding elements, especially because of the heterogeneity of the materials, and unavoidable bad contacts that result between shielding steel or cast iron and concrete, leaving local free spaces at the interface, or the shielding is not supported and all the more sensitive to shocks.
  • the low carbon steel casing of the invention in close contact with the shield, not only provides improved mechanical strength, but also acts as a kind of vibration damper when shielding is subjected to shocks likely to generate such vibrations because of the hardness of the said shielding.
  • the softening heat treatment is intended to reduce the hardness of the shielding, to facilitate the subsequent casting of the steel of the envelope without causing deterioration of the shielding when in contact with the molten steel of the envelope, it is to say so as to limit the effects of thermal shock occurring at this time.
  • This further treatment prepares the shield for the subsequent hardening treatment, which is aimed specifically at giving the shield a greater hardness once the casing has been poured.
  • This second heat treatment of course also has a curing effect on the envelope, but which remains limited and without being really detrimental to its mechanical characteristics required.
  • the softening heat treatment is typically a pearlitization annealing treatment, the effects of which are to reduce hardness, typically to less than 340HB, and to improve ductility, to reduce the tendency for internal stress crack generation due to expansion differentials important.
  • the final curing heat treatment is typically a quenching treatment, followed by a flashback, to provide the shield with adequate hardness, typically at least 56 HRC at all points of the shield.
  • the manufacture of the elbow according to the invention is carried out according to the following process.
  • the shielding 1 is made by casting in traditional sand molding of an alloy of Z100CD 6.1 type, as specified above.
  • the cast shield is then conventionally deburred and then subjected to a softening treatment, by a pearlitisation annealing, for example with a hold at 900 ° C. for 5 hours, followed by slow cooling in the oven.
  • the aim is to give the shield, and throughout its thickness, greater ductility, which results in a drop in hardness to a value less than 340HB, or even more preferably 230 HB.
  • the hardness of the shielding is then controlled, and the treatment renewed if necessary.
  • a mold 10 is prepared, with the imprint of the envelope 2 desired.
  • the shielding prepared as above is placed in the position as shown in the figures by a core 11 placed inside the shield 1 and resting with its projecting ends 12 in the sand of the mold 10. , in known manner in molding with the use of cores.
  • supports 13 made of steel of the same nature as the steel of the casing 2 are arranged in the space 2 'existing between the cavity of the casing made in the mold and the shield 1, for example three supports below the shield and two above as shown figure 1 , to complete the centering and support of the shield before casting the envelope.
  • These supports 13 are integrated in the casing 2 during casting thereof.
  • the low-carbon steel for example of the G8Mn3 type, having a composition as indicated beforehand, is cast in the mold and around the shield so that the cast steel fills the mold by coming into good contact with the mold. shielding, but without causing it to melt.
  • the shielding is not preheated, or only slightly, for example at about 100 ° C, by simply blowing hot air to dry the mold before casting the envelope 2. It is not It is conceivable to preheat the shield more strongly, without the risk of destroying the mold, the resin of which resists only for a short time at temperatures of the order of 200 ° C. or more, which also implies that the casting is carried out rapidly.
  • a relaxation income is achieved by holding at 180 ° C for 4 hours, for example.
  • the hardness and magnetoscopic control operations are then carried out to check the internal health of the bi-material wall of the elbow and the absence of any cracks or other internal defects, and the required machining is then carried out, in particular on the flanges.
  • the invention is not limited to the examples described above of parts and method of production.
  • the invention can be applied to other parts than elbows, in particular T- or Y-branches, for example, or even other parts constituting driving elements that must internally resist abrasion.
  • the compositions of the alloys used are not limiting and should be understood to include alloys having characteristics similar to those of the alloys indicated.
  • the parameters of the process may also be adapted, according to conventional knowledge of casting and heat treatment, insofar as the parameters chosen make it possible to obtain the desired effects in accordance with the indications set out above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Articles (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)

Claims (10)

  1. Metallisches Verschleißteil, das allgemein rohrförmig ausgebildet ist, wie zum Beispiel ein Rohrleitungselement, dessen Innenfläche über eine erhöhte Abriebfestigkeit verfügt, dadurch gekennzeichnet, dass es eine Innenwand (1) mit einer Dicke größer oder gleich 20 mm aus einem ersten Metall mit einer Abriebfestigkeit größer oder gleich 56 HRC und eine Außenwand (2) aus einem stoßfesten und gegen mechanische Beanspruchung beständigen zweiten Metall aufweist, wobei sich die beiden Wände in Höhe der Grenzfläche zwischen diesen Wänden in innigem Kontakt miteinander befinden, jedoch ohne eine Verbindung noch einen metallurgischen Eingriff, wobei der innige Kontakt durch das Schmelzgießen des zweiten Metalls um die vorgefertigte Innenwand (1) entsteht.
  2. Verschleißteil nach Anspruch 1, dadurch gekennzeichnet, dass das erste Metall der Innenwand ausgewählt ist aus den Stählen und chromlegiertem Hartguss.
  3. Verschleißteil nach Anspruch 2, dadurch gekennzeichnet, dass die Innenwand eine eisenhaltige Legierung ist, umfassend nach Gewicht: C : von 0,5 bis 1,4% Si: weniger als 0,8% Mn: weniger als 1,1% Mo: von 0,8 bis 1,4% Cr: von 5 bis 8% V: weniger als 1 %
  4. Verschleißteil nach Anspruch 1, dadurch gekennzeichnet, dass die Außenwand ein kohlenstoffarmer Stahl ist.
  5. Verschleißteil nach Anspruch 4, dadurch gekennzeichnet, dass die Außenwand aus Stahl besteht, umfassend nach Gewicht: C : weniger als 2% Si: von 0,2 bis 0,8% Mn: weniger als 0,1%
  6. Verfahren zur Herstellung eines Verschleißteils gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass:
    - die Innenwand (1) gegossen wird,
    - diese Innenwand einer thermischen Enthärtungsbehandlung mit dem Zweck einer Reduzierung ihrer Festigkeit unterzogen wird,
    - dass die solchermaßen behandelte erste Wand in einer vorbereiteten Form angeordnet wird, die eine für den Mantel gewünschte Druckgussform aufweist,
    - dass das den Mantel (2) bildende Metall in die Form gegossen wird, so dass es die erste Wand einhüllt, und
    - dass die solchermaßen erzielte Gesamtheit des Teils aus zwei Materialien einer Wärmehärtungsbehandlung unterzogen wird.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die thermische Enthärtungsbehandlung eine Perlitisierungsbehandlung ist.
  8. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die abschließende Wärmehärtungsbehandlung eine Dunchhärtungsbehandlung ist.
  9. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass auf die Durchhärtungsbehandlung ein Entspannungsglühen folgt.
  10. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die erste Wand (1) durch einen Formkern (11), der im Inneren der ersten Wand angeordnet ist und an seinen Enden (12) in der Form gestützt ist, in der zum Gießen der zweiten Wand verwendeten Form (10) gehalten wird und dass die erste Wand (1) ergänzend durch Stahlstützen (13) gestützt wird, die während des Gießens der zweiten Wand (2) in dieselbe integriert werden.
EP06111618A 2005-03-24 2006-03-23 Schleiffestes Rohr aus Metall und Verfahren zu seiner Herstellung Not-in-force EP1704948B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0502917A FR2883496B1 (fr) 2005-03-24 2005-03-24 Piece d'usure metallique de forme generalement tubulaire, et procede de fabrication par coulee d'une telle piece d'usure

Publications (2)

Publication Number Publication Date
EP1704948A1 EP1704948A1 (de) 2006-09-27
EP1704948B1 true EP1704948B1 (de) 2008-04-16

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EP06111618A Not-in-force EP1704948B1 (de) 2005-03-24 2006-03-23 Schleiffestes Rohr aus Metall und Verfahren zu seiner Herstellung

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EP (1) EP1704948B1 (de)
AT (1) ATE392282T1 (de)
DE (1) DE602006000921D1 (de)
FR (1) FR2883496B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090095436A1 (en) * 2007-10-11 2009-04-16 Jean-Louis Pessin Composite Casting Method of Wear-Resistant Abrasive Fluid Handling Components
JP6201074B1 (ja) * 2017-02-27 2017-09-20 株式会社木村鋳造所 ライニング鋼管、ライニング鋼管を用いたプラント配管設備、ライニング鋼管の検査方法、ライニング鋼管の設置方法及びライニング鋼管の製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3568723A (en) * 1967-06-23 1971-03-09 Du Pont Metal-ceramic composite structures
JPS59120357A (ja) * 1982-12-28 1984-07-11 Mitsubishi Heavy Ind Ltd 耐摩耗性管の鋳造方法
JPH02133161A (ja) * 1988-11-10 1990-05-22 Kubota Ltd ステンレスライニング鋳鉄異形管の製造方法
JPH0741397B2 (ja) * 1989-05-18 1995-05-10 株式会社クボタ ステンレス被覆鋳鉄管の製造方法
JPH1099960A (ja) * 1996-09-30 1998-04-21 Hitachi Metals Ltd 複合鋳物部材及びその製造方法

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EP1704948A1 (de) 2006-09-27
ATE392282T1 (de) 2008-05-15
DE602006000921D1 (de) 2008-05-29
FR2883496B1 (fr) 2008-10-24
FR2883496A1 (fr) 2006-09-29

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