EP0087634B1 - Tube centrifugé en fonte à graphite sphéroidal et son procédé de fabrication - Google Patents

Tube centrifugé en fonte à graphite sphéroidal et son procédé de fabrication Download PDF

Info

Publication number
EP0087634B1
EP0087634B1 EP83101259A EP83101259A EP0087634B1 EP 0087634 B1 EP0087634 B1 EP 0087634B1 EP 83101259 A EP83101259 A EP 83101259A EP 83101259 A EP83101259 A EP 83101259A EP 0087634 B1 EP0087634 B1 EP 0087634B1
Authority
EP
European Patent Office
Prior art keywords
tube
cast iron
shell
temperature
spheroidal graphite
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
EP83101259A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0087634A1 (fr
Inventor
Rio Bellocci
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.)
Pont a Mousson SA
Original Assignee
Pont a Mousson SA
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 Pont a Mousson SA filed Critical Pont a Mousson SA
Priority to AT83101259T priority Critical patent/ATE17375T1/de
Publication of EP0087634A1 publication Critical patent/EP0087634A1/fr
Application granted granted Critical
Publication of EP0087634B1 publication Critical patent/EP0087634B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • 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
    • C21D5/00—Heat treatments of cast-iron

Definitions

  • the present invention relates to the manufacture of spheroidal graphite cast iron tubes by centrifugal casting and more particularly to a heat treatment subsequent to centrifugal casting aimed at providing the centrifuged tube with a structure allowing its lightening.
  • the tubes - that is to say the cylindrical pipes of constant thickness - made of spheroidal graphite cast iron currently have, after casting by centrifugation and heat treatment, a ferritic structure which has two advantages: on the one hand, this structure gives them good mechanical characteristics (elastic resistance and ductility); on the other hand, this ferritic structure is easily obtained by heat treatment after centrifugal casting, either in a shell provided internally with a thick coating of a pulverulent mixture of silica and bentonite suspended in water (coating called " wet-spray ”), or in a shell without such a coating.
  • wet-spray a pulverulent mixture of silica and bentonite suspended in water
  • the tube In the case of the presence of a coating of “wet-spray” on the shell, the tube, extracted from its shell and quickly introduced into an oven before it is too strongly cooled, is subjected to a so-called heat treatment. of "maintaining ferritization" at a temperature of the order of 750 ° C., for a time of the order of 20 to 25 minutes, then it is allowed to cool naturally.
  • the pipe In the absence of a “wet-spray” coating on the shell, the pipe is extracted from its casting shell and it is quickly introduced into an oven where it is subjected to graphitization annealing at a temperature of l 'order of 950 ° C for a time of the order of 20 to 25 minutes, then maintaining ferritization at a temperature of the order of 750 ° C for a time of the order of 15 to 20 minutes.
  • the Applicant has posed the problem of economically obtaining cast iron tubes poured by centrifugation which are lighter than current tubes, without appreciable loss of mechanical characteristics.
  • the Applicant sought to obtain this result by conferring on the spheroidal graphite cast iron tube, instead of the usual ferritic structure, a bainitic structure, which has a tensile strength and an elongation characteristic as well as a resilience characteristic. equal to or greater than that of the ferritic structure.
  • the ferritic structure is obtained in spheroidal graphite cast iron pipes according to patent FR 2 337 765 by centrifuging a cast iron containing, in particular by weight, 3.4% of carbon, 2.6% of silicon, 0.4% of manganese. and 0.04% magnesium, by allowing the centrifuged pipe to cool in its centrifugation mold to a temperature above 800 ° C, by transporting the centrifugation mold containing the still red pipe to a processing station.
  • the bainitic structure of spheroidal cast iron has already been sought for cast iron parts cast in a shell, in particular for mechanical components of automobiles, as shown for example by patent FR 1 056 330, because of the good mechanical characteristics conferred by such a structure.
  • the Applicant has on the contrary posed the problem of obtaining centrifuged tubes in bainitic cast iron with spheroidal graphite without the addition of expensive special elements in small quantities, such as molybdenum.
  • the subject of the invention is a centrifuged tube made of spheroidal graphite cast iron, of the type whose cast iron has the following composition by weight: this cast iron having a bainitic structure.
  • this cast iron is poured into a centrifuge shell provided with a refractory coating and cooled externally by l water, the centrifuged tube is allowed to cool in the shell to a temperature of the order of 800 to 1000 ° C to acquire an austenitic structure, then, according to the invention still in the shell, it is cooled vigorously and uniformly over its entire length by spraying water or an air and water mixture on its internal wall, up to about 250 to 450 ° C, so as to give it an austenitic or bainitic structure, then the tube is removed from the shell and placed inside an oven maintained between 250 and 450 ° C in order to create or to maintain a bainitic structure, and the tube is removed from the oven to allow it to cool in air.
  • the tube according to the invention has a substantially reduced unit weight and a significantly increased operating pressure, at the cost of a higher ovalization under the actual weight of the tube, but remaining within acceptable limits.
  • the invention is applied to the manufacture of spheroidal graphite cast iron tubes by centrifugal casting.
  • the process according to the invention consists in starting from a composition of spheroidal graphite cast iron which is as follows, in percentage by weight:
  • This composition of cast iron was modified compared to that which is usually used for the manufacture of pipe in cast iron with spheroidal graphite with ferrito-perlitic structure compared to elements Ni and Cu which did not exist and by contribution, preferably, of a notable supplement of Mn, the usual basic cast iron containing only 0.1 to 0.2% thereof.
  • the elements Ni, Cu, Mn have the property of improving the hardenability of the cast iron.
  • This spheroidal graphite cast iron composition is poured by centrifugation into a centrifuge machine shown diagrammatically in FIGS. 1 to 3.
  • This machine essentially comprises a carriage A movable in translation by means of a jack B.
  • This carriage A carries a metal shell 1 for centrifugation, of axis XX approximately horizontal, by means of rollers C of which at least one is driven by a motor M.
  • the shell 1 offers a cylindrical molding cavity of the same diameter from one end to the other in order to obtain a tube T of constant diameter and wall thickness over its entire length, therefore without interlocking.
  • Lu tube T has for example a length of 6 to 8 m for an internal diameter which can range from 60 mm to 2000 mm depending on the centrifuge machine and the shell 1 used.
  • the machine is provided, as known, with an external cooling device for the shell 1. It can be water spraying ramps distributed around the shell 1, inside a casing or a body wrapping this shell, or a water envelope flowing from one end to the other of the shell, and outside of the latter, in a closed circuit.
  • the external cooling device for the shell 1 whatever it may be, being known per se, has not been shown.
  • the invention applies preferably, but not exclusively, to the manufacture of cast iron tubes of large diameters, that is to say diameters greater than 700 mm and up to 2000 mm, there is shown next to the machine, to the right of FIG. 1, a human silhouette S to clearly show the large diameter of the shell 1 into which the tube T is to be cast.
  • this method is also applicable to the manufacture of cast iron tubes of small and medium diameters, it is that is, diameters between about 50 and 600 mm.
  • a pouring channel E provided upstream with a weir G supplied with liquid iron by a tilting pocket H.
  • the whole of the channel E and of its overflow G is mounted cantilevered on a carriage 2 movable transversely relative to the axis XX, that is to say in an end direction relative to the plane of FIG . 1.
  • the transverse carriage 2 also carries a long rigid pipe or cantilever 3 for spraying water connected to a pressure water supply, not shown.
  • the rigid pipe 3 has a length corresponding to that of the channel E, therefore of the shell 1, and is also approximately parallel to the axis XX of the shell 1. It is mounted on the transverse carriage 2 with an offset with respect to to the channel E by a transverse distance such that by transverse displacement of the carriage 2, when the channel E is inside the shell 1, the rigid pipe 3 is outside and vice versa.
  • the rigid pipe or ramp 3 is provided over its entire length with pairs of twin nozzles 4 for spraying water.
  • Nozzles 4, op nozzles placed two by two, have adjustable sections and adjusted so as to each provide an appropriate flow of water according to the thickness of the tube, which is substantially constant above all the length of the tube T.
  • the means of adjusting the sections of the nozzles nozzles 4, known per se, are not shown.
  • the shell 1 is provided, before each casting, with a refractory coating called "wet-spray", that is to say a mixture of silica powder and bentonite suspended in water.
  • This coating has for example a thickness between 0.05 and 0.8 mm.
  • the constituents of this coating mixture are in the following proportions: 500 to 3000 g of silica powder with a particle size between 40 and 100 microns and 10 to 40 g of bentonite per liter of water.
  • the spraying members of this coating known per se, have not been shown.
  • a tube T is poured by centrifugation by introducing the casting channel E into the shell and then pouring cast iron through this channel while gradually extracting it from the shell.
  • a quantity of cast iron is poured into the centrifugation shell 1 capable of giving a centrifuged tube of thickness much smaller than the usual thickness, taking into account the diameter (see below the table of numerical values).
  • the following heat treatment which consists of a stepped quenching carried out partly inside the centrifuge shell 1 and partly in a holding oven, in view to obtain and maintain a bainitic structure while avoiding the formation of perlite.
  • the shell 1 is cooled externally, and the tube T is allowed to rotate on itself, the latter cools slowly from a to b and from b to c, that is to say 1300 ° C to 11 50 ° C and from 1150 ° C to 1000 ° C almost homogeneously; around the point of the curve in solid lines in Figs. 5 and 6 and even below this point, for example up to 800 ° C., there is a slight difference in temperature between the internal wall and the external wall, less than 20 ° C. That is to say T at homogeneous temperature which is thus austenitized, that is to say with an austenitic structure at point c, without contribution of calories, but by the cooling which takes place after the pouring at l inside the shell 1.
  • the quenching or rapid cooling heat treatment is carried out inside the centrifugation shell using the spraying boom 3 and the spray nozzles 4, by spraying water or a mixture of air and water.
  • the pouring channel is retracted laterally by moving the carriage 2, the sprinkler boom 3 with nozzles 4 is completely inserted into the centrifuge shell 1, and sprinkling is carried out of the cavity of the tube T which has just been poured, while continuing to rotate the shell 1.
  • the watering rate theoretically constant all along the centrifuged tube, can be adjusted locally, if one notes local irregularities in temperature of the shell 1, although an attempt is made to make the external cooling thereof constant and uniform.
  • the tube T cools homogeneously.
  • This quenching phase is represented by the path c-d on the solid lines of Figs. 5 and 6.
  • the temperature of the tube T thus drops in a few minutes from around 10006C (or less, for example 800 ° C) to around 350 ° C.
  • the spray water is vaporized inside the rotating pipe and evacuated appropriately by means not shown.
  • the end of quenching temperature is between 250 ° C and 450 ° C.
  • the tube T has sufficient rigidity to no longer risk ovalization outside the centrifugation shell.
  • the tube also obtained by the quenching c-d a structure free of perlite. On the curves of Figs. 5 and 6, the region corresponding to the perlite is located to the right of this curve, at a certain distance from the section c-d.
  • the second phase of the heat treatment consists of maintaining the temperature to consolidate or fix the bainitic structure (maintenance of bainitization).
  • the tube T is extracted from the centrifugation shell, either by stopping the rotation of the latter, or by continuing to rotate it during the extraction, according to the extractor device available.
  • the demolished tube T is introduced into a tunnel oven 5 with heating nozzles 6, of known type, adjusted so as to maintain the pipe at a constant temperature between 250 ° C and 450 ° C, for example at 350 ° C, for 5 to 120 minutes (section of the quenching turbine of FIGS. 5 and 6), this holding time being approximately the same for all the diameters of tubes, to within 10 minutes.
  • the temperature retention time aims to obtain a homogeneous bainitic structure offering the optimal mechanical characteristics indicated below.
  • the tube T is carried in the furnace 5 by a conveyor chain 7 which can be of a type ensuring simultaneously the rotation of the tube around its axis.
  • the last phase of the heat treatment consists of rapid cooling in the open air: at the end of the bainitisation holding time, the tube T is removed from the holding oven 5 and allowed to cool in the open air according to the section ef of the curves in solid line of FIGS. 5 and 6, which causes rapid cooling, approximately in about ten minutes, approximately to room temperature.
  • the set of sections c-d-e-f of the cooling curve in solid lines represents the stepped quenching of the tube.
  • Figs. 5 and 6 illustrate the advantages of the heat treatment according to the invention, represented by the curves in solid lines, compared to the known prior treatments, represented by the curves in broken lines. We see a significant saving of time, but it is not the only advantage.
  • the conventional treatment for obtaining a bainitic structure of a statically molded part comprises a section hjk-1 simular to the section cdef of the process of the invention, but offset in the time of approximately one to two hours due to the two preliminary phases 0-g of austenitization heating, which can last from 20 minutes to 2 hours depending on the applications, and gh of maintaining austenitization at a temperature of approximately 1000 ° C, more generally between 800 and 1000 ° C.
  • the known prior treatment therefore requires a supply of calories to bring the treated parts to the austenitization temperature instead of treating the parts in the mold, immediately after their casting. It is therefore clear that the process of the invention, by saving the austenitization heating, brings a significant energy saving compared to such a treatment.
  • the heat treatment of the invention is compared with the prior technique of heat treatment of ferritization (annealing).
  • the prior heat treatment (broken line curve) has in common the section a-b-c with the solid line curve of the invention.
  • the rest of the curve c-m-n-p-q is substantially different from the curve c-d-e-f of the process of the invention.
  • the tube is left inside its centrifugation shell along the abcm curve: this corresponds to cooling at moderate speed, due to the external cooling of the centrifugation shell and the natural internal cooling of the tube centrifugal. From a to c, the austenitic structure is formed.
  • the bainitic structure makes it possible to reduce the wall thickness, and therefore the unit weight, of the tubes thanks to its good mechanical properties.
  • This appreciable reduction in thickness is also advantageous for the homogeneity of the cooling during the abcd phases, and in particular for the quenchability: it ensures the effectiveness of this quenching according to the phase cd of the heat treatment curve. , through the entire thickness of the centrifuged tube, without the need to add to the composition of the cast iron expensive metallic elements having a quenching effect, that is to say facilitating quenching, such as molybdenum .
  • the significant reduction in thickness of the centrifuged cast iron tubes brings a significant saving on the composition of the cast iron.
  • Carrying out the heat treatment according to the invention, and more particularly the phase of sprinkling or spraying water inside the cavity of the tube along the section cd, is particularly simple and economical compared to a conventional treatment of quenching in salt bath which would also require transport of the tube out of its shell while it is still hot and a manuten-. Immersion of the tube in a salt bath.
  • the method of the invention saves this ma nutention and avoid at the same time the risk of ovalization it involves.
  • the life of the centrifuge shells which are the most important and expensive components of the centrifuge equipment, must be significantly extended compared to the prior art.
  • the tube of the invention centrifuged in spheroidal graphite cast iron with a bainitic structure, despite its appreciable reduction in thickness, which provides lightening facilitating its handling, retains mechanical characteristics substantially equivalent to those of anterior ferritic tubes at the cost of greater sensitivity to ovalization, sensitivity remaining tolerable however because the tube does not undergo any handling when it is at high temperature subject to ovalization.
  • Fig. 7 represents a bainitic micrographic structure.
  • the black areas that can be seen in the upper and lower left corners are parts of graphite nodules.
  • the elongated forms resembling ferns are zones of ferrite; we can see that they cover most of the surface of the micrograph.
  • the most important white areas correspond to residual austenite; we see that they cover only a small part of the surface of the micrograph. It is the whole of this structure, recognizable only at magnification 1000 and not at magnification 100, which is called "bainitic".

Landscapes

  • 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)
  • Heat Treatment Of Articles (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Centrifugal Separators (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Continuous Casting (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Crushing And Pulverization Processes (AREA)
EP83101259A 1982-03-01 1983-02-10 Tube centrifugé en fonte à graphite sphéroidal et son procédé de fabrication Expired EP0087634B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83101259T ATE17375T1 (de) 1982-03-01 1983-02-10 Schleudergussroehren aus gusseisen mit kugelgraphit und verfahren zur herstellung derselben.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8203327 1982-03-01
FR8203327A FR2522291A1 (fr) 1982-03-01 1982-03-01 Tube centrifuge en fonte a graphite spheroidal et son procede de fabrication

Publications (2)

Publication Number Publication Date
EP0087634A1 EP0087634A1 (fr) 1983-09-07
EP0087634B1 true EP0087634B1 (fr) 1986-01-08

Family

ID=9271434

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101259A Expired EP0087634B1 (fr) 1982-03-01 1983-02-10 Tube centrifugé en fonte à graphite sphéroidal et son procédé de fabrication

Country Status (24)

Country Link
US (1) US4448610A (es)
EP (1) EP0087634B1 (es)
JP (1) JPS58161748A (es)
KR (1) KR900001096B1 (es)
AT (2) ATE17375T1 (es)
AU (1) AU553544B2 (es)
BE (1) BE896059A (es)
BR (1) BR8300976A (es)
CH (1) CH651768A5 (es)
CS (1) CS272203B2 (es)
DD (1) DD209124A5 (es)
DE (1) DE3361739D1 (es)
EG (1) EG15781A (es)
ES (1) ES8406918A1 (es)
FR (1) FR2522291A1 (es)
GB (1) GB2117000B (es)
IN (1) IN157332B (es)
IT (1) IT1158814B (es)
MX (1) MX161630A (es)
MY (1) MY8700117A (es)
PL (2) PL139262B1 (es)
RO (1) RO87318A (es)
SE (1) SE8301060L (es)
YU (1) YU43820B (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111560559A (zh) * 2020-06-19 2020-08-21 安徽合力股份有限公司合肥铸锻厂 基于等温淬火球铁的避震器毛坯及其生产工艺

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2575683B1 (fr) * 1985-01-04 1987-01-30 Pont A Mousson Procede et installation pour la fabrication continue de tuyaux en fonte a graphite spheroidal a structure controlee
EP0281249A1 (en) * 1987-03-06 1988-09-07 William H. Moore Improved method of heat treating ferrous metals
FR2697535B1 (fr) * 1992-11-02 1995-01-13 Schissler Jean Marie Procédé amélioré de traitement thermique d'alliages ferreux ou non-ferreux, et son application à l'élaboration de fonte bainitique.
DE19528291C2 (de) * 1995-08-02 1998-06-04 Ald Vacuum Techn Gmbh Verfahren und Vorrichtung zum Herstellen von Partikeln aus gerichtet erstarrten Gußkörpern
US5784851A (en) * 1996-04-23 1998-07-28 Waugh; Tom W. Centrifugally cast pole and method
DE19750144A1 (de) * 1997-11-12 1999-06-02 Krupp Polysius Ag Verfahren zur Herstellung einer Mahlwalze
KR100372011B1 (ko) * 1999-12-15 2003-02-14 사단법인 대학산업기술지원단 오스템퍼드 구상흑연주철 및 그 제조방법
JP4698098B2 (ja) * 2001-09-28 2011-06-08 株式会社クボタ 高強度高耐食性ダクタイル鋳鉄
DE10201218A1 (de) * 2002-01-14 2003-07-24 Fischer Georg Fahrzeugtech Sphärogusslegierung
FR2839727B1 (fr) * 2002-05-14 2004-06-25 Technologica Sarl Procede d'elaboration et de mise en forme de pieces en fonte a graphite spheroidal a caracteristiques mecaniques elevees
US20050189043A1 (en) * 2004-02-12 2005-09-01 Technologica Method of fabricating spheroidal graphite cast iron parts of high precision, geometrically and dimensionally, and having improved mechanical characteristics
FI118738B (fi) * 2005-01-05 2008-02-29 Metso Paper Inc Pallografiittivalurauta ja menetelmä pallografiittivaluraudan valmistamiseksi lujuutta ja sitkeyttä vaativia koneenrakennusosia varten
US8567155B2 (en) 2006-07-19 2013-10-29 Tom W Waugh Centrifugally cast pole and method
FR2918908B1 (fr) * 2007-07-16 2009-10-30 C T I F Ct Tech Des Ind De La Procede de fabrication d'une piece en fonte bainitique
US20120152413A1 (en) * 2010-12-16 2012-06-21 General Electric Company Method of producing large components from austempered ductile iron alloys
US8376024B1 (en) 2011-12-31 2013-02-19 Charles Earl Bates Foundry mold insulating coating
US8524016B2 (en) * 2012-01-03 2013-09-03 General Electric Company Method of making an austempered ductile iron article
US8833433B2 (en) 2013-01-16 2014-09-16 Charles Earl Bates Foundry mold insulating coating
FR3060607B1 (fr) * 2016-12-19 2021-09-10 Saint Gobain Pont A Mousson Objet en fonte a graphite spheroidal, element et procede de fabrication correspondants
CN108326252A (zh) * 2018-01-17 2018-07-27 嘉善超盛五金材料有限公司 一种铜套浇注方法及其浇注装置

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE148237C (es) *
US2867555A (en) * 1955-11-28 1959-01-06 Curry Thomas Wetzel Nodular cast iron and process of manufacture thereof
US2855336A (en) * 1957-02-04 1958-10-07 Thomas W Curry Nodular iron process of manufacture
US3549430A (en) * 1967-11-14 1970-12-22 Int Nickel Co Bainitic ductile iron having high strength and toughness
US3702269A (en) * 1971-01-22 1972-11-07 Int Nickel Co Ultra high strength ductile iron
US3860457A (en) * 1972-07-12 1975-01-14 Kymin Oy Kymmene Ab A ductile iron and method of making it
US3784416A (en) * 1972-09-29 1974-01-08 Canron Ltd Manufacture of white cast iron
JPS5522528B2 (es) * 1974-02-23 1980-06-17
US4157111A (en) * 1976-01-06 1979-06-05 Kubota, Ltd. Method of heat-treating ductile cast iron pipe
JPS5284118A (en) * 1976-01-06 1977-07-13 Kubota Ltd Heat treatment of ductile cast iron tube made by centrifugal casting
FR2382502A1 (fr) * 1977-03-02 1978-09-29 Pont A Mousson Procede et installation de traitement thermique de recuit de tuyaux en fonte a graphite spheroidal ou lamellaire
JPS5836664B2 (ja) * 1978-08-24 1983-08-10 株式会社クボタ 金型遠心力鋳造による耐摩耗薄肉鋳鉄スリ−ブの製造法
DE2853870A1 (de) * 1978-12-13 1980-07-03 Schmidt Gmbh Karl Gusseisen mit kugelgraphit mit austenitisch-bainitischem mischgefuege
JPS55128563A (en) * 1979-03-28 1980-10-04 Nissan Motor Co Ltd Cast iron excellent in wear and seizure resistance
JPS56127747A (en) * 1980-03-08 1981-10-06 Mazda Motor Corp Vibration isolating semispherical graphite cast iron
JPS56130453A (en) * 1980-03-14 1981-10-13 Riken Corp Tough spheroidal graphite cast iron and its heat treatment

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GIESSEREI-PRAXIS, vol. 1, 15 Janvier 1982, BERLIN (DE) K. ROHRIG: "Niedriglegierte Gusseisenwerkstoffe", pages 1-16 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111560559A (zh) * 2020-06-19 2020-08-21 安徽合力股份有限公司合肥铸锻厂 基于等温淬火球铁的避震器毛坯及其生产工艺

Also Published As

Publication number Publication date
EP0087634A1 (fr) 1983-09-07
IT1158814B (it) 1987-02-25
AU553544B2 (en) 1986-07-17
KR900001096B1 (ko) 1990-02-26
YU47283A (en) 1986-04-30
JPS58161748A (ja) 1983-09-26
ATA62883A (de) 1988-07-15
GB2117000A (en) 1983-10-05
CH651768A5 (fr) 1985-10-15
ES520165A0 (es) 1984-08-16
SE8301060L (sv) 1983-09-02
RO87318A (ro) 1985-08-31
GB8304308D0 (en) 1983-03-23
AU1194083A (en) 1983-09-08
IN157332B (es) 1986-03-01
SE8301060D0 (sv) 1983-02-25
FR2522291A1 (fr) 1983-09-02
JPS6343447B2 (es) 1988-08-30
FR2522291B1 (es) 1984-11-16
IT8367229A0 (it) 1983-02-28
BE896059A (fr) 1983-09-01
MY8700117A (en) 1987-12-31
PL240787A1 (en) 1983-11-07
CS136983A2 (en) 1989-11-14
DE3361739D1 (en) 1986-02-20
YU43820B (en) 1989-12-31
ES8406918A1 (es) 1984-08-16
ATE17375T1 (de) 1986-01-15
KR840003445A (ko) 1984-09-08
PL139262B1 (en) 1987-01-31
DD209124A5 (de) 1984-04-25
CS272203B2 (en) 1991-01-15
US4448610A (en) 1984-05-15
GB2117000B (en) 1986-03-26
MX161630A (es) 1990-11-26
EG15781A (en) 1986-12-30
PL139257B1 (en) 1987-01-31
BR8300976A (pt) 1983-11-16

Similar Documents

Publication Publication Date Title
EP0087634B1 (fr) Tube centrifugé en fonte à graphite sphéroidal et son procédé de fabrication
CA1106134A (fr) Procede de coulee de metal
CA2030727C (fr) Four a arc rotatif pour le traitement des scories d'aluminium
EP0190458B1 (fr) Procédé et installation pour la fabrication continue de tuyaux en fonte à graphite sphéroidal à structure contrôlée
WO2018114845A1 (fr) Objet en fonte à graphite sphéroïdal, élément et procédé de fabrication correspondants
WO1997042355A1 (fr) Procede et installation de metallisation de tuyaux en fonte
EP0342082B1 (fr) Procédé de réfroidissement d'un produit métallique coulé en continu
FR2556996A1 (fr) Procede d'alimentation de moules de fonderie en alliages metalliques sous pression differentielle controlee
FR2547597A1 (fr) Procede et appareil pour le traitement continu de metal en fusion
LU82874A1 (fr) Procede et installation pour la fabrication continue d'ebauches creuses en metal
EP0242347A2 (fr) Dispositif pour la coulée d'un métal en phase pâteuse
BE1000221A6 (fr) Dispositif pour la coulee d'un metal en phase pateuse.
EP1732718A2 (fr) Moule pour la coulee d'un metal liquide et procede correspondant
BE411966A (es)
BE532569A (es)
BE1004002A6 (fr) Procede et dispositif pour l'introduction d'elements de renforcement dans un bain de metal fondu.
FR2525131A1 (fr) Procede et dispositif de fabrication d'un lingot d'acier creux
EP0240482B1 (fr) Dispositif pour la coulée de l'acier
FR2462221A1 (fr) Procede de fabrication de pieces revetues et composites, notamment bimetalliques
BE436097A (es)
EP0290423A2 (fr) Dispositif de fabrication en continu d'une bande métallique mince
LU88253A1 (fr) Trou de coulée pour un four à cuve, notamment un haut fourneau
LU83399A1 (fr) Perfectionnements aux procedes de recharge des refractaires des recipients metallurgiques
FR2516939A1 (fr) Procede et installation pour le traitement de fonte hors four et fonte ainsi traitee
FR2613262A1 (fr) Combinaison d'ajutages de coulee pour couler des produits du genre de barres et tubulaires verticalement vers le haut

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE GB IT LI NL SE

17P Request for examination filed

Effective date: 19830927

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

RBV Designated contracting states (corrected)

Designated state(s): AT BE CH DE IT LI NL SE

AK Designated contracting states

Designated state(s): AT BE CH DE IT LI NL SE

REF Corresponds to:

Ref document number: 17375

Country of ref document: AT

Date of ref document: 19860115

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3361739

Country of ref document: DE

Date of ref document: 19860220

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19920114

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19920120

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19920229

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19930211

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19930228

BERE Be: lapsed

Owner name: S.A. PONT-A-MOUSSON

Effective date: 19930228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19930901

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
EUG Se: european patent has lapsed

Ref document number: 83101259.6

Effective date: 19930912

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19970122

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19970225

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980210

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980228

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980228

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20010209

Year of fee payment: 19

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020903