EP0051511A1 - Cast roll for cold rolling, and method for its production - Google Patents
Cast roll for cold rolling, and method for its production Download PDFInfo
- Publication number
- EP0051511A1 EP0051511A1 EP81401594A EP81401594A EP0051511A1 EP 0051511 A1 EP0051511 A1 EP 0051511A1 EP 81401594 A EP81401594 A EP 81401594A EP 81401594 A EP81401594 A EP 81401594A EP 0051511 A1 EP0051511 A1 EP 0051511A1
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- European Patent Office
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- cylinder
- temperature
- metal
- chromium
- quenching
- Prior art date
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- 238000005097 cold rolling Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title claims description 4
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 26
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 22
- 239000011651 chromium Substances 0.000 claims abstract description 22
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 10
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 10
- 239000002131 composite material Substances 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 230000000171 quenching effect Effects 0.000 claims description 18
- 238000010791 quenching Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 14
- 238000011282 treatment Methods 0.000 claims description 8
- 230000007420 reactivation Effects 0.000 claims description 5
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims description 2
- 235000019589 hardness Nutrition 0.000 description 11
- 239000003570 air Substances 0.000 description 10
- 150000001247 metal acetylides Chemical class 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- -1 ferrous metals Chemical class 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000005480 shot peening Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 229910000669 Chrome steel Inorganic materials 0.000 description 1
- 241000600039 Chromis punctipinnis Species 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001349 ledeburite Inorganic materials 0.000 description 1
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical class [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
-
- 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
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
- Y10T428/12958—Next to Fe-base component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
- Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
- Y10T428/12979—Containing more than 10% nonferrous elements [e.g., high alloy, stainless]
Definitions
- the present invention relates to working rolls for cold rolling of ferrous and non-ferrous metals, which are of the composite type and obtained by casting.
- the internal tensions induced by the water quenching treatment are such that it may be necessary to resort to remelting under slag, in order to obtain a perfect crystallization.
- the chromium content of these cylinders can then reach 5 to 7%.
- the duration of rectification of these cylinders between two rolling assemblies reaches, for the same touch-up, a time at least twice that of a forged steel cylinder.
- the present invention aims to remedy these two significant drawbacks, while retaining the qualities inherent in this type of cylinder obtained by molding, the essential qualities of which are good resistance to softening and a great depth of the usable part over the diameter. .
- the present invention thus relates to a bimetallic composite cylinder for cold rolling obtained by molding, characterized in that it comprises a core metal consisting of a nodular or lamellar cast iron and a shell metal consisting of a steel having a chromium content of 8 to 16 $ and a carbon content of 0.65 to 0.95 J, the chromium / carbon ratio being between 11 to 16 and the structure of the shell metal being martensitic with a lower residual austenite content at 10%.
- the structure of the metal cylinder is obtained by a heat treatment process which consists first of all in subjecting the cylinder to an austenitization treatment at a temperature above 900 ° C. for a time of 8 at 24 hours, then after quenching in air or humid air blown stopped at a temperature of 450 to 550 ° C, the temperature is maintained at 500-550 ° C for 8 to 24 hours, then the cylinder is cooled by air quenching to room temperature and finally the cylinder is subjected to an income for reactivation of the austenite at a temperature between 400 and 450 ° C for a time of 8 to 24 hours.
- the austenitization treatment is preferably carried out at a temperature between 1000 and 1050 ° C., for a time of 8 to 24 hours.
- the cylinder is then subjected to quenching by blowing ambient air or humid air or any other equivalent known means, which is preferably stopped when the temperature of the cylinder reaches 500-520 ° C.
- the cylinder is then kept, for 8 to 24 hours, in an enclosure brought to the temperature indicated previously from 500 to 550 ° C., in order to balance the temperatures between heart and skin.
- the temperature of the cylinder is then reduced to the value of ambient temperature by a new quenching in air.
- the cylinder is finally subjected to a tempering treatment at a temperature between 400 and 450 ° C, for 8 to 24 hours.
- the composite cylinder according to the present invention comprises a layer of envelope metal having a thickness of 30 to 70 mm, which is preferably produced by centrifugation.
- This shell metal is a steel with a high chromium and carbon content, preferably having the following composition: nodular having the following composition:
- compositions and heat treatments defined above make it possible to explain the obtaining of the five properties set out above for the following reasons.
- the low-alloyed core metal therefore consists of nodular or lamellar cast iron which allows both good mechanical characteristics and good crystallization to be obtained, these two properties being essential for supporting the tensile stresses induced by the martensitic quenching of the envelope metal.
- the analysis of the envelope metal is chosen with a composition close to that of the matrix of cold working cylinders made of high chromium content cast iron previously used in the art.
- the income used on the highly alloyed steel grade according to the present invention does not lead to a transformation of the austenite into bainite, but to a reactivation of the residual austenite which is transformed, upon cooling, into martensite, exclusion of any bainite training.
- the new composite cylinder according to the present invention achieves a hardness of 700 HV (Vickers hardness) with a residual austenite content of 30 to 40%.
- composition of the new alloy according to the present invention is calculated, in particular as regards the carbon and chromium content, in order to achieve a slightly hypereutectoid composition, in order to avoid the presence of these harmful ledeburitic carbides.
- Chromium can be considered to have an equivalent carbon coefficient of 0.05.
- the best report which determines the chromium content of the matrix with the austenitization temperature, has been determined experimentally on a whole series of carbon-chromium alloys, and should preferably be between 11 and 16.
- the other elements namely Si and Mn, are found in the usual ranges for analyzes of cast steels.
- Nickel and manganese are deliberately limited to 0.7% to avoid their stabilizing effect on the residual austenite.
- Molybdenum and vanadium improve the hardening resistance of austenite and are found in the usual grades of cold working chrome steels (classes 80 and 90 of the American classification).
- New molded bimetallic composite cylinders are thus obtained which exhibit exceptional softening resistance by tempering the matrix.
- a cylinder according to the present invention has been produced using an envelope metal and a core metal having the following compositions. Analysis of the core metal
- the cylinder thus obtained is subjected to an austenitization treatment for 24 hours at 1000 ° C., then to a quenching with blown air which is stopped at a temperature of 520 ° C. The temperature of the cylinder is then maintained at a value of 520 ° C. for 20 hours, then the cylinder is cooled to ambient temperature by air quenching.
- This cylinder is then subjected to tempering at a temperature above 400 ° C., for 20 hours, which makes it possible to obtain, at the end of the treatment, a hardness of 780 HV over 50 mm on the radius.
- This cylinder was used for the cold rolling of thin sheets and confirmed the advantages stated previously in the course of the description.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Heat Treatment Of Articles (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Fluid-Damping Devices (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Laminated Bodies (AREA)
Abstract
La présente invention est relative à un cylindre composite bimétallique pour laminage à froid obtenu par moulage, caractérisé en ce qu'il comprend un métal de coeur constitué d'une fonte nodulaire ou lamellaire et un métal d'enveloppe constitué d'un acier ayant une teneur en chrome de 8 à 16 % et en carbone de 0,65 à 0,95 %, le rapport chrome/carbone étant compris entre 11 et 16 et la structure du métal d'enveloppe étant martensitique avec une teneur en austénite résiduelle inférieure à 10 %.The present invention relates to a bimetallic composite cylinder for cold rolling obtained by molding, characterized in that it comprises a core metal consisting of a nodular or lamellar cast iron and a shell metal consisting of a steel having a chromium content of 8 to 16% and carbon of 0.65 to 0.95%, the chromium / carbon ratio being between 11 and 16 and the structure of the shell metal being martensitic with a residual austenite content of less than 10%.
Description
La présente invention est relative à des cylindres de travail pour laminage à froid de métaux ferreux et non ferreux, qui sont du type composite et obtenuspar coulée.The present invention relates to working rolls for cold rolling of ferrous and non-ferrous metals, which are of the composite type and obtained by casting.
On utilisait antérieurement, pour la fabrication de tels cylindres de travail pour laminage à froid, des cylindres en acier forgé trempé à l'eau dans des nuances à carbone de 0,8 à 0,9 % et à chrome de 1,8 à 3 Ces cylindres forgés doivént avoir une parfaite santé interne pour supporter les tensions considérables induites lors de la trempe martensitique par un refroidissement brutal à l'eau.Previously used for the manufacture of such working rolls for cold rolling, forged steel rolls quenched with water in carbon grades from 0.8 to 0.9% and chromium from 1.8 to 3 These forged cylinders must have perfect internal health to withstand the considerable tensions induced during martensitic quenching by brutal cooling with water.
Dans certains cas, notamment lorsqu'on recherche de très fortes profondeurs de trempe, les tensions internes induites par le traitement de trempe à l'eau sont telles qu'il peut être nécessaire de recourir à une refusion sous laitier, afin d'obtenir une cristallisation parfaite. La teneur en chrome de ces cylindres peut alors atteindre 5 à 7 %.In some cases, especially when looking for very deep quenching depths, the internal tensions induced by the water quenching treatment are such that it may be necessary to resort to remelting under slag, in order to obtain a perfect crystallization. The chromium content of these cylinders can then reach 5 to 7%.
Une compétition s'est engagée entre forgerons pour accroître la profondeur de trempe, afin d'augmenter la partie utilisable du cylindre dans le laminoir, sans avoir à le retremper. Ainsi, de 30 mm il y a une dizaine d'années on est passé à une partie utilisable de 70 mm sur le diamètre. Cette compétition n'a néanmoins pas apporté d'amélioration sensible en ce qui concerne la résistance à l'adoucissement qui caractérise, dans une certaine mesure, la résistance aux incidents de laminage.A competition has started between blacksmiths to increase the quenching depth, in order to increase the usable part of the cylinder in the rolling mill, without having to re-soak it. Thus, from 30 mm a decade ago, we went to a usable part of 70 mm on the diameter. However, this competition did not bring any appreciable improvement as regards the resistance to softening which characterizes, to a certain extent, the resistance to rolling incidents.
Plus récemment, les fabricants de cylindres moulés ontintroduit sur le marché un nouveau type de cylindre constitué d'une couche externe en fonte à haute teneur en chrome et d'un coeur en fonte lamellaire ou nodulaire. Ces cylindres, qui se caractérisent tout à la fois par une haute résistance à l'adoucissement, et donc aux incidents, et par une forte possibilité d'utilisation sur le diamètre ( )70 mm), prennent sur le marché une place de plus en plus importante, venant ainsi concurrencer les cylindres forgés réalisés jusqu'alors.More recently, the manufacturers of molded cylinders have introduced onto the market a new type of cylinder consisting of an outer layer of cast iron with a high chromium content and a core of lamellar or nodular cast iron. These cylinders, which are characterized both by a high resistance to softening, and therefore incidents, and by a strong possibility of use on the diameter () 70 mm), take on the market an increasingly important place, thus coming to compete with the forged cylinders produced until then.
Ces cylindres en fonte à haute teneur en chrome, dont les duretés atteignent celles des cylindres en acier forgé trempé à l'eau, présentent cependant des inconvénients qui en freinent l'utilisation dans les laminoirs :
- - Ils présentent une grande difficulté de rectification.
- - They present a great difficulty of rectification.
En effet, la durée de rectification de ces cylindres entre deux montages de laminage atteint, pour une même retouche, un temps au moins double de celui d'un cylindre en acier forgé.Indeed, the duration of rectification of these cylinders between two rolling assemblies reaches, for the same touch-up, a time at least twice that of a forged steel cylinder.
- Ils sont plus difficiles à grenailler que les cylindres forgés.- They are more difficult to blast than forged cylinders.
On peut même noter qu'il est parfois impossible, notamment lorsque les cylindres en acier moulé sont très durs, d'obtenir de fortes rugosités.It may even be noted that it is sometimes impossible, particularly when the cast steel cylinders are very hard, to obtain high roughness.
La présente invention vise à remédier à ces deux inconvénients importants, tout en conservant les qualités inhérentes à ce type de cylindres obtenus par moulage, dont les qualités essentielles sont une bonne résistance à l'adoucissement et une grande profondeur de la partie utilisable sur le diamètre.The present invention aims to remedy these two significant drawbacks, while retaining the qualities inherent in this type of cylinder obtained by molding, the essential qualities of which are good resistance to softening and a great depth of the usable part over the diameter. .
La présente invention a ainsi pour objet un cylindre composite bimétallique pour laminage à froid obtenu par moulage, caractérisé en ce qu'il comprend un métal de coeur constitué d'une fonte nodulaire ou lamellaire et un métal d'enveloppe constitué d'un acier ayant une teneur en chrome de 8 à 16 $ et en carbone de 0,65 à 0,95 J, le rapport chrome/carbone étant compris entre 11 à 16 et la structure du métal d'enveloppe étant martensitique avec une teneur en austénite résiduelle inférieure à 10 %.The present invention thus relates to a bimetallic composite cylinder for cold rolling obtained by molding, characterized in that it comprises a core metal consisting of a nodular or lamellar cast iron and a shell metal consisting of a steel having a chromium content of 8 to 16 $ and a carbon content of 0.65 to 0.95 J, the chromium / carbon ratio being between 11 to 16 and the structure of the shell metal being martensitic with a lower residual austenite content at 10%.
La structure du cylindre métallique, dont la composition est définie précédemment, est obtenue par un procédé de traitement thermique qui consiste tout d'abord à soumettre le cylindre à un traitement d'austénitisation à une température supérieure à 900°C pendant un temps de 8 à 24 heures, puis après trempe à l'air ou à l'air humide soufflé arrêtée à une température de 450 à 550°C, on maintient la température à 500-550°C pendant 8 à 24 heures, on refroidit alors le cylindre par trempe à l'air jusqu'à la température ambiante et on soumet enfin le cylindre à un revenu pour réactivation de l'austénite à une température comprise entre 400 et 450°C pendant un temps de 8 à 24 heures.The structure of the metal cylinder, the composition of which is defined above, is obtained by a heat treatment process which consists first of all in subjecting the cylinder to an austenitization treatment at a temperature above 900 ° C. for a time of 8 at 24 hours, then after quenching in air or humid air blown stopped at a temperature of 450 to 550 ° C, the temperature is maintained at 500-550 ° C for 8 to 24 hours, then the cylinder is cooled by air quenching to room temperature and finally the cylinder is subjected to an income for reactivation of the austenite at a temperature between 400 and 450 ° C for a time of 8 to 24 hours.
Le traitement d'austénitisation est de préférence conduit à une température comprise entre 1000 et 1050°C, pendant un temps de 8 à 24 heures. Le cylindre est ensuite soumis à une trempe par soufflage d'air ambiant ou d'air humide ou tout autre moyen connu équivalent, qui est de préférence arrêtée lorsque la température du cylindre atteint 500-à 520°C. On maintient alors le cylindre, pendant 8 à 24 heures, dans une enceinte portée à la température indiquée'précédemment de 500 à 550°C, afin d'équilibrer les températures entre coeur et peau. On ramène alors la température du cylindre à la valeur de la température ambiante par une nouvelle trempe à l'air. Le cylindre est enfin soumis à un traitement de revenu à une température comprise entre 400 et 450°C, pendant 8 à 24 heures.The austenitization treatment is preferably carried out at a temperature between 1000 and 1050 ° C., for a time of 8 to 24 hours. The cylinder is then subjected to quenching by blowing ambient air or humid air or any other equivalent known means, which is preferably stopped when the temperature of the cylinder reaches 500-520 ° C. The cylinder is then kept, for 8 to 24 hours, in an enclosure brought to the temperature indicated previously from 500 to 550 ° C., in order to balance the temperatures between heart and skin. The temperature of the cylinder is then reduced to the value of ambient temperature by a new quenching in air. The cylinder is finally subjected to a tempering treatment at a temperature between 400 and 450 ° C, for 8 to 24 hours.
Les cylindres définis précédemment,ayant les compositions et obtenus à la suite des traitements thermiques définis ci-dessus présentent les cinq propriétés essentielles suivantes :
- 1 - Utilisation de millimètres utiles jusqu'à 100 sur le diamètre.
- 2 - Résistance à l'adoucissement à chaud exceptionnelle au moins jusqu'à 450°C.
- 3 - Haute dureté pour éviter les marques et augmenter la tenue du grenaillage.
- 4 - Facilité de rectification égale à celle des cylindres en acier forgé.
- 5 - Facilité de grenaillage avec obtention aisée de fortes rugosités.
- 1 - Use of useful millimeters up to 100 on the diameter.
- 2 - Resistance to exceptional hot softening at least up to 450 ° C.
- 3 - High hardness to avoid marks and increase the resistance of shot blasting.
- 4 - Ease of rectification equal to that of forged steel cylinders.
- 5 - Ease of peening with easy obtaining of strong roughness.
Ces cinq propriétés réunies sur un seul type de cylindre constituent un progrès notable par rapport à l'état actuel de la technique, qui ne permettait pas jusqu'à présent de concilier tous ces avantages.These five properties combined on a single type of cylinder constitute significant progress compared to the current state of the art, which until now has not made it possible to reconcile all these advantages.
Le cylindre composite selon la présente invention comporte une couche de métal d'enveloppe ayant une épaisseur de 30 à 70 mm, qui est de préférence réalisée par centrifugation.The composite cylinder according to the present invention comprises a layer of envelope metal having a thickness of 30 to 70 mm, which is preferably produced by centrifugation.
Ce métal d'enveloppe est un acier à haute teneur en chrome et en carbone, présentant de préférence la composition suivante :
Les composition et traitements thermiques définis ci-dessus permettent d'expliquer l'obtention des cinq propriétés énoncées précédemment pour les raisons suivantes.The compositions and heat treatments defined above make it possible to explain the obtaining of the five properties set out above for the following reasons.
Ceci est obtenu à l'aide d'une transformation martensitique sur toute l'épaisseur utile et, grâce à des tensions internes induites maintenues au plus bas niveau. La transformation martensitique est obtenue par refroidissement à l'air et l'effet de trempe est limité par la liaison de la couche utile du métal d'enveloppe avec un métal de coeur donnant lors du refroidissement à l'air une transformation perlitique.This is obtained using a martensitic transformation over the entire useful thickness and, thanks to induced internal tensions maintained at the lowest level. The martensitic transformation is obtained by air cooling and the quenching effect is limited by the bonding of the working layer of the shell metal with a core metal giving a pearlitic transformation during air cooling.
Le métal de coeur, peu allié, est donc constitué d'une fonte nodulaire ou lamellaire qui permet d'obtenir tout à la fois de bonnes caractéristiques mécaniques et une bonne cristallisation, ces deux propriétés étant essentielles pour supporter les contraintes de traction induites par la trempe martensitique du métal d'enveloppe.The low-alloyed core metal therefore consists of nodular or lamellar cast iron which allows both good mechanical characteristics and good crystallization to be obtained, these two properties being essential for supporting the tensile stresses induced by the martensitic quenching of the envelope metal.
L'analyse du métal d'enveloppe est choisie avec une composition voisine de celle de la matrice des cylindres de travail à froid en fonte à haute teneur en chrome antérieurement utilisée dans la technique. Les revenus utilisés sur la nuance d'acier très alliée selon la présente invention ne conduisent pas à une transformation de l'austénite en bainite, mais à une réactivation de l'austénite résiduelle qui se transforme, lors du refroi dissement, en martensite, à l'exclusion de toute formation de bainite.The analysis of the envelope metal is chosen with a composition close to that of the matrix of cold working cylinders made of high chromium content cast iron previously used in the art. The income used on the highly alloyed steel grade according to the present invention does not lead to a transformation of the austenite into bainite, but to a reactivation of the residual austenite which is transformed, upon cooling, into martensite, exclusion of any bainite training.
Pour obtenir la réactivation de l'austénite résiduelle, il est nécessaire de monter à des températures de plus de 400°C, sans pour autant que la martensite de trempe soit fortement adoucie.To obtain the reactivation of the residual austenite, it is necessary to go up to temperatures of more than 400 ° C., without the quenching martensite being strongly softened.
Après trempe à l'air, le nouveau cylindre composite selon la présente invention permet d'atteindre une dureté de 700 HV (dureté Vickers) avec une teneur en austénite résiduelle de 30 à 40 %.After air quenching, the new composite cylinder according to the present invention achieves a hardness of 700 HV (Vickers hardness) with a residual austenite content of 30 to 40%.
Après revenu, la réactivation de cette austénite permet d'obtenir des duretés de 760 à 800 HV. Ces niveaux de haute dureté sont ceux que l'on obtient habituellement en laminage à froid avec des cylindres en acier forgé traditionnel.After tempering, the reactivation of this austenite makes it possible to obtain hardnesses from 760 to 800 HV. These high hardness levels are those usually obtained in cold rolling with traditional forged steel cylinders.
Cette propriété est obtenue par l'élimination de la présence de carbures lédéburitiques du type M7C3 qui étaient antérieurement présents dans les cy- lindresmoulés selon la technique antérieure.This property is obtained by eliminating the presence of ledeburitic carbides of the M7C3 type which were previously present in the cylinders molded according to the prior art.
En effet, on peut expliquer le comportement singulier à la rectification et au grenaillage de ces cylindres selon la technique antérieure, comme étant la conséquence de la présence dans la structure de la fonte d'une forte quantité de carbures de chrome du type M7C3 dont la dureté individuelle peut atteindre 1700 HV. Ces carbures, solidement enchâssés dans une matrice martensitique également dure (700 HV), s'opposent évidemment à l'abrasion de la meule, ainsi qu'à la déformation de la grenaille, qui n'atteint pas, loin s'en faut, leur dureté (la grenaille la plus dure atteint 900 à 940 HV). L'étude du comportement en service de ces cylindres en fonte à haute teneur en chrome, selon la technique antérieure, a permis de conclure que la phase de carbures du type M7C3 ne jouait pas un rôle important au cours du laminage, mais provoquait, par contre, les inconvénients constatés lors de la rectification et du grenaillage.Indeed, we can explain the singular behavior in the rectification and shot peening of these cylinders according to the prior art, as being the consequence of the presence in the structure of the cast iron of a large quantity of chromium carbides of the M7C3 type whose individual hardness can reach 1700 HV. These carbides, firmly embedded in an equally hard martensitic matrix (700 HV), obviously oppose the abrasion of the grinding wheel, as well as the deformation of the shot, which does not reach, far from it, their hardness (the hardest shot reaches 900 to 940 HV). The study of the behavior in service of these high chromium cast iron cylinders, according to the prior art, made it possible to conclude that the phase of carbides of type M7C3 did not play an important role during rolling, but caused, by against, the drawbacks noted during grinding and shot peening.
La composition du nouvel alliage selon la présente invention est calculée, notamment en ce qui concerne la teneur en carbone et en chrome, pour atteindre une composition légèrement hypereutectoïde, afin d'éviter la présence de ces carbures lédéburitiques nuisibles.The composition of the new alloy according to the present invention is calculated, in particular as regards the carbon and chromium content, in order to achieve a slightly hypereutectoid composition, in order to avoid the presence of these harmful ledeburitic carbides.
Là, également l'absence des carbures massifs de type M7C3 très durs permet un meilleur travail de déformation plastique de la grenaille projetée, ainsi que cela a été expliqué ci-dessus.There, also the absence of massive carbides of very hard M7C3 type allows a better work of plastic deformation of the projected shot, as has been explained above.
L'étude de la composition de l'alliage d'enveloppe du cylindre selon la présente invention, dont le carbone et le chrome constituent les deux éléments principaux, permet de dégager les conclusions suivantes.The study of the composition of the cylinder shell alloy according to the present invention, of which carbon and chromium constitute the two main elements, allows the following conclusions to be drawn.
On peut considérer que le chrome présente un coefficient de carbone équivalent de 0,05.Chromium can be considered to have an equivalent carbon coefficient of 0.05.
Il apparaît ainsi que la composition légèrement hypereutectolde de l'alliage est donc équivalente, en œ qui concerne l'apparition de la lédéburite à un acier de composition 0,7 + 11 x 0,05 = 1,25 % de carbone pour la teneur maximale en chrome.It thus appears that the slightly hypereutectoidal composition of the alloy is therefore equivalent, in œ which concerns the appearance of ledeburite at a steel of composition 0.7 + 11 x 0.05 = 1.25% carbon for the maximum chromium content.
On vérifie ainsi que cette teneur est à la limite inférieure de l'apparition d'un réseau de carbures lédéburitiques.It is thus verified that this content is at the lower limit of the appearance of a network of ledeburitic carbides.
Par ailleurs, pour obtenir les propriétés de résistance à l'adoucissement à chaud, il est nécessaire d'avoir une teneur en chrome suffisante dans la matrice. Le meilleur rapport
Les autres éléments, à savoir Si et Mn, se trouvent dans les fourchettes habituelles des analyses des aciers moulés.The other elements, namely Si and Mn, are found in the usual ranges for analyzes of cast steels.
Le nickel et le manganèse sont volontairement limités à 0,7% pour éviter leur effet stabilisant sur l'austénite résiduelle.Nickel and manganese are deliberately limited to 0.7% to avoid their stabilizing effect on the residual austenite.
Le molybdène et le vanadium améliorent la résistance au revenu de l'austénite et se trouvent dans les teneurs habituelles des aciers de travail à froid au chrome (classes 80 et 90 de la classification américaine).Molybdenum and vanadium improve the hardening resistance of austenite and are found in the usual grades of cold working chrome steels (classes 80 and 90 of the American classification).
On obtient ainsi de nouveaux cylindres composites bimétalliques moulés présentant une résistance à l'adoucissement exceptionnelle par revenu de la matrice.New molded bimetallic composite cylinders are thus obtained which exhibit exceptional softening resistance by tempering the matrix.
A titre d'exemple, un cylindre selon la présente invention a été réalisé à l'aide d'un métal d'enveloppe et d'un métal de coeur ayant les compositions suivantes.
Le cylindre ainsi obtenu est soumis à un traitement d'austénitisation pendant 24 heures à 1000°C, puis à une trempe à l'air soufflé qui est arrêtée à une température de 520°C. On maintient alors la température du cylindre à une valeur de 520°C pendant 20 heures, puis on refroidit le cylindre jusqu'à la température ambiante par trempe à l'air.The cylinder thus obtained is subjected to an austenitization treatment for 24 hours at 1000 ° C., then to a quenching with blown air which is stopped at a temperature of 520 ° C. The temperature of the cylinder is then maintained at a value of 520 ° C. for 20 hours, then the cylinder is cooled to ambient temperature by air quenching.
Il présente une dureté après trempe de 692 HV et une teneur en austénite de 40,6 %.It has a hardness after quenching of 692 HV and an austenite content of 40.6%.
On soumet alors ce cylindre à un revenu à une température supérieure à 400°C, pendant 20 heures, qui permet d'obtenir à l'issue du traitement une dureté de 780 HV sur 50 mm au rayon.This cylinder is then subjected to tempering at a temperature above 400 ° C., for 20 hours, which makes it possible to obtain, at the end of the treatment, a hardness of 780 HV over 50 mm on the radius.
Ce cylindre a été utilisé pour le laminage à froid de tôles fines et a confirmé les avantages énoncés précédemment dans le cours de la description.This cylinder was used for the cold rolling of thin sheets and confirmed the advantages stated previously in the course of the description.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81401594T ATE7463T1 (en) | 1980-10-31 | 1981-10-14 | CAST ROLLER FOR COLD ROLLING AND METHOD OF PRODUCTION. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8023316A FR2493191A1 (en) | 1980-10-31 | 1980-10-31 | CASTING COLD ROLLING CYDINDER AND MANUFACTURING METHOD THEREOF |
FR8023316 | 1980-10-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0051511A1 true EP0051511A1 (en) | 1982-05-12 |
EP0051511B1 EP0051511B1 (en) | 1984-05-16 |
Family
ID=9247535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81401594A Expired EP0051511B1 (en) | 1980-10-31 | 1981-10-14 | Cast roll for cold rolling, and method for its production |
Country Status (9)
Country | Link |
---|---|
US (2) | US4436791A (en) |
EP (1) | EP0051511B1 (en) |
JP (1) | JPS57108242A (en) |
AT (1) | ATE7463T1 (en) |
BE (1) | BE890909A (en) |
DE (1) | DE3163662D1 (en) |
ES (2) | ES8503921A1 (en) |
FR (1) | FR2493191A1 (en) |
IT (1) | IT1145572B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0309587A1 (en) * | 1987-03-24 | 1989-04-05 | Hitachi Metals, Ltd. | Abrasion-resistant composite roll and process for its production |
EP0322300A1 (en) * | 1987-12-23 | 1989-06-28 | Forcast International | Bimetallic back-up roll for hot rolling |
EP0347512A1 (en) * | 1988-06-23 | 1989-12-27 | INNSE CILINDRI S.r.l. | A bimetal construction roll for reducing and finishing stands in a rolling mill train |
EP0533929A1 (en) * | 1990-06-13 | 1993-03-31 | Nippon Steel Corporation | Composite roll for use in rolling and manufacture thereof |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2469221A1 (en) * | 1979-11-13 | 1981-05-22 | Usinor | HAMMER ROLLER CYLINDER |
FR2509640A1 (en) * | 1981-07-17 | 1983-01-21 | Creusot Loire | PROCESS FOR PRODUCING A COMPOSITE METAL PART AND PRODUCTS OBTAINED |
FI853544L (en) * | 1985-09-16 | 1987-03-17 | Valmet Oy | PRESSVALS OCH FOERFARANDE FOER FRAMSTAELLNING AV DENNA. |
US4856161A (en) * | 1985-01-09 | 1989-08-15 | Valmet Oy | Press roll |
US4841611A (en) * | 1986-07-14 | 1989-06-27 | Kawasaki Steel Corporation | Work roll with dulled surface having geometrically patterned uneven dulled sections for temper rolling |
US4721153A (en) * | 1986-09-12 | 1988-01-26 | Hitachi Metals, Inc. | High-chromium compound roll |
US5536230A (en) * | 1987-12-23 | 1996-07-16 | Chavanne-Ketin | Composite working roll for hot rolling flat products |
FI80097B (en) * | 1988-04-28 | 1989-12-29 | Valmet Paper Machinery Inc | VALS I PRESSPARTIET AV EN PAPPERSMASKIN OCH FOERFARANDE FOER FRAMSTAELLNING AV DENNA. |
US5144168A (en) * | 1990-08-17 | 1992-09-01 | Texas Instruments Incorporated | Self latching input buffer |
FI88420B (en) * | 1991-03-20 | 1993-01-29 | Valmet Paper Machinery Inc | FOERFARANDE FOER FRAMSTAELLNING AV EN VALS OCH EN VALS |
DE69213608T2 (en) * | 1991-07-09 | 1997-02-06 | Hitachi Metals Ltd | Compound roll and method of making the same |
US5611143A (en) * | 1994-10-21 | 1997-03-18 | Voith Sulzer Paper Technology North America, Inc. | Process for making chilled iron rolls |
US20130122327A1 (en) * | 2011-11-11 | 2013-05-16 | Shen Sheu | Apparatus and method for imparting selected topographies to aluminum sheet metal |
CN110512055B (en) * | 2018-05-22 | 2021-03-12 | 宝山钢铁股份有限公司 | Method for treating strip steel nodulation impression defects in horizontal annealing furnace |
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FR559835A (en) * | 1921-12-16 | 1923-09-22 | Sheet metal rolling mill roll composition mode | |
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1980
- 1980-10-31 FR FR8023316A patent/FR2493191A1/en active Granted
-
1981
- 1981-10-14 EP EP81401594A patent/EP0051511B1/en not_active Expired
- 1981-10-14 AT AT81401594T patent/ATE7463T1/en not_active IP Right Cessation
- 1981-10-14 DE DE8181401594T patent/DE3163662D1/en not_active Expired
- 1981-10-29 US US06/316,487 patent/US4436791A/en not_active Expired - Lifetime
- 1981-10-29 IT IT68406/81A patent/IT1145572B/en active
- 1981-10-29 BE BE0/206381A patent/BE890909A/en not_active IP Right Cessation
- 1981-10-30 ES ES507388A patent/ES8503921A1/en not_active Expired
- 1981-10-31 JP JP56175563A patent/JPS57108242A/en active Granted
-
1982
- 1982-12-15 ES ES518633A patent/ES8401342A1/en not_active Expired
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1984
- 1984-01-05 US US06/568,431 patent/US4548653A/en not_active Expired - Lifetime
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FR559835A (en) * | 1921-12-16 | 1923-09-22 | Sheet metal rolling mill roll composition mode | |
FR637119A (en) * | 1926-07-07 | 1928-04-24 | Llanelly Foundry & Engineering | Refinements to rolls for rolling metals |
DE539816C (en) * | 1929-01-10 | 1931-12-02 | Ernst Peipers | Process for the production of castings consisting of two different materials, such as rollers |
FR1183202A (en) * | 1956-09-21 | 1959-07-03 | United States Pipe Foundry | Crushing cylinders and manufacturing process |
DE2013728A1 (en) * | 1969-03-24 | 1970-10-15 | Bethlehem Steel Corp., Bethlehem, Pa. (V.St.A.) | Compound hard cast iron mill rolls with improved chipping resistance |
FR2086561A5 (en) * | 1970-09-14 | 1971-12-31 | Marichal Ketin Cie | High chromium steel - for rolling mill roll surfaces |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0309587A1 (en) * | 1987-03-24 | 1989-04-05 | Hitachi Metals, Ltd. | Abrasion-resistant composite roll and process for its production |
EP0309587A4 (en) * | 1987-03-24 | 1989-07-24 | Hitachi Metals Ltd | Abrasion-resistant composite roll and process for its production. |
US4958422A (en) * | 1987-03-24 | 1990-09-25 | 501 Hitachi Metals, Ltd. | Wear-resistant compound roll |
EP0322300A1 (en) * | 1987-12-23 | 1989-06-28 | Forcast International | Bimetallic back-up roll for hot rolling |
WO1989005868A1 (en) * | 1987-12-23 | 1989-06-29 | Chavanne-Ketin | Bimetallic composite back-up roll for a hot rolling mill |
FR2625225A1 (en) * | 1987-12-23 | 1989-06-30 | Chavanne Ketin | BIMETALLIC COMPOSITE SUPPORT CYLINDER FOR HOT ROLL TRAIN |
EP0347512A1 (en) * | 1988-06-23 | 1989-12-27 | INNSE CILINDRI S.r.l. | A bimetal construction roll for reducing and finishing stands in a rolling mill train |
EP0533929A1 (en) * | 1990-06-13 | 1993-03-31 | Nippon Steel Corporation | Composite roll for use in rolling and manufacture thereof |
EP0533929A4 (en) * | 1990-06-13 | 1994-04-13 | Nippon Steel Corporation | |
US5419973A (en) * | 1990-06-13 | 1995-05-30 | Nippon Steel Corporation | Composite roll for rolling and process for producing the same |
Also Published As
Publication number | Publication date |
---|---|
ES507388A0 (en) | 1985-04-16 |
ES8503921A1 (en) | 1985-04-16 |
ES518633A0 (en) | 1983-12-16 |
DE3163662D1 (en) | 1984-06-20 |
EP0051511B1 (en) | 1984-05-16 |
FR2493191B1 (en) | 1984-10-26 |
US4548653A (en) | 1985-10-22 |
FR2493191A1 (en) | 1982-05-07 |
US4436791A (en) | 1984-03-13 |
IT1145572B (en) | 1986-11-05 |
ATE7463T1 (en) | 1984-06-15 |
JPS57108242A (en) | 1982-07-06 |
IT8168406A0 (en) | 1981-10-29 |
JPS6411707B2 (en) | 1989-02-27 |
BE890909A (en) | 1982-04-29 |
ES8401342A1 (en) | 1983-12-16 |
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