EP0209437A1 - Lightly alloyed, forged steel cylinder for cold rolling - Google Patents
Lightly alloyed, forged steel cylinder for cold rolling Download PDFInfo
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- EP0209437A1 EP0209437A1 EP86401434A EP86401434A EP0209437A1 EP 0209437 A1 EP0209437 A1 EP 0209437A1 EP 86401434 A EP86401434 A EP 86401434A EP 86401434 A EP86401434 A EP 86401434A EP 0209437 A1 EP0209437 A1 EP 0209437A1
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- cold rolling
- hardness
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Definitions
- the present invention relates to forged rolls for cold rolling and more particularly to working rolls intended for the rolling of iron and steels, non-ferrous metals and their alloys at temperatures less than or equal to 100 * , and, optionally , support rolls used in multi-cylinder rolling mills.
- tempering allowing the hardness of the lata to be adjusted.
- ble classic quenching mode with heating to a temperature> AC3 of the entire cylinder during austenitization, surface quenching after heating to a temperature> AC3 only of a layer of relatively small thickness, more or less cooling conditions well adjusted.
- the grades currently used for working rolls for cold rolling in forged steel quenched with water comprise from 0.8 to 0.9 liters of carbon, from 1.8 to 3.0% of chromium as well as other alloying elements and are illustrated by the conventional grade 83 CDV7 which precisely has a sufficiently high carbon content to enable the high levels of hardness required to be obtained, the contents of Cr, Mo, V are sufficient to have correct quenchability and the formation of numerous carbides ensuring good resistance to wear.
- quenching depths require at least two reprocessings.
- the present invention aims to remedy these drawbacks, while making it possible to obtain forged cylinders having a large thickness of hardened layer.
- the essential characteristic of the invention resides in the Si content which causes asso ciation with Mn a synergistic effect on hardenability for a steel with a low content of alloying element and in particular Mo.
- the structure corresponding to the hardness of 63 HRC is almost completely martensitic with a maximum of 10% bainite, so that the criterion adopted is entirely representative of the conditions of use of the cylinders.
- FIG. 2 graphically representing the influence of the addition elements Mo, Mn and Si on the hardenability of a steel 85 CDV7 having undergone an austenitization treatment ACm +, 60 * C.
- the ordinate distance Jominy i.e. the distance in mm to the end of a standard test piece (25 mm in diameter) for which the Rockwell C hardness (HRC) is greater than or equal to 60.
- Si has a synergistic effect on Mo and especially on Mn.
- Fig. 3 gives a representation (Hardness as a function of the distance D at the hardened end) of the Jominy curves for a conventional grade which is an 85 CDV7 steel whose Mn contents are 0.25 and Si of 0.42 and for a range of steel grades according to the invention.
- the increase in hardness at 70 mm from 45 HRC to 63 HRC is particularly significant.
- Silicon also increases resistance to tempering. Its action can therefore only be beneficial during small rolling incidents leading to an increase in the surface temperature of the rolls.
- a working cylinder with a table diameter of 325 mm and a table length of 1324 mm is produced at a table hardness of 760 Vickers, or 92 Shore C, intended for the cold rolling of silicon steel coils.
- the final treatment of the table is carried out by heating, low frequency surface (50 Hz) and quenching with water.
- This cylinder gives, after low frequency surface quenching, a thickness of quenched layer of 20.5 mm.
- the invention therefore provides an increase of 40 1 in the thickness of the hardened layer, in a less costly shade both in terms of the constituent elements and of the manufacturing process.
- the cylinders in the steel grade according to the present invention used in a reversible quarto rolling mill made it possible to laminate 3690 tonnes instead of 3100 tonnes for the comparison grade, ie a gain of 19%.
- the surface hardness is 875 HV.
- the hardened depth corresponding to a hardness of 700 HV, or substantially 85 Shore C, is 29.6 mm.
- the useful thickness of the cylinders being 27 mm, we can use all of this thickness before disposal without reprocessing by cylinder overheating.
- the grade according to the present invention limits the total use to reprocessing. of this thickness, while it is necessary to carry out two reprocessings with the nuance of comparison.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Forging (AREA)
Abstract
L'invention est relative à un cylindre forgé pour laminage à froid réalisé en acier faiblement allié, caractérisé en ce qu'il présente la composition pondérale suivante: C: 0,76 à 0,92; Mn: 0,70 à 1,40; Si: 0,70 à 1,40; S <= 0,020; P <= 0,025; Ni <= 0,60; Cr: 1,50 à 2,20; Mo: 0,15 à 0,55; V: 0,08 à 0,25; Cu <= 0,50; le reste étant du fer et des impuretés accidentelles.The invention relates to a forged cylinder for cold rolling made of low-alloy steel, characterized in that it has the following weight composition: C: 0.76 to 0.92; Mn: 0.70 to 1.40; If: 0.70 to 1.40; S <= 0.020; P <= 0.025; Ni <= 0.60; Cr: 1.50 to 2.20; Mo: 0.15 to 0.55; V: 0.08 to 0.25; Cu <= 0.50; the remainder being iron and accidental impurities.
Description
La présente invention est relative à des cylindres forgés pour laminage à froid et plus particulièrement des cylindres de travail destinés au laminage du fer et des aciers, des métaux non ferreux et de leurs alliages à des températures inférieures ou égales à 100*, et, éventuellement, des cylindres d'appui utilisés dans les laminoirs multicylindres.The present invention relates to forged rolls for cold rolling and more particularly to working rolls intended for the rolling of iron and steels, non-ferrous metals and their alloys at temperatures less than or equal to 100 * , and, optionally , support rolls used in multi-cylinder rolling mills.
Pour assurer une excellente tenue en service au moindre coût, les cylindres de travail doivent présenter en l'état d'utilisation un certain nombre de" caractéristiques :
- 1 - Une dureté superficielle élevée comprise entre 90 et 105 Shore C selon les produits à laminer.
- 2 - Une forte épaisseur de la couche trempée qui permettra de limiter ou même d'éliminer les retraitements éventuellement nécessaires au maintien de la dureté désirée sur toute l'épaisseur donnée d'utilisation du cylindre.
- 3 - Une grande résistance à l'usure par l'abrasion.
- 4 - Une teneur contrôlée de l'austénite résiduelle de la couche trempée ; des teneurs trop élevées en austénite résiduelle étant nuisibles en favorisant la fissuration sous contrainte en service.
- 5 - Une structure dendritique des couches superficielles suffisamment homogène pour éviter un phénomène de gravage extrêmement fin du feuillard auquel les professionnels donnent le nom de "peau de crapaud", "peau d'orange", ....
- 1 - A high surface hardness between 90 and 105 Shore C depending on the products to be laminated.
- 2 - A large thickness of the hardened layer which will limit or even eliminate any reprocessing necessary to maintain the desired hardness over the entire given thickness of use of the cylinder.
- 3 - High resistance to abrasion wear.
- 4 - A controlled content of the residual austenite in the hardened layer; excessively high contents of residual austenite being harmful by favoring cracking under stress in service.
- 5 - A dendritic structure of the surface layers sufficiently homogeneous to avoid an extremely fine etching phenomenon of the strip to which the professionals give the name of "toad skin", "orange skin", ...
Un grand nombre de ces caractéristiques peut être réglé par un choix judicieux des conditions de fabrication des cylindres de laminoirs à froid et tout particulièrement des opérations de traitement thermique : revenu permettant d'ajuster la dureté de la.table, mode de trempe classique avec chauffage à une température > AC3 de la totalité du cylindre lors de l'austénitisation, trempe superficielle après chauffage à une température > AC3 uniquement d'une couche d'épaisseur relativement faible, conditions de refroidissement plus ou moins bien ajustées.A large number of these characteristics can be adjusted by a judicious choice of the conditions of manufacture of the rolls of cold rolling mills and more particularly of the heat treatment operations: tempering allowing the hardness of the lata to be adjusted. ble, classic quenching mode with heating to a temperature> AC3 of the entire cylinder during austenitization, surface quenching after heating to a temperature> AC3 only of a layer of relatively small thickness, more or less cooling conditions well adjusted.
Néanmoins, le choix de la nuance reste primordial en vue de permettre l'optimisation des caractéristiques exigées au moindre coût.However, the choice of shade remains essential in order to allow the optimization of the required characteristics at the lowest cost.
Les nuances actuellement utilisées pour les, cylindres de travail pour laminage à froid en acier forgé trempé à l'eau comportent de 0,8 à 0, 9 1 de carbone, de 1,8 à 3,0 Z de chrome ainsi que d'autres éléments d'alliages et sont illustrées par la nuance classique 83 CDV7 qui a justement une teneur suffisamment élevée en carbone pour permettre d'obtenir les hauts niveaux de dureté exigés, les teneurs en Cr, Mo, V sont suffisantes pour avoir une trempabilité correcte et la formation de nombreux carbures assurant la bonne résistance à l'usure. Avec des traitements de chauffage classique suivis d'une trempe à l'eau énergique, on peut ainsi facilement obtenir une dureté superficielle de 103 Shore C, une profondeur de couche trempée à dureté ≥ 85 Schore C de 15 mm, sur des cylindres de diamètre de table de 550 à 650 mm.The grades currently used for working rolls for cold rolling in forged steel quenched with water comprise from 0.8 to 0.9 liters of carbon, from 1.8 to 3.0% of chromium as well as other alloying elements and are illustrated by the conventional grade 83 CDV7 which precisely has a sufficiently high carbon content to enable the high levels of hardness required to be obtained, the contents of Cr, Mo, V are sufficient to have correct quenchability and the formation of numerous carbides ensuring good resistance to wear. With conventional heating treatments followed by energetic water quenching, it is thus easy to obtain a surface hardness of 103 Shore C, a hardened layer depth at hardness ≥ 85 Schore C of 15 mm, on cylinders of diameter from 550 to 650 mm.
Avec une trempe superficielle après chauffage par induction à la fréquence de 50 Hz on obtient des duretés superficielles analogues avec toutefois une couche trempée de plus grande profondeur 22 mm environ.With a surface hardening after induction heating at a frequency of 50 Hz, similar surface hardnesses are obtained, with however a hardened layer of greater depth approximately 22 mm.
Cependant pour exploiter totalement l'épaisseur utile de la table, de telles profondeurs de trempe nécessitent au minimum deux retraitements.However, to fully exploit the useful thickness of the table, such quenching depths require at least two reprocessings.
Ces retraitements sont coûteux, aussi de nombreux fabricants ont cherché à améliorer la trempabilité de l'acier pour obtenir des couches trempées épaisses de 30 mm environ, limitant alors le nombre de retraitements à une seule opération.These restatements are expensive, also from Many manufacturers have sought to improve the hardenability of the steel in order to obtain toughened layers which are approximately 30 mm thick, thus limiting the number of reprocesses to a single operation.
Afin d'accroitre cette épaisseur on s'est orienté vers des aciers plus fortement alliés ayant des teneurs en Cr allant jusqu'à 3 X et en Mo jusqu'à 0,5 %. Outre que ces éléments d'alliage sont coûteux, l'augmentation de leur teneur présente le grave inconvénient d'engendrer un taux d'austénite résiduelle indésirable après la trempe martensitique.In order to increase this thickness, we turned to more highly alloyed steels with Cr contents up to 3 X and in Mo up to 0.5%. In addition to the fact that these alloying elements are expensive, the increase in their content has the serious disadvantage of generating an undesirable residual austenite level after the martensitic quenching.
On peut remédier à des taux d'austénite résiduelle élevés par un traitement après trempe consistant à plonger le cylindre dans l'azote liquide (traitement subzéro), mais ces traitements sont délicats et coûteux.High residual austenite levels can be remedied by a treatment after quenching consisting of immersing the cylinder in liquid nitrogen (subzero treatment), but these treatments are delicate and expensive.
Enfin l'augmentation de la teneur en éléments d'alliage Cr, Mo, V amène la formation d'une structure de bandes et d'une structure dendritique néfastes à la qualité de surface des produits laminés.Finally, the increase in the content of Cr, Mo, V alloy elements leads to the formation of a band structure and a dendritic structure which are harmful to the surface quality of the rolled products.
La présente invention vise à remédier à ces inconvénients, tout en permettant d'obtenir des cylindres forgés possédant une grande épaisseur de couche trempée.The present invention aims to remedy these drawbacks, while making it possible to obtain forged cylinders having a large thickness of hardened layer.
Elle a aussi pour objet un cylindre forgé pour laminage à froid réalisé en acier faiblement allié, caractérisé en ce qu'il présente la composition pondérale suivante :
- C : 0,76 à 0,92 ; Mn : 0,70 à 1,40 ; Si : 0,70 à 1,40; S ≤ 0.020 ; P ≤ 0,025 ; Ni ≤ 0,60 ; Cr : 1,50 à 2,20 ; Mo : 0,15 à 0,55 ; V : 0,08 à 0,25 ; Cu ≤ 0,50 ; le reste étant du fer et des impuretés accidentelles.
- C: 0.76 to 0.92; Mn: 0.70 to 1.40; If: 0.70 to 1.40; S ≤ 0.020; P ≤ 0.025; Ni ≤ 0.60; Cr: 1.50 to 2.20; Mo: 0.15 to 0.55; V: 0.08 to 0.25; Cu ≤ 0.50; the remainder being iron and accidental impurities.
La caractéristique essentielle de l'invention réside dans la teneur en Si qui provoque en association avec le Mn un effet de synergie sur la trempabilité pour un acier à faible teneur en élément d'alliage et en particulier Mo.The essential characteristic of the invention resides in the Si content which causes asso ciation with Mn a synergistic effect on hardenability for a steel with a low content of alloying element and in particular Mo.
Les travaux de Jatezack et Gérardi dans les articles ci-après :
- Multiplying factors of the calculation of Hardenability of Hypereutectoid steels Hardened from 1700° F. C.F. Jatezack and D.J. Girardi transaction of ASM 1959
- - 51 p 335 ; et
- Hardenability of high carbon steel C.F. Jatezack and D.J. Girardi Metallurgical transaction - vol 4 Oct 73 p 2267 ;
- décrivent l'influence des éléments d'alliages sur la trempabilité des aciers hypereutectoides, et caractérisent la trempabilité des différentes nuances par la distance à l'extrémité trempée du point Jominy où la dureté est 63 HRC, sur éprouvettes Jominy austéni- tisées à des températures comprises entre ACm + 50 et Acm + 100.
- Multiplying factors of the calculation of Hardenability of Hypereutectoid steels Hardened from 1700 ° FCF Jatezack and DJ Girardi transaction of ASM 1959
- - 51 p 335; and
- Hardenability of high carbon steel CF Jatezack and DJ Girardi Metallurgical transaction - vol 4 Oct 73 p 2267;
- describe the influence of alloying elements on the hardenability of hypereutectoid steels, and characterize the hardenability of the different grades by the distance from the hardened end of the Jominy point where the hardness is 63 HRC, on Jominy austenitized test pieces at temperatures between ACm + 50 and Acm + 100.
La structure correspondant à la dureté de 63 HRC est presque totalement martensitique avec au maximum 10 % de bainite, de sorte que le critère adopté est tout à fait représentatif des conditions d'utilisation des cylindres.The structure corresponding to the hardness of 63 HRC is almost completely martensitic with a maximum of 10% bainite, so that the criterion adopted is entirely representative of the conditions of use of the cylinders.
Ces travaux mettent en évidence que l'augmentation de trempabilité peut être obtenue par utilisation de teneurs plus fortes en éléments d'alliage classiques tel que Mn, Ni, Cr, V, Si et surtout Mo comme indiqué par les graphes des Fig Ia et Ib illustrant le facteur multiplicatif F sur la distance à l'extrémité trempée en fonction de la teneur en divers éléments indiqués, pour une structure initiale respectivement normalisée et recuite.These works show that the increase in hardenability can be obtained by using higher contents of conventional alloying elements such as Mn, Ni, Cr, V, Si and especially Mo as indicated by the graphs of Fig Ia and Ib illustrating the multiplicative factor F over the distance to the quenched end as a function of the content of various elements indicated, for an initial structure respectively normalized and annealed.
Il apparait nettement sur ces graphes que Mo exerce la plus forte action et en particulier supérieure au Si seul ou même combiné et au Mn.It clearly appears on these graphs that Mo exerts the strongest action and in particular superior to Si alone or even combined and to Mn.
Or la demanderesse a découvert que contrairement aux enseignements de ces travaux, Mo exerce une influence sur la trempabilité présentant un maximum pour des teneurs relativement faibles.However, the Applicant has discovered that, contrary to the teachings of this work, Mo exerts an influence on the hardenability, presenting a maximum for relatively low contents.
Ces résultats sont donnés à la Fig. 2 représentant graphiquement l'influence des éléments d'addition Mo, Mn et Si sur la trempabilité d'un acier 85 CDV7 ayant subi un traitement d'austénitisation ACm +, 60*C. Sur ce graphe est portée en ordonnée la distance Jominy, c'est-à-dire la distance en mm à l'extrémité d'une éprouvette normalisée (25 mm de diamètre) pour laquelle la dureté Rockwell C (HRC) est supérieure ou égale à 60.These results are given in FIG. 2 graphically representing the influence of the addition elements Mo, Mn and Si on the hardenability of a steel 85 CDV7 having undergone an austenitization treatment ACm +, 60 * C. On this graph is plotted the ordinate distance Jominy, i.e. the distance in mm to the end of a standard test piece (25 mm in diameter) for which the Rockwell C hardness (HRC) is greater than or equal to 60.
Par ailleurs il apparait que Si exerce un effet synergique sur Mo et surtout sur Mn.Furthermore, it appears that Si has a synergistic effect on Mo and especially on Mn.
A titre de comparaison, la Fig. 3 donne une représentation (Dureté en fonction de la distance D à l'extrémité trempée) des courbes Jominy pour une nuance classique qui est un acier 85 CDV7 dont les teneurs en Mn sont de 0,25 et Si de 0,42 et pour une plage d'aciers à nuance selon l'invention.For comparison, Fig. 3 gives a representation (Hardness as a function of the distance D at the hardened end) of the Jominy curves for a conventional grade which is an 85 CDV7 steel whose Mn contents are 0.25 and Si of 0.42 and for a range of steel grades according to the invention.
L'accroissement de la dureté à 70 mm de 45 HRC à 63 HRC est particulièrement significative.The increase in hardness at 70 mm from 45 HRC to 63 HRC is particularly significant.
De plus la présence de silicium tend à favoriser la formation des carbures, qui est favorable pour la tenue à l'usure comme l'ont montré les différents tests de laboratoire utilisés.In addition, the presence of silicon tends to favor the formation of carbides, which is favorable for wear resistance as shown by the various laboratory tests used.
On observe par contre une légère diminution de la teneur en carbone de la matrice de l'acier et par conséquent du niveau maximum de dureté pouvant être obtenu ; ce n'est pas un inconvénient car il suffit de jouer sur les conditions du revenu après trempe entre 100 et 200°C.On the other hand, there is a slight decrease in the carbon content of the steel matrix and therefore in the maximum level of hardness that can be obtained; it is not a disadvantage because it is enough to play on the conditions of the income after quenching between 100 and 200 ° C.
Le silicium augmente en outre la résistance au revenu. Son action ne peut donc qu'être bénéfique lors des petits incidents de laminage entrainant une élévation de la température superficielle des cylindres.Silicon also increases resistance to tempering. Its action can therefore only be beneficial during small rolling incidents leading to an increase in the surface temperature of the rolls.
L'absence d'influence significative des additions de Mn et Si sur le taux d'austénite résiduelle après traitement et sur la ténacité du métal traité au niveau de 64 HRC a été vérifiée dans le domaine des teneurs choisies. Il en est de même pour la structure dendritique à la surface des tables. L'addition conjuguée de manganèse et silicium s'est révélée bénéfique pour la tenue en service du cylindre.The absence of significant influence of the additions of Mn and Si on the rate of residual austenite after treatment and on the toughness of the metal treated at the level of 64 HRC has been verified in the field of the selected contents. It is the same for the dendritic structure on the surface of the tables. The combined addition of manganese and silicon has proved beneficial for the service life of the cylinder.
Les exemples ci-après sont donnés à titre d'illustration de l'invention.The examples below are given by way of illustration of the invention.
On réalise un cylindre de travail de diamètre de table 325 mm et de longueur de table 1324 mm à une dureté de table de 760 Vickers, soit 92 Shore C, destiné au laminage à froid de bobines en acier au silicium.A working cylinder with a table diameter of 325 mm and a table length of 1324 mm is produced at a table hardness of 760 Vickers, or 92 Shore C, intended for the cold rolling of silicon steel coils.
Ce cylindre est usiné à partir d'une ébauche forgée dans un lingot d'acier ayant l'analyse suivante :
- C 0,83 -
Mn 1,12 - Si 0,89 - S 0,009 - P 0,012 - Ni 0,33 -Cr 1,82 - Mo 0,25 - V 0,11.
- C 0.83 - Mn 1.12 - Si 0.89 - S 0.009 - P 0.012 - Ni 0.33 - Cr 1.82 - Mo 0.25 - V 0.11.
Le traitement final de la table est réalisé par chauffage ,superficiel basse fréquence (50 Hz) et trempe à l'eau.The final treatment of the table is carried out by heating, low frequency surface (50 Hz) and quenching with water.
On obtient ainsi une épaisseur de la couche trempée de 28,5 mm.This gives a thickness of the hardened layer of 28.5 mm.
A titre de comparaison on réalise un cylindre analogue dans la nuance classique :
- C 0,83 - Mn 0,29 - Si 0,33 - S 0,007 - P 0,014 - Ni 0,27 -
Cr 1,77 - Mo 0,24 - V 0,11.
- C 0.83 - Mn 0.29 - Si 0.33 - S 0.007 - P 0.014 - Ni 0.27 - Cr 1.77 - Mo 0.24 - V 0.11.
Ce cylindre donne après trempe superficielle basse fréquence une épaisseur de couche trempée de 20,5 mm.This cylinder gives, after low frequency surface quenching, a thickness of quenched layer of 20.5 mm.
On obtient donc grâce à l'invention un accroissement de 40 1 de l'épaisseur de la couche trempée, dans une nuance moins coûteuse tant au plan des éléments constitutifs que du procédé de fabrication.The invention therefore provides an increase of 40 1 in the thickness of the hardened layer, in a less costly shade both in terms of the constituent elements and of the manufacturing process.
Les cylindres dans la nuance d'acier selon, la présente invention utilisés dans un laminoir quarto réversible ont permis de laminer 3690 tonnes au lieu de 3100 tonnes pour la nuance de comparaison, soit un gain de 19 %.The cylinders in the steel grade according to the present invention used in a reversible quarto rolling mill made it possible to laminate 3690 tonnes instead of 3100 tonnes for the comparison grade, ie a gain of 19%.
On réalise un cylindre de travail pour laminage à froid de tôle de carrosserie automobile ayant les caractéristiques suivantes :
- C 0,86 - Mn 0,96 -
Si 1,19 - S 0,004 - P 0,012 - Ni 0.175_ Cr 1.66 - Mo 0,22 - V 0,096.
- C 0.86 - Mn 0.96 - Si 1.19 - S 0.004 - P 0.012 - Ni 0.175_ Cr 1.66 - Mo 0.22 - V 0.096.
Le traitement final de la table est réalisé comme à l'exemple 1.The final processing of the table is carried out as in Example 1.
Après détensionnement et avant ajustement de la dureté, la dureté superficielle est de 875 HV.After stress relieving and before adjusting the hardness, the surface hardness is 875 HV.
La profondeur trempée correspondant à une dureté de 700 HV, soit sensiblement 85 Shore C, est de 29,6 mm.The hardened depth corresponding to a hardness of 700 HV, or substantially 85 Shore C, is 29.6 mm.
L'épaisseur utile des cylindres étant de 27 mm, on peut utiliser la totalité de cette épaisseur avant mise au rebut sans retraitement par retrempe du cylindre.The useful thickness of the cylinders being 27 mm, we can use all of this thickness before disposal without reprocessing by cylinder overheating.
Avec des cylindres en nuance classique 83 CDV 7, analogue à celle de l'exemple 1, l'épaisseur de la couche trempée, après trempe superficielle basse fréquence, mesurée dans les mêmes conditions est de 22 mm. Ceci impose un retraitement pour consommer la totalité de l'épaisseur utile du cylindre.With cylinders in conventional grade 83 CDV 7, similar to that of Example 1, the thickness of the hardened layer, after low frequency surface hardening, measured under the same conditions is 22 mm. This requires reprocessing to consume the entire useful thickness of the cylinder.
Il est évident que pour un cylindre de même caractéristiques géométriques que précédemment, mais, dont le diamètre de table a été porté à 581 mm et l'épaisseur utile à 50 mm, la nuance selon la présente invention limite à un retraitement l'utilisation totale de cette épaisseur, alors qu'il est nécessaire de réaliser deux retraitements avec la nuance de comparaison.It is obvious that for a cylinder with the same geometrical characteristics as previously, but, the table diameter of which has been increased to 581 mm and the useful thickness of 50 mm, the grade according to the present invention limits the total use to reprocessing. of this thickness, while it is necessary to carry out two reprocessings with the nuance of comparison.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86401434T ATE40859T1 (en) | 1985-07-08 | 1986-06-27 | LIGHT ALLOY FORGED STEEL CYLINDER FOR COLD ROLLING. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8510426A FR2584318B1 (en) | 1985-07-08 | 1985-07-08 | FORGED CYLINDER FOR COLD LAMINATION IN LOW ALLOY STEEL |
FR8510426 | 1985-07-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0209437A1 true EP0209437A1 (en) | 1987-01-21 |
EP0209437B1 EP0209437B1 (en) | 1989-02-22 |
Family
ID=9321073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86401434A Expired EP0209437B1 (en) | 1985-07-08 | 1986-06-27 | Lightly alloyed, forged steel cylinder for cold rolling |
Country Status (9)
Country | Link |
---|---|
US (1) | US4823451A (en) |
EP (1) | EP0209437B1 (en) |
JP (1) | JPS6264412A (en) |
CN (1) | CN86104669A (en) |
AT (1) | ATE40859T1 (en) |
CA (1) | CA1282983C (en) |
DE (1) | DE3662123D1 (en) |
ES (1) | ES2001091A6 (en) |
FR (1) | FR2584318B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2685348A1 (en) * | 1991-12-24 | 1993-06-25 | Thyssen Edelstaslwerke Ag | USE OF STEEL FOR COLD ROLLING. |
CN101798660B (en) * | 2010-01-11 | 2011-07-20 | 段岳君 | Method for refining, metamorphosing and casting cold roll steel by casting instead of forging |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI88420B (en) * | 1991-03-20 | 1993-01-29 | Valmet Paper Machinery Inc | FOERFARANDE FOER FRAMSTAELLNING AV EN VALS OCH EN VALS |
US5611143A (en) * | 1994-10-21 | 1997-03-18 | Voith Sulzer Paper Technology North America, Inc. | Process for making chilled iron rolls |
JP3233188B2 (en) * | 1995-09-01 | 2001-11-26 | 住友電気工業株式会社 | Oil-tempered wire for high toughness spring and method of manufacturing the same |
US5928442A (en) * | 1997-08-22 | 1999-07-27 | Snap-On Technologies, Inc. | Medium/high carbon low alloy steel for warm/cold forming |
CN100404720C (en) * | 2005-03-29 | 2008-07-23 | 宝钢集团常州轧辊制造公司 | Alloy for producing cold rolled working roll and method for producing same |
US7976944B2 (en) * | 2009-01-02 | 2011-07-12 | The Hong Kong Polytechnic University | Temperature-regulating fiber and a method of making the same |
CN102691005B (en) * | 2011-03-25 | 2014-06-04 | 宝钢特钢有限公司 | Low alloy die steel |
CN102912242B (en) * | 2012-10-22 | 2014-07-02 | 宁波吉威熔模铸造有限公司 | Low alloy steel |
CN103215514B (en) * | 2013-05-07 | 2016-02-03 | 耿震宇 | Be applicable to cold roll and the manufacture method thereof of cold rolled silicon steel |
CN103774053B (en) * | 2013-12-19 | 2015-11-25 | 马鞍山市方圆材料工程有限公司 | A kind of composite roll upper layer high hardness alloy steel and preparation method thereof |
CN105177451A (en) * | 2015-08-31 | 2015-12-23 | 铜陵市大成轧辊有限责任公司 | Manufacturing process for cold roll of lithium battery protective board |
CN105349901A (en) * | 2015-08-31 | 2016-02-24 | 铜陵市大成轧辊有限责任公司 | Preparation process for steel-cast roller |
CN105349899A (en) * | 2015-08-31 | 2016-02-24 | 铜陵市大成轧辊有限责任公司 | Preparation process for steel-cast supporting roller |
CN105200333A (en) * | 2015-08-31 | 2015-12-30 | 铜陵市大成轧辊有限责任公司 | Method for preparing cold roll of lithium battery protection plate |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE439190A (en) * | 1939-09-02 | |||
DE3006512A1 (en) * | 1980-02-21 | 1981-11-26 | Thyssen Edelstahlwerke AG, 4000 Düsseldorf | Alloy tool steel for mfg. cold rolls - where steel has deep hardening properties obtd. by oil quenching, so rolls have long working life |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE539190A (en) * | ||||
DE1262612B (en) * | 1961-01-23 | 1968-03-07 | Bethlehem Steel Corp | Use of steel alloys as a material for rollers |
US3530703A (en) * | 1966-06-10 | 1970-09-29 | Kanto Special Steel Works Ltd | Quench hardened roll of forged steel containing cobalt |
-
1985
- 1985-07-08 FR FR8510426A patent/FR2584318B1/en not_active Expired
-
1986
- 1986-06-27 AT AT86401434T patent/ATE40859T1/en not_active IP Right Cessation
- 1986-06-27 DE DE8686401434T patent/DE3662123D1/en not_active Expired
- 1986-06-27 EP EP86401434A patent/EP0209437B1/en not_active Expired
- 1986-07-07 CA CA000513178A patent/CA1282983C/en not_active Expired - Lifetime
- 1986-07-07 CN CN198686104669A patent/CN86104669A/en active Pending
- 1986-07-08 JP JP61160678A patent/JPS6264412A/en active Pending
- 1986-07-08 ES ES8601098A patent/ES2001091A6/en not_active Expired
-
1988
- 1988-03-03 US US07/166,800 patent/US4823451A/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE439190A (en) * | 1939-09-02 | |||
DE3006512A1 (en) * | 1980-02-21 | 1981-11-26 | Thyssen Edelstahlwerke AG, 4000 Düsseldorf | Alloy tool steel for mfg. cold rolls - where steel has deep hardening properties obtd. by oil quenching, so rolls have long working life |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2685348A1 (en) * | 1991-12-24 | 1993-06-25 | Thyssen Edelstaslwerke Ag | USE OF STEEL FOR COLD ROLLING. |
BE1006545A3 (en) * | 1991-12-24 | 1994-10-11 | Thyssen Edelstahlwerke Ag | Use of steel cold rolling. |
CN101798660B (en) * | 2010-01-11 | 2011-07-20 | 段岳君 | Method for refining, metamorphosing and casting cold roll steel by casting instead of forging |
Also Published As
Publication number | Publication date |
---|---|
FR2584318A1 (en) | 1987-01-09 |
CA1282983C (en) | 1991-04-16 |
US4823451A (en) | 1989-04-25 |
ATE40859T1 (en) | 1989-03-15 |
JPS6264412A (en) | 1987-03-23 |
CN86104669A (en) | 1987-02-18 |
FR2584318B1 (en) | 1987-11-20 |
EP0209437B1 (en) | 1989-02-22 |
DE3662123D1 (en) | 1989-03-30 |
ES2001091A6 (en) | 1988-04-16 |
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