FR2818289A1 - Stainless steel for severe working and notably for deep drawing of rolled and heat treated steel sheet with controlled selection of inclusions - Google Patents

Stainless steel for severe working and notably for deep drawing of rolled and heat treated steel sheet with controlled selection of inclusions Download PDF

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FR2818289A1
FR2818289A1 FR0016355A FR0016355A FR2818289A1 FR 2818289 A1 FR2818289 A1 FR 2818289A1 FR 0016355 A FR0016355 A FR 0016355A FR 0016355 A FR0016355 A FR 0016355A FR 2818289 A1 FR2818289 A1 FR 2818289A1
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inclusions
less
steel
composition
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FR2818289B1 (en
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Etienne Havette
Jean Lehmann
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USINOR SA
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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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/004—Dispersions; Precipitations
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0405—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing of ferrous alloys

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Stainless steel comprises (by weight): 5 \* 10<-3> to 100 \* 10<-3> % carbon; 0.2 to 2 % manganese; 10 to 23 % chromium; 0 to 17 % nickel; 0.1 to 2 % silicon; less than 3 % molybdenum; less than 4% copper; and less than 30 \* 10<-3> % sulfur. It also has controlled contents of the following elements: 1\*10<-3> to 100\*10<-3> % titanium; 1\*10<-3> to 400\*10<-3> % nitrogen; less than 40\*10<-4> % aluminum; less than 20 \* 10<-4> % magnesium; 4 \* 10<-3> to 20 \* 10<-3> % oxygen; and the rest being iron and residual production impurities and incorporating globular inclusions containing mainly titanium oxide. The stainless steel has an austenitic microstructure after heat treatment.

Description

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Acier inoxydable pour une mise en forme sévère et notamment l'emboutissage profond d'une tôle. Stainless steel for severe shaping and in particular deep drawing of a sheet.

La présente invention concerne un acier inoxydable pour une mise en forme sévère et notamment l'emboutissage profond d'une tôle. L'acier comporte des inclusions adaptées pour cette utilisation. The present invention relates to a stainless steel for severe shaping and in particular the deep drawing of a sheet. Steel has inclusions suitable for this use.

Les aciers inoxydables ont une composition déterminée. La structure, par exemple austénitique, est assurée, après transformation, par un traitement thermique de type hyper trempe. Stainless steels have a specific composition. The structure, for example austenitic, is ensured, after transformation, by a heat treatment of the hyper quenching type.

Du point de vue métallurgique, il est connu que certains éléments d'alliage entrant dans la composition de l'acier favorisent l'apparition de la phase ferrite de structure métallographique de type cubique centré. Ces éléments sont dits

Figure img00010001

alpha-gènes. Parmi ceux-ci figurent le chrome, le molybdène, le silicium. From a metallurgical point of view, it is known that certain alloying elements entering into the composition of steel promote the appearance of the ferrite phase with a metallographic structure of the centered cubic type. These elements are said
Figure img00010001

alpha-genes. Among these are chromium, molybdenum, silicon.

1
D'autres éléments dits gamma-gènes favorisent l'apparition de la phase austénite de structure métallographique de type cubique à faces centrées. Parmi ces éléments figurent le carbone, l'azote, le manganèse, le cuivre, le nickel. 1
Other elements called gamma-genes promote the appearance of the austenite phase of metallographic structure of the face-centered cubic type. Among these elements are carbon, nitrogen, manganese, copper, nickel.

Dans le domaine de la mise en forme sévère de tôle d'acier inoxydable, les déformations importantes provoquent en zones dites sales des défauts en forme de parabole, des défauts de surface en forme de paille, qui engendrent des déchirures de métal. In the field of severe shaping of stainless steel sheet, significant deformations in so-called dirty areas cause parabola-shaped defects, straw-shaped surface defects, which lead to tearing of metal.

Dans l'élaboration d'aciers inoxydables par exemple austénitiques, comme pour tous les autres aciers élaborés avec des moyens conventionnels et économiquement adaptés à la production de masse, la présence d'inclusions de type sulfures ou d'oxydes de composition variable est systématique et irrémédiable. En effet, les aciers inoxydables peuvent, à l'état liquide, contenir en solution, du fait des procédés d'élaboration, des teneurs en oxygène et en soufre

Figure img00010002

100. 10-3o/ de l'ordre de 100. 10-3%. Au cours du refroidissement de l'acier à l'état liquide ou solide, la solubilité des éléments oxygène et soufre diminue et l'énergie de formation des oxydes ou des sulfures est atteinte. On assiste alors à l'apparition d'inclusions formées d'une part, de composés de type oxydes contenant des éléments d'alliage ayant une grande affinité avec l'oxygène tels que calcium, magnésium, aluminium, silicium, manganèse, chrome, et d'autre part, de composés de type sulfures contenant des éléments d'alliage ayant une grande affinité avec le soufre tel que manganèse, chrome, calcium, magnésium. Il peut In the production of stainless steels, for example austenitic, as for all other steels produced with conventional means and economically suited to mass production, the presence of sulphide type inclusions or oxides of variable composition is systematic and irremediable. Indeed, stainless steels can, in the liquid state, contain in solution, due to the production processes, oxygen and sulfur contents
Figure img00010002

100. 10-3o / of the order of 100. 10-3%. During the cooling of steel in the liquid or solid state, the solubility of the elements oxygen and sulfur decreases and the energy of formation of oxides or sulphides is reached. We then witness the appearance of inclusions formed, on the one hand, of oxide-type compounds containing alloying elements having a high affinity with oxygen such as calcium, magnesium, aluminum, silicon, manganese, chromium, and on the other hand, sulfide type compounds containing alloying elements having a high affinity with sulfur such as manganese, chromium, calcium, magnesium. he can

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apparaître également des inclusions qui sont des composés mixtes de type oxysulfures. Inclusions also appear which are mixed compounds of the oxysulphide type.

Il est possible de réduire la quantité d'oxygène contenu dans l'acier inoxydable en utilisant des réducteurs puissants tels que magnésium, aluminium, calcium, titane ou une combinaison de plusieurs d'entre eux mais ces réducteurs conduisent généralement à la création de grosses inclusions riches en MgO, As203, CaO, Ti203 sous la forme de réfractaires cristallisés, durs et indéformables dans les conditions de laminage de l'acier. La présence de ces inclusions génère par exemple, les incidents cités ci-dessus dans le domaine de l'emboutissage profond. It is possible to reduce the amount of oxygen contained in stainless steel by using strong reducing agents such as magnesium, aluminum, calcium, titanium or a combination of several of them, but these reducing agents generally lead to the creation of large inclusions. rich in MgO, As203, CaO, Ti203 in the form of crystallized refractories, hard and dimensionally stable under the rolling conditions of steel. The presence of these inclusions generates, for example, the incidents mentioned above in the field of deep drawing.

On peut constater que pour une même composition d'un acier inoxydable, le type, la dimension, la forme, et le nombre des inclusions modifient le

Figure img00020001

comportement de l'acier sous forme de tôle dans sa fabrication comme dans son 1 utilisation. It can be seen that for the same composition of a stainless steel, the type, size, shape and number of inclusions modify the
Figure img00020001

behavior of steel in sheet form in its manufacture as well as in its 1 use.

L'invention a pour but la réalisation d'un acier inoxydable notamment austénitique comportant un type d'inclusion sélectionnée en composition et dimension, acier pouvant être utilisé sous forme de tôle dans le domaine de l'emboutissage profond. The object of the invention is to produce a stainless steel, in particular austenitic, comprising a type of inclusion selected in composition and size, which steel can be used in the form of a sheet in the field of deep drawing.

L'invention a pour objet un acier inoxydable de composition générale et pondérale suivante :

Figure img00020002

5. 10-3o/-3o - 5. 10'% < carbone s 100. 10-3%, - 0, 2% s manganèse s 2%, - 10% s chrome s 23%, - 0% < nicket < 17%, - 0, 1 % < silicium s 2%, - molybdène < 3%, - cuivre < 4%, - soufre s 30. 10-3%, du fer et des impuretés résiduelles inhérentes à l'élaboration, qui se caractérise eh ce que les éléments suivants sont contrôlés dans les teneurs : 30 10-30/ - 1. 10-3% s titane s 100. 10-3% 0 10-30/ 1. 10-30/ azotes 400. 10-3% 10-4o/ - aluminium < 40 10-4% The subject of the invention is a stainless steel of the following general and weight composition:
Figure img00020002

5.10-3o / -3o - 5. 10 '% <carbon s 100. 10-3%, - 0, 2% s manganese s 2%, - 10% s chromium s 23%, - 0% <nicket < 17%, - 0, 1% <silicon s 2%, - molybdenum <3%, - copper <4%, - sulfur s 30. 10-3%, iron and residual impurities inherent in the production, which are characterized by the fact that the following elements are controlled in the contents: 30 10-30 / - 1. 10-3% s titanium s 100. 10-3% 0 10-30 / 1. 10-30 / nitrogen 400. 10- 3% 10-4o / - aluminum <40 10-4%

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Figure img00030001

- calcium < 20 10-4% - magnésium < 20. 10-4% 0-3o/ 0 0-30/ - 4. 10'% < oxygène total 20. 10-3% pour l'obtention d'inclusions contenant principalement de l'oxyde de titane.
Figure img00030001

- calcium <20 10-4% - magnesium <20. 10-4% 0-3o / 0 0-30 / - 4. 10 '% <total oxygen 20. 10-3% for obtaining inclusions mainly containing titanium oxide.

Les autres caractéristiques de l'invention sont : - la composition de l'acier comprend moins de 15. 10-3% de soufre. The other characteristics of the invention are: the composition of the steel comprises less than 15.10-3% sulfur.

- la composition de l'acier comprend entre 5. 10-3% et 40. 10-3% de titane. - the composition of the steel comprises between 5.10-3% and 40. 10-3% titanium.

- la composition de l'acier comprend entre 6. 10-3% et 12. 10-3% d'oxygène. - the composition of the steel comprises between 6.10-3% and 12. 10-3% oxygen.

- lors de la réalisation d'une brame en coulée continue, après traitement à chaud et à froid, les inclusions sont dispersées et de diamètre moyen

Figure img00030002

inférieur à 10 um. - les inclusions principalement d'oxyde de titane Ti2O3, ont une taille inférieure à 3 um et de préférence inférieure à 1 um. - during the production of a continuous casting slab, after hot and cold treatment, the inclusions are dispersed and of average diameter
Figure img00030002

less than 10 µm. the inclusions, mainly of titanium oxide Ti2O3, have a size of less than 3 μm and preferably less than 1 μm.

- les inclusions contiennent en outre dans leur composition de l'oxyde de chrome et de manganèse respectivement dans des proportions inférieures à
15% et 10% et de préférence dans des proportions inférieures à 10% et 5%. - the inclusions also contain in their composition chromium and manganese oxide respectively in proportions of less than
15% and 10% and preferably in proportions of less than 10% and 5%.

- les inclusions peuvent être entourées, en faible proportion, d'une phase composée de Al2O3, Si02, CaO. - The inclusions can be surrounded, in small proportion, by a phase composed of Al2O3, Si02, CaO.

La description qui suit et la figure unique annexée, le tout donné à titre d'exemple, fera bien comprendre l'invention. The description which follows and the single appended figure, all given by way of example, will make the invention clearly understood.

La figure unique présente une image métallographique d'un exemple d'inclusion selon l'invention, dans ses dimenssions et dans sa composition. The single figure shows a metallographic image of an example of inclusion according to the invention, in its dimensions and in its composition.

L'acier selon l'invention contient dans sa composition pondérale,

Figure img00030003

0-3o/ 0 100. 10-30/ - 5. 10-3% < carbone < 100. 10-3%, - 0, 2% < manganèse < 2%, - 10% < chrome < 23%, - 0% < nickel 17%, - 0, 1% # silicium # 2%, - molybdène < 3%, cuivre c 4%, - soufre # 30. 10-3%,
Figure img00030004

1. 10-3o/ 0 100. 10-3o/ : titane 0 10-3o/ 1. 10-3o/ - 1. azote 400. 0 - 1. 1 0-3% azote < 400. 10-3%, The steel according to the invention contains in its composition by weight,
Figure img00030003

0-3o / 0 100. 10-30 / - 5. 10-3% <carbon <100. 10-3%, - 0, 2% <manganese <2%, - 10% <chromium <23%, - 0 % <nickel 17%, - 0, 1% # silicon # 2%, - molybdenum <3%, copper c 4%, - sulfur # 30. 10-3%,
Figure img00030004

1.10-3o / 0 100. 10-3o /: titanium 0 10-3o / 1. 10-3o / - 1. nitrogen 400. 0 - 1. 1 0-3% nitrogen <400. 10-3%,

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Figure img00040001

- aluminium 40 10-4%, 10-40/ - calcium < 20 10-4%, - magnésium < 20. 10-4%, 10-3o/10-30/ - 4. 10-3% oxygène total < 20. 10-3%, du fer et des impuretés résiduelles inhérentes à l'élaboration, composition dans laquelle les éléments titane, azote, aluminium, calcium, magnésium, oxygène total sont contrôlés pour générer dans l'acier des inclusions contenant principalement de l'oxyde de titane.
Figure img00040001

- aluminum 40 10-4%, 10-40 / - calcium <20 10-4%, - magnesium <20. 10-4%, 10-3o / 10-30 / - 4. 10-3% total oxygen <20 . 10-3%, of iron and residual impurities inherent in the production, composition in which the elements titanium, nitrogen, aluminum, calcium, magnesium, total oxygen are controlled to generate in the steel inclusions mainly containing titanium oxide.

Le carbone, l'azote, le chrome, le nickel, le manganèse, le silicium sont les éléments habituels permettant l'obtention d'un acier inoxydable par exemple austénitique. Carbon, nitrogen, chromium, nickel, manganese, silicon are the usual elements making it possible to obtain a stainless steel, for example austenitic.

Le molybdène peut être ajouté à la composition de l'acier inoxydable austénitique pour améliorer la tenue en corrosion et cela, dans une teneur maximale de 3%. Molybdenum can be added to the composition of austenitic stainless steel to improve corrosion resistance, in a maximum content of 3%.

Le cuivre peut être également ajouté à la composition de l'acier selon l'invention car il améliore les propriétés de déformation à froid et de ce fait, stabilise l'austénite. Cependant, la teneur en cuivre est limitée à moins de 4 % pour éviter des difficultés de transformation à chaud car le cuivre abaisse sensiblement la limite supérieure de température de réchauffage de l'acier avant laminage. Copper can also be added to the composition of the steel according to the invention because it improves the cold deformation properties and therefore stabilizes the austenite. However, the copper content is limited to less than 4% to avoid hot transformation difficulties because the copper significantly lowers the upper temperature limit for reheating the steel before rolling.

Les valeurs des teneurs en oxygène total sont, selon l'invention, comprises entre 4. 10-3% et 20. 10-3% et de préférence entre 6. 10-3% et 12. 10-3%. The values of the total oxygen contents are, according to the invention, between 4.10-3% and 20. 10-3% and preferably between 6.10-3% and 12. 10-3%.

Il participe à la formation de l'oxyde de titane et dans une plus faible proportion à la formation d'oxyde de chrome et de manganèse. It participates in the formation of titanium oxide and to a lesser extent in the formation of chromium and manganese oxide.

L'oxyde de titane est formé par le contrôle de l'aluminium et de l'oxygène associé à une addition de titane lors de la métallurgie en poche de l'acier. Titanium oxide is formed by the control of aluminum and oxygen associated with the addition of titanium during ladle metallurgy of steel.

Pour une teneur en oxygène total inférieure à 4 10-3%, l'oxygène fixe les éléments magnésium, calcium, aluminium et ne forme pas d'inclusion d'oxydes riches en Ti203.

Figure img00040002
For a total oxygen content of less than 4 10-3%, the oxygen fixes the elements magnesium, calcium, aluminum and does not form an inclusion of oxides rich in Ti203.
Figure img00040002

3o Pour une teneur en oxygène total supérieure à 20 10-3%, il y a, dans la composition des oxydes une forte proportion de Cr203'ce que l'on cherche à éviter. 3o For a total oxygen content greater than 20 10-3%, there is, in the composition of the oxides a high proportion of Cr 2 O 3 ′ which one seeks to avoid.

En d'autres termes, pour satisfaire, selon l'invention, la formation des inclusions de TO203, il faut contrôler les teneurs en oxygène et titane, contrôler In other words, to satisfy, according to the invention, the formation of the inclusions of TO203, it is necessary to control the oxygen and titanium contents, to control

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l'azote de façon à ne pas former des nitrures de titane, réduire dans la mesure du possible les teneurs en aluminium, calcium, magnésium, de façon que ces éléments dits réducteurs forts, ne favorisent pas la formation de spinelles comme par exemple du type AO3MgO. Lors de son élaboration, l'acier est désulfuré. nitrogen so as not to form titanium nitrides, reduce as far as possible the contents of aluminum, calcium, magnesium, so that these so-called strong reducing elements do not promote the formation of spinels such as for example of the type AO3MgO. During its production, the steel is desulfurized.

L'invention concerne un acier inoxydable contenant des inclusions de composition choisie, obtenue volontairement, la composition étant en relation

Figure img00050001

avec la composition globale de l'acier, de telle sorte que les inclusions soient dispersées, d'un diamètre moyen inférieur à 10 um, lors de la réalisation de la brame. The invention relates to a stainless steel containing inclusions of selected composition, obtained voluntarily, the composition being related
Figure img00050001

with the overall composition of the steel, such that the inclusions are dispersed, with an average diameter of less than 10 μm, during the production of the slab.

Selon l'invention, l'acier inoxydable pouvant être austénitique contient des inclusions de composition déterminée d'oxyde de titane qui se subdivisent en inclusions de diamètre moyen inférieur à 3 um et de préférence inférieure à 1 m lors de la transformation à chaud et à froid de la brame d'acier, inclusions sensiblement déformées et finement dispersées dans la matrice de l'acier. According to the invention, the stainless steel which may be austenitic contains inclusions of determined composition of titanium oxide which are subdivided into inclusions with a mean diameter of less than 3 μm and preferably less than 1 m during the hot transformation and at cold of the steel slab, inclusions noticeably deformed and finely dispersed in the steel matrix.

L'acier est élaboré avec les moyens d'élaboration classiques et très productifs d'une aciérie électrique tels que four électrique, convertisseur AOD, métallurgie en poche et coulée continue. The steel is produced with the classic and very productive means of elaboration of an electric steelworks such as electric furnace, AOD converter, ladle metallurgy and continuous casting.

Les inclusions d'oxydes, selon l'invention, sont composées essentiellement de Ti2O3, et peuvent contenir notamment, dans une moindre mesure, du Cr2O3 et ou du MnO. Dans un exemple d'inclusion, les proportions pondérales sont les suivantes, après coulée continue : - 70% # TiO2 # 90%, - 0% : Cr203 : 20%, - 0% < MnO < 10%. The oxide inclusions, according to the invention, are composed essentially of Ti2O3, and may contain in particular, to a lesser extent, Cr2O3 and / or MnO. In an inclusion example, the weight proportions are as follows, after continuous casting: - 70% # TiO2 # 90%, - 0%: Cr203: 20%, - 0% <MnO <10%.

Les inclusions obtenues lors de l'élaboration de l'acier peuvent contenir en proportion, moins de 10% d'Al2O3. The inclusions obtained during the production of steel may contain, in proportion, less than 10% of Al2O3.

Il est usuel de caractériser la concentration en inclusions par l'observation d'une coupe polie en sens long de laminage à chaud ou à froid. On appelle propriété inclusionnaire le résultat de cette caractérisation réalisée selon différentes normes en fonction de l'utilisation finale. It is usual to characterize the concentration of inclusions by observing a polished section in the long direction of hot or cold rolling. The inclusionary property is the result of this characterization carried out according to different standards depending on the end use.

La figure unique présente sur une coupe polie sens long d'une tôle laminée à froid d'épaisseur 1,2 mm, un exemple d'inclusion quasiment The single figure shows on a polished cross section of a cold rolled sheet 1.2 mm thick, an example of almost inclusion

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Figure img00060001

sphérique. Les inclusions sont peu déformées, dispersées, d'une taille d'environ 2 pom.
Figure img00060001

spherical. The inclusions are little deformed, scattered, about 2 pom size.

Dans un exemple d'application il a été réalisé un acier dont la composition pondérale est la suivante : carbone : 0, 042% ; azote : 0, 0213% ; manganèse : 1,020% ; chrome : 18,22% ; nickel : 8,6% ; silicium : 0,404% ; soufre : 0, 0032% ; titane : 0,019% ; molybdène : 0,267% ; cuivre : 0,202% ; phosphore : 0, 021% ; aluminium : 0,0028% ; calcium 0, 0011 %, oxygène total 0,0080%. du fer et des impuretés résiduelles inhérentes à l'élaboration. In an example of application, a steel was produced whose weight composition is as follows: carbon: 0.042%; nitrogen: 0.0213%; manganese: 1.020%; chromium: 18.22%; nickel: 8.6%; silicon: 0.404%; sulfur: 0.0032%; titanium: 0.019%; molybdenum: 0.267%; copper: 0.202%; phosphorus: 0.021%; aluminum: 0.0028%; calcium 0.0011%, total oxygen 0.0080%. iron and residual impurities inherent in the production.

Lors de l'élaboration en poche, le titane est introduit tout en contrôlant la teneur en oxygène de façon que l'oxyde de titane soit le composé majoritaire des inclusions. During ladle production, titanium is introduced while controlling the oxygen content so that titanium oxide is the major component of the inclusions.

Le tableau 1 suivant présente un exemple de compositions d'inclusions d'oxydes en fonction des étapes de l'élaboration de l'acier, métallurgie en poche avant coulée continue et après coulée. Table 1 below shows an example of oxide inclusion compositions as a function of the stages in the production of the steel, ladle metallurgy before continuous casting and after casting.

TABLEAU 1

Figure img00060002
TABLE 1
Figure img00060002

<tb>
<tb> Taille <SEP> Oxydes <SEP> %
<tb> élaboration <SEP> Inclusion
<tb> MgO <SEP> M203 <SEP> a02 <SEP> CaO <SEP> T) <SEP> 02 <SEP> Cr203 <SEP> MnO <SEP> FeO
<tb> Avant <SEP> 11, <SEP> 7 <SEP> 0, <SEP> 41 <SEP> 3, <SEP> 75 <SEP> 0, <SEP> 51 <SEP> 0, <SEP> 17 <SEP> 81, <SEP> 8 <SEP> 7, <SEP> 88 <SEP> 3, <SEP> 87 <SEP> 1,54
<tb> coulée
<tb> Après <SEP> 8,6 <SEP> 0,45 <SEP> 3,87 <SEP> 0,57 <SEP> 0,22 <SEP> 79,1 <SEP> 9,44 <SEP> 4,9 <SEP> 1,44
<tb> coulée
<tb>
- On remarque que les inclusions comportent en fin de traitement métallurgique en poche environ 80% d'oxyde de titane, et les inclusions monophasées comportent en milieu de coulée en distributeur, 77% de Ti2O3,

Figure img00060003

8% de Cr203 et 5% de MnO. Elles peuvent être entourées, en faible 1 proportion, d'une phase composée de Al203, Spi02, CaO.<tb>
<tb> Size <SEP> Oxides <SEP>%
<tb> elaboration <SEP> Inclusion
<tb> MgO <SEP> M203 <SEP> a02 <SEP> CaO <SEP> T) <SEP> 02 <SEP> Cr203 <SEP> MnO <SEP> FeO
<tb> Before <SEP> 11, <SEP> 7 <SEP> 0, <SEP> 41 <SEP> 3, <SEP> 75 <SEP> 0, <SEP> 51 <SEP> 0, <SEP> 17 <SEP> 81, <SEP> 8 <SEP> 7, <SEP> 88 <SEP> 3, <SEP> 87 <SEP> 1.54
<tb> casting
<tb> After <SEP> 8.6 <SEP> 0.45 <SEP> 3.87 <SEP> 0.57 <SEP> 0.22 <SEP> 79.1 <SEP> 9.44 <SEP> 4 , 9 <SEP> 1.44
<tb> casting
<tb>
- It is noted that the inclusions comprise at the end of the metallurgical treatment in the ladle approximately 80% of titanium oxide, and the single-phase inclusions comprise, in the middle of the casting in a distributor, 77% of Ti2O3,
Figure img00060003

8% Cr203 and 5% MnO. They may be surrounded, in a small proportion, by a phase composed of Al 2 O 3, SpiO 2, CaO.

Claims (8)

REVENDICATIONS 1. Acier inoxydable pour une mise en forme sévère et notamment l'emboutissage profond d'une tôle, ayant la composition pondérale suivante : 0-3o/ 0 10-30/ - 5. 10-3% < carbone < 100. 10-3%, - 0, 2% manganèse < 2%, - 10% : chrome < 23%, - 0% < nickel < 17%, - 0, 1 % < silicium < 2%, - molybdène < 3%, - cuivre < 4%, - soufrer 30. 10-3%, du fer et des impuretés résiduelles inhérentes à l'élaboration, caractérisé en ce que les éléments suivants sont contrôlés dans les teneurs : - 1. 10-3% titane < 100. 10-3%, - 1. 10-3% azote < 400. 10-3%, - aluminium < 40 10-4%, - calcium < 20 10-4%, 0-40/ - magnésium < 20. 10-4%, 10-3o/ - 4. 10-3% < oxygène total < 20. 10-3%, pour l'obtention d'inclusions contenant principalement de l'oxyde de titane. 1. Stainless steel for severe shaping and in particular deep drawing of a sheet, having the following weight composition: 0-3o / 0 10-30 / - 5. 10-3% <carbon <100. 10- 3%, - 0, 2% manganese <2%, - 10%: chromium <23%, - 0% <nickel <17%, - 0, 1% <silicon <2%, - molybdenum <3%, - copper <4%, - sulfur 30. 10-3%, of iron and residual impurities inherent in the production, characterized in that the following elements are controlled in the contents: - 1. 10-3% titanium <100. 10 -3%, - 1. 10-3% nitrogen <400. 10-3%, - aluminum <40 10-4%, - calcium <20 10-4%, 0-40 / - magnesium <20. 10-4 %, 10-3o / - 4. 10-3% <total oxygen <20. 10-3%, to obtain inclusions mainly containing titanium oxide. 2. Acier selon la revendication 1, caractérisé en ce que la composition de l'acier comprend moins de 15. 10-3% de soufre. 2. Steel according to claim 1, characterized in that the composition of the steel comprises less than 15. 10-3% sulfur. 3. Acier selon la revendication 1, caractérisé en ce que la composition de l'acier comprend entre 5. 10-3% et 40. 10-3% de titane. 3. Steel according to claim 1, characterized in that the composition of the steel comprises between 5. 10-3% and 40. 10-3% titanium. ; 4. Acier selon la revendication 1, caractérisé en ce que la composition de l'acier comprend entre 6. 10-3% et 12. 10-3% d'oxygène. ; 4. Steel according to claim 1, characterized in that the composition of the steel comprises between 6.10-3% and 12. 10-3% oxygen. <Desc/Clms Page number 8> <Desc / Clms Page number 8>
Figure img00080001
Figure img00080001
 5. Acier selon la revendication 1, caractérisé en ce que lors de la réalisation de la brame en coulée'continue, après traitement à chaud et à froid, les inclusions sont dispersées et de diamètre moyen inférieur à 10 um. 5. Steel according to claim 1, characterized in that during the production of the slab in continuous casting, after hot and cold treatment, the inclusions are dispersed and have an average diameter of less than 10 μm. 6. Acier selon la revendication 1, caractérisé en ce que les inclusions principalement d'oxyde de titane Ti2O3, ont une taille inférieure à 3 um et de préférence inférieure à 1um. 6. Steel according to claim 1, characterized in that the inclusions mainly of titanium oxide Ti2O3 have a size of less than 3 μm and preferably less than 1 μm. 7. Acier selon la revendication 1, caractérisé en ce que les inclusions contiennent en outre dans leur composition de l'oxyde de chrome et de manganèse respectivement dans des proportions inférieures à 15% et 10% et de préférence dans des proportions inférieures à 10% et 5%. 7. Steel according to claim 1, characterized in that the inclusions also contain in their composition chromium and manganese oxide respectively in proportions of less than 15% and 10% and preferably in proportions of less than 10% and 5%. 8. Acier selon la revendication 1, caractérisé en ce que les inclusions peuvent être entourées, en faible proportion, d'une phase composée de Athos, Si02, CaO. 8. Steel according to claim 1, characterized in that the inclusions can be surrounded, in small proportion, by a phase composed of Athos, Si02, CaO.
FR0016355A 2000-12-15 2000-12-15 STAINLESS STEEL FOR SEVERE SHAPING AND IN PARTICULAR DEEP DRAWING OF A SHEET Expired - Fee Related FR2818289B1 (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0738783A1 (en) * 1995-04-21 1996-10-23 UGINE SAVOIE (société anonyme) Stainless austenitic steel suitable for the manufacture of wires
EP0859064A1 (en) * 1997-02-18 1998-08-19 UGINE SAVOIE (société anonyme) Stainless steel for manufacturing drawn wire, especially tyre reinforcement wire, and process of manutacturing said wire
EP0924313A1 (en) * 1997-12-19 1999-06-23 Armco Inc. Non-ridging ferritic chromium alloyed steel
EP0947591A1 (en) * 1998-03-18 1999-10-06 Ugine-Savoie Imphy Stainless austenitic steel suitable for the manufacture of wires
JP2000001756A (en) * 1998-06-18 2000-01-07 Kawasaki Steel Corp Ferritic stainless steel good in surface property and excellent in corrosion resistance and forming workability
JP2000001757A (en) * 1998-06-18 2000-01-07 Kawasaki Steel Corp Ferritic stainless steel good in surface property and excellent in corrosion resistance, forming workability and ridging resistance
JP2000001759A (en) * 1998-06-18 2000-01-07 Kawasaki Steel Corp Austenitic stainless steel good in surface property and excellent in corrosion resistance
JP2000001758A (en) * 1998-06-18 2000-01-07 Kawasaki Steel Corp Ferritic stainless steel good in surface property and excellent in corrosion resistance and forming workability

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0738783A1 (en) * 1995-04-21 1996-10-23 UGINE SAVOIE (société anonyme) Stainless austenitic steel suitable for the manufacture of wires
EP0859064A1 (en) * 1997-02-18 1998-08-19 UGINE SAVOIE (société anonyme) Stainless steel for manufacturing drawn wire, especially tyre reinforcement wire, and process of manutacturing said wire
EP0924313A1 (en) * 1997-12-19 1999-06-23 Armco Inc. Non-ridging ferritic chromium alloyed steel
EP0947591A1 (en) * 1998-03-18 1999-10-06 Ugine-Savoie Imphy Stainless austenitic steel suitable for the manufacture of wires
JP2000001756A (en) * 1998-06-18 2000-01-07 Kawasaki Steel Corp Ferritic stainless steel good in surface property and excellent in corrosion resistance and forming workability
JP2000001757A (en) * 1998-06-18 2000-01-07 Kawasaki Steel Corp Ferritic stainless steel good in surface property and excellent in corrosion resistance, forming workability and ridging resistance
JP2000001759A (en) * 1998-06-18 2000-01-07 Kawasaki Steel Corp Austenitic stainless steel good in surface property and excellent in corrosion resistance
JP2000001758A (en) * 1998-06-18 2000-01-07 Kawasaki Steel Corp Ferritic stainless steel good in surface property and excellent in corrosion resistance and forming workability

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 04 31 August 2000 (2000-08-31) *

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