Institut De Recherches De La Siderurgie Francaise

Institut De Recherches De La Siderurgie Francaise (irsid)

Usinor Sacilor

Usinor

Thyssen Edelstahlwerke Ag

Thyssen Stahl Aktien-gesellschaft

Jean-Pierre Birat

Robert Alberny

Jacques M Spiquel

Roger Ventavoli

Jean-Luc Jacquot

Michel Faral

Louis Vedda

Philippe Blin

Laurent Sosin

Herve Tavernier

Christophe Ganser

Nicolas Guelton

Michel Larrecq

Catherine Juckum

Paul Victor Riboud

Alain Leclercq

Jacques Ruer

Yves Grandgenevre

Jean-Bernard Veyret

Michel Larrece

Bernard Trentini

Denis Tromp

Denis Senaneuch

Patrick Neu

Cosimo Salaris

Jean-Louis Leclaire

The invention relates to a method for producing a siderurgical product made of carbon steel having a high copper content, according to which: &#x2014;a liquid steel having the composition: 0.0005%&#x2266;1%; 0.5&#x2266;Cu&#x2266;10%; 0&#x2266;Mn&#x2266;2%; 0&#x2266;Si&#x2266;5% 0&#x2266;Ti&#x2266;0.5%; 0&#x2266;Nb&#x2266;0.5%; 0&#x2266;Ni&#x2266;5%; 0&#x2266;Al&#x2266;2%, the remainder being iron and impurities, is produced;&#x2014;said liquid steel is poured directly in the form of a thin strip having a thickness of no more than 10 mm;&#x2014;the strip is subjected to forced cooling and/or is surrounded by a non-oxidizing atmosphere while having a temperature of more than 1000? C.; &#x2014;said thin strip is hot rolled at a reduction rate of at least 10%, the temperature at the end of the rolling process being such that all of the copper is still in a solid solution in the ferrite and/or austenite matrix;&#x2014;and the strip is coiled. The invention also relates to a siderurgical product obtained according to said method.

Method for the production of a siderurgical product made of carbon steel with a high copper content

Installation for continuous casting between two rolls (1,2) having parallel axes and defining therebetween and with two fixed lateral walls (3) a casting space for a liquid metal, each lateral wall comprising at least one lateral part (6) placed against the planar end face of an adjacent one of the rolls and constituted by a portion of a disc having an outside diameter equal to that of the adjacent roll, and a part (12) which is central relative to and confronts the casting space and is composed of an insulating refractory material. The disc portion is made from a material having properties of thermal conductivity and mechanical resistance superior to those of the refractory material and is a frustoconical disc portion whose face having the larger radius of curvature is placed against the adjacent roll and the disc portion defines a frustoconical surface which is in contact with the insulating material of the central part. The invention is applicable to the continuous casting of thin metallic products, in particular of steel.

Installation for continuous casting between rolls

A device for casting thin metal products by solidifying the molten metal on the cooled lateral surfaces of two parallel horizontal rolls rotating in opposite directions, in which the casting space between the rolls is closed laterally by side dams each comprising an insert penetrating into the space between the rolls. A consumable or deformable material is provided between the rolls and the insert to provide a fluid-tight seal joint between the lateral faces of the inserts and the ends of the opposite rolls. The seal changes shaped by being consumed or deformed to maintain the fluid-tight seal as the rolls expand due to contact with the molten metal.

Device for the continuous casting of thin metal products between two

A closing wall for the lateral end of a casting space of an installation for continuously casting between moving walls which comprises two confronting cooled moving walls (1,2). The closing wall comprises a front part (65) defining a front surface (63) facing toward the casting space and at least one lateral part (66) defining a lateral surface (64) in the extension of the surface of one of the two moving walls and connected to said front surface. The invention is also applicable to the continuous casting of thin metal products between rolls.

Lateral closing wall for an installation for continuously casting

In a continuous-casting method molten steel is continuously introduced into a continuous-casting mold to form therein a strand having a free surface in the mold, a pair of relatively wide faces, and a pair of relatively narrow faces. The mold and the steel therein are continuously cooled to externally solidify the molten-steel strand while leaving same internally molten and the externally solid and internally molten strand is continuously withdrawn from the lower end of the mold. The core of the strand solidifies increasingly as it moves from the mold and terminates downstream of the mold at a pool bottom. At each of a plurality of locations spaced apart about 1 m to 2 m longitudinally along the strand between the mold and the pool bottom a respective magnetic field is formed with the fields passing through the strand from between about 3 m to 7 m beneath the free surface to about 2 m to 6 m from the pool bottom. These fields are displaced transversely of and generally parallel to the side faces of the strand with each field moving opposite to the adjacent field or fields so as to magnetically transversely and oppositely displace respective portions of the molten core of the strand.

Electromagnetically stirring the melt in a continuous-casting mold

In regulating the flow of cooling water sprayed upon a metallurgical product such as a steel slab in a machine for the continuous casting of such products which then undergo a straightening operation, the present, past and future speeds of the product are taken into account so as to compensate a projected change in the temperature of the product in the straightening stage, due to a planned or expected modification of the cooling conditions. These conditions are established by a regulating system responsive to changes in the speed of the product; the anticipated temperature change is compensated by substituting for the true speed, as a controlling parameter, a fictitious speed lying between the true speed and an advance image of an anticipated speed change whose effects upon the temperature are to be neutralized.

Process for adjusting the secondary-cooling rate of a continuous-casting

A cooling jacket for an ingot mold for the continuous casting of metal comprises a tubular element and a grid of stiffening ribs projecting from the outer surface of the tubular element, in which the grid is provided at the intersection of the stiffening ribs with openings or bores which pass also through the tubular element for the passage of fastening elements in form of tie rods therethrough by which an inner tube for the passage of the metal to be cast can be fastened to the cooling jacket with radial clearance. The upright ingot mold in which the cooling jacket is used and which is especially employed for the casting of steel, includes, besides the cooling jacket and the inner tube, an outer shell surrounding the cooling jacket with considerable clearance. The outer shell is closed by plates at opposite ends to which opposite ends of the inner tube are respectively fastened and these plates are provided with openings aligned with the opposite open ends of the inner tube. The space between the tubular element of the cooling jacket and the outer shell is divided by a transverse wall in a lower chamber with which the open lower end of the tubular element of the cooling jacket communicates and a longer upper chamber with which the open upper end of the tubular element communicates. A cooling water inlet communicates with the lower chamber adjacent the separating wall and a cooling water outlet communicates with the upper compartment at the other side and adjacent to the separating wall. A polyphase magnetic inductor is located in the upper compartment around the cooling jacket.

Cooling jacket for an ingot mold for the continuous casting of metal and

A method of continuous centrifugally casting of metal strands of non-circular, preferably substantially square cross-section, in which the metal continuously passing through an ingot mold of corresponding cross-section is rotated about the longitudinal axis of the mold by means of a rotating magnetic field which may be created by a stationary multi-phase inductor, and wherein the metal in the mold is continuously replenished by a jet of liquid metal impinging on the free surface of the metal in the mold at a point of impact in the neighborhood of one corner of the mold, preferably at a point located on the diagonal substantially midway between the mold wall and the center of the mold. This method causes any slack contained in the metal to concentrate at the center of the free upper metal surface in the mold, from where it can be easily removed.

Method of continuous centrifugally casting of metal strands of

A molten metal is poured into the upper end of a vertically tubular continuous-casting mold and is withdrawn as a hardened casting from the lower end of the mold. An electromagnetic field is displaced upwardly counter-current to the descending metal so as to mix the molten part of the metal and displace non-magnetic inclusions away from the hardening skin of the metal. The mold is operated in accordance with the following formula:

Method of and apparatus for electromagnetic mixing of metal during

A method of continuous centrifugal casting of metal products in which molten metal is rotated during the passage through an elongated cooled ingot mold about the axis of the latter and in which the still liquid core of the partly solidified casting as it leaves the ingot mold is subjected to forces counteracting the rotation of the still liquid core of the casting.

Method and apparatus for continuous centrifugal casting of metal products

A metallic product free of surface faults is continuously cast in a cooled, conductive ingot mold wherein a liquid metal is rotated by applying a magnetic field turning about the axis of the mold thereto and wherefrom the partially solidified metal product is extracted continuously. The driving action of the magnetic field is optimized by imparting to it a maximum value of frequency of rotation between 4 and 15 Hertz, this value being a function of the form and size of the cast product as well as the thickness and electric conductivity of the mold wall such that any increase in the frequency of rotation above this value brings about an attenuation of the frequency in the mold wall in excess of its positive effect on the rotation of the liquid metal.

Continuous casting of a metallic product by electromagnetic centrifuging

A method for continuously casting metal in horizontal direction in which molten metal is continuously discharged from a container through a conduit of refractory material into a horizontally-extending cooled ingot mold axially aligned with the conduit. The flow passage formed by the conduit and the ingot mold increases abruptly at the junction of the conduit and the ingot mold. The outer periphery zone of the stream of molten metal passing through the conduit is accelerated by electromagnetic force so as to enter into the ingot mold in such a manner as to create immediately downstream of the junction an annular space free of metal; and an apparatus for carrying out the method.

Method and apparatus for continuously casting of metal in horizontal

A method of continuously casting metal in which the metal is subjected during its solidification at a predetermined zone to the action of a magnetic field which is controlled as a function of the withdrawal speed of the metal during the continuous casting thereof to maintain in the region of the solidification of the metal a magnetic pressure between two predetermined limits to thereby agitate the metal during its solidification to improve the structure of the cast product especially in a central axial zone of the product.

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Semecourt, France

Jean-Pierre Birat