Abstract: In order to cool a metal strip (2) which moves in a continuous manner: the strip (2) is pressed onto a main cooling roller (10) so that the strip forms an arc whose inner face delimits, with the outer face of this roller, a contact zone which is suitable for discharging part of the heat of the strip towards the inner side of the roller, the strip (2) is held in contact with the main cooling roller (10) by means of a support roller (14) on the outer face of the strip, which roller is constituted by a resiliently deformable and thermo-capacitive material, and the heat transmitted from the strip (2) to the support roller (14) is discharged using secondary cooling means (16).

Abstract: The invention concerns a method for making an abrasion-resistant steel part consisting of 0.1%?C?0.23%; 0%?Si?2%; 0%?AI?2%; 0.5%?Si+AI?2%; 0%?Mn?2.5%; 0%?Ni?5%; 0%?Cr?5%; 0%?Mo?1%; 0%?W?2%; 0.05%?Mo+W/2?1%; 0%?B?0.02%; 0%?Ti?0.67%; 0%?Zr?1.34%; 0.05%?Ti+Zr/2?0.67%; 0%?S?0.15%; N<0.030, optionally 0% to 1.5% of Cu; optionally Nb, Ta and V such that Nb/2+Ta/4+V?0.5 %; optionally Se, Te, Ca, Bi, Pb contents ?0.1%; the rest being iron and impurities. Additionally: 0.095%?C*=C?Ti/4?Zr/8+7×N/8, Ti+Zr/2?7×N/2?0.05% and 1.05×Mn+0.54×Ni+0.5O×Cr+0.3×(Mo++W1/2)1/2+K>1.8, with K=1 if B?0.0005% and K=0 if B<0.0005%. After austenitization, the method consists in: cooling at a speed >0.5° C./s between AC3 and T=800?270×C*?90×Mn?37×Ni?70×Cr?83×(Mo+W/2) and about T?50° C.; then cooling at a speed 0.1<Vr<150×ep?1.7 between T and 100° C., (ep=thickness of plate in mm); cooling down to room temperature and optionally planishing. The invention also concerns the resulting plate.

Abstract: The invention relates to a tool steel, the composition of which comprises (the percentages being expressed in % by weight): 0.8 ? C ? 1.5 5.0 ? Cr ? 14 0.2 ? Mn ? 3 Ni ? 5 V ? 1 Nb ? 0.1 Si + Al ? 2 Cu ? 1 S ? 0.3 Ca ? 0.1 Se ? 0.1 Te ? 0.1 1.0 ? Mo + ½W ? 4 0.06 ? Ti + ½Zr ? 0.15 0.004 ? N ? 0.02 the balance of the composition consisting of iron and impurities resulting from the smelting, it being furthermore understood that: 2.5×10?4%2?(Ti+½Zr)×N, to a process for manufacturing parts made in this steel and to the parts obtained.

Abstract: The invention relates to a method for producing a siderurgical product made of carbon steel having a high copper content, according to which: —a liquid steel having the composition: 0.0005%?1%; 0.5?Cu?10%; 0?Mn?2%; 0?Si?5% 0?Ti?0.5%; 0?Nb?0.5%; 0?Ni?5%; 0?Al?2%, the remainder being iron and impurities, is produced;—said liquid steel is poured directly in the form of a thin strip having a thickness of no more than 10 mm;—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.; —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;—and the strip is coiled. The invention also relates to a siderurgical product obtained according to said method.

Abstract: The invention relates to a high-resistant, low-density hot laminated sheet steel comprising the following elements expressed in weight per cent: 0.04%:9 carbon?0.5%; 0.05%?manganese?3%, being able to contain hardening elements: 0.01%?niobium?0.1 0.01%?titanium?0.2% 0.01?vanadium?0.2%, either individually or combined, and/or elements acting on the transformation temperatures, 0.0005%?boron?0.005%; 0.05%?nickel?2%; 0.05%?chrome?2%; 0.05%?molybdenum?2%, either individually or combined, the remainder being iron and elements which are inherent to production, characterized in that it comprises: 2%?silicon?10%; 1%?aluminium?10%. The invention also relates to the production thereof.

Abstract: A metallurgical product, made of carbon steel and to be galvanized, which is in the form of a strip or of a sheet obtained from a continuously cast intermediate product having the following composition by weight: 0.0005%?C?0.15%; 0.08%?Mn?2%; Si?0.040%; Altotal?0.010%; Alsoluable?0.004%; 0.0050%?Ototal?0.0500%; P?0.20%; S?0.10%; each of Cu, Cr, Ni, Mo, W, Co?1%; each of Ti, Nb, V, Zr?0.5%; each of Sn, Sb, As?0.1%; B?0.1%; N?0.0400%; and the remainder being iron and impurities. Also, a process for obtaining a metallurgical intermediate product, which includes: producing in a ladle a liquid steel the composition of which is as above, and in which the dissolved oxygen content is maintained between 0.0050 and 0.0500% by the establishment of a chemical equilibrium between the metal and the ladle slag; and casting the steel on a continuous casting machine.

Abstract: A steel having a composition, expressed in wt. %, of: 0.03?C?0.06; 0.50?Mn?1.10; 0.08?Si?0.20; 0.015?Al?0.070; N?0.007; Ni?0.040; Cu?0.040; P?0.035; S?0.015; Mo?0.008; Ti?0.005; and boron in an amount such that: 0.65?B/N?1.60, the rest of the composition consisting of iron and impurities resulting from preparation. Also a method for making steel plates having this composition, and the resulting plates, produced by the method.

Abstract: To measure the characteristics of the surface coating of a moving metal strip, such as the alliation level of a coating including zinc and iron, the product is exposed to the radiation of a radiative source with a predetermined wavelength directed orthogonally to the surface of the product and the energy reflected by the surface is measured also in a direction orthogonal to the surface so as to overcome reflectivity variations due to the morphological characteristics of the surface and these operations are performed with the help of off-the-shelf optical fibres previously stripped at their free ends of their normal optical focusing accessories so that they can be brought as near to each other as possible and placed parallel to each other.

Abstract: A device for calibrating a multi-roll leveler for leveling a metal strip includes an assembly having two series of rolls, namely upper rolls and lower rolls which face each other so as to imbricate the rolls of one series into those of the other. The series of rolls are placed substantially parallel to each other and perpendicular to the run direction of the strip to be leveled. A rigid measurement bar of sufficient length is positioned in the leveling direction between the upper and lower rolls, extending over all the rolls, and having rigid protrusions integral with the bar reproducing, when they are placed plumb with the lower rolls, the action of the lower rolls and their mechanical properties. A thin metal plate rests on these protrusions and is fastened to one of them at around the middle of the bar and includes extensometers for measuring its elastic deformations.

Abstract: In order to cool a metal strip (2) which moves in a continuous manner: the strip (2) is pressed onto a main cooling roller (10) so that the strip forms an arc whose inner face delimits, with the outer face of this roller, a contact zone which is suitable for discharging part of the heat of the strip towards the inner side of the roller, the strip (2) is held in contact with the main cooling roller (10) by means of a support roller (14) on the outer face of the strip, which roller is constituted by a resiliently deformable and thermo-capacitive material, and the heat transmitted from the strip (2) to the support roller (14) is discharged using secondary cooling means (16).

Abstract: The present invention relates to a cooling device for a quenching operation during the continuous annealing treatment of a flat product in the form of a metal strip (2), preferably a steel strip, said device: being located in an essentially vertical, ascending or descending path; comprising an overflow weir (4) in which a series of tubes (1) are completely immersed and stacked more or less vertically and symmetrically along each side of the strip (2) and which each eject onto the strip a cooling fluid in the form of essentially horizontal turbulent jets through a slit or a series of holes; being provided in its lower part with a sealing means (3); characterised in that any two successive tubes (1) located on a same side of the strip (2) are separated by a gap (B) that is identical for all tubes (1), chosen at a given value of specific flow rate of the cooling fluid, expressed in cubic metres per hour and per m2 of a surface of the strip so as to minimise the loss of flow in the evacuation passages corres

Abstract: The invention relates to a sealing lock, for an in vacuo chamber for deposition on a, preferably metallic, endless strip, characterised in that: the metal rollers are mounted on brackets, fixed to the covers and are immovable like the latter, the rollers of the same pair have the axes thereof arranged in the same vertical plane and are of different diameter, the position of the roller with the smaller diameter being alternated up and down on passing from a given pair to the next pair, the support cradles for the two rollers of the same pair have a lateral projection towards the centre, the spacing of which with regard to the base for said rollers defines a second gap.

Abstract: A method for controlling and driving a technical process executed in time by applying at each time t instructions Ci(t), leading to a measurable but not observable result R(t) and generating a plurality of observable quantities distinct from the result R(t) whereof at least two are independent Gj(t), which consists in: measuring at least two independent observable quantities Gj(t), Gp(t); with a predictive model M, or a set of models, whereof the variables comprise the at least two independent observable quantities, calculating an estimation Res(t)=M(G1(t), Gp(t) of the result R(t); using a drive law L, whereof the input variable is the estimated result Res(t) calculating new instructions Ci(t+1), applicable for time t+1; and replacing the instructions [C1(t), Cn(t)] by the instructions [C1(t), Cn(t+1)]. The method for controlling and driving a technical process is applicable to spot welding.

Abstract: The invention relates to ultrahigh strength hot-rolled steel having a chemical composition consisting of, by weight: 0.05%=C=0.1%, 0.7%=Mn=1.1%, 0.5%=Cr=1%, 0.05%=Si=0.3%, 0.05=Ti=0.1%, Al=0.07, S=0.03%, P=0.05, the remainder comprising iron and impurities resulting from the production thereof. Moreover, the inventive steel has a bainitic-martensitic structure which can contain up to 5% ferrite. The invention also relates to a method of producing bands of said steel.

Abstract: The present invention is related to a method for the production of metal coated steel products, comprising the steps of: providing a steel product with a metal coating; adding an additional metallic element to said coating; subjecting said product to a thermal treatment, characterized in that: prior to the addition of said additional element, said product is subjected to a plasma treatment via a dielectric barrier discharge, for cleaning and activating the surface of said coating; said additional element is added through a physical vapour deposition technique; said thermal treatment is applied by directing high energy infra red radiation towards the outer surface of said coating.

Abstract: The present invention is related to a steel composition intended to be used in a process including a cold rolling step, for the production of uncoated, electro-galvanized or hot dip galvanized TRIP steel products, the composition being characterized by a specific addition of phosphorus. The latter is added in order to reach the desired mechanical properties (high tensile strength in combination with high elongation) while keeping a good weldability by sufficiently reducing the carbon content. The invention is further related to a process for producing a steel product, and to the steel product obtained, said product having the composition of the invention.

Abstract: A continuous casting installation for metals comprises a submerged nozzle surrounded by an annular electromagnet inductor with a magnetic field that rotates around the casting axis, and which drives the molten metal in an axial rotation. The inductor is a polyphase type with a magnetic field passing therethrough and is equipped with a pair of projecting poles (3) per phase. The end of each projecting pole opposite the nozzle is provided with a lateral narrowing which increases the distance separating the polar ends.

Abstract: The invention concerns a method for adjusting a flattener under traction and a corresponding device, for providing a metal strip (5) in particular a cold-rolled steel plate, comprising a cage (1), cage posts (8), two stacked cassettes (2, 3) supporting each a plurality of rollers (4) between which the metal strip (5) is fed. The invention is characterized in that it consists in measuring a physical quantity representing the angular position of said cassettes (2, 3) relative to the feeding direction of the said trip (5).

Abstract: The invention concerns a method for pointing a fine fluid jet onto a zone or an object in particular in welding, machining, or laser hardfacing, the jet being emitted from a blowing nozzle (5), the nozzle comprising an exhaust channel (10) including a terminal portion (11) of substantially circular cross-section having a diameter not greater than 5 mm, a light source (3) arranged in the axis of the discharge channel (10) upstream of the nozzle (5) in the flow direction of the fluid flux, generating a non-divergent mono- or polychromatic light beam whereof at least one wavelength ranges between 400 and 760 nanometers, coaxial with the exhaust channel (10) and propagated inside the channel in the flow direction of the fluid, whereby, the fluid flow being momentarily interrupted, by relative displacement of the object or zone or the light beam, the light beam is pointed on the object or the zone and the fine fluid jet is projected onto the zone or object.

Abstract: A device used to control the quality of an operation involving laser beam welding, hardfacing, or machining of a part. The device includes at least one gas blow nozzle including an exhaust duct used to release a stream of the gas and at least one photo-sensitive sensor disposed behind the exhaust duct. A method controls an operation involving the laser welding, hardfacing, or machining of a part.