Abstract: A process for adjusting the composition of a liquid metal, such as steel, is provided wherein liquid metal is sucked up from a start receptacle into a reactor which is at a reduced pressure with respect to the start receptacle. First, the liquid metal is made to flow inside the reactor under conditions close to plug flow where it undergoes a metallurgical treatment. Next, after the liquid metal has been conveyed through the reactor it is completely discharged into a finish receptacle which is also at a reduced pressure with respect to the reactor. To insure thorough mixing, the reactor is divided into a plurality of cells, each of which has its own independent gas injector for agitating the liquid metal therein.

Abstract: An electrogalvanizing process, in which a strip is moved past an anode, plating solution is made to flow at a speed V with respect to the moving strip, and an electric current of current density J greater than 50 A/dm.sup.2 is passed between the strip and the anode, which comprises carrying out the deposition under conditions such that:J/J.sub.lim is less than or equal to 0.15;J.sup.2 /J.sub.lim is less than or equal to 22 A/dm.sup.2 ;where J.sub.lim is the limiting current density, corresponding to the current density plateau in the current versus potential curve characteristic of the plating solution flowing at the speed V in the vicinity of the strip. An electroplating cell of the radial type for implementing the process, in which cell the anode bed is continuous, is disclosed. The process facilitates the high-speed deposition of zinc which has low rugosity and is free of edge dendrites.

Abstract: The subject of the invention is a hot-rolled steel sheet with high strength and high drawability, whose composition, expressed in percentages by weight, is:C.ltoreq.0.12%;0.5.ltoreq.Mn.ltoreq.1.5%;0.ltoreq.Si.ltoreq.0.3%;0.ltoreq.P.ltoreq.0.1%;0.ltoreq.S.ltoreq.0.05%;0.01.ltoreq.Al.ltoreq.0.1%;0.ltoreq.Cr.ltoreq.1%;0.01.ltoreq.Nb.ltoreq.0.1%;0.ltoreq.Ti.sub.eff .ltoreq.0.05%, Ti.sub.eff being the content of titanium not in the form of nitrides, sulfides or oxides; and whose structure comprises at least 75% of ferrite hardened by precipitation of niobium or niobium and titanium carbides or carbonitrides, the remainder of the structure comprising at least 10% of martensite and possibly bainite and residual austenite. The subject of the invention is also processes for manufacturing such sheets.

Abstract: A steel strip and method for its production.

Abstract: The invention relates to a flush-mountable cooktop having a steel support table covered on its two faces by a layer of an electrically insulating material, which table has openings in which burners are fixedly flush-mounted to the table by mounting elements which provide a seal. The burners each include a support layer of steel coated on its two faces with an electrically insulating material, and an electrically conducting layer having electrically conductive buses or the like for connecting the burner to an external source of electrical energy.

Abstract: The subject of the invention is a method for regulating the level of the meniscus (13) of the liquid metal in a mold (5) of a machine for the continuous casting of metals, according to which method the electrical signals supplied by at least one pair of sensors (17, 18) overhanging said meniscus are picked up, said signals being a function of the respective distances (h.sub.1, h.sub.2) between said sensors and said meniscus, these two signals are combined so as to obtain a single signal representing an imaginary level of said meniscus and said signal is sent to means (15, 24) for controlling a device (14) for regulating the flow rate of metal penetrating the mold, so that said control means actuate said device so as to bring said imaginary level of said meniscus back to a predetermined set value (h), wherein each signal coming from said sensors is conditioned, eliminating therefrom the oscillations having both a frequency greater than a threshold (F) and an amplitude less than a threshold (D).

Abstract: The invention relates to a corrosion inhibitor for a metal material such as steel, of the type consisting of an aqueous solution containing an alkali metal nitrite, wherein said solution contains 0.01 to 0.3 mol/l of an alkali metal nitrite, 0.01 to 0.3 mol/l of an alkali metal phosphate, and phosphoric acid in a proportion of a quantity sufficient to maintain the pH of said solution, measured at ambient temperature, between 6.9 and 7.2.

Abstract: Both a method and apparatus for producing molten steel are provided wherein ferrous materials rich in carbonaceous materials are fused in a first vessel of a single electric furnace having separate first and second vessels. The carbonized molten metal thus obtained is then pretreated in a separate pretreatment facility to remove contaminants and the pretreated molten metal is then decarburized in the second vessel of the electric furnace. The decarburization of the pretreated metal in the second vessel of the furnace avoids reintroducing contaminants into the steel by avoiding contact between the pretreated metal and the slag produced when the initial carbonaceous materials are fused. Preferably, the first and second vessels are two vessels of a single electric furnace having a single electric power source.

Abstract: The subject of the invention is a method for coating a metallurgical product, especially a steel product, in which said product is dipped into a bath of metallic alloy containing solid impurities, wherein said bath of alloy is exposed to sound vibration so as to accelerate the decantation of said impurities.The subject of the invention is also an installation for coating metallurgical products (3), especially steel products, of the type comprising a tank (1) containing a bath (2) of metallic alloy and means (4, 5) for dipping said products (3) into said bath of alloy, wherein it also comprises means (13, 14) for exposing said bath of alloy to sound vibration.

Abstract: The invention relates to a device for the measurement of the thickness profile of a metal product in the form of a moving strip or a moving plate, of the type composed of an X-ray source emitting in the direction of the said product, an X-ray detection unit (21) located on the other side of the product with respect to the said source, means (22) for processing the signals emitted by the detection unit enabling the thickness profile of the said product to be measured, and means (23, 24) for cooling the detection unit and means for processing its signals, wherein the detection unit and the means for processing its signals are arranged on a support plate (18) fitted with a closure plate (19), the closure plate including electrical (27) and fluid (25, 26) connections necessary for the operation of the detection unit and of the means for processing its signals, in that the support plate is inserted into a box of which one of the side faces has an opening, means (20) for the attachment of the closure plate and mean

Abstract: The invention relates to a furnace (1) for melting metal-bearing substances and/or production of liquid metal (4) of the type in which said metal (4) has above it a layer of slag (5) liable to be affected by a "foaming" phenomenon, in which a side wall of said furnace comprises an orifice (17) opening into an adjacent tank (22) capped with a vault (25), said tank (22) being capable of collecting a proportion of said slag (5) by overflowing through said orifice (17) when said foaming phenomenon takes on proportions that risk causing damage to said furnace (1).The invention also relates to a process for the production of liquid metal employing such a furnace.

Abstract: The device of the invention calibrates an apparatus for measuring the thickness profile of flat products, for example metal sheets, of the type which includes a source (10) of radiation, for example an X-ray source, and a row (20) of elementary detectors (21) which are aligned along the direction (P) of the profile to be measured and are placed on either side of a zone (2) for passage of said product. The device includes a set (32) of shims (33) having different radiation absorption characteristics, a carriage (30) for supporting the shims which is movable along the direction (P). For the calibration, the set of shims is moved in the passage zone so that each shim may intercept the radiation emitted by the source in the direction of each detector.

Abstract: The subject of the invention is a process of continuous coating, with a polymer deposition, of a metallic material in motion inside a chamber under a reduced pressure, in which process the monomer of the said polymer is injected, in the gaseous state, into the said chamber and the conditions for forming a cold plasma are created so as to cause coating of the said material with the said polymer deposition, which comprises, in at least one region of the said chamber, the said material being made to pass through a magnetic field so as to cause a variation in the composition of the said polymer deposition in the said region. The subject of the invention is also a device for the implementation of this process, and a product obtained thereby.

Abstract: The lid for a sealed container openable along a line of reduced strength merely by exerting a pull is of the type comprising a substantially right-angles fold (4) constituting a line of reduced strength which is formed by a stamping operation on a sheet of steel having a thickness less than or equal to 0.16 mm. The line of reduced thickness permits the complete or partial opening of the container. The lid is preferably composed of 0.10 to 0.16 mm thick steel and, at the fold (4), the inside radius of curvature of the lid is 10 to 50 .mu.m and the outside radius of curvature of the lid is 100 to 200 .mu.m. The invention is applicable to sealed metal containers, such as food beverage cans or trays for pre-cooked dishes.

Abstract: In order to supply and control the deposit, on the surface of the metal bath of a continuous casting mold, of an evenly distributed layer, of predetermined thickness, of a powdery or granulated material, by way of a supply conduit whose end portion is provided with a delivery nozzle situated above the surface of said metal bath. The delivery nozzle is situated above the surface of the metal bath, at a height equal to or slightly more than the predetermined thickness, the said delivery nozzle is permanently open, and the end portion of the supply conduit is permanently supplied with the said material.