Abstract: The present invention aims to produce a cold rolled metal coated multi-phase steel, characterized by a tensile strength of at least 500 MPa, a yield ratio (Re/Rm) lower than 0.65 in skinned conditions, lower than 0.60 in unskinned conditions, and with good metal coating adhesion behavior. In the case of the aluminized steel according to the invention, the steel also has superior resistance to temperature corrosion up to 900° C. and excellent mechanical properties at this high temperature. The hot metal coated steel product having a steel composition with a manganese content lower than 1.5%, chrome content between 0.2 and 0.5%, molybdenum content between 0.1 and 0.25%, and a relation between the chrome and molybdenum content as follows Cr+2 Mo higher than or equal to 0.7%, undergoes a thermal treatment in the hot dip metal coating line defined by a soaking temperature between Ac1 and Ac3, a primary cooling speed higher than 25° C./sec and a secondary cooling speed higher than 4° C./sec.

Abstract: The present invention describes an ultra-low carbon bake hardenable galvanized or galvannealed steel product, having a higher yield strength at the temperature of the molten zinc bath while maintaining a low yield strength and excellent bake hardening properties in a skinpassed condition, BH0 being higher than 35 MPa and BH2 higher than 40 MPa (GI) and BH0>20 MPa and BH2>30 MPa (GA), as well as having a superior paint appearance after stamping and painting. The content in the steel composition of the Ti is comprised between 3.42 N and 3.42 N+60 ppm for a fixed nitrogen content (N), and the Nb-content, comprised between 50 ppm and 100 ppm, is fixed so that no substantial precipitation of niobium carbides will occur during the process.

Abstract: A method for the reduction of metallic oxides and a rotating-hearth furnace. The method is for the reduction of metallic oxides in a furnace with a ring-shaped rotating hearth in which a carbonaceous reducing agent and metallic oxides are deposited in a strip on a part of the rotating hearth and are then transported in a roughly helical movement to a discharge device. The reducing agent is preheated and mixed with the preheated metallic oxides before and/or during their deposition on the rotating hearth. In a first reducing stage, the volatile components of the carbonaceous reducing agent (mainly methane and hydrogen) are used to initiate the reduction of the metallic oxides and, in a second reducing stage, carbon monoxide is used. The rotating-hearth furnace is subdivided into a charging zone, at least one intermediate zone adjacent to the charging zone, and a discharge zone adjacent to the intermediate zone.

Abstract: A method for improving the direct reduction of metal oxides in a continuous furnace with a rotating hearth. The method deposits two or several layers with increasing metal oxide contents in each layer towards a top loading surface and decreases carbon contents towards the top loading surface, which carbon will be preheated to a temperature of the order of 200° C. while the metal oxides will be preheated to a temperature of 800° C. The furnace is provided with equipment producing at the loading surface triangular grooves and in first and second zones of the furnace matching equipment with double action.

Abstract: An apparatus for producing liquid pig iron, including an iron oxide reducing furnace, a melting furnace positioned to receive and melt iron oxides reduced in the reducing furnace, a pig iron discharge device associated with the melting furnace, a slag discharge device associated with the melting furnace, at least one supply pipe connecting the reducing furnace and the melting furnace such that a mixture of metallized iron from the reducing furnace may be transferred to the melting furnace under gravity, and at least one discharge pipe connected to discharge combustion gases from the melting furnace to the reducing furnace, wherein the at least one supply pipe is provided with a plurality of regulating flap valves configured to allow sufficiently large accumulation of a mass of the mixture of metallized iron and to pour the mixture of metallized iron from a certain height such that the mixture of metallized iron being poured penetrates the pig iron in a molten phase forcefully.

Abstract: The oscillating table comprises a movable part on which a mould of a continuous casting machine is located. The movable part is coupled via eccentrics to a driving mechanism for introducing an upward and downward oscillation motion in order to prevent the cast steel from remaining stuck to the wall of the mould. In contradistinction to the known oscillating tables according to the invention the eccentrics are not uniformly driven. To this end the driving mechanism comprises driving means for driving the eccentrics with a non-uniform angular speed. In a preferred embodiment the driving means comprise hydraulic motors provided with a control system. The hydraulic motors are electronically synchronised and as a safeguard being coupled to each other by a synchronisation shaft. In this way the facility is obtained to operate any lifting and descending motion of the casting mould.

Abstract: Method of producing metal sheets or strips by rolling a metal sheet or strip through cold rolling mills, characterized in that at least two work rolls (2) are textured according to a surface pattern consisting in a regular deterministic bidimensional patter in the form of unit cells of spots, said spot being obtained through an electron beam irradiation (12) and in that the wavelengths in the longitudinal direction ?.lambda..sub.L ! of the rolls and in the transverse direction ?.lambda..sub.L ! of the rolls are less than 1.5 mm.

Abstract: Method of producing metal sheets or strips by cold reduction rolling of a metal sheet or strip with at least one pair of work rolls, at least one of which being a textured work roll in order to transfer the surface pattern of the textured work roll to the surface of said sheet or strip, characterized in that said pattern of the textured work roll consists in a bidimensional deterministic pattern of spots wherein each spot has the form of a crater with a rim around it.

Abstract: Side guides intended for rolling mills in the metallurgical industry characterized in that these side-guides are divided in a succession of segments which are placed in an alternation of a first segment (11) of a substantially rectangular shape and having a width allowing its insertion between two successive rollers (2) and of a second segment (12) intended to be placed above a corresponding roller (2) of which the lower end is of substantially semicircular shape.

Abstract: A process for feeding a second stream of pulverulent materials into a pneumatic conveying line carrying a first controllable flow of pulverulent materials is presented. The second stream of pulverulent materials is fed at a controlled rate and the control of the first flow is rendered insensitive to disturbances caused by the feeding of the second stream by directly or indirectly controlling the first flow upstream of the injection point of the second stream.

Abstract: An apparatus for producing surface structures on a drum with an electron beam, comprising beam equipment having a beam generator that generates the electron beam, a focal length adjustment as well as a focusing adjustment, and a vacuum chamber which accepts the roller, the beam equipment comprising a passage for the electron beam in a wall that separates the beam equipment from the vacuum chamber, the passage being fashioned as a nozzle having a nozzle jacket whose inside diameter is selected such that the electron beam defocused with the focusing adjustment charges at least a part of the nozzle jacket in a cleaning interval, the nozzle jacket comprising a nozzle base secured in the wall and an end segment that projects beyond the wall in a direction toward the vacuum chamber, and a taper connecting said end segment to the nozzle base, the taper being radially limited by a channel, and a method of operating such an apparatus.

Abstract: A process is provided for treating exhaust gases to remove sulfur dioxide by contacting the gas with a solution of ammonium sulfite and bisulfite in a scrubber. A portion of the solution discharged from the scrubber is oxidized to form ammonium sulfate and the treated gas is further treated with the oxidized solution.