Abstract: A process for producing pig iron or liquid primary steel products in a smelting unit (1), in particular a melter gasifier. Iron-ore-containing charge materials, and possibly additions, are at least partially reduced in at least one reduction unit (R1, R2, R3, R4) by means of a reducing gas. A first fraction of the at least partially reduced charge materials is melted down in the smelting unit (1), while carbon carriers and oxygen-containing gas are supplied, with the simultaneous formation of the reducing gas. The reducing gas is fed to the reduction unit (R1, R2, R3, R4) and, after the reducing gas has passed through the reduction unit, it is drawn off as top gas. A second fraction of the at least partially reduced charge materials is fed to a smelting reduction unit for reducing and smelting.

Abstract: A process for producing agglomerates from fine-grained iron carriers and at least one binder as a charge material for a metallurgical process is shown. In at least one further agglomeration step, the agglomerates are coated with a layer, comprising iron carriers and at least one binder, and heated in such a way that the binder is cured in the region of the surface of the agglomerates. In a process for producing liquid pig iron or liquid primary steel products from charge materials and possibly additions and agglomerates, the agglomerates are preheated in a reducing zone, which has a preheating stage, in such a way that the agglomerates completely harden in the preheating stage.

Abstract: A device for guiding a strip through a liquid contained in a tank, includes an immersed diverting roller, in particular a roller immersed in a bath of liquid metal such as zinc, mounted rotatably about an axis on two aligned supporting shafts extending through two respective side walls of the tank, and each rotating in a centering bearing positioned outside of the tank. Each bearing of one shaft of the roller includes two rotary supporting members mounted in a fixed housing and spaced apart from each other, namely an outer supporting member and an inner supporting member. The housing of the bearing is held against a support plane formed on the wall and perpendicular to the axis of a hole through which the shaft passes. The wall has measures for centering the housing on the axis.

Abstract: A process for producing pig iron or liquid primary steel products in a smelting unit (1), in particular a melter gasifier. Iron-ore-containing charge materials, and possibly additions, are at least partially reduced in at least one reduction unit (R1, R2, R3, R4) by means of a reducing gas. A first fraction of the at least partially reduced charge materials is melted down in the smelting unit (1), while carbon carriers and oxygen-containing gas are supplied, with the simultaneous formation of the reducing gas. The reducing gas is fed to the reduction unit (R1, R2, R3, R4) and, after the reducing gas has passed through the reduction unit, it is drawn off as top gas. A second fraction of the at least partially reduced charge materials is fed to a smelting reduction unit for reducing and smelting.

Abstract: A method for guaranteeing the oxidation of a strip designed to prevent the selective oxidation of alloy elements of the steel in a continuous steel strip galvanizing annealing furnace having a pre-heating section and a hold section and provided only with radiant tubes. The oxidation of the strip is designed to prevent the selective oxidation of elements of the steel alloy. The novel method includes the following steps: installation of at least one modified tube capable of injection an oxidizing medium at least one point in the oven heating section and/or at least one point in the hold section and injection of the oxidizing medium by means of the modified tube(s), the oxidizing medium having a composition such that in the conditions of the temperature of the oxidizing medium and the steel strip and as a function of the chemical composition of the strip said medium has a dew point which guarantees an in-depth oxidation of the alloy elements of the steel strip.

Abstract: A disassembly apparatus and a method for changing at least one cylinder and/or a cluster of a laterally supported 6-high roll stand. The disassembly apparatus includes: a handling frame, including a positioning and moving device for moving and positioning same; a mobile shuttle capable of moving over the frame, wherein the shuttle includes an extraction device which can be moved by a moving member and which can disassemble the roll stand or assemble a cluster and/or a lateral supporting cylinder on it. The extraction device includes an upper crossbeam rigidly connected, via a movable strut, to a lower crossbeam. Each of the crossbeams have, at each of their ends, a movable gripping plate including at least one locking bolt. The gripping plates of a single crossbeam are configured to grip at least one cluster and/or at least one lateral supporting cylinder by actuating the locking bolt.

Abstract: In a method and an apparatus for separating at least one gaseous component from a waste gas of an installation for producing liquid pig iron, liquid primary steel products or sponge iron, in a first step, a stream of the waste gas passes through at least one adsorption separator at a first pressure, whereby the gaseous component is largely separated from the waste gas and, in a second step, the gaseous component is largely removed from the adsorption separator at a second pressure, which is lower than the first pressure. The method and apparatus are maintenance-free, cause low investment and energy costs and has a lower space requirement by a method in which the second pressure or the desorption pressure is generated by at least one jet pump, which is fed a stream of a propellant gas at a third pressure, which is higher than the second pressure.

Abstract: A metallurgical probe has a probe longitudinal axis and an open end face. The probe is fitted within a bearing point in such a manner that the open end face faces a predetermined insertion direction. The bearing point has probe centering elements to hold the probe in a predetermined probe position as seen transversely with respect to the probe longitudinal axis. A device inserts an end of the contact rod into a contact rod centering device, in an insertion direction running transversely with respect to the probe longitudinal axis, until the end of the contact rod is positioned, on account of the insertion into the contact rod centering device, in a predetermined contact rod position, in which the end of the contact rod is opposite the open end face. The contact rod is then moved in a direction of the probe longitudinal axis and is inserted into the probe.

Abstract: A method for operating a continuous annealing or galvanizing line for a metal strip, uses a direct flame heating section with an upstream zone and a downstream zone. The direct flame heating section is followed by a radiant tube heating section. The metal strip is indirectly heated in the direct flame heating section. The heating of the metal strip is achieved in the upstream zone by combustion of a mixture of atmospheric air and fuel such that the temperature of the combustion gas is between 1250° C. and 1500° C., preferably close to 1350° C. and in the downstream zone, the heating of the metal strip is achieved by combustion of a superoxygenated substoichiometric mixture of air and fuel such that the temperature of the combustion gas achieved at the end of the upstream zone is maintained until the end of the downstream zone of the direct flame heating section.

Abstract: The present invention relates to a process for improving energy supply when heating and melting a scrap bulk wherein a preheated oxidizing gas with addition of fossil fuels melts a channel into the scrap bulk and further energy supply occurs through this channel. A significant improvement of the process is achieved by supplying hot blast to the scrap bulk from the top.

Abstract: An injector insert pipe is arranged in the gas channel of a nozzle for injecting oxygen-containing gas into a pig iron production unit, wherein an interspace which surrounds the pipe is present over the entire pipe length between the wall of the gas channel and the pipe outer wall. The pipe extends at least as far as the nozzle end face which contains the mouth of the gas channel. The pipe space is connected to an oxygen-containing gas feed line, and the interspace is connected to a protective gas supply line. In a process, oxygen-containing gas is fed into the pipe space, which after it has flowed through the pipe, enters the production unit at an entry velocity, and the interspace is simultaneously flowed through by a gas which exits into the production unit at an exit velocity, wherein the entry velocity is greater than the exit velocity.

Abstract: A method and a device measure a chemical composition of a liquid metal suitable for coating a steel strip. The method measures a chemical composition of a liquid metal suitable for coating a steel strip for which the liquid metal is formed continuously in a first cavity, and the composition of the liquid metal is measured on a direct measurement surface thereof, for which a specimen of the liquid metal reaching the measurement surface is heated to a chosen temperature so as to isolate principally iron-based impurities from the measurement surface. Several embodiments of devices suitable for implementing the method are also presented.

Abstract: A method and a device adjust the cooling of a steel strip in an annealing or galvanization phase. The device is suitable for the forced cooling of a steel strip continuously running in a plant adapted for the continuous annealing or the continuous tempering galvanization. The device has at least one exchange member for transferring the heat of the steel strip to cooling water and includes an outlet for the cooling water thus heated up. At least one cooling unit is provided and has a sealed enclosure connected to the outlet of the exchange member and includes at least one outlet to a Venturi effect device such as a vapor outlet ejector and in which the cooling water itself is subjected to a vacuum-vaporization cooling. An auxiliary outlet of the sealed enclosure is connected to an inlet of the exchange member.

Abstract: A method, and an apparatus, for operating a hydraulic shearing machine. For cutting a shearing-movement of at least one shear blade which is curved, starting from a starting-position under application of an overall actuating-force and for resetting of the shear blades which were moved for cutting to their starting-position after accomplishment of the shearing-movement, a reset-movement under application of an overall reset-force. The shearing-movement and the reset-movement are accomplished by a hydraulic actuating-mechanism comprising hydraulic cylinders, wherein the overall actuating-force and the overall reset-force being applied to the moved shear blades by at least one hydraulic cylinder of the actuating-mechanism. The magnitude of the overall actuating-force is adjustable by switching one or several hydraulic cylinders of the actuating-mechanism in and out of operation-mode.

Abstract: Process gas purification device (2) for a melt reduction system (1) comprising at least one reduction reactor (3) and a melting gasification reactor (4), a first line system (5) for discharging a furnace gas (6) from the reduction reactor (3) and a second line system (7) for discharging a generator gas (8) from the melting gasification reactor (4) wherein both line systems (5,7) lead to a respective wet scrubbing system (11, 12). The furnace gas or generator gas flow can be throttled preferably by way of a control element (41) that varies a control gap (40) and the scrubber or cooling liquid (49) can be collected and drained. The first wet scrubber system (11) of the first line system (5) for routing the furnace gas (6) and the second Venturi scrubber system (12) of the second line system (7) for routing the generator gas (8) both discharge into a common mist elimination device (14).

Abstract: A system for maintaining a continuous speed in a long rolling mill is provided that includes a plurality of guide rollers that feed a billet product from a caster to an entry roll stand along a mill pass line to an exit roll stand. Also, the system includes a plurality of gauges positioned at a plurality of locations along the mill pass line, the gauges perform speed measurement of the billet product passing along the guide rollers. Furthermore, the system includes a logic controller that receives the speed measurement and maintains a speed relationship where the speed between the caster and the entry roll stand is constant as well as the exit speed of the end roll stand is also constant.

Abstract: A method for the production of a hot-rolled steel strip from a steel melt in a continuous manufacturing process: continuously casting a steel strand in a continuous casting mold of a continuous casting plant, roll-forming the case steel strand in a first group of roll stands into a pre-rolled hot strip, roll-forming the pre-rolled hot strip in a second group of roll stands into a hot-rolled steel strip, setting the hot strip to a rolling temperature between the first and second groups, and winding or dividing the hot-rolled steel strip; further: descaling the hot strip before temperature setting, holding the hot strip in a protective gas atmosphere during temperature setting. A combined casting and rolling plant for the method is disclosed.

Abstract: A method for changing rollers in a roll stand adapted for bearing at least one working roller for a continuously-running steel-strip roll mill, includes providing the stand as part of a plurality of roll stands disposed in series along the roll mill in a continuous running direction. A rolling standby function in a free clamping position of the roller(s) is allocated to at least one dedicated stand among the plurality of stands. Original setpoint values controlling an adjustment of the roller clamping are individually allocated to the other stands in an active rolling position. In the case of a roller change when passing into the free clamping position of the stand, the original setpoint value of the stand and the original setpoint values of the stands remaining in an active rolling position are redistributed individually among each of the stands, including the dedicated stand.

Abstract: A device for inspecting a moving metal strip includes a first electromagnetic acoustic transducer having an ultrasonic wave emitter. The waves emitted from the emitter are emitted to be incident on a first edge of a surface of the strip, and the emitter is not in contact with the strip. A second electromagnetic acoustic transducer is provided and includes an ultrasonic wave receiver. The waves received emerging from an area of the strip surface toward the receiver, the receiver is not in contact with the strip. A processing unit is coupled to the second electromagnetic acoustic transducer to provide an inspection criterion using a signature of the ultrasonic waves measured. The area is located on the strip such that a wave path between the first edge of the strip and the area is aligned in a linear direction mainly transverse to the direction of movement of the strip.

Abstract: A system for guiding a mobile carriage in a frame. The frame has three parallel linear-guiding tracks including a first track extending centrally on the frame and second and third tracks arranged laterally of the first track. The carriage has at least two axes of rotation. A first axis drives at least a first wheel in the first guiding track and a second axis drives at least a second wheel and at least a third wheel, respectively, in the second and third guiding tracks. The two axes of rotation are perpendicular. The description also relates to an associated method. A primary object is to enable the end of a mobile beam, such as a beam carrying a device for wiping a galvanizing product off a steel strip, to perform a guided movement with a high degree of freedom while minimizing mechanical stresses.