Abstract: A plant and process for the continuous production of hot-rolled steel strips with a minimum thickness of 0.3 mm is disclosed which includes a continuous casting device of thin or medium slabs with a thickness between 40 and 150 mm and a maximum width of at least 2100 mm followed by a roughing mill, a first induction furnace, a water descaler, a second induction furnace, a finishing mill, a cooling station, a cutting station and a winding station. A system for feeding a protective atmosphere containing ?3% vol. oxygen is provided from the inlet of the second induction furnace to at least the third stand of the finishing mill. Between the continuous casting device and the roughing mill, an initial thermal conditioning and descaling section is provided having in sequence an induction edge heater, an induction heater for the rest of the slab surface and a water descaler.

Abstract: Mill rolls capable of rolling long kilometers used for ESP production line and a method for rolling long kilometers using the mill rolls. The mill rolls include rolls (3, 4), a bearing box (2) and a roll shifting hydraulic cylinder (1), wherein the middle portion of the surface of the roll sinks inwards, one end of the rolls is frustum-shaped, smaller and smaller outwards, so that the roll surface forms a compensation ramp, and the other end of the rolls is cylindrical. The upper roll (3) and the lower roll (4) have the same roll profile and are positioned in the opposite direction. The mill rolls are characterized by reduced runaway of the rolled product and a longer service life.

Abstract: A thin slab nozzle contains a central bore extending downstream along longitudinal axis X1 from an inlet orifice at an upstream end. The central bore comprises an upstream bore portion with a height Ha, in communication with a converging bore portion of height He, in communication with a thin bore portion of height Hf ending at the upstream end of a divider, and first and second front ports separated from one another by the divider and coupled to the central bore portion at least partially at the converging bore portion. X2 is a transverse axis, normal to X1, along which the nozzle becomes thinner in a downstream portion. In a section of the thin slab nozzle along a symmetry plane ?1 defined by X1 and by X2, the bore wall of the converging bore portion is curved at all points, and Hf/He?1.

Abstract: Mill rolls capable of rolling long kilometers used for ESP production line and a method for rolling long kilometers using the mill rolls. The mill rolls include rolls (3, 4), a bearing box (2) and a roll shifting hydraulic cylinder (1), wherein the middle portion of the surface of the roll sinks inwards, one end of the rolls is frustum-shaped, smaller and smaller outwards, so that the roll surface forms a compensation ramp, and the other end of the rolls is cylindrical. The upper roll (3) and the lower roll (4) have the same roll profile and are positioned in the opposite direction. The mill rolls are characterized by reduced runaway of the rolled product and a longer service life.

Abstract: A device for supporting and oscillating continuous casting molds in continuous casting plants includes at least one support suitable to support a continuous casting mold, the support including a fixed assembly restrained to a frame of the device and a movable assembly that is slidably restrained to the fixed assembly in a vertical direction and connected to a servomechanism suitable to move it in a reciprocating manner relative to the fixed assembly along the axial direction, the movable assembly including a plurality of channels suitable to allow a flow of a cooling fluid to and from a cooling circuit of the mold, the channels being supplied by supply pipes arranged along the vertical direction.

Abstract: A device for supporting and oscillating continuous casting moulds in continuous casting plants comprises at least one support suitable to support a continuous casting mould, said support comprising a fixed assembly restrained to a frame of the device and a movable assembly that is slidably restrained to said fixed assembly in a vertical direction (A) and connected to a servomechanism suitable to move it in a reciprocating manner relative to the fixed assembly along said axial direction (A), said movable assembly comprising a plurality of channels suitable to allow a flow of a cooling fluid to and from a cooling circuit of said mould, said channels being supplied by supply pipes arranged along the vertical direction (A).

Abstract: A micro-alloyed low carbon steel strip is obtained by hot rolling at temperature of the pre-strip never lower than 900° C. and shows such metallurgical and geometrical features, as well as relating to planarity and deformability, to render the same suitable to obtain structures of low weight and good mechanical resistance, thus being able for use in replacement of cold rolled strips for the production of finished stamped or cut pieces. Said steel strip, having thickness>0.7 mm, has a ratio yield load/breaking load>70%, a fine grain structure better than grade 10 of ASTM E 112 standard in a percentage higher than 90% of the whole structure and a ratio between breaking limit under strain and yield point ?/RPo.2>90%.

Abstract: Process and related plant for manufacturing steel plates with thickness<100 mm and width of up to 4000 mm from a continuous casting step for slabs, comprising a liquid core reduction step, without interruptions until completion of a finishing rolling step with high reduction ratios in at least one stand. The average temperature when entering the rolling step is ?1250° C., but can be reduced for unalloyed or low alloyed steel greatest.

Abstract: Process and related plant for manufacturing steel plates with thickness <100 mm and width of up to 4000 mm from a continuous casting step for slabs, comprising a liquid core reduction step, without interruptions until completion of a finishing rolling step with high reduction ratios in at least one stand. The average temperature when entering the rolling step is ?1200° C., but can be reduced for unalloyed or low alloyed steel greatest.

Abstract: A process for manufacturing steel strips with solution of continuity. The steps of the process include a continuous casting step for thin slabs with a high “mass flow,” a shearing step and subsequent heating in furnace, followed by a multiple stand rolling step with the average temperature of the product at the inlet of the rolling mill being higher than the surface temperature, which is equal to at least 1100° C., lower than that measured in the inner central area by about 100° C. A plant is also described for the accomplishment of such process where at the inlet of a furnace, possibly of the induction type, combined with a temperature maintaining tunnel a shear is provided for cutting into pieces a slab coming from continuous casting with the distance between the outlet of the continuous casting and the inlet into the finishing rolling mill is not greater than 100 m.

Abstract: A process for the manufacturing of steel strips with solution of continuity is described, comprising a continuous casting step for thin stabs with a high “mass flow”, a shearing step and subsequent heating in furnace, followed by a multiple stand rolling step, wherein the average temperature of the product at the inlet of the rolling is higher than the surface temperature, which is equal to at least 1100° C., lower than that measured in the inner central area by about 100° C. A plant is also described for the accomplishment of such process, wherein at the inlet of a furnace (25; 35), possibly of the induction type, combined with a temperature maintaining tunnel (36) a shear (3) is provided for, cutting into pieces (24; 34) a slab (22; 32) coming from continuous casting (21; 31), wherein the distance between the outlet of said continuous casting and the inlet into the finishing rolling mill (29; 39) is not greater than 100 m.

Abstract: A process for manufacturing steel long products provides for starting from a continuous casting step with liquid core reduction, followed by induction heating without interruption until the end of a rolling step in a plurality of stands. The blooms or billets subjected to such a process have initial thickness in the range between 120 and 400 mm and a high “mass flow” passing in the time unit at the outlet from the continuous casting, as well as an average temperature in the cross-section which is higher than the surface temperature, being in the core or inner middle region higher by 100° C. than on the surface, that is of about 1200° C. A plant for carrying out such a process is also described.

Abstract: A process and system for manufacturing metal strips of 0.14-20 mm thickness and metal sheets of 10-100 mm thickness from slabs of thickness between 30 and 300 mm by continuous casting of the bow type. The slab upon casting is fed without discontinuity directly to the rolling step after heating in an induction furnace without any intermediate product. The rolled flat product is withdrawn as sheet upon controlled cooling, by means of cutting and withdrawal device or wound on a reel to form a coil of a continuous strip severable by cutting device downstream of a cooling system. Surface cooling devices can be provided between rolling stands. The feed speed from continuous casting to the end of rolling is increasing step by step in relation to the thickness reductions and the quality of the end product, with regulation in cascade to the downstream direction.

Abstract: A process and system for manufacturing metal strips of 0.14-20 mm thickness and metal sheets of 10-100 mm thickness from slabs of thickness between 30 and 300 mm by continuous casting of the bow type. The slab upon casting is fed without discontinuity directly to the rolling step after heating in an induction furnace without any intermediate product. The rolled flat product is withdrawn as sheet upon controlled cooling, by means of cutting and withdrawal device or wound on a reel to form a coil of a continuous strip severable by cutting device downstream of a cooling system. Surface cooling devices can be provided between rolling stands. The feed speed from continuous casting to the end of rolling is increasing step by step in relation to the thickness reductions and the quality of the end product, with regulation in cascade to the downstream direction.

Abstract: A hot rolled dual phase steel strip with Thickness® 1.0 mm can be used for producing cold pressed and cut pieces, in particular for the car manufacturing industry, by replacing with the same mechanical performances the cold rolled dual phase steel strip usually employed for these purposes. Said hot rolled strip in peritectic steel has a carbon percentage between 0.06 and 0.15% with chemical analysis without any important addition of chromium and phosphorous, with a constant geometrical profile on the whole length and tolerances, particularly with respect to the thickness, which are typical of a cold rolled strip with parallelism <0.05 mm, crown between strips centre and side edges <0.07 mm, while showing a structure with a microcrystalline fineness better than grade 10 of the ASTM 112 standard in a percentage higher than 80% of the whole structure.

Abstract: A process is described for producing steel strips suitable for receiving a surface coating which is resisting to oxidation, in particular tin plating, of medium productivity, that does not require for its execution plants extended of a large areas or involving high economical investments. It comprises, starting from pickled hot strips having a thickness >0.7 mm, preferably obtained from thin-slab plants, a single cold rolling step by passing through not more than three stands of the Sendzimir 6Zhi type for the cold reduction of thickness to less than 0.25 mm and subsequent annealing. It is possible to obtain final thicknesses <0.18 mm both by simple reduction, which only provides subsequent skin-passing and finishing steps, and by double reduction on half-raw strip, which provides subsequent passes for thickness reduction of 30%.

Abstract: A micro-alloyed low carbon steel strip is obtained by hot rolling at temperature of the pre-strip never lower than 900° C. and shows such metallurgical and geometrical features, as well as relating to planarity and deformability, to render the same suitable to obtain structures of low weight and good mechanical resistance, thus being able for use in replacement of cold rolled strips for the production of finished stamped or cut pieces. Said steel strip, having thickness >0.7 mm, has a ratio yield load/breaking load >70%, a fine grain structure better than grade 10 of ASTM E 112 standard in a percentage higher than 90% of the whole structure and a ratio between breaking limit under strain and yield point ?Fp/RPo.2>90%.

Abstract: A hot rolled low carbon steel strip with a reduced content of silicon and thickness comprised between 0.65 and 1.5 mm can be used in a particularly advantageous way for the production of multilayer packs of cold cut lamination and all those products composed of a number of overlying steel sheets which are required to have a substantial parallelism, planarity and no burrs, providing a valid alternative solution to the cold rolled, non-oriented grain silicon steel strip which is usually employed to this purpose. Said steel strip is characterized by a silicon content <0.03%, a thickness preferably between about 0.65 and 1 mm, reduced tolerances of ±0.05 mm, a parallelism rate <0.02 mm and a fine and uniform grain structure with the 70% of the ferritic grains comprised between the grades 9 and 12 of the ASTM E 112 standard.

Abstract: Process and related plant for manufacturing steel plates with thickness <100 mm and width of up to 4000 mm from a continuous casting step for slabs, comprising a liquid core reduction step, without interruptions until completion of a finishing rolling step with high reduction ratios in at least one stand. The average temperature when entering the rolling step is ?1200° C., but can be reduced for unalloyed or low alloyed steel greatest.

Abstract: A process for manufacturing steel long products provides for starting from a continuous casting step with liquid core reduction, followed by induction heating without interruption until the end of a rolling step in a plurality of stands. The blooms or billets subjected to such a process have initial thickness in the range between 120 and 400 mm and a high “mass flow” passing in the time unit at the outlet from the continuous casting, as well as an average temperature in the cross-section which is higher than the surface temperature, being in the core or inner middle region higher by 100° C. than on the surface, that is of about 1200° C. A plant for carrying out such a process is also described.