Abstract:
A method and an installation for the endless production of hot-rolled, flat products from thin cast strip. The installation includes a casting machine for producing cast strip, a device for cooling the cast strip under inert gas, a single-stand roughing train, a multi-stand finishing train, a device for cooling, heating or maintaining the temperature of the hot-rolled strip, according to choice, between the roughing train and the finishing train, shears for separating the hot-rolled strip from coil to coil, a delivery roller table with devices for cooling the hot-rolled strip and with coiling machines arranged downstream of the finishing train for coiling up the finished strip.
Abstract:
A plain carbon steel strip is continuously cast in a twin roll caster and passes to a run out table on which it is subjected to accelerated cooling by means of cooling headers whereby it is cooled to transform the strip from austenite to ferrite at a temperature range between 850null C. and 400null C. at a cooling rate of not less than 90null C./sec, such that the strip has a yield strength of greater than 450 MPa. The strip after casting and before cooling is passed through a hot rolling mill to reduce the thickness of strip by at least 15% and up to 50%.
Abstract:
Hot rolled steel strip is produced from continuously cast semi-finished steel in directly successive work steps, in which, after conversion of the molten steel into continuously cast semi-finished steel in a stationary process, the semi-finished steel is fed directly from the continuous casting to a continuous hot rolling mill, without prior separation, and an endless steel strip of any desired thinness is produced at the final rolling temperatures usual in process technology directly from the primary heat, using certain parameters.
Abstract:
A production plant for rolling hot strip from slabs produced by continuous casting, wherein a shearing machine is arranged following a continuous casting plant of the casting machine and in front of an equalizing furnace, and an additional shearing machine and a descaling unit are arranged following the equalizing furnace and in front of a rolling mill, and wherein a heating or cooling unit and a strip reeling unit of coiling machine are arranged following the rolling mill. A first roll stand group forming a continuously operating rolling train is composed of several four-high stands, for example, five four-high stands; individual heating devices are provided also between the successive four-high stands of this group of roll stands; in addition, the reeling unit or the reeling machine is configured as a double reeling machine.
Abstract:
A production plant for producing hot-rolled flat products includes a rolling train composed of a plurality of roll stands, a run-out table with devices for cooling the hot strip, and with subsequently arranged coiling machines for coiling the strip. At least the first roll stand of the rolling train is a reversing stand. At least one reeling furnace each is arranged in front of and following the reversing stand. A controllable cooling unit is provided between the reversing stand and the reeling furnace in front of the reversing stand.
Abstract:
The invention relates to a method for producing tailored blanks by hot-rolling a strip, and to a device for carrying out the method. The tailored blanks to be cut to length from the rolled strip are obtained by cooling or heating the hot strip in sections, so that it experiences a different reduction in thickness in the individual sections whilst the roll force remains essentially constant, the sections having been given a different yield stress value due to the different temperature settings.
Abstract:
Rolling method for thin flat products, used in the production of flat rolled products with a final thickness in the range of 0.6÷1.5 mm or more, up to 2.0÷3.0 mm, in a plant suitable to work thicknesses of up to 25.4 mm, the method being applied to slabs with a thickness of between 50 and 90 mm if arriving directly from the continuous casting machine or on slabs with a greater thickness, of between 80 and 200÷250 mm, if fed from a furnace to accumulate and heat the slabs (22), the method comprising at least a first heat treatment, a roughing or pre-finishing pass, a temperature equalisation treatment and a finishing pass in a finishing train (19) comprising at least three reduction passes, the finishing pass being followed by a step of cooling and coiling the flat finished product, the product at the outlet of the roughing or pre-finishing pass being in the austenitic state γ, the finishing pass taking place in the rolling line (10) at least partly in the ferritic step or in the austenitic step, as desired. Rolling line adopting the method as above, wherein the finishing train (19) cooperates with a system (24) to condition and adjust the temperature of the slab.
Abstract:
The invention concerns a method of producing hot-rolled steel strip from continuously cast semi-finished steel in operating steps which follow one another directly. According to the invention, when the liquid steel has been transformed into the semi-finished steel in a stationary process, the semi-finished steel is introduced directly into a continuous hot-rolling mill without previously being separated from the continuous casting machine. By applying specific parameters, continuous steel strip of any thickness is then produced directly using the primary heat at the final rolling temperatures conventional in industrial processes.
Abstract:
Rolling method for thin flat products, used in the production of flat rolled products with a final thickness in the range of 0.6÷1.5 mm or more, up to 2.0÷3.0 mm, in a plant suitable to work thicknesses of up to 25.4 mm, the method being applied to slabs with a thickness of between 50 and 90 mm if arriving directly from the continuous casting machine or on slabs with a greater thickness, of between 80 and 200÷250 mm, if fed from a furnace to accumulate and heat the slabs (22), the method comprising at least a first heat treatment, a roughing or pre-finishing pass, a temperature equalisation treatment and a finishing pass in a finishing train (19) comprising at least three reduction passes, the finishing pass being followed by a step of cooling and coiling the flat finished product, the product at the outlet of the roughing or pre-finishing pass being in the austenitic state γ, the finishing pass taking place in the rolling line (10) at least partly in the ferritic step or in the austenitic step, as desired. Rolling line adopting the method as above, wherein the finishing train (19) cooperates with a system (24) to condition and adjust the temperature of the slab.