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US 12,337,365 B2Granted
Plant and method for producing flat rolled products
AssigneeDanieli & C. Officine Meccaniche SpA
InventorsGianpietro Benedetti, Paolo Bobig, Matteo Remy Bulfone
Life of this patent
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Abstract
A plant and a method for producing a final strip starting from a slab having a determinate starting thickness, including: at least one heating furnace configured to heat at least the slab to a determinate starting temperature; at least one reversible roughing stand configured to subject the slab to one or more rolling passes in order to obtain an intermediate rolled product; and a continuous rolling train disposed operatively in line with the roughing stand and configured to reduce the thickness of the intermediate rolled product, until the final strip having a determinate final thickness is obtained.
Claims9
A rolling plant, for producing a final strip starting from a slab having a determinate starting thickness, comprising:
- at least one heating furnace configured to heat at least said slab to a determinate starting temperature between about 1100° C. and 1200° C.;
- at least one reversible roughing stand configured to subject said slab to one or more rolling passes in order to obtain an intermediate rolled product;
- a continuous rolling train disposed operatively in line with said at least one roughing stand and configured to reduce the thickness of said intermediate rolled product, until said final strip having a determinate final thickness is obtained;
- wherein said rolling train comprises at least one pre-finishing stand disposed at a minimum distance D from said roughing stand so that the intermediate rolled product is never operatively engaged with one roughing stand of the at least one roughing stand and simultaneously engaged with one pre-finishing stand of the at least one pre-finishing stand, and wherein the at least one pre-finishing stand is able to reduce the thickness of said intermediate rolled product in order to obtain a pre-finished rolled product, and a plurality of finishing stands able to reduce the thickness of said pre-finished rolled product in order to obtain said final strip, and wherein a rapid heating device consisting of selectively activatable elements, the selectively activatable elements together having a total rated output between 38 MW and 45 MW, is interposed between said at least one pre-finishing stand and said plurality of finishing stands, and is configured to heat said pre-finished rolled product so that a target temperature of said final strip, in correspondence with the outlet of the last finishing stand of said rolling train, is higher than at least 830° C., even for a final thickness <1.2 mm, and
- wherein a rolling speed in said plurality of finishing stands is lower than 12 m/s in order to reduce or eliminate a need for a speed-up as a tool for reaching said target temperature.
2 more elements
A rolling method, for producing a final strip starting from a slab having a determinate starting thickness, in a rolling plant which comprises:
- at least one heating furnace configured to heat at least said slab to a determinate starting temperature T1 between about 1100° C. and 1200° C.;
- at least one reversible roughing stand configured to subject said slab to one or more rolling passes in order to obtain an intermediate rolled product;
- a continuous rolling train disposed operatively in line with said at least one roughing stand and configured to reduce the thickness of said intermediate rolled product, until said final strip having a determinate final thickness is obtained;
- wherein said method comprises at least one pre-finishing rolling of said intermediate rolled product, by means of at least one pre-finishing stand of said rolling train disposed at a minimum distance D from said roughing stand so that the intermediate rolled product is never operatively engaged with one roughing stand of the at least one roughing stand and simultaneously engaged with one pre-finishing stand of the at least one pre-finishing stand, and
- wherein the at least one pre-finishing stand reduces the thickness of said intermediate rolled product in order to obtain a pre-finished rolled product, at least one finishing rolling of said pre-finished rolled product, by means of a plurality of finishing stands of said rolling train which are able to reduce the thickness of said pre-finished rolled product, in order to obtain said final strip, and at least one step of heating said pre-finished rolled product, by means of a rapid heating device consisting of selectively activatable elements, the selectively activatable elements together having a total rated output between 38 MW and 45 MW, and interposed between said at least one pre-finishing stand and said plurality of finishing stands, so that a target temperature of said final strip, in correspondence with the outlet of the last finishing stand of said rolling train, is higher than at least 830° C., even for a final thickness <1.2 mm, and
- wherein a rolling speed in said plurality of finishing stands is lower than 12 m/s in order to reduce or eliminate a need for a speed-up as a tool for reaching said target temperature.
3 more elements
Dependencies are inferred from the claim text.