Abstract:
Disclosed are a method and an installation for producing steel products (1) having an optimum surface quality, especially extremely low carbon contents (UCL steel or IF steel), nitrogen contents, total oxygen contents, high-strength or stainless steel qualities. According to the invention, the liquid steel is cast into a thin slab (5a) from a process route (10, 11, 12, or 13) that is selected according to the desired final structure (9) based on an electric-arc furnace (2b), is descaled, cut into billets (15) having a partial length, optionally descaled once again, subjected to final descaling downstream from a holding furnace (16), milled in a finishing mill train (6a), rolled up in a rolling station (20) located downstream from the last finishing mill stand (19) or downstream from a cooling section (21), and the final structure (9) is adjusted in the cooling section (21) according to the desired steel quality by cooling on a run-out roller table (22), whereupon the rolling stock (1a) is completely rolled up in a second rolling station (23).
Abstract:
Zum Erzeugen eines Stahlbandes (1) weist eine Gießwalzanlage eine Flüssigstahl-Vorratseinrichtung (2), eine Flüssigstahl-Zugabevorrichtung (3), eine vertikal arbeitende Gießeinrich-tung (5) mit mitlaufender Kokille (6), eine Reduktionsein-richtung (7) mit einer Vielzahl von Rollenpaaren (8), eine Umlenkeinrichtung (9) zum Umlenken des gegossenen Stahlbandes (1) in eine horizontale Lage, ein horizontal arbeitendes Walzwerk (10) und eine Haspeleinrichtung (11) auf, die über einzelne technologische Regelkreise (2' bis 11') geführt wer-den. Zur integrierten Einstellung der technologischen Regel-kreise (2' bis 11') weist sie ferner ein die Anlagenteile (2 bis 11) regelungstechnisch miteinander verbindendes Leitsys-tem (12) auf, das auf der Basis von mathematischen Modellen (17) arbeitet und die einzelnen Anlagenteile (2 bis 11) in Bezug auf ihr Zusammenwirken in Abstimmung aufeinander derart führt, dass die Auswirkungen der Regelschritte eines Anlagen-teils (2 bis 11) auf in Massenflussrichtung folgende Anlagen-teile (2 bis 11) berücksichtigt werden.
Abstract:
A continuous caster to cast a metal product has a plurality of upper and lower segment frames bearing rolls, the upper and lower segment frames being located respectively above and below the cast metal product. At least one bending measurer is located on at least one of the upper segment frames and able to emit a bending measurement signal indicative of a bending of the at least one of the upper segment frames. A processor is disposed to receive the bending measurement signal and to calculate a location Pmes of the crater end based on the measured bending signal, the crater end location being the location
Abstract:
A primary object of this invention is to provide a continuous casting method by which a slab of excellent internal quality can be obtained even if the casting speed is changed. In this invention, upon continuous casting with two pairs of the reduction rolls arranged along a casting direction and support rolls arranged between the reduction rolls, when a casting speed is reduced compared to a state where combination of reduction with reduction rolls at a first stage on an unsolidified portion of the slab and reduction with reduction rolls at a second stage on a solidified portion thereof is employed, the combination is switched to combination of reduction with the reduction rolls at the first stage on a portion of the slab at an end of solidification and the reduction with the reduction rolls at the second stage on the solidified portion thereof.
Abstract:
A primary object of this invention is to provide a continuous casting method by which a slab of excellent internal quality can be obtained even if the casting speed is changed. In this invention, upon continuous casting with two pairs of the reduction rolls arranged along a casting direction and support rolls arranged between the reduction rolls, when a casting speed is reduced compared to a state where combination of reduction with reduction rolls at a first stage on an unsolidified portion of the slab and reduction with reduction rolls at a second stage on a solidified portion thereof is employed, the combination is switched to combination of reduction with the reduction rolls at the first stage on a portion of the slab at an end of solidification and the reduction with the reduction rolls at the second stage on the solidified portion thereof.
Abstract:
A primary object of this invention is to provide a continuous casting method by which a slab of excellent internal quality can be obtained even if the casting speed is changed. In this invention, upon continuous casting with two pairs of the reduction rolls arranged along a casting direction and support rolls arranged between the reduction rolls, when a casting speed is reduced compared to a state where combination of reduction with reduction rolls at a first stage on an unsolidified portion of the slab and reduction with reduction rolls at a second stage on a solidified portion thereof is employed, the combination is switched to combination of reduction with the reduction rolls at the first stage on a portion of the slab at an end of solidification and the reduction with the reduction rolls at the second stage on the solidified portion thereof.
Abstract:
Disclosed are a method and an installation for producing steel products (1) having an optimum surface quality, especially extremely low carbon contents (UCL steel or IF steel), nitrogen contents, total oxygen contents, high-strength or stainless steel qualities. According to the invention, the liquid steel is cast into a thin slab (5a) from a process route (10, 11, 12, or 13) that is selected according to the desired final structure (9) based on an electric-arc furnace (2b), is descaled, cut into billets (15) having a partial length, optionally descaled once again, subjected to final descaling downstream from a holding furnace (16), milled in a finishing mill train (6a), rolled up in a rolling station (20) located downstream from the last finishing mill stand (19) or downstream from a cooling section (21), and the final structure (9) is adjusted in the cooling section (21) according to the desired steel quality by cooling on a run-out roller table (22), whereupon the rolling stock (1a) is completely rolled up in a second rolling station (23).
Abstract:
A method for producing steel products (1) with optimum surface quality wherein the molten steel (1b) is produced in a process route (10, 100; 12; 13) that is selected according to a desired final microstructure (9), by melting in a furnace (2b) with an electrode system (31), and in a vacuum degassing system; or by melting in a furnace installation (35) or an individual furnace vessel (30), in a ladle furnace (25), and in a differential-pressure vacuum degassing system (43); or by melting in a furnace (2b) with additions of alloying materials (26), a partial-quantity degassing in the ladle furnace (25), or a vacuum degassing system (27) and a ladle degassing (27).