Abstract:
In the manufacture of hot-rolled steel strip, a continuous casting machine casts a slab and a roll stand for reducing the thickness of the slab to make strip is incorporated in line with the continuous casting machine. Advantages of simplicity and rolling quality are obtained when the roll stand is a two-high roll stand having a single pair of rolls. Where there is a reheater for reheating the strip after its rolling in the two-high roll-stand, the two-high roll stand is the sole apparatus for reducing the thickness of the slab after full solidification of the slab and prior to entry of the strip into the reheater.
Abstract:
In the manufacture of formable steel strip having a thickness between 0.5 and 1.5 mm, the following process steps are performed sequentially in a continuous process:(a) in a continuous casting machine forming liquid steel into a hot slab having a thickness of less than 100 mm,(b) hot rolling the hot slab from step (a), in the austenitic region and below 1100.degree. C., to form strip having a thickness of between 2 and 5 mm,(c) cooling the strip from step (b) to a temperature between 300.degree. C. and the temperature T.sub.t at which 75% of the steel is converted to ferrite,(d) rolling the cooled strip from step (c) at said temperature between 300.degree. C. and T.sub.t with a thickness reduction of at least 25% at a rolling speed not more than 1000 m/min.,(e) coiling the rolled strip from step (d).
Abstract:
A method of manufacturing formable as-rolled thin steel sheets having excellent ridging resistance and other properties is disclosed, which comprises rolling a low carbon steel to a given thickness without cold rolling and recrystallization annealing steps. In this rolling, at least one rolling pass is carried out within a given temperature range at high draft and high strain rate.
Abstract:
Thin steel sheets having an improved processability are produced when a steel sheet or cast strip obtained through a continuous casting or strip caster process is subjected to a lubrication rolling step at a temperature of from Ar.sub.3 transformation point to 300.degree. C. and a rolling speed of not less than 1,500 m/min. By this method, the cold rolling step or cold rolling-annealing step can be omitted.
Abstract:
Ein Rechner (4) ermittelt anhand eines momentanen Anfangszustands (ZA) eines Stahlvolumens (1) und mindestens einer über die Volumenoberfläche auf das Stahlvolumen (1) einwirkenden momentanen Einflussgrösse (W) durch Lösen einer Wärmeleitungsund einer Phasenumwandlungsgleichung einen Folgezustand (ZF) des Stahlvolumens (1). Die Zustände (ZA, ZF) umfassen für mindestens ein Volumenelement (9) des Stahlvolumens (1) eine lokale Konzentrationsverteilung (K) eines im Stahl beweglichen Legierungselements, lokale Anteile (p1, p2, p3) von modellierten Phasen des Stahls und eine den lokalen Energieinhalt des Stahls beschreibende Grösse (H). Die Phasen umfassen Austenit und eine weitere Phase, in der Regel Ferrit oder Zementit. Im Rahmen der Umwandlungsgleichung wird ermittelt, welche Konzentrationen (k1, k3; k2, k4) des beweglichen Legierungselements beidseits einer Phasengrenze (11, 12) zwischen Austenit und der weiteren Phase vorliegen. Ferner wird durch Lösen eines Stefan-Problems ermittelt, ob und wie sich die Konzentrationsverteilung (K) des beweglichen Legierungselements im austenitischen Bereich des betrachteten Volumenelements (9) ändert und ob und um welches Ausmass (δx', δx") sich die Phasengrenze (11, 12) dadurch verschiebt. Anhand der Lage der Phasengrenze (11, 12) werden dann die lokalen Anteile (p1, p2, p3) der Phasen ermittelt.
Abstract:
Process for producing a ferritically rolled steel strip, in which liquid steel is cast in a continuous-casting machine (1) to form a slab and, utilizing the casting heat, is conveyed through a furnace device (7) undergoes preliminary rolling in a preliminary rolling device (10) and, in a final rolling device (14), is finishing-rolled to form the ferritic steel strip with a desired final thickness, in which process, in a completely continuous, an endless or a semi-endless process, the slab is rolled in the austenitic range in the preliminary rolling device (10) and, after rolling in the austenitic range, is cooled to a temperature at which the steel has a substantially ferritic structure, and the strip is rolled, in the final rolling device, at speeds which substantially correspond to the speed at which it enters the final rolling device (14) and the following thickness reduction stages, and in at least one stand of the final rolling device (14), the strip is ferritically rolled at a temperature of between 850 DEG C and 600 DEG C, and, after leaving the final rolling device (14), is cooled rapidly to a temperature below 500 DEG C in order substantially to avoid recrystallization.
Abstract translation:制造铁素体钢带的方法,其中在连续铸造机(1)中铸造液态钢以形成板坯,并且利用铸造热量输送通过炉装置(7)进行初步轧制 轧制装置(10),并且在最终轧制装置(14)中进行精轧,以形成具有所需最终厚度的铁素体钢带,其中以完全连续的无限或半无限制工艺, 在预轧装置(10)的奥氏体区域中轧制板坯,在奥氏体区域中轧制后,在最终轧制中将钢冷却至钢基本上为铁素体结构的温度,轧制 装置,其速度基本上对应于进入最终轧制装置(14)的速度和随后的厚度减小阶段,并且在最终轧制装置(14)的至少一个支架中,钢带在 TE 温度在850℃至600℃之间,并且在离开最终轧制装置(14)之后,迅速冷却到低于500℃的温度,以便基本上避免重结晶。
Abstract:
A process for obtaining steel strip coils with characteristics of a cold-rolled product, directly in a hot-rolling line, comprises subsequently to steps of casting and thickness reduction at a temperature of more than 1100 DEG C upon solidification, induction heating of the product and a further step of hot rolling, above point Ar3, a step of cooling and temperature control in a range of between 600 and 250 DEG C, thus lower than said point Ar3, as well as one or more passes of cold-rolling in series, with final coiling of the obtained product. Also a preferred plant is described for putting into practice such a process.
Abstract:
The invention relates to the iron and steel industry. More specifically, the invention describes the manufacture of steel strip intended to be converted into thin packaging, such as for drinks and preserved food.
Abstract:
The invention relates to a process for the production of tailored blanks by the hot rolling of a strip and to an apparatus for the performance of said process. To obtain tailored blanks to be cut to length from the rolled strip, the hot strip is cooled or heated in portions, so that with a substantially constant rolling force the strip undergoes a differential decrease in thickness in the individual portions, which have been given a differential yield stress value by the differential temperature adjustment.