Abstract:
Devices and methods for cleaning a roller of a system for processing strip-type material may involve a suction duct in addition to a nozzle that directs a gas flow onto a surface of the roller. The nozzle and the suction duct may be disposed in a hood that covers part of a circumference of the roller. Further, the nozzle can be disposed at an angle within a range of ±45 degrees with respect to a normal line extending orthogonally from the surface of the roller. Moreover, the nozzle may be spaced less than 50 mm apart from the surface of the roller.
Abstract:
The invention relates to a method and a rolling stand (100) for cold rolling rolled stock. The rolling stand (100) comprises at least one upper and one lower backup roll (110-1, 110-2) and also an upper and a lower work roll (120-1, 120-2), which define a roll gap (128). Optionally, a lower and an upper intermediate roll (130-1, 130-2) may also be provided between the work rolls and the backup rolls. In order to ensure an absolutely equal circumferential speed of the upper and lower work rolls when cold rolling in skin-pass mode, it is proposed according to the invention to decouple the upper or lower work roll from its associated drive device.
Abstract:
A flow of rolling with a combination of asymmetric rolling (S1) and skin pass rolling (S3) is shown. Differential-speed rolling is performed as the asymmetric rolling, and a winder temporarily winds a metal strip with a collapsed plate shape by traverse winding (loose winding which allows the metal strip is wound in a zigzag manner: S2). Then, the skin pass rolling is performed, and orderly winding is performed in a coil form (S4). As shown in the flow of rolling, tandem rolling may be performed by arranging two or more rolling mills side by side so that the asymmetric rolling and the skin pass rolling are continuously performed without the traverse winding (S2) in the mid course.
Abstract:
The invention relates to a method for specifically adjusting the surface structure of rolling stock (3) during cold rolling in skin pass mills. The aim of the invention is to partially transfer the surface structure of the working roll (2) onto the rolling stock (3). To this end, the change of roughness of the rolling stock (3) in the rolling process of a single- or multiple-stand, preferably two-stand skin pass mill is calculated in an optimization calculation in which the rolling parameters are varied according to the mill capacity using a tribological model that mathematically describes the friction conditions in the roll gap (1). The results obtained are then used to readjust at least a part of the rolling parameters used for calculation.
Abstract:
Strip tension in metal strip subjected to a plastic deformation such as skin or dressing rolling, stretch bend leveling or stretching is adjusted by local variation of the temperature to establish a temperature profile which minimizes waviness and camber in metal strip.
Abstract:
Continuous production line for producing a strip of rolled sheet of steel comprising applying to said sheet of steel an aqueous pickling solution containing hydrochloric acid and ferric and ferrous pickling irons in solution, and, for the purpose of maintaining a constant pickling power of the aqueous solution of hydrochloric acid having a pH lower than 1, maintaining the concentration of Fe.sup.3+ ions at a value between 1 g/liter and 300 g/liter, by reoxidation of the Fe.sup.2+ ions produced during the pickling, the REDOX potential being maintained at a value between 400 and 600 mV, the potential being measured between a platinum electrode and a reference AG/AGCl electrode which are placed in the solution.
Abstract:
A process for applying a defined surface roughness to a metal strip, especially steel strip, for preventing the sticking of strip during subsequent annealing in a bell-type annealing installation includes cold rolling the metal strip in at least one reversing roll stand. The cold rolled metal strip is then guided to a temper rolling stand for wet rolling the cold rolled metal strip through at least one pass for applying the defined surface roughness to the metal strip. For this purpose, the flattening rolls of the temper rolling stand are replaced with rough rolls.
Abstract:
The invention refers to a process for production of raw stainless steel castings, in particular for stainless steel strip, covering rolling and annealing of cast material if required, as well as de-scaling, in particular by pickling in aqueous media, and coiling for raw stainless steel strip if necessary. In order to achieve greater flexibility as regards steel grades that can be treated and dimensions of the castings, the material is to be heat-treated in batches and preferably also annealed, cooled and de-scaled immediately after the final heat treatment stage, without intermediate storage, in batches. In a process covering the process stages for casting, rolling of the cast material if necessary, cooling, as well as de-scaling, in particular by pickling in aqueous media, and coiling, if necessary, to form raw stainless steel coils, the material is to be cast in batches and de-scaled immediately afterwards without intermediate storage in order to obtain the same advantage. The invention also covers equipment to carry out the process described.
Abstract:
A cold rolled steel strip having an excellent conversion coating property is produced by a process comprising:anodic electrolytically treating at least one non-plated surface of a cold rolled steel strip to form a layer of oxides thereon, andcathodic electrolytically treating the above-mentioned surface to remove a portion of the oxide layer to an extent that the remaining portion of the oxide layer is in an amount corresponding to a quantity of electricity of from 0.05 to 4.0 millicoulomb/cm.sup.2 which is necessary to completely remove the remaining portion of the oxide layer by means of a cathodic electrolytic treatment in an aqueous solution containing 19.06 g/l of borax and having a pH of 6.4 at a constant current density of 5 microampere/cm.sup.2 and is in the form of a number of separate dots corresponding to a natural reduction time of from 1.0 to 200 seconds.
Abstract translation:通过对冷轧钢带的至少一个非电镀面进行阳极电解处理而形成氧化物层的方法制造具有优异的转印涂布性的冷轧钢带,并对上述阴极进行阴极电解处理 表面以去除氧化物层的一部分,使得氧化物层的剩余部分的量相当于完全除去氧化物的剩余部分所需的0.05-4.0毫微仑/ cm 2的电量 层,通过阴极电解处理在含有19.06g / l硼砂的水溶液中,并且在5微安/ cm 2的恒定电流密度下具有6.4的pH,并且是多个对应于天然的分开的点的形式 缩短时间为1.0〜200秒。