Disclosed is a skew rolling assembly suitable for large-size superalloy bars, including four rollers with completely identical shape and size, where the four rollers are all active rollers. In the production process, the four rollers play a role in promoting the forward flow of blank metal in a rolling direction, thus avoiding a rolling jamming phenomenon caused by the obstruction of guide plates to the forward flow of the blank in the rolling process of the prior art. The providing of the four rollers improves the rolling speed and increases the degree of deformation. Disclosed is a skew rolling method suitable for large-size superalloy bars. By utilizing the skew rolling assembly suitable for the large-size superalloy bars, and utilizing four rotating active rollers for the skew-rolling forming of bars, the rolling speed is improved, the problem that the cooperative rolling of two rollers and guide plates in the prior art is prone to the phenomenon of rolling jamming is avoided, the forming quality is guaranteed, the rolling production efficiency is improved, and the degree of deformation is increased.

The disclosure provides a rolling mechanism for grain refinement of an M50NiL rod. The rolling mechanism includes two main rolls and two auxiliary rolls. The two main rolls are opposite to each other and the two auxiliary rolls are opposite to each other, and the two main rolls and the two auxiliary rolls are disposed around a rolling line to form a nip zone. In any cross section of the nip zone with the rolling line as a normal line, a first line connecting the central axes of the two main rolls is perpendicular to a second line connecting the central axes of the two auxiliary rolls; each main roll further includes a first protrusion portion, a first end portion and a second end portion. The first end portion and the second end portion are disposed opposite each other along a corresponding roll axis.

A hot rolling mill 1 includes a control apparatus 20 that adjusts an angle formed between an upper-side pair of an upper backup roll 120A and an upper work roll 110A and a lower-side pair of a lower backup roll 120B and a lower work roll 110B in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel. The hot rolling mill 1 is configured such that the work rolls 110A and 110B satisfy the condition that DW/Lb is equal to or smaller than 0.30 where DW is a diameter of the work rolls 110A and 110B, and Lb is the maximum strip width of a rolled material, and the hot rolling mill 1 performs rolling in a state where a bending force is applied to the work rolls.

A rolling apparatus for a secondary battery electrode sheet, may include: a transfer unit transferring an electrode sheet having an electrode mixture layer applied to at least one surface thereof in a first direction; a rolling roll pressing the electrode sheet in a second direction, intersecting the first direction; and a support portion coupled to a rotational axis of the rolling roll to support rotation of the rolling roll, wherein the rolling roll May have a shape in which a central portion thereof in an axial direction protrudes further toward the electrode sheet than both end portions of thereof in an axial direction.

A method manufacturing a steel strip, including the subsequent steps of hot rolling the strip into a hot rolled strip, cold rolling the hot rolled strip and hot dip coating the cold rolled strip with a Zn based coating by leading the strip through a bath including molten zinc and wiping the strip after the coating using a gas knife having a knife slot from which a wiping gas is projected and the steel strip is cold rolled to a final cold rolled thickness of between 0.40 mm and 1.00 mm in a multi-stand cold rolling mill, and the coated steel sheet includes a steel substrate provided with a hot dip metal coating.