Abstract: An acid solution preparation device is an acid solution preparation device for preparing an acid solution used for pickling of a steel plate, the device including a sealed tank for storing the acid solution, a gas supply part for supplying an oxygen-containing gas from outside of the sealed tank to the sealed tank, and a purge part for discharging a gas in the sealed tank to the outside.

Abstract: A manufacturing method of an impeller includes forming a plurality of blades integrally on a blade attachment surface of one of a disc and a cover, placing the cover on a floor so as to face up the blade attachment surface of the cover, disposing the disc on the cover so as to face down the blade attachment surface of the disc, and bonding the plurality of blades to the blade attachment surface of the other of the disc and the cover which is not formed integrally with the plurality of blades by using a bonding material.

Abstract: A manufacturing method of an impeller includes: forming a plurality of blades integrally on a blade attachment surface of one of a disc and a cover; placing the cover on a floor so as to face up the blade attachment surface of the cover; disposing the disc on the cover so as to face down the blade attachment surface of the disc; and bonding the plurality of blades to the blade attachment surface of the other of the disc and the cover which is not formed integrally with the plurality of blades by using a bonding material.

Abstract: A continuous casting apparatus having a pair of drums rotating in opposite directions, and bearing housings for rotatably supporting drum shafts protruding from opposite end surfaces of the drums, the continuous casting apparatus comprising, on a side of at least one of the drums: a base portion; an arm having an end portion on which the bearing housing is installed fixedly, and having an opposite end portion pivotably supported by the base portion; and an adjusting device for pivoting the arm to move the pair of drums toward or away from each other.

Abstract: When a molten steel (106) is supplied into a moving mold defined by concave rolls (101, 102) and side checks (103, 104), the molten steel (106) is cooled by the surfaces of the rolls (surfaces except steps) to form solidified shells (111, 112). Both solidified shells (111, 112) are pressure bonded, and pulled out as a cast piece (113). A heat insulator (ceramic coating) has been applied to the circumferential surfaces of steps (101a, 101b, 102a, 102b) which are opposite end portions of the rolls. Thus, at these portions, heat dissipation does not proceed, and no solidified shells are formed. Hence, clearances are formed between the opposite ends of the solidified shells (111, 112) and the side checks (103, 104), and the solidified shells (111, 112) do not contact the side checks (103, 104), with the result that the wear of the side checks (103, 104) is prevented.

Abstract: There is provided a hydrogen separation membrane capable of providing high hydrogen permeability and accommodating an increase in pressure difference, a hydrogen separation unit, and a manufacturing method for a hydrogen separation membrane. The hydrogen separation unit 1 has a hydrogen separation membrane 10 and a metallic porous support sheet 20 attached to the hydrogen separation membrane 10. By forming a plurality of pits in the surface of the hydrogen separation membrane 10, a thick-wall portion 15 having a large thickness and a thin-wall portion 16 having a small thickness are provided on the hydrogen separation membrane 10. Also, as a method for forming pits i.e. thin-wall portions 16, etching process is used.

Abstract: There is provided a hydrogen separation membrane capable of providing high hydrogen permeability and accommodating an increase in pressure difference, a hydrogen separation unit, and a manufacturing method for a hydrogen separation membrane. The hydrogen separation unit 1 has a hydrogen separation membrane 10 and a metallic porous support sheet 20 attached to the hydrogen separation membrane 10. By forming a plurality of pits in the surface of the hydrogen separation membrane 10, a thick-wall portion 15 having a large thickness and a thin-wall portion 16 having a small thickness are provided on the hydrogen separation membrane 10. Also, as a method for forming pits i.e. thin-wall portions 16, etching process is used.

Abstract: A twin drum type continuous casting apparatus is provided for continuously feeding molten metal into a cast portion defined by a pair of water cooling drums that are rotated in opposite directions to each other, thereby continuously casting a plate-like cast piece. A thin portion is formed close to an outer circumferential portion of each of opposite end portions, in a width direction, of each of the water cooling drums. A thin annular member having a hot water flow passage therein is formed in between the thin portion and a shaft with a space relative to an end face of each of the water cooling drums.