Abstract: According to an apparatus and a method for manufacturing a hot-rolled steel plate, a roughing process for reducing a thickness of a continuously cast slab is performed to obtain a sheet bar, and a finishing rolling process for rolling the sheet bar is effected to produce a hot-rolled steel plate having a predetermined plate thickness. After cooling down, the hot-rolled steel plate is then wound. A pair of dies 6 each of which has a tapered portion 6b on an input side and a parallel portion 6b on an output side are used in at least part of the roughing process. Further, before performing plate thickness pressing to a material in a plate thickness direction by using the dies 6, at least one of a front end and a rear end of the material is pressed in a widthwise direction to be pre-formed.

Abstract: A material 1 to be shaped is reduced and formed by bringing dies with convex forming surfaces, when viewed from the side of the transfer line of the material 1, close to the transfer line from above and below the material 1, in synchronism with each other, while giving the dies a swinging motion in such a manner that the portions of the forming surfaces of the dies, in contact with the material 1, are transferred from the upstream to the downstream side in the direction of the transfer line.

Abstract: A material 1 to be shaped is reduced and formed by bringing dies with convex forming surfaces, when viewed from the side of the transfer line of the material 1, close to the transfer line from above and below the material 1, in synchronism with each other, while giving the dies a swinging motion in such a manner that the portions of the forming surfaces of the dies, in contact with the material 1, are transferred from the upstream to the downstream side in the direction of the transfer line.

Abstract: A material 1 to be shaped is reduced and formed by bringing dies with convex forming surfaces, when viewed from the side of the transfer line of the material 1, close to the transfer line from above and below the material 1, in synchronism with each other, while giving the dies a swinging motion in such a manner that the portions of the forming surfaces of the dies, in contact with the material 1, are transferred from the upstream to the downstream side in the direction of the transfer line.

Abstract: A high-quality hot rolled steel sheet is manufactured with a high production efficiency and a low cost, from a long, hot slab, using a combination of continuous casting facilities and a plate reduction press machine.

Abstract: A material 1 to be shaped is reduced and formed by bringing dies with convex forming surfaces, when viewed from the side of the transfer line of the material 1, close to the transfer line from above and below the material 1, in synchronism with each other, while giving the dies a swinging motion in such a manner that the portions of the forming surfaces of the dies, in contact with the material 1, are transferred from the upstream to the downstream side in the direction of the transfer line.

Abstract: A material 1 to be shaped is reduced and formed by bringing dies with convex forming surfaces, when viewed from the side of the transfer line of the material 1, close to the transfer line from above and below the material 1, in synchronism with each other, while giving the dies a swinging motion in such a manner that the portions of the forming surfaces of the dies, in contact with the material 1, are transferred from the upstream to the downstream side in the direction of the transfer line.

Abstract: The die changing apparatus for a plate reduction press machine, comprises an upper die support holder 28a and a lower die support holder 28b that are arranged vertically on opposite sides of a transfer line, and support holder guide rails 31 installed on the upper die support holder and extending substantially horizontally in the lateral direction of the transfer line, and an upper die 29a and a lower die 29b are mounted on the upper and lower die support holders, respectively using the rollers onto the dies, fixing devices 30 that fix the upper and lower dies on the upper and lower die support holders, respectively, die fastening members 38 which are placed on each side of the upper and lower dies, opposite each other in such a manner that they can be fastened to both dies, and a die changing mechanism that can move one of the die fastening members in a direction perpendicular to the transfer line.

Abstract: A method and hot rolling apparatus for producing a hot rolled steel sheet include a roughing rolling mill to roughing roll a heated slab into a sheet bar, at least one solenoid-type induction heater arranged for re-heating the sheet bar over its entire width, and a finish rolling mill arranged to finish roll the re-heated sheet bar into a hot rolled steel sheet having a predetermined thickness. An initial temperature before rolling is set to be low, and re-heating of the sheet bar is carried out around the middle of the hot rolling apparatus. The thermal energy required for rolling is thereby reduced as a whole without damaging the quality of the resulting hot rolled steel sheet. A descaling apparatus is provided prior to the finish rolling mill to remove oxide scales on surfaces of the sheet bar, whereby the resulting hot rolled steel sheet is free of scale flaws and exhibits superior surface properties.

Abstract: Making method of hot-rolled steel sheet comprises rough rolling a slab into a rough bar, heating the rough bar, guiding the rough bar with side guides and finish rolling the rough bar. The apparatus comprises a rough rolling mill, a heating device for heating the rough bar, side guides for guiding the rough bar and a finish rolling mill.

Abstract: The present invention relates to a warm rolling facility suited to rolling of brittle strip coils such as high Si steels. The facility is provided with a rolling machine, tension reels disposed respectively at an inlet side and an outlet side of the rolling machine, deflector rolls between each of the tension reels and the rolling machine. The tension reels are positioned in warming furnaces having heating means, and the rolls and the deflector rolls are provided with means for heating the rolls. Further, the rolling machine is provided at its inlet and outlet with heating apparatuses for heating the strip.

Abstract: The present invention relates to a lubricating method for warm rolling of high Si steel, where warm rolling is carried out on the high Si steel at temperatures between 200.degree. and 600.degree. C., while a lubricant is sprayed to working rolls or assistant rolls, the lubricant having been produced by mixing a solid lubricant endurable to rolling temperatures into a heat resistant grease.

Abstract: The present invention relates to a process for making non-oriented high Si steel sheet without problems during the sequence from the step of making molten steel to the step of rolling to final sheet thickness. An ingot (or a continuously cast piece) of high Si steel (containing 4.0 to 7.0% Si and specified with Al, Mn, C and P) is subjected to slabbing-hot rolling (or else directly slab rolling-hot rolling) and subsequently the hot rolled steel is reduced to thin thickness. The steel material is maintained at temperature of more than a determined temperature from the step of making molten steel to the step of hot rolling. In the step of hot rolling, information regarding finish rolling conditions and coiling conditions is used to provide structure suitable for the subsequent thin rolling. The hot rolled steel is then warm-rolled to the required thickness.

Abstract: The present invention relates to a warm rolling method for high Si steel strips, in which the steel strip is connected at both ends with leader strips which are excellent in cold or warm workability, and the ends of the leader strips are connected to tension reels for undertaking warm rolling on the steel strip. Whereby the leader strips are passed through rolls, the rolls can be preheated, and further whereby the both tension reels are disposed within warming furnaces and at least one of the leader strips is made longer than a distance between the tension reels, recovery treatment between passes can be carried out on the steel strip in the full length.