Abstract: A method of casting metal strip and equipment therefor where an elongated metal delivery nozzle extending along in a continuous caster with at least one segment having a main portion adapted to deliver molten metal in the casting pool above the nip along the metal delivery nozzle and an end portion adjacent side dams having a reservoir portion with first and second passages adapted to deliver molten metal into a molten metal pool adjacent the side dams while shells are forming on the casting rolls. The first passages are adapted to deliver molten metal shallowly into the casting pool adjacent the side dams, and the second passages adapted to deliver molten metal deeper into the casting pool than the first passages adjacent the side dams to inhibit formation of skulls during the formation of the cast strip during a casting campaign.

Abstract: Described herein is a twin roll caster including a pair of casting rolls arranged parallel to one another with a gap between the casting rolls and side dams parallel to one another forming a pool between the casting rolls and side dams. A side dam support is provided that applies a compression force on at least one of the side dams at a compression angle relative to the axis of the casting rolls.

Abstract: Described herein is a twin roll caster including a pair of casting rolls arranged parallel to one another with a gap between the casting rolls and side dams parallel to one another forming a pool between the casting rolls and side dams. A side dam support is provided that applies a compression force on at least one of the side dams at a compression angle relative to the axis of the casting rolls.

Abstract: A roll polishing apparatus that can suppress cracks on a strip. The roll polishing apparatus includes brush rolls which face outer periphery of chilled rolls over an axial length of the chilled rolls, respectively, cylinders which urge the brush rolls wholly to the chilled rolls, respectively, and cylinders which deform the brush rolls in conformity to crowns of the chilled rolls, respectively. By these elements, wires of the brush rolls are uniformly contacted on outer peripheries of the chilled rolls to wipe off oxides adhering to the outer peripheries of the chilled rolls.

Abstract: A casting roll having an outer periphery capable of being efficiently cooled is disclosed. The casting roll has a roll body on which side weirs abut, short tube-shaped supports each coaxially with and protruding from the roll body, a stub axle fitted into the support, a sleeve fitted over the support and a flange contiguous with the stub axle and abutting on the sleeve on a side away from the roll body. The roll body is formed with longitudinal cooling passages passing through the roll from one end to the other end of the roll as well as radial cooling passages each adjacent to a corresponding end of the roll and extending from an inner periphery of the roll to a corresponding longitudinal cooling passage. A plug is fitted into each end of the longitudinal cooling passages and abuts on the sleeve. With a distance between the longitudinal cooling passages and the outer periphery of the roll body being reduced as much as possible, cooling water is passed through a portion of the roll body.

Abstract: A twin roll caster including chilled rolls, side weirs, and a molten-metal delivery nozzle. Baffles, contiguous with bottoms of end faces of the nozzle, project in a casting pool toward the side weirs to suppress stream of the molten metal into a nip between the rolls. Thus, hot molten metal just after poured into the pool does not instantly reach the nip along the side weirs, and molten metal decreases in temperature with lapse of time after the pouring streams into the nip as the rolls are rotated. As a result, belated formation of solidified shells at and adjacent to outer circumferential edges of the chilled rolls is eliminated. Thus, a strip delivered from the nip between the rolls has no reduced thickness at regions adjacent to lateral edges of the strip and has uniform thickness throughout the width of the strip.

Abstract: A casting roll having an outer periphery capable of being efficiently cooled is disclosed. The casting roll has a roll body on which side weirs abut, short tube-shaped supports each coaxially with and protruding from the roll body, a stub axle fitted into the support, a sleeve fitted over the support and a flange contiguous with the stub axle and abutting on the sleeve on a side away from the roll body. The roll body is formed with longitudinal cooling passages passing through the roll from one end to the other end of the roll as well as radial cooling passages each adjacent to a corresponding end of the roll and extending from an inner periphery of the roll to a corresponding longitudinal cooling passage. A plug is fitted into each end of the longitudinal cooling passages and abuts on the sleeve. With a distance between the longitudinal cooling passages and the outer periphery of the roll body being reduced as much as possible, cooling water is passed through a portion of the roll body.

Abstract: A roll polishing apparatus that can suppress cracks on a strip. The roll polishing apparatus includes brush rolls which face outer periphery of chilled rolls over an axial length of the chilled rolls, respectively, cylinders which urge the brush rolls wholly to the chilled rolls, respectively, and cylinders which deform the brush rolls in conformity to crowns of the chilled rolls, respectively. By these elements, wires of the brush rolls are uniformly contacted on outer peripheries of the chilled rolls to wipe off oxides adhering to the outer peripheries of the chilled rolls.

Abstract: Intended is to provide a casting roll having an outer periphery capable of being efficiently cooled. The casting roll has a roll body on which side weirs 11 abut, short tube-shaped supports 13 each coaxially with and protruding from the roll body 12, a stub axle 14 fitted into the support 13, a sleeve 15 fitted over the support 13 and a flange 16 contiguous with the stub axle 14 and abutting on the sleeve 15 on a side away from the roll body 12. The roll body 12 is formed with longitudinal cooling passages 17 passing through the roll from one end to the other end of the roll as well as radial cooling passages 18 each adjacent to a corresponding end of the roll and extending from an inner periphery of the roll to a corresponding longitudinal cooling passage 17. A plug 19 is fitted into each end of the longitudinal cooling passages 17 and abuts on the sleeve 15.

Abstract: A twin roll caster including a pair of chilled rolls on which molten steel solidifies for delivery of a steel strip from a nip between the rolls, a noncontact type sensor for measuring thickness distribution of the strip widthwise of the strip, a marking mechanism that makes a mark on the strip whenever the chilled rolls make one rotation, a mark detector that senses the marks on the strip, and a nip estimating mechanism. From thickness-distribution information by the sensor and passed-mark information by the mark detector, the nip estimating mechanism calculates variation of the nip between the rolls whenever the rolls make one rotation, based on variation in thickness distribution widthwise of the strip between confirmed passing of the mark and confirmed passing of the next mark, and stores the same as data.

Abstract: A twin roll caster including chilled rolls, side weirs, and a molten-metal delivery nozzle. Baffles, contiguous with bottoms of end faces of the nozzle, project in a casting pool toward the side weirs to suppress stream of the molten metal into a nip between the rolls. Thus, hot molten metal just after poured into the pool does not instantly reach the nip along the side weirs, and molten metal decreases in temperature with lapse of time after the pouring streams into the nip as the rolls are rotated. As a result, belated formation of solidified shells at and adjacent to outer circumferential edges of the chilled rolls is eliminated. Thus, a strip delivered from the nip between the rolls has no reduced thickness at regions adjacent to lateral edges of the strip and has uniform thickness throughout the width of the strip.

Abstract: A sealing device for a main roller coaster including a transition piece positioned above a melt pool formed between chilled rolls, rotatable cylindrical brushes extending axially of the rolls and each abutting against an outer periphery of the corresponding roll all over an axial length thereof on a side away from the pool and below the transition piece, first cowlings each covering the roll in between the transition piece and the brush, second cowlings each surrounding a portion of the brush not in contact with the roll, third cowlings each covering the roll below the brush and outlets for feeding sealing gas to between the transition piece and the rolls, the sealing gas from the outlets filling up to outlet portions of the third cowlings.

Abstract: A twin roll caster with the casting roll having longitudinal cooling channels extending from one shoulder portion, adjacent a side dam, to the other shoulder portion, adjacent the opposite side dam. The molten metal pool is confined by side dams that may engage the end surfaces of the shoulder portions.

Abstract: A twin roll casting machine and method of continuously casting thin strip that enables the manufacture of thin strip by applying a thrust force through casting roll support structures on each casting roll to bias the casting rolls together, such that a majority portion of the thrust force counterbalances ferrostatic pressure. Cooling water is caused to flow through rotary joints (10) that are attached to one or both of the ends of casting rolls (1). The rotary joints at each casting roll cause cooling water to flow into and from the passages in the casting rolls and exert forces on the casting rolls generally in the direction along the rotational axis of the casting rolls.

Abstract: A nozzle end is provided with an extension 11 which has a lower portion immersed in a molten metal pool and extends toward a side weir 2 such that a stagnation area disappears on a free liquid surface of molten metal. The extension 11 is in the form of a quadrangular pyramid lying sidelong and is converged to a point P1 extremely close to the side weir 2. According to this molten metal feed nozzle, a stagnation area on a free liquid surface of molten metal is displaced by the extension 11 contiguous with the nozzle end to suppress generation of an unwanted solidification shell. Thus, no unwanted solidification shell is pinched as foreign matter by solidification shells generated on outer peripheries of chilled rolls 1 for production of a strip and break of a strip derived from enlargement of nip between the rolls can be averted.

Abstract: A method of controlling the formation of crocodile skin surface roughness on thin cast strip of plain carbon steel forming a casting pool of molten metal of plain carbon steel of less than 0.065% carbon supported on a casting surfaces above a nip, assembling a rotating brush to contact the casting surfaces in advance of contact with the molten metal, and controlling the energy exerted by rotating brushes against the casting surfaces of the casting rolls to clean and expose a majority of the projections of the casting surfaces of the casting rolls by provide wetting contact with the molten metal of the casting pool. The cleaning step may be done by controlling the energy of the rotating brush against the casting rolls based on the difference between the measured heat flux and the initially measured heat flux when the casting surfaces are clean, and automating the method.

Abstract: A twin roll casting machine and method of continuously casting thin strip that enables the manufacture of thin strip by applying a thrust force through casting roll support structures on each casting roll to bias the casting rolls together, such that a majority portion of the thrust force counterbalances ferrostatic pressure. Cooling water is caused to flow through rotary joints (10) that are attached to one or both of the ends of casting rolls (1). The rotary joints at each casting roll cause cooling water to flow into and from the passages in the casting rolls and exert forces on the casting rolls generally in the direction along the rotational axis of the casting rolls.

Abstract: A twin roll caster with the casting roll having longitudinal cooling channels extending from one shoulder portion, adjacent a side dam, to the other shoulder portion, adjacent the opposite side dam. The molten metal pool is confined by side dams that may engage the end surfaces of the shoulder portions.

Abstract: A method of controlling the formation of crocodile skin surface roughness on thin cast strip of plain carbon steel forming a casting pool of molten metal of plain carbon steel of less than 0.065% carbon supported on a casting surfaces above a nip, assembling a rotating brush to contact the casting surfaces in advance of contact with the molten metal, and controlling the energy exerted by rotating brushes against the casting surfaces of the casting rolls to clean and expose a majority of the projections of the casting surfaces of the casting rolls by provide wetting contact with the molten metal of the casting pool. The cleaning step may be done by controlling the energy of the rotating brush against the casting rolls based on the difference between the measured heat flux and the initially measured heat flux when the casting surfaces are clean, and automating the method.

Abstract: A method of controlling the formation of crocodile skin surface roughness on thin cast strip of plain carbon steel forming a casting pool of molten metal of plain carbon steel of less than 0.65% carbon supported on a casting surfaces above a nip, assembling a rotating brush to contact the casting surfaces in advance of contact with the molten metal, and controlling the energy exerted by rotating brushes against the casting surfaces of the casting rolls to clean and expose a majority of the projections of the casting surfaces of the casting rolls by provide wetting contact with the molten metal of the casting pool. The cleaning step may be done by controlling the energy of the rotating brush against the casting rolls based on the difference between the measured heat flux and the initially measured heat flux when the casting surfaces are clean, and automating the method.