Abstract: A method for making alloy strip by continuous casting with tensile strength of at least 900 MPa and total elongation of at least 30%, strip with tensile strength of at least 1200 MPa and total elongation of at least 20%, or strip with tensile strength of at least 1500 MPa and total elongation of at least 15%. Molten metal is introduced forming a casting pool supported on the casting rolls and counter-rotating the A heat flux is provided with a peak heat flux >20 Mw/m2. The strip is cooled at 1000-3000 K/sec. A roll biasing force >40 kN/meter of casting roll length is applied to form thin metal strip. The strip is then conveyed through a first enclosure with an atmosphere having an oxygen content of <5%. The cast strip is rolled through a rolling mill and reduced and modification of the microstructure is initiated.

Abstract: In a twin roll continuous caster, the contour of the strip cast is controlled during casting by regulating the temperature of temperature-regulating medium circulated through temperature-regulating passages in the casting rolls spaced inward of cooling passages in the circumferential portion adjacent the casting surfaces. The temperature-regulating passages may be positioned in the circumferential portion or in the inner portion of the casting rolls, or both.

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: In a twin roll continuous caster, the contour of the strip cast is controlled during casting by regulating the temperature of temperature-regulating medium circulated through temperature-regulating passages in the casting rolls spaced inward of cooling passages in the circumferential portion adjacent the casting surfaces. The temperature-regulating passages may be positioned in the circumferential portion or in the inner portion of the casting rolls, or both.

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 metal strip casting apparatus and method of casting metal strip include assembling a pair of counter-rotatable casting rolls positioned laterally forming a nip between for casting, and assembling a pair of brush rolls, each of the brush rolls associated with one of each of the casting rolls. Each brush roll includes at least one spaced apart brush line extending substantially along the axial length of the casting roll. The brush lines may form a spiral, zigzag, wave or crisscross array about the brush roll. The brush roll may include one or more staggered rings with regularly or irregularly spaced apart bristles which form the brush lines. The brush lines may be between 10 to 50 mm apart and separated by between 2 mm to 45 mm of open space. The brush lines may be one line per 10 mm to 90 mm of axial length of brush roll.

Abstract: In twin roll casting of steel strip, molten steel is introduced into the nip between parallel casting rolls to create a casting pool supported on casting surfaces of the rolls and the rolls are rotated to deliver solidified strip downwardly from the nip. Casting surfaces are textured by a random pattern of discrete projections, which may have an average surface distribution of between 5 and 200 peaks per mm2 and an average height of at least 10 microns. In order to suppress chatter defects, the molten steel also has manganese content of at least 0.55% by weight and a silicon content in the range of 0.1 to 0.35% by weight. The strip is thus capable of moving away from the casting pool at a speed of more than 60 meters per minute without substantial high speed chattering defects.

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 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 for casting metal strip by controlling the distance between the confining side plates confining the casting pool and the outer nozzle ends of discrete nozzle pieces of the delivery nozzle delivering the molten melt. The nozzle pieces defining the outer nozzle ends may be moved and control separately from the position of the confining plates, or with the position of the confining plates, by a nozzle delivery drive. The distance between the outer nozzle ends and the confining plates may be set before casting and maintained during casting with wear and thermal expansion of the confining plates, nozzle pieces, or both, or varied during the casting operation, to inhibit the formation of skulls in the casting pool and the formation of “snake eggs” in the cast strip.

Abstract: In twin roll casting of steel strip, molten steel is introduced into the nip 16B between parallel casting rolls to create casting pool supported on casting surfaces of the rolls and the rolls are rotated to deliver solidified strip downwardly from the nip. Casting surfaces are textured by a random pattern of discrete projections, which may have an average surface distribution of between 5 and 200 peaks per mm2 and an average height of at least 10 microns. In order to suppress chatter defects, the molten steel also has manganese content of at least 0.55% by weight and a silicon content in the range of 0.1 to 0.35% by weight. The strip is thus capable of moving away from the casting pool at a speed of more than 60 meters per minute without substantial high speed chattering defects.

Abstract: Thin steel strip is passed through a pinch roll stand comprising pinch rolls to a rolling mill comprising a pair of work rolls and upper and lower backing rolls. Strip passes through the bite between the work rolls and strip squeezing forces are applied between the work rolls to reduce the thickness of the strip. The pinch rolls apply tension to the strip passing to the work rolls. In order to minimize generation of crimping defects in the strip, the tension applied by the pinch rolls is high enough to ensure no part of the strip entering the work rolls is in longitudinal compression such as to exceed the buckling stress of the strip. The applied tension is sufficiently low as to produce no more than 1% strip elongation through creep. The strip may be hot rolled by the work rolls at a temperature in the range of 700° C.–1200° C.

Abstract: In twin roll casting of steel strip, molten steel is introduced into the nip 16B between parallel casting rolls to create casting pool supported on casting surfaces of the rolls and the rolls are rotated to deliver solidified strip downwardly from the nip. Casting surfaces are textured by a random pattern of discrete projections, which may have an average surface distribution of between 5 and 200 peaks per mm2 and an average height of at least 10 microns. In order to suppress chatter defects, the molten steel also has manganese content of at least 0.55% by weight and a silicon content in the range of 0.1 to 0.35% by weight. The strip is thus capable of moving away from the casting pool at a speed of more than 60 meters per minute without substantial high speed chattering defects.

Abstract: Twin roll caster for casting thin steel strip comprises chilled casting rolls mounted on carriers. One roll is fixed and the other is moveable laterally and biased toward the other roll by carrier drive units acting on the moveable roll carriers. A casting pool of molten steel is supported on the rolls which are rotated to produce a solidified steel strip delivered downwardly from the nip therebetween. A substantially constant gap is maintained between the rolls such that unsolidifed molten metal passes through the nip between the solidified shells of the forming strip and solidifies below the nip. The carrier drive units are effective to apply to the biased roll substantially constant and low biasing forces, which may be between the same and slightly more than the force required to balance the hydrostatic pressure of the casting pool and to overcome the mechanical friction involved in moving the biased roll.

Abstract: Apparatus and method for casting metal strip by controlling the distance between the confining side plates confining the casting pool and the outer nozzle ends of discrete nozzle pieces of the delivery nozzle delivering the molten melt. The nozzle pieces defining the outer nozzle ends may be moved and control separately from the position of the confining plates, or with the position of the confining plates, by a nozzle delivery drive. The distance between the outer nozzle ends and the confining plates may be set before casting and maintained during casting with wear and thermal expansion of the confining plates, nozzle pieces, or both, or varied during the casting operation, to inhibit the formation of skulls in the casting pool and the formation of “snake eggs” in the cast strip.

Abstract: An apparatus for casting metal strip in which molten metal is applied to a casting roll the surface of which is cleaned by a cleaning brush device comprising a main brush extending across the roll surface by sweeper brush actuator 28A and a sweeper brush extending across the roll and capable of tangentially engaging the peripheral longitudinal roll surface in advance of the main brushing device. Both brushes are mounted on mounting frames moveable to bring the main and sweeper brushes into contact with the casting roll. The sweeper brush is independently moveable on the frame by operation of an sweeper brush actuator to move the sweeper brush into engagement with the surface of the casting roll near the start and end of the casting run and the main brush actuator to move the main brush into engagement with the peripheral longitudinal surface of the casting roll during normal casting operation.

Abstract: A steel strip is produced having a tensile strength of at least 680 MPa but is such that the total elongation to break off of the strip after annealing is in the range 9% to 12%. Cold rolling may produce a cold reduction of the strip thickness in the range 40% to 80%. The continuously cast strip may be optionally in-line hot rolled prior to coiling to produce an initial strip thickness in the range 40% to 60%.

Abstract: Twin roll strip caster comprising parallel casting rolls one of which is mounted on moveable roll supports which allow it to move bodily toward and away from the other roll. A pair of roll biasing units comprising compression act on roll supports to bias the moving roll toward the other roll. Biasing units comprise compression springs acting on roll supports through thrust transmission structures and thrust reaction structures. The positions of thrust reaction structures are set by hydraulic cylinder units operable to vary the position of each reaction structure to replicate movements of the respective thrust transmission structure so as to maintain a constant compression of the biasing springs regardless of lateral movements of the roll supports.