This thin strip manufacture method is a thin strip manufacture method for manufacturing a thin strip by supplying molten steel to a molten steel pool formed by a pair of rotating cooling drums and a pair of side weirs to form and grow a solidified shell on a peripheral surface of the cooling drums, wherein a pressing force P of the pair of the cooling drums is set so that the pressing force P (kgf/mm) of the pair of cooling drums, casting thickness D (mm), and radius R (m) of the cooling drums satisfy 0.90≤P×(D×R).sup.0.5≤1.30.

This thin strip manufacture method is a thin strip manufacture method for manufacturing a thin strip by supplying molten steel to a molten steel pool formed by a pair of rotating cooling drums and a pair of side weirs to form and grow a solidified shell on a peripheral surface of the cooling drums, wherein a pressing force P of the pair of the cooling drums is set so that the pressing force P (kgf/mm) of the pair of cooling drums, casting thickness D (mm), and radius R (m) of the cooling drums satisfy 0.90≤P×(D×R).sup.0.5≤1.30.

This hot-rolled steel sheet has a predetermined chemical composition and predetermined metallographic structure, a ratio between a maximum depth of a region where, on one surface, a rotation angle between a normal line of the one surface and a (011) pole near the normal line of the one surface is 5° or less and a maximum depth of a region where, on the other surface, a rotation angle between a normal line of the other surface and a (011) pole near the normal line of the other surface is 5° or less is 1.00 to 1.20, and a tensile strength is 1150 MPa or more.

A metal casting system includes a master conveyor, a slave conveyor, a cutting device, and a control system. The master conveyor includes a first belt and a first motor, and the slave conveyor is separated from the master conveyor and includes a second belt and a second belt. The cutting device is between the master conveyor and the slave conveyor and selectively cuts a metal product that is conveyed by the master conveyor and the slave conveyor. The control system includes a sensor that detects ends of sections of the metal product as the sections of the metal product move in a downstream direction. The control system also includes a controller communicatively coupled with the sensor. The controller selectively controls at least one of the first motor or the second motor based on the detected ends from the sensor.

Disclosed is a cold-rolled and annealed dual-phase steel having a tensile strength of greater than 780 MPa. A matrix structure thereof is fine and uniform martensite+ferrite. The cold-rolled and annealed dual-phase steel contains the following chemical elements in the following mass percentages: C: 0.1%-0.13%, Si: 0.4%-0.8%, Mn: 1.65%-1.9%, Al: 0.01%-0.05%, Nb: 0.01-0.03%, and Ti: 0.01-0.03%. Furthermore, the cold-rolled annealed dual-phase steel does not contain the elements Cr or Mo. In addition, also disclosed is a method for manufacturing the cold-rolled and annealed dual-phase steel, comprising smelting and continuous casting, hot rolling, cold rolling, annealing, tempering and flattening. The cold-rolled and annealed dual-phase steel of the present invention is not only economical, but also has the characteristics of high strength, excellent elongation and cold bending properties.

Disclosed is a cold-rolled and annealed dual-phase steel having a tensile strength of greater than 780 MPa. A matrix structure thereof is fine and uniform martensite+ferrite. The cold-rolled and annealed dual-phase steel contains the following chemical elements in the following mass percentages: C: 0.1%-0.13%, Si: 0.4%-0.8%, Mn: 1.65%-1.9%, Al: 0.01%-0.05%, Nb: 0.01-0.03%, and Ti: 0.01-0.03%. Furthermore, the cold-rolled annealed dual-phase steel does not contain the elements Cr or Mo. In addition, also disclosed is a method for manufacturing the cold-rolled and annealed dual-phase steel, comprising smelting and continuous casting, hot rolling, cold rolling, annealing, tempering and flattening. The cold-rolled and annealed dual-phase steel of the present invention is not only economical, but also has the characteristics of high strength, excellent elongation and cold bending properties.

Steam exhaust ports are located around a perimeter of a direct chill casting pit, at various locations from below the top of the pit to the pit bottom to rapidly remove steam from the casting pit with addition of dry excess air. Gas introduction ports are also located around a perimeter of the casting pit and configured to introduce an inert gas into the casting pit interior.

Steam exhaust ports are located around a perimeter of a direct chill casting pit, at various locations from below the top of the pit to the pit bottom to rapidly remove steam from the casting pit with addition of dry excess air. Gas introduction ports are also located around a perimeter of the casting pit and configured to introduce an inert gas into the casting pit interior.

Metal sheets (13) are produced from strand-shaped profiles (8) having a low thickness, made of magnesium or magnesium alloys by way of an extrusion system (1). The open or closed extruded profile (8) exiting the extrusion die (6-7) of an extrusion press (1) is shaped to obtain a flat metal sheet (13) and is then subjected to a defined shaping process by way of stretch-forming. The system for carrying out the method is essentially composed of an extrusion press (1) comprising a die plate generating the extruded profile and a shaping unit (5) following the die plate, wherein the shaping unit (5) is composed of a severing unit (2), a bending unit (3), and an unrolling unit (4).

A method of removing a crack in a metallic material during a metal making process. The method including: determining the presence of a crack and its crack depth during the metal making process by a crack detecting unit utilizing inductive measurement, sending a crack detection signal and crack depth to a crack removal unit arranged on known distance from the crack detecting unit, the crack removal unit including an ejector configured to eject a carving means, and to vary the intensity of the ejected carving means, removing the detected crack by activating the ejector based on the crack detection signal with an intensity of the ejected carving means based at least on the crack depth.