High speed continuous casting device and relative method

A method of high speed continous casting to produce billets to be sent for rolling comprising:

• providing a high speed continous casting device for casting said billet, comprising
• an ingot mold provided with a crystalliser having side-walls between which a molten metal as it cools is suitable to take shape,
• an assembly, for guiding, containing and optionally pre-rolling, located downstream of said ingot mold, wherein assembly cooperates with secondary cooling means located in a secondary cooling zone located at the outlet of said crystallizer, and a primary cooling system associated with said side-walls, wherein a lower part of said crystalliser has a longitudinal development comprising a portion at least slightly curved with a radius of curvature (“R”) having a value at least five times more than the first radius of curvature of a first segment of said assembly, for guiding, containing and optionally pre-rolling, in the secondary cooling zone located at the outlet of said crystalliser, and
• wherein the length (L) of said walls is more than 1050 mm, so that a progressive and gradual deformation of said billet being formed is obtained which prevents tensions, inner cracks and surface lesions from forming thereon,
• progressively cooling said molten metal discharged inside said crystalliser of said ingot mold, said crystalliser being associated with said primary cooling syste,
• circulating cooling fluid in said primary cooling system, wherein said cooling fluid circulates in channels adjacent to the outer face of the wall of the crystallisers, or in through holes made in the thickness of the walls thereof, at a speed of between 12 and 28 meters per second.

A high speed continous casting device for metal products, comprising:

• an ingot mold provided with a crystalliser having side-walls,
• an assembly, for guiding, containing and optionally pre-rolling,
• wherein said assembly, for guiding, containing and optionally pre-rolling, is located downstream of said ingot mold and has a curved development to bring a casting billet from a substantially vertical casting position to a substantially horizontal position,
• a secondary cooling means associated with said assembly for guiding, containing and optionally pre-rolling, and
• a primary cooling system associated with said side-walls,
• wherein at least a lower part of said crystalliser has a longitudinal development at least slightly curved with a radius curvature (“R”) having a value at least five times greater than a radius of curvature of a first segment of the curved development of said assembly, for guiding, containing and optionally pre-rolling,
• wherein the crystalliser has a length (L) equal to at least 1050 mm, and
• wherein inner faces of the sidewalls have a converging tapered downward development with a tapering value related to detachment of skin of the product during cooling inside the crystalliser, and
• wherein the primary cooling system comprises chambers or longitudinal holes for circulation of cooling fluid for heat exchange with the molten metal.