Disclosed herein are gas control systems and associated methods of controlling gas in a mold in casting, such as aluminum casting. The system may have a first mass controller, a second mass controller, and a control device capable of switching the gas control system between a first operating state and a second operating state. The first mass controller and the second mass controller may have different flow rate ranges. In the first operating state, the gas control system may deactivate one of the first or second mass controllers, and in the second operating state, the gas control system may activate both first and second mass controllers.

A support unit for a roll shaft of a continuous casting guide roll includes a housing having first axial end face, a second axial end face and a through-opening extending from the first axial end face to the second axial end face, a first cover connected to the first axial end face, a first primary isolator arranged radially between the first cover and the roll shaft, and a bearing in the through opening. On a first side of the bearing, a first closed space is partially defined by the bearing, the first cover and the first primary isolator, and the first closed space is pre-filled with a lubricant.

A support unit for a roll shaft of a continuous casting guide roll includes a housing having first axial end face, a second axial end face and a through-opening extending from the first axial end face to the second axial end face, a first cover connected to the first axial end face, a first primary isolator arranged radially between the first cover and the roll shaft, and a bearing in the through opening. On a first side of the bearing, a first closed space is partially defined by the bearing, the first cover and the first primary isolator, and the first closed space is pre-filled with a lubricant.

A method of producing an exothermic mold powder in a form of sprayed granules of the present invention includes spray-drying into granules, an aqueous slurry containing: a raw material blend; and a metal silicon powder and/or a silicon alloy powder, the method comprising adjusting the pH of the aqueous slurry to 13 or less.

There is provided a method of continuous casting two or more long products using a single continuous twin casting strand (CCM) comprising two sub-strands. The process control of the method is automatic and comprises master/slave logic. wherein one sub-strand of the twin casting strand is a master sub-strand and remaining sub-strand(s) are slave sub-strand(s). The master strand has non-controlled metal flow and liquid metal level in the master sub-strand is regulated by adjusting casting speed. The liquid metal level in said slave strand(s) is regulated by adjusting the liquid metal pouring rate.

There is provided a method of continuous casting two or more long products using a single continuous twin casting strand (CCM) comprising two sub-strands. The process control of the method is automatic and comprises master/slave logic. wherein one sub-strand of the twin casting strand is a master sub-strand and remaining sub-strand(s) are slave sub-strand(s). The master strand has non-controlled metal flow and liquid metal level in the master sub-strand is regulated by adjusting casting speed. The liquid metal level in said slave strand(s) is regulated by adjusting the liquid metal pouring rate.

An ingot mould for continuous casting, with a lubricant channel (2) opening to the running surface (1), has a distribution portion (3) adjoining the running surface (1). In an ingot mould of the aforementioned type a uniform lubrication of the running surface of the ingot mould is possible using as few wear-susceptible components as possible, where the flow resistance within the distribution portion (3) increases in the direction of the running surface (1) and is constant in a discharge region (4) of the distribution portion (3) adjoining the running surface parallel to the running surface (1).

An ingot mould for continuous casting, with a lubricant channel (2) opening to the running surface (1), has a distribution portion (3) adjoining the running surface (1). In an ingot mould of the aforementioned type a uniform lubrication of the running surface of the ingot mould is possible using as few wear-susceptible components as possible, where the flow resistance within the distribution portion (3) increases in the direction of the running surface (1) and is constant in a discharge region (4) of the distribution portion (3) adjoining the running surface parallel to the running surface (1).

Provided is a device for preparing a large-sized high-quality aluminium alloy ingot, which is mainly composed of a uniform cooler, a hot top, an oil-gas lubrication mold, an induction coil and a dummy ingot, wherein the hot top is arranged above the oil-gas lubrication mold, the induction coil is arranged outside the oil-gas lubrication mold, the uniform cooler is arranged inside the oil-gas lubrication mold, and the dummy ingot is arranged below the oil-gas lubrication mold. Further provided is a method for preparing a large-sized high-quality aluminium alloy ingot. The device combines a partitioned gas supply mold with the uniform cooler and an electromagnetic stirrer, and the effective coupling of the three achieves forced and uniform solidification forming of a melt under gas pressure contact conditions, such that a stable and continuous gas film is formed between the melt and the mold. The ingot has a smooth surface, and a fine and uniform internal structure.

Provided is a device for preparing a large-sized high-quality aluminium alloy ingot, which is mainly composed of a uniform cooler, a hot top, an oil-gas lubrication mold, an induction coil and a dummy ingot, wherein the hot top is arranged above the oil-gas lubrication mold, the induction coil is arranged outside the oil-gas lubrication mold, the uniform cooler is arranged inside the oil-gas lubrication mold, and the dummy ingot is arranged below the oil-gas lubrication mold. Further provided is a method for preparing a large-sized high-quality aluminium alloy ingot. The device combines a partitioned gas supply mold with the uniform cooler and an electromagnetic stirrer, and the effective coupling of the three achieves forced and uniform solidification forming of a melt under gas pressure contact conditions, such that a stable and continuous gas film is formed between the melt and the mold. The ingot has a smooth surface, and a fine and uniform internal structure.