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US 12,157,165 B2Granted
Continuous casting process of metal
AssigneeArcelorMittal
InventorsMathieu Brandt, Jean-Paul Fischbach, Paul Naveau
Life of this patent
Estimating the term…
Abstract
A continuous casting process of a steel semi-product is provided. The process includes a step of casting using a hollow jet nozzle located between a tundish and a continuous casting mould. The nozzle includes, in its upper part, a dome for deflecting the liquid metal arriving at the inlet of the nozzle towards the internal wall of the nozzle, defining an internal volume with no liquid metal. A simultaneous step of injecting powder through a hole of the dome occurs. The powder has a particle size of 200 μm or less. The dome includes a first device to inject the powder without any contact with the dome and a second device to avoid sticking or sintering of the powder onto the first device.
Claims16
A continuous casting process of a steel semi-product comprising the steps of:
- casting, using a hollow jet nozzle located between a tundish and a continuous casting mould, the nozzle including, in an upper part, a dome for deflecting liquid metal arriving at an inlet of the nozzle towards an internal wall of the nozzle, thereby defining an internal volume with no liquid metal;
- and
- injecting, simultaneously, powder through a hole of the dome, the powder having a particle size of 200 μm or less, the dome including a first device to inject the powder without any contact with the dome, the first device including a hollow body passing through the hole of the dome, said hollow body having a double wall,
- the double wall further comprising an internal wall, the powder being in contact with an internal surface of the internal wall during the injecting;
- an outer wall of the double wall being made of one material and having an external surface, the external surface of the outer wall being arranged away from an inner surface of the hole of the dome, the external surface of the outer wall and the inner surface of the hole of the dome delimiting between them a space,
- circulating a cooling gas inside the double wall via an inlet on an end of the double wall during the injecting, the cooling gas circulating in the double wall with a flow rate ranging from 10 to 30 m3/h, the circulation of the gas avoiding sticking or sintering of said powder onto the internal wall of the double wall;
- and
- exhausting the cooling gas from the double wall via an outlet on said end of the double wall, during the injecting.
5 more elements
A continuous casting process of a steel semi-product comprising the steps of:
- casting, using a hollow jet nozzle located between a tundish and a continuous casting mould, the nozzle including, in an upper part, a dome for deflecting liquid metal arriving at an inlet of the nozzle towards an internal wall of the nozzle, thereby defining an internal volume with no liquid metal,
- injecting, simultaneously, powder through a hole of the dome, the powder having a particle size of 200 μm or less, the dome including a first device to inject the powder without any contact with the dome, the first device including a hollow body passing through the hole of the dome, said hollow body having a double wall, the first device being surrounded by an insulating layer, the insulating layer being a thermal barrier between the hollow body and the dome, the insulating layer being in contact with an inner surface of the hole of the dome,
- circulating a cooling gas inside the double wall via an inlet on an end of the double wall during the injecting, the cooling gas circulating in the double wall with a flow rate ranging from 10 to 30 m3/h, the circulation of the gas avoiding sticking or sintering of said powder onto the double wall.
A continuous casting process of a steel semi-product comprising the steps of:
- casting, using a hollow jet nozzle located between a tundish and a continuous casting mould, the nozzle including, in an upper part, a dome for deflecting liquid metal arriving at an inlet of the nozzle towards an internal wall of the nozzle, thereby defining an internal volume with no liquid metal;
- and
- injecting, simultaneously, powder through a hole of the dome, the powder having a particle size of 200 μm or less, the dome including a first device to inject the powder without any contact with the dome, the first device including a hollow body having a double wall comprising an internal wall and an outer wall, an external surface of the internal wall and an internal surface of the outer wall defining a gas input channel and a gas outlet channel, the first device passing through the hole of the dome,
- the powder being in contact with an internal surface of the internal wall during the injecting;
- the outer wall of the double wall being made of one material and having an external surface, the external surface of the outer wall being arranged away from an inner surface of the hole of the dome, the external surface of the outer wall and the inner surface of the hole of the dome delimiting between them a space;
- circulating a cooling gas in the gas input channel in a first direction;
- and
- circulating the cooling gas in the gas outlet channel in a second direction opposite to the first direction, the cooling gas circulating in the gas input channel and in the gas outlet channel with a flow rate ranging from 10 to 30 m3/h, the circulation of the gas avoiding sticking or sintering of said powder onto the internal wall of the double wall.
5 more elements
Dependencies are inferred from the claim text.