Abstract:
PROBLEM TO BE SOLVED: To improve a mold or continuous casting operation in a continuous casting method and its apparatus. SOLUTION: In a thermal control method for a copper plate facing to steel of a continuous casting mold regarding different casting speeds, different copper plate thickness, different casting sizes, different water amount and different water pressure respectively, the method is characterized in that selectable mold cooling water temperature at an outlet of the mold is constantly maintained unrelated to a casting speed. Temperature of the outlet of the mold is measured and controlled by a two way type valve having a short pipe between the outlet of the mold and an inlet of the mold and a bifurcated pipe providing for partial amount of the cooling water from the outlet of the mold to a heat exchanger. Hot cooling water at the outlet of the mold is mixed with cooled water at the outlet of the mold, and cooling water amount and pressure of at the outlet of the mold, in which cooling water temperature is controlled dependent on casting condition, is also controlled. Then, molding cooling water at the outlet of the mold is circulated through the mold by a pump station so as to maintain constant temperature.
Abstract:
The invention relates to a continuous casting mould (1) for molten steel, consisting of highly thermally conductive plates (2), tubular sections (3) or similar with curved and/or straight peripheral sections (5; 6) or two straight peripheral sections (6), which adjoin one another, or are placed perpendicularly one on top of the other and are externally cooled. The surface heat flux of the peripheral sections can be evened out on the hot side (9) (and the cold side (10) ) by the fact that convex peripheral sections (8), which delimit the hot side, lie opposite similar concave peripheral sections (11) on the cold side (10) that have a continuously diminishing wall thickness (12) towards the centre of the section, or alternatively that concave peripheral sections (13) on the hot side (9) lie opposite similar concave peripheral sections (8) on the cold side (10), facing the hot side, said concave peripheral sections having a continuously increasing wall thickness (14) towards the centre of the section (8a).
Abstract:
Disclosed are a method and a device for continuously casting billets (1), among others, which are made of liquid metals, particularly steel materials. According to the invention, heat is removed in a primary cooling zone (4), further cooling taking place in a secondary cooling zone (7) with the aid of a dynamic spraying system (6) by means of nozzles (8) that impinge the width (9) and the metallurgical length (10a) of the billet while the heat distribution is determined and the surface temperature is measured by temporarily sampling the billet surface. The aim of the invention is to obtain a temperature curve which is advantageous for further processing across the entire cross section of the billet. Said aim is achieved by the fact that the dynamic spraying system (6) is functionally controlled in the form of the distribution of the water quantity and the pressure distribution or pulse distribution across the width (9) and length (10a) of the billet via the discharge temperature which is determined by verifying the surface temperature at the end (10b) of the metallurgical length (10a) of the billet so as to obtain a temperature curve (20) calculated for the billet length (10a) and/or the billet width (9).
Abstract:
The invention relates to a method for optimizing the cooling capacity of a continuous casting mold (1) for liquid metals, particularly for liquid steel, by homogenizing the thermal load (22) above the height of the continuous casting mold (1). According to the method, the cooling medium (5) is guided through a cross-sectional area of a large number of cooling medium channels (3) or cooling medium boreholes (4) running approximately parallel to the cast billet (9). The cooling medium cross-sectional areas between the mold entry (6) and the mold exit (7) are configured differently. In order to homogenize the thermal mold load (22), a smaller cross-sectional area sets the flow rate of the cooling medium (5), which is conducted from the top downward, inside the cooling medium channel (3) or inside the cooling medium borehole (4) higher in the upper area of the continuous casting mold (1) than in the lower area of the continuous casting mold (1) in which the flow rate is set lower by a larger cross-sectional area and/or the covering of the cooling medium is adjusted by a cross-sectional shape that varies from the top downward.
Abstract:
The invention relates to a method for the continuous casting of aluminum-killed steels by means of a water-cooled permanent mold. The steels are treated with Ca at the end of the secondary metallurgy treatment and the deoxidization products of the composition have between 40 and 60 % Al2O3 in the two-phase diagram Al2O3/Ca. According to the inventive casting method using a ceramic pipe, the heat conductivity is reduced by providing an additional insulation between the distributor bottom and the meniscus and the outer surface temperature of the submerged entry nozzle between the distributor bottom and the meniscus is increased to above > 700 DEG C. To this end, a ceramic casting pipe (1) is provided with an insulation (14) consisting of ceramic wool (14) with an outer surface temperature on the surface of the ceramic wool of
Abstract:
The invention relates to a device for cooling the copper plates (1.1) of a continuous casting ingot mould (1) for liquid metals, especially liquid steel, comprising an ingot mould coolant (2) which is guided in cooling channels. During the initial temperature rise to achieve a set casting speed or when said casting speed is exceeded for a deviating copper plate skin temperature (8), the copper plate skin temperature (8) is influenced, even when the casting speed is higher, in such a way that surface errors in the casting shell and/or cracks in the surface of the copper plates are prevented from occurring or occur in a significantly reduced manner by adjusting the copper plate skin temperature (8) at alternating casting speeds (6) of between 1 m / min and a maximum 12 m / min by means of quantitative correction of the amount of ingot mould coolant (4) and/or ingot mould coolant inflow temperature (5) according to the casting speed (6) and according to the thickness of the copper plates (9), to a desired constant value.
Abstract:
The invention relates to a method and device for continuously casting metal, particularly steel, whereby molten metal (6.1) is continuously cast in a cooled ingot mold with a casting speed (3) while forming a meniscus (7), and a cast product is continuously drawn out of the ingot mold in a direction of casting (3.1). The ingot mold, which has an ingot mold inlet (12) and an ingot mold outlet (8), is a water-cooled copper ingot mold having ingot mold cooling water channels (10.4) with a channel inlet and a channel outlet through which cooling water flows. Said water has an entry pressure p0 (15) at the channel inlet and an exit pressure p1 (15.1) at the channel outlet. The inventive method and device should be improved as to impede or prevent the high thermal load T of the ingot mold in the meniscus. To this end, the invention provides that, during a controlled adjustment of the water flow speeds in the ingot mold cooling water channels (10.4) and during a monitoring of the pressure loss DELTA p of the cooling water, the cooling water direction of flow (12) should correspond to the direction of continuous casting while forming a Nusselt layer that, at the height of the meniscus (19.1), is thinner than the Nusselt layer at the ingot mold outlet (19.2).
Abstract:
The invention relates to a method, which is used in the area of secondary metallurgy (4) in its entirety with a final temperature-determining process step (4.1) such as a ladle furnace, for controlling the temperature of steel from the surface of the bath of a continuous casting ingot mold (1) up to the furnace tap (5) of a steel producing process. According to the invention, the temperature of the steel in the surface of the bath is controlled based on the equation TML = TLI + X DEG C (X = 5 - 15 DEG C) and while respecting the same such that a jump in temperature (9) between the surface of the bath in the ingot mold (1) and a distributor (3) is detected according to the pouring rate (6) for a predetermined billet size. In addition, the ladle history (7) with regard to the time intervals, such as ladle full , ladle empty and ladle state, such as ladle bricking up and ladle age is detected as well as a jump in the temperature of steel between the distributor (3) and the last ladle furnace temperature (LF-ex).
Abstract:
The invention relates to a device for cooling the copper plates (1.1) of a continuous casting ingot mould (1) for liquid metals, especially liquid steel, comprising an ingot mould coolant (2) which is guided in cooling channels. During the initial temperature rise to achieve a set casting speed or when said casting speed is exceeded for a deviating copper plate skin temperature (8), the copper plate skin temperature (8) is influenced, even when the casting speed is higher, in such a way that surface errors in the casting shell and/or cracks in the surface of the copper plates are prevented from occurring or occur in a significantly reduced manner by adjusting the copper plate skin temperature (8) at alternating casting speeds (6) of between 1 m/min and a maximum 12 m/min by means of quantitative correction of the amount of ingot mould coolant (4) and/or ingot mould coolant inflow temperature (5) according to the casting speed (6) and according to the thickness of the copper plates (9), to a desired constant value.