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US 5,634,512 AGranted
Method and apparatus for casting and thermal surface treatment
AssigneeDanieli & C. Officine Meccaniche SpA
InventorsBruno Bombardelli, Cristiano Tercelli
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AssigneeDanieli & C. Officine Meccaniche SpA
InventorsBruno Bombardelli, Cristiano Tercelli
Estimating the term…
Method for thermal surface treatment in line in a continuous casting machine associated with furnaces to heat hot-charge blooms, the method being applied to fine-grain structural steels and being suitable to obviate the precipitation of compounds of aluminum, vanadium, niobium and the like and to eliminate or at least to reduce greatly the surface faults due to tension, the method being carried out in a continuous casting line comprising at least a mould (13), a secondary cooling chamber (14), an extraction and straightening assembly (15) and a shearing assembly (17), the method being applied in cooperation with the extraction and straightening assembly (15) and including an intense, concentrated cooling of the surface of a bloom (19) passing through by applying a cooling fluid under pressure, which is water-based and is sprayed by a plurality of sprayer nozzles (18), the cooling being adapted to the dimensions of the bloom (19) and being such as to produce a surface temperature between about 400.degree. C. and about 900.degree. C. after the natural tempering caused by the hot core of the bloom (19); and a device suitable to carry out the above method and including a plurality of sprayer nozzles (18) arranged about the circumference of the bloom (19) and facing the bloom (19), the sprayer nozzles (18) being fed with a water-based cooling fluid under pressure and which are associated at least with a device (23) which regulates the pressure.
Method for thermal surface treatment in line in a continuous casting machine associated with a heating furnace to heat hot-charge blooms of fine-grain structural steels and being suitable to obviate the precipitation of compounds of aluminum, vanadium, niobium and to eliminate or at least to reduce greatly the surface faults due to tension, the method comprising continuously casting a bloom in a mould and passing the bloom through a secondary cooling chamber, an extraction and straightening assembly and a shearing assembly, further comprising, before passing the bloom through the shearing assembly, passing the bloom through a plurality of sprayer nozzles thereby effecting an intense, concentrated cooling of the surface of the bloom by means of a water-based cooling fluid under pressure sprayed by the plurality of sprayer nozzles, the cooling being adapted to the dimensions of the bloom and being such as to produce a bloom having a hot core and a surface temperature between about 400.degree. C. and about 900.degree. C. after natural tempering caused by the hot core of the bloom.
A continuous casting line includes a spray box device to carry out a method of thermal surface treatment of blooms of fine-grain structural steels to obviate the precipitation of compounds of aluminum, vanadium, niobium and to eliminate or at least to reduce greatly the surface faults due to tension, the spray box device being provided in the continuous casting line comprising at least a mould, a secondary cooling chamber, an extraction and straightening assembly and a shearing assembly, the spray box device being provided upstream of the shearing assembly and comprising a plurality of sprayer nozzles arranged about the circumference of the bloom and facing the bloom, the sprayer nozzles being fed by means for delivering a water-based cooling fluid under pressure and associated at least with means for regulating the pressure to effect an intense, concentrated cooling of the surface of the bloom to produce a bloom having a hot core and a surface temperature between about 400.degree. C. and 900.degree. C. after natural tempering caused by the hot core of the bloom.
Dependencies are inferred from the claim text.