Patent ID: 8870041
Filing Date: 2014-10-28
Classification: B22D

Abstract:
1. An immersion nozzle for continuous casting, comprising: a tubular body elongated along a central axis, the tubular body having a bottom in the direction of elongation of the tubular body, the bottom of the elongated tubular body having a lower end face extending generally transverse to the direction of elongation of the tubular body, the tubular body having an inlet for entry of molten steel disposed at an upper end of the tubular body in the direction of elongation of the tubular body, a passage extending inside the tubular body downward from the inlet toward the bottom, wherein at least a lower section of the tubular body and the passage have a rectangular flat shape in a cross section transverse to the direction of elongation of the tubular body, the rectangular flat shape of the passage being defined by relatively narrow opposite inner sidewalls of the rectangular flat shape of the tubular body and relatively wide opposite inner sidewalls of the rectangular flat shape of the tubular body; a pair of opposing first outlets disposed in the narrow sidewalls forming the passage so as to communicate with the passage, a pair of second outlets disposed in the lower end face of the tubular body so as to communicate with the passage; a pair of partitioning sections respectively formed in the relatively narrow sidewalls at the pair of the first outlets, each of the partitioning sections partitioning a respective first outlet into an upper outlet and a lower outlet, which upper outlet and lower outlet are separated from one another by the respective partitioning section; and ridges formed between the pair of partitioning sections, each of the ridges projecting into the passage from one of the relatively wide opposite inner sidewalls forming the rectangular shape of the passage, and horizontally intersecting the respective relatively wide inner sidewall; wherein the pair of second outlets are disposed symmetrically to the central axis of the tubular body such that virtual faces extended from tilted faces of the second outlets intersect with each other in the passage.