Patent ID: 7021364

Claim:
An apparatus for preventing contamination of roll surface and strip edge bulging in a twin roll strip caster which includes a meniscus shield for interrupting inflow of external air while feeding non-oxidizing gas to prevent oxidation of molten steel in a molten steel pool defined by casting rolls, edge dams and a plurality of weirs mounted under the meniscus shield for preventing mold level fluctuation, the apparatus comprising: first chambers arranged at both sides of the meniscus shield in a longitudinal direction parallel to the casting roll and having inlet and exhaust ports for respectively feeding and exhausting a non-oxidizing gas to and from the first chambers, said first chambers including means for separating the inlet ports and exhaust ports to provide non-communication therebetween; second chambers each assembled to an underside in each of the first chambers in a communicating fashion for receiving non-oxidizing gas from the first chambers, and including a plurality of injection holes formed in an inclined face of each of said second chambers, said inclined faces having a shape corresponding to an outer peripheral face in each of the casting rolls in a longitudinal direction of the each casting roll for injecting the non-oxidizing gas to outer peripheral faces of the casting rolls and to portions of the molten steel pool; and exhaust passages formed between the meniscus shield and the second chambers communicating with the gas exhaust ports of the first chambers for allowing contaminated gas containing evaporated metal components from the molten steel pool and non-oxidizing gas injected from the second chambers to be outwardly exhausted.