Horizontal continuous casting manner and nozzle null for horizontal continuous casting device

摘要

PURPOSE:To prevent breakout, fine crack and pit and to improve the casting quality and the yield by selecting the suitable size of a nozzle connecting a tundish and a mold in a horizontal continuous casting apparatus. CONSTITUTION:In the horizontal continuous casting for intermittently drawing a cast billet by connecting the tundish 11 and the mold 21 through the nozzle and fitting a brake ring 18 at the inlet side of the mold 21, the nozzle size is selected so that sum SIGMA(L1/A1) of ratio of nozzle length L1 to cross sectional areas A1 of the nozzle and drawing acceleration velocity aO in the cast billet satisfies the inequality. In the inequality, DELTAPa (acceleration): permissible pressure variation Pa in the mold at the time of accelerating, DELTAPa (deceleration): permissible pressure variation Pa in the mold at the time of deceleration, rho: density (kg/cm3) of molten metal, AO: cross sectional area (M2) of the mold, aO: drawing acceleration velocity (m/s2) of the cast billet.