| 摘要 |
PURPOSE:To lower the machine hight and decrease casting defects as well by making the leveling internal strain rate of a slab at each leveling point of the multipoint leveling curving type continuous casting machine less than the specific value, and generating agitating thrust by a static magnetic field supply in the slab direction before or behind or before and behind the leveling region. CONSTITUTION:Casting is performed by making the leveling internal strain rate epsilonN expressed by the formula within <=0.35% range, and generating agitating thrust by a static magnetic field supply system in the slab direction before or behind or before and behind the leveling region. The casting machine have 5 points of leveling, P1-P5. The curving radii R1-R5 at the respective leveling points have different values; they become gradually larger, like R1 5,800mm. and R5 7,100mm.. Here, a slab sizing 410X1,700mm. is cast at 0.5m/min speed but electromagnetic agitating devices 2, 4 of an electrostatic magnetic field supply system are provided before the leveling point P1 of the leveling region and behind P5, to generate agitating thrust in the slab direction before or behind or before and behind the leveling region. The frozen shell thickness at he leveling point P1 is 110mm. and the rate of freezing is about 54%. Hence, the leveling strain rate at the leveling point P1 is 0.28%, below the specific 0.35%, and the respective strain rates of P2- P5 become nearly the same values. |
