| 摘要 |
<p>A twin-roll caster casts steel strand of thickness preferably 5 to 35 mm. Immediately downstream of the twin rolls, a water-cooled copper stationary mold further cools the strand. The upper surfaces of the stationary mold are preferably cylindrically concave shaped to hug the twin rolls. Immediately downstream of the stationary mold, the casting passes through strand containment apparatus comprising a series of segmented rolls with secondary spray cooling. Both a primary (e.g. 30 tons) and secondary tundish (e.g. 5 tons) are provided above the caster. Molten steel passes from the supply ladle into the primary tundish and thence into the secondary tundish. An inert of reducing gaseous atmosphere is provided above the surface of the molten steel pool formed above the kissing point of the twin rolls. An elongated rectangular guiding shroud extends downwardly into the molten steel pool from the exit port of the secondary tundish. A transversely extending splash guard extends generally horizontally outwardly from the guiding shroud at the underside of the secondary tundish. The edges of the splash guard are closely spaced from the twin casting roll surfaces and help to confine the gaseous atmosphere above the molten steel pool.</p> |
