| 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. This stage is followed by a roughing stand and preferably two finishing stands; laminar flow cooling and a reheat furnace may also be used. Both a primary (e.g. 30 tons) and secondary tundish (e.g. 5 tons) are provided above the caster. An inert or 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 from the exit port of the secondary tundish, and a transversely extending splash guard extends generally horizontally outwardly from the guiding shroud at the underside of the secondary tundish. A series of offset bending and unbending rolls changes the orientation of the cast steel strand from vertical to horizontal. The bending and unbending rolls spaced on the inside of the arc of travel of the cast strand are spaced more closely together than the rolls on the outside of the arc.</p> |
