| 摘要 |
PURPOSE:To enable joining of shaped refractories while hot and to exchange immersed nozzles while hot in the continuous casting of steel by using a molding body for masonry joint consisting of a refractory material and a binder and which maintains its shape at ordinary temp. and is plasticized at high temp. CONSTITUTION:A material consisting of 40-90wt.% of the refractory material (having the same composition as the nozzle refractory and tuyere refractory to be joined) and 10-60wt.% of a binder (e.g. thermoplastic resin and/or pitch) is mixed with 0.1-10wt.% by outer percentage of carbon fiber increased to prepare a molding body for the masonry joint. The molding body is heated to about 150 deg.C and made flowable, and the flowable body is press-formed into the shape equivalent to the joint between the tuyere brick 2 of a tundish 1 and an immersed nozzle 3 and having a flange 4 at the upper part, cooled and dried to obtain a cap-shaped molding body 5 for the masonry joint. The molding body is put on the nozzle 3 preheated to about 1000 deg.C, and is plasticized by the heat retained by the nozzle 3, softened and inserted, while still hot, into the tuyere brick 2 of the tundish 1, and both members are joined. |
