SETT VID KONTINUERLIG GJUTNING AV OLIKA STALKVALITETER EFTER VARANDRA SAMT ANORDNINGAR HERTILL

摘要

Sequential continuous-casting of different grades of molten steel comprises stopping the pouring of a first grade of molten steel 14 into a mold 12; immersing a cooling material consisting of steel stock or a steel structure 18 slightly smaller than the inner cross-sectional area of the mold by way of guiding jigs fastened to said cooling material; forming a solidified phase 22 around said cooling material and merging said solidified phase into a solidified shell 16 developed from the wall of the mold to form a solidified layer shutting off the lower portion of the first grade of molten steel. Pouring of the second grade steel 20 is started before the surface of the first grade steel is completely solidified, and at the same time, drawing of the cast slab is started again and the change-over to normal continuous casting of the second grade steel is effected.