Direct pouring method using self-fluxing heat-resistant sheets

A method of directly pouring molten metal into a mold to make a metal ingot comprising;

• fixing on the top portion of the mold a hollow long body of self-fluxing heat-resistant sheet consisting of 50-90% by weight of at least one of an inorganic fiber, 1-10% by weight of a binder and 10-50% by weight of a silicate filler suspending into the said mold to reach the mold bottom;
• placing a casting powder on the mold bottom outside the said hollow long body;
• pouring the molten metal from the mold top through the said hollow long body and controlling the softening and fusion temperatures and rates of the said hollow long body so as to be fused and consumed under such conditions that the bottom end of the said hollow long body is constantly submerged into a given depth below the molten metal surface, with rise of the said molten metal surface in the said mold, wherein said inorganic fibers are selected from the three groups consisting of ceramic fiber, silicate fiber, boron fiber and carbon fiber with fusion temperatures greater than 1,300.degree. C;
• of rock wool and slag wool with fusion temperatures of 1,100.degree. - 1,300.degree. C;
• and of glass fiber and asbestos fiber with fusion temperatures of 800.degree.-1,100.degree. C;
• and blended so as to provide the blend with fusion temperatures of greater than 800.degree. C and said self-fluxing heat-resistant sheet has a thickness of 0.2-5mm.