Abstract: A process for preparing a mother alloy for making a Fe-B-Si base amorphous metal is described, comprising the steps of:providing a molten metal containing an iron source and ferrosilicon;adding to the molten metal a mineral ore containing a boron oxide;reducing a predetermined amount of the boron oxide in the molten metal by the reducing action of carbon or silicon that is initially present in the metal or externally added together with the mineral ore, thereby dissolving said boron oxide as elemental boron in the molten metal;removing the carbon or aluminum by supplying an oxidant; andadjusting the contents of boron and silicon in the molten metal to be within a desired composition range.

Abstract: A process and apparatus for producing a metallic laminar composite material utilizes a pressure tank, a ladle, and a dip tube for transferring molten metal into a mold which has a metallic plate suspended within it. The molten metal is supplied by the ladle and the dip tube in such a way that slag and scum existing on the surface of the molten metal are not introduced into the mold. Prior to introducing the molten metal into the mold, the mold is purged with an inert gas to prevent oxidation of the surface of the metallic plate. The mold is made of freely movable carbon segments which permit easy assembly and disassembly of the mold for varying the size of the molding chamber.

Abstract: In a molten steel droplet scatter regulation cylinder for use in a vacuum steel casting system, for the object of prevention of growth of molten steel droplets into a solid steel block at the lower end portion of the cylinder to subsequently drop into the molten steel, deteriorating its internal properties, the cylinder has at least its lower end portion made of a material which has a small wetting property against the molten steel, e.g. carbides such as graphite, silicon carbide, etc. or refractory materials containing carbon, carbides, etc.

Abstract: This invention relates to a process for preventing the rephosphorization phenomenon in which, during the production of killed steel in a basic electric furnace, a part of the phosphorus oxide formed and removed in the oxidizing period is reduced in the subsequent deoxidizing period to increase the phosphorus content of the melt again. This process comprises subjecting the melt to oxidizing refinement in the electric furnace, pouring the resulting undeoxidized melt and slag into a ladle, removing the slag of the oxidizing period completely from the melt either by skimming it off or by pouring only the melt into another ladle, and then deoxidizing the melt in the ladle. According to this process, the rephosphorization phenomenon attributable to the residual slag of the oxidizing period adhering to the wall surfaces of the furnace and/or the phosphorus pentoxide (P.sub.2 O.sub.