Abstract: A molten alloy solidification analyzing method of the invention is characterized in that the amount of change in fraction solid is calculated based on the solidification rate of molten alloy and the solidification rate parameter that is a parameter for evaluating the influence of the solidification rate on solidification of the molten alloy, according to the fraction solid. By conducting such a simulation that takes into consideration the supercooling, a highly accurate solidification analysis is relatively easily performed for various molten alloys.

Abstract: A method is provided for influencing the properties of cast iron by adding magnesium to the cast iron melt and measuring the oxygen content of the cast iron melt. Magnesium is added to the cast iron melt until the oxygen content of the cast iron melt is approximately 0.005 to 0.2 ppm at a temperature of approximately 1,420° C. A sensor for measuring the oxygen content in cast iron melts contains an electrochemical measuring cell containing a solid electrolyte tube.

Abstract: Ferritic spheroidal graphite cast iron includes: 3.1 to 3.5 percent by mass of carbon; 4.1 to 4.5 percent by mass of silicon; 0.8 percent by mass or below of manganese; 0.1 to 0.6 percent by mass of molybdenum; 0.1 to 1.0 percent by mass of chromium; 0.03 to 0.1 percent by mass of phosphorus; 0.03 percent by mass or below of sulfur; 0.02 to 0.15 percent by mass of magnesium; and iron.

Abstract: Disclosed is a stainless steel containing, by mass, 0.05% or less carbon, 1.5 to smaller than 3.5% Si, 3.0% or less Mn, 6.0 to 12.0% Cr, 4.0 to 10.0% Ni, 10.0% or less Co, 6.0% or less Cu, 0.5 to 3.0% Ti, 0 to 2.0% Al, not more than 1.0% Mo, not more than 0.01% nitrogen, and the balance of Fe and unavoidable impurities. Preferably, it has a hardness of not lower than 59 HRC and may contain not more than 1.0% Nb and/or not more than 1.0% Ta. Alternatively, the stainless steel may further contain not more than 0.1% of Zr. The process for producing the steel includes producing a steel having a composition as described above by a consumable electrode remelting process, and then subjecting the steel to a solution treatment at a temperature of 1000 to 1150° C. and an aging treatment at a temperature of 400 to 550° C., thereby aging the stainless steel to a hardness of not lower than 59 HRC.

Abstract: This invention covers the method and equipment for the continuous or discontinuous addition of reaction/inoculation materials necessary for desulphurization or the production of ductile iron obtainable during the passage of the base iron through a basin containing the chamber for melting, vaporizing and distributing the reaction-inoculation materials into the melt (e.g. magnesium vapor-Ferrum Silicon). The treatment can be conducted continuously for unlimited or freely definable quantities of iron.

Abstract: A method of manufacturing compacted graphite cast iron, in which graphite modifying alloying agents, in the form of a so-called treatment alloy, are added to low-sulphurous molten cast iron. The treatment alloy is added to the molten iron by being sprayed into a jet of the molten iron as the latter is being discharged from a casting furnace. A dosed amount of treated iron is maintained for a predetermined period of time inside a casting box for homogenization and slag flotation, whereupon it is poured into a casting mold.

Abstract: A method for producing ductile iron in a single reactor without the utilization of further processor like converters, tundishes, plunging etc. is disclosed. The method is applied in a modified induction furnace with a removable bottom injection device stainless steel tuyere type wherein it is possible to inject different gases like nitrogen, argon, chlorine, natural gas and solids like Magnesium, alloying, innoculants, desulfurization agents etc. through pneumatic transportation.

Abstract: Device and method for treatment of metallic baths by means of at least one treating material having high potential for development of gases or vapours when heated by the metallic bath, comprising a ladle having a pouring spout and a closing lid. In the ladle's bottom is formed a closed chamber, to be enclosed by the metallic bath when poured into the ladle, for receiving the treatment material and holding the vapours or gases which develope. The chamber is provided with at least one release conduit rising to end within the ladle, the release conduit being closed by a plug to provide a controlled opening.

Abstract: A magnesium treatment process is proposed for the production of a treated iron melt containing less than 100 grams per ton non-metallic inclusions. The treatment reaction is so arranged that the magnesium is introduced into the melt from a chamber at a depth of at least 200 mm below the surface of the melt. Thus, the quantity of vaporized magnesium produces a mixing energy of at least 1,000 W/m.sup.3, which ensures the necessary elimination of non-metallic inclusions. The surface of the molten mass is covered by a non-oxidizing, preferably a reducing atmosphere.

Abstract: An apparatus and method for injecting magnesium into molten iron. The magnesium is melted and vaporized in an enclosed container located above and heated by the molten iron. The magnesium vapor is then pumped into the molten iron by its own vapor pressure, through a pipe inserted into the molten iron, from which it bubbles through and reacts with the iron. A load cell from which the magnesium container is hung is used to measure the weight loss of magnesium and thereby control the amount of magnesium added to the iron.