摘要:
Method and investment shell mold for casting comprising introducing molten metallic material into an investment shell mold to fill a mold cavity and provide an upper surface of the molten metallic material above the mold cavity. An initially closed, destructible region of the mold then is broken to provide an entry opening through which exothermic material is placed on the upper surface of the molten metallic material to provide a source of molten metallic material to accommodate shrinkage of a casting as it solidifies in the mold cavity.
摘要:
A casting powder for use in ingot steel production through bottom pour process is provided. The powder combines the crucial properties of existing bottom pour fluxes and hot topping compounds into a single, easily dispensed mixture. The present invention provides a significant simplifying and savings over present methods while producing steel with fewer impurities.
摘要:
In a method of and apparatus for producing ingots of unalloyed and alloyed steels having an improved primary crystallization, reduced ingot segregation and a reduced content of non-metallic inclusions, molten steel is poured into a mould, a slag mixture is supplied onto said steel, energy is supplied to the slag mixture while the steel is solidifying in the mould, and the upper rim zone of the molten steel bordering on the slag mixture is cooled.
摘要:
A process for casting steel ingots, wherein the steel from a ladle is cast under vacuum through the lid of a container which can be evacuated, into a mould, and wherein covering powder or anti-piping compound, respectively, is evenly applied upon the surface of the molten steel in the mould while the vacuum is maintained.
摘要:
Smokeless exothermic hot topping compositions are provided for application to the metal hot top of a cast ingot or a casting riser to improve the yield of usable metal or inhibit piping. Exothermic compositions containing aluminum, iron oxide and inert filler materials are disclosed which produce no visible smoke when used as hot topping materials.
摘要:
IN THE PRODUCTION OF STEEL INGOTS, THE STEEL IS POURED INTO THE INGOT MOULD THROUGH A FLUX LAYER, THE FLUX INCLUDING AT LEAST ONE FLUORIDE, AND AT LEAST ONE ALKALI METAL CARBONATE. PREFERRED FLUX COMPOSITIONS INCLUDE CALCIUM FLUORIDE, SODIUM CARBONATE, ANTHRACENE, CALCIUM OXIDE AND FERROSILICON.