PROCESS FOR MAKING AS-CAST FERRITIC SPHEROIDAL GRAPHITIC DUCTILE IRON

摘要

Process for producing graphitic, spheroidal and ferritic iron using no pig iron and rather consisting in melting steel scrap with low silicon content and medium manganese content in an electric furnace with about 3% by weight of low sulfur graphite. When the melt reaches a temperature of 1400 ° C, it is cleaned. Then, add enough graphite to bring the carbon content down to 3%. Before or after this operation, products can be added back to the molten bath while the current supply to the oven is connected, in order to cause agitation of the bath. Said molten bath is heated to a temperature above 1470 ° C, and a carbon and silicon correction is carried out. Finally, the fusion bath is inoculated and the parts are cast.