METHOD FOR OBTAINING HIGH-STRENGTH CAST-IRON WITH VERMICULAR GRAPHITE BY INTRA-MOULD MODIFICATION US

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FIELD : metallurgy. SUBSTANCE : method involves loading to a reaction chamber of a pouring gate system of modifying agent charge in the form of Fe-Si-REM alloy combination providing initial concentration of rare-earth metals in molten cast-iron of 0.075%; then, after the casting mould is assembled, a lump of FS75 with the weight of 0.24-0.46% of metal consumption of the mould is laid in its pouring basin for graphitising pre-modification, and it is filled with molten cast-iron from the furnace. EFFECT : stable obtainment in the cast-iron structure of fully vermicular shape of graphite throughout the surface area of all the casting sections without formation of any inclusions of free cementite. 6 dwg