METHOD FOR DOUBLE ALLOYING AND NANOPHASE MODIFICATION OF STEEL BY ATOMIC NITROGEN

摘要

The implementation (technique) of intense double alloying and modification involves introducing during the process of steel modification outside a furnace the nitrogen containing compound carbamide (NH)CO into a ladle containing a melt which compound dissociates in an explosive manner at a temperature of the steel liquid phase of approximately 1650°C thus releasing atomic nitrogen. A conversion (transformation) of the explosive carbamide dissociation process into an intense process of self propagating synthesis of nitride nanophases is carried out by using a carbamide addition regimen to the steel melt differentiated by the amount and time wherein the basic parameters dependent on the type of steel are an amount of carbamide consumption per tonne of steel in the range of 0.4 1.8 kg/ton and a rate of addition thereof to the melt in the range of 5.0 8.0 kg per minute.