seen framstella forbettrade metallgjutstycken by pneumatic refining of smeltan fore casting

摘要

The method consists in transferring the molten metal charge from the furnace to a converter (1) equipped with submerged, dual-flow blast pipes (tuyeres) (6, 7). Mixtures of oxygen and argon are injected via these blast pipes (tuyeres) (6, 7) in order to eliminate certain undesirable bodies in the casting alloy, such as sulphur, lead, zinc, etc., and in order to control the final carbon content very precisely. The castings obtained are characterised by excellent surface and internal qualities and by an improved impact strength (ductility) compared with castings obtained by conventional methods. IMAGE