In continuous casting the formation of blowholes presents a serious problem. Blowholes find their origin in the supply system from tundish to mould where argon is injected for the purpose of shrouding and as a means to prevent clogging. It is proposed to overcome the problem of blowholes by reducing the amount of argon injected into the feeding system. This implies that a new supply system should be developed to overcome clogging problems by combining the following items:
- a new collector nozzle;
- a new type SEN (submerged entry nozzle);
- a new flow regulating system;
- a new gas injection system.