METHOD OF PRODUCING SEAMLESS TUBES

摘要

A process for producing seamless tubes of austenitic steels is disclosed. A metallic melt is continuously poured into a cooled mold having a round molding cavity. The as yet fully unsolidified extracted billet is electromagnetically agitated in a direction about its longitudinal axis. Once hardened, the billet is cross cut, and the castings are subjected to annealing at a temperature between 1100 DEG C. and 1250 DEG C. (preferably between 1150 DEG C. and 1200 DEG C.) for between 30 minutes and 4 hours (preferably between 1 hour and 2 hours). The castings are allowed to cool, are machined into extrusion blooms and the seamless tubes produced by extrusion of the blooms.