Method of making seamless tubing

Details Method of making seamless tubing Method of making seamless tubing

1982-10-04

1984-02-21

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 12E, 148136, C21D 800

Patent

active

044328117

ABSTRACT:
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.degree. C. and 1250.degree. C. (preferably between 1150.degree. C. and 1200.degree. 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.

REFERENCES:
patent: 3523833 (1970-08-01), Kroneis et al.

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