B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
80/12
B21B 17/00 (2006.01) B21B 19/00 (2006.01) B21B 21/00 (2006.01) B21B 23/00 (2006.01) B21B 25/00 (2006.01)
Patent
CA 1086104
ABSTRACT OF THE DISCLOSURE The disclosure relates to an advantageous process for the production of seamless tubular products with mill equipment requiring minimum capital expenditure. The starting material for the process typically is a short, square billet derived from a continuous casting process. The billet is first processed in a piercing press, in a manner to provide a generally circular outer contour and also to pierce the billet axially substantially through- out its length. After the piercing press, the billet is processed in a piercing-type alongator, which may be of either two-roll or three-roll configuration and serves to effect a substantial (e.g., about three or even four to one) elongation of the billet, and also a significant reduction of its wall thickness. The elongated billet is then processed in a multiple stand mandrel mill, which serves to further elongate the workpiece, by a factor of around three to one, and further reduce both its wall thickness and its outside diameter. At this stage, it may be desirable to further process the tubular shell in which case the tubular shell is re- heated and processed in a more or less conventional manner in a stretch reducing mill. In mills where the starting billets are available in cylindrical form, the piercing press may be eliminated, and the billet may be both pierced and elongated in the piercing- type elongator. Significant to the invention is the utilization of a piercing-type elongator to achieve a significant degree of elongation, in conjunction with a mandrel mill, which may be, if desired, utilized at significantly less than its maximum theoreti- cal elongation capability.
300157
Osler Hoskin & Harcourt Llp
White Consolidated Industries Inc.
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