B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
205/37, 113/56
B21D 15/02 (2006.01) B21B 25/00 (2006.01) B21C 23/10 (2006.01) B21C 37/20 (2006.01) B21B 3/00 (2006.01) B21B 3/02 (2006.01) B21B 15/00 (2006.01) B21B 21/00 (2006.01) B21B 45/02 (2006.01)
Patent
CA 2032881
ABSTRACT DURABLE METHOD FOR PRODUCING FINNED TUBING The method of the invention produces a method for fabricating a metal tube that contains at least 30 wt% nickel and 10 wt% chromium. The invention utilized an elongated mandrel having an oversized diameter and oversized land portions. The oversized land portions project radially outward from the mandrel and extend longitudinally along the mandrel. The valley portions are located between the land portions and extend longitudinally along the mandrel. Oversized diameter internally finned tubing is formed with the mandrel. The oversized diameter internally finned tubing is sent to a finished diameter. The sinking reduces radial spacing between the fins and elongates the oversized diameter internally finned tubing without substantially reducing the height of the fins.
England Jimmy Carroll
Hensley John Robert
Moehling Frederick Ernest
Roberts Everett Maxwell
Ruble Hugh Hiram Jr.
Inco Alloys International Inc.
Smart & Biggar
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