Development of High Strength Columbium and Tantalum Alloy Tubing
Abstract
The feasibility of drawing B-66 to tubing was demonstrated. A solid B-66 rod was gun-drilled and then reduced by drawing, 80%, to 0.5 inch 0.D. x 0.062 inch wall tubing at 600 deg F. An attempt to draw B-66 to tubing at room temperature was unsuccessful because of a lubrication failure. This resulted in excessive galling between the die and tube 0.D. from which a crack was initiated. Tube drawing is being done at the facilities of the Superior Tube Company. Extrusion of 69 pounds of B-66 and 142 pounds of T-111 tube blanks at a reduction ratio of 7:1 was accomplish at the facilities of Nuclear Metals, The extrusion constant for the B-66 was 80-81.7 ksi and 76-85.5 ksi for the T-111. The results of the tube blank extrusions verified the data from the extrudability evaluation that were described in the Second Quarterly Progress Report. The B-66 extrusions were conditioned and yielded 43.75 pounds of tube blanks, a 63% recovery of useable material based on the starting extrusion billet weight. The as-conditioned B-66 tube blanks were successfully warm tube reduced 55% from a 2 inch 0.D. x 0.25 inch wall to a 1.375 inch 0.D. x 0.156 inch wall.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 11, 1963
- Accession Number
- ADA397256