COLUMBIUM ' 'H' ' SECTION PROGRAM. PHASE I - EXTRUSION. PHASE II - DRAWING.
Interim rept. no. 2, 1 Oct 63-1 Jan 64,
DU PONT DE NEMOURS (E I) AND CO BALTIMORE MD DU PONT METALS CENTER
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The development of the extrusion process for D-43 Nb 10W-1Zr-0.1C and Cb-752 Nb-10W-2.5Zr H sections continued. Efforts were concentrated on reduction of contamination and improvement of surface finish and dimensional control of extruded sections. Group II H extrusions 0.125 to 0.060 in. section thickness showed reduced contamination and improved straightness, but surfaces and uniformity of section thickness were unsatisfactory. Group I extrusions were drawn from section thickness of 0.188 in. at room temperature with reductions of 5 to 18 per pass. Total reductions up to 28 were made on short lengths without intermediate annealing. Author