THE CONVERSION OF EXTRUDED BERYLLIUM TUBING TO A CLOSE TOLERANCE BORE TUBE. Laboratory Report 1812. Includes Appendices: B. THE TROUBLE WITH BERYLLIUM. C. NITRIC FUME SCRUBBING

Technical Report · Sun Feb 15 04:00:00 EST 1959

OSTI ID:4097785

Hood, A C; Bpunds, A M; Sawkill, J; Jones, O J; Sullivan, J

Beryllium tubing is hot extruded from pre-sintered and machined billets to sizes from 0.025-in. OD by 0.030-in. wall to 2.0-in. OD by 0.250-in. wall. The extruded tubing is warm bore sized by pulling a mandrel through the tube, to attain close tolerances. A finished tube measures 0.375 0.008-in. OD by 0.040 0.001-in. ID. The bore sizing operation reduces the extruded tube yield by 25%. The properties of the tubing were investigated by bending and internal hydrostatic proof testing at 1000 psi. Burst tests indicated that the tube will withstand 10,000 psi before failure where the surface was suitably polished chemically. Tubing texture studies revealed a preferred orientation with basal planes parallel to the longitudinal direction and situated radially out from the center of the tube; resulting in transverse properties lower than longitudinal properties. Metallographic studies revealed a precipitate in the supposedly pure metal which can be made to shift from the grain boundaries to the matrix by heat treatment. (B.O.G.)

• Research Organization: Superior Tube Co., Norristown, Penna.; Tube Investments, Ltd. Technological Centre, Walsall, Staffs, England
• NSA Number: NSA-15-009386
• OSTI ID: 4097785
• Report Number(s): TID-11535
• Country of Publication: United States
• Language: English

Related Subjects

BERYLLIUM
CHEMICALS
CLEANING
EXTRUSION
FAILURES
HEAT TREATMENTS
HOT WORKING
LEAKS
MACHINING
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
PRESSURE
STANDARDS
SURFACES
TENSILE PROPERTIES
TESTING
TUBES