Hydrostatic Extrusion of 60mm Mortar Tubes
WATERVLIET ARSENAL NY
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Mortar tubes were successfully hydrostatically extruded from Inconel 718 proving the feasibility of the process. The yield strength of the 718 material was increased from 160 ksi to 240 ksi by the cold work induced by the extrusion process. A cost savings of about 400 per tube can be realized by hydrostatically extruding the mortar tubes close to finished size and thereby reducing the machining costs, rather than machining the tubes from forgings. Thus, it may be possible to economically use Inconel 718 and derive the benefits of the increased high temperature strength inherent in the material. As an adjunct to this project, an estimate was made of the potential savings for hydrostatically extruded gun steel mortar tubes compared to forged tubes. It is estimated that a savings of approximately 63 per tube would be possible.
- Fabrication Metallurgy