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Spray Forming Alloy 625 Marine Piping

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Near-net-shape manufacturing methods for large-diameter Alloy 625 piping have been evaluated to determine cost advantages and product quality over conventional manufacturing and powder metallurgy technologies. One particular method, Osprey spray forming, has proven itself to be a viable alternative. The sprayformed preforms exhibit uniform, equiaxed microstructures and mechanical properties approaching those of wrought via spray forming possesses mechanical properties surpassing those established by current specifications while the microstructures remain fine and quite uniform after cold rolling. In addition, a cost evaluation indicates sizable potential savings when Alloy 625 is produced by spray forming.

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    A.L. Moran and W.A. Palko, “Evaluation of Near Net Shape Alloy 625 Tubular Preforms for Seawater Piping,” Progress in Powder Metallurgy, 43 (1987), pp. 711–721.

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    A.L. Moran and W.A. Palko, “Alloy 625 Piping Produced Via Near-Net-Shape Processing,” (Paper presented at 1988 International Powder Metallurgy Conference, Orlando, Florida, 5–10 June 1988).

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    Metals Handbook, T. Layman, ed., vol. 5, (Metals Park, Ohio, American Society for Metals, 1980), pp. 140–141.

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    L.F. Glasier and J.M. Roberts, “The Manufacture of Alloy 625 Seamless Pipe by the Roll Extrusion Process,” (paper presented at American Society for Metals Proceedings, Ninth Conference on Advances in Production of Tubes, Bars and Shapes, Cincinnati, Ohio, 22–24 April, 1985).

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    Kaiser-Rollmet Technical Bulletin, “Net Material Costs of Ingot vs. Powder Metallurgy Starting Material,” February 8, 1984.

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Author’s Note: Opinions and assertions contained herein are those of the authors and are not to be construed as official or reflecting the view of the Department of the Navy or the Naval Service at large.

Angela L. Moran received her Ph.D. in materials science and engineering from Johns Hopkins University. She is currently a materials engineer in the Metals and Welding Division of the David Taylor Research Center, Department of the Navy, in Annapolis, Maryland. Dr. Moran is also a member of TMS.

William A. Palko received his B.S. in metallurgical engineering from Drexel University. He is currently a metallurgist in the Metals and Welding Division of the David Taylor Research Center, Department of the Navy, in Annapolis, Maryland.

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Moran, A.L., Palko, W.A. Spray Forming Alloy 625 Marine Piping. JOM 40, 12–15 (1988). https://doi.org/10.1007/BF03258787

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  • Powder Metallurgy
  • Tensile Test Result
  • Piping Material
  • Equiaxed Microstructure
  • Ingot Metallurgy