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High Performance New Ni-Base Alloy AF955 (AF955) for Oil and Gas Industry

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Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

A precipitation hardened Ni-base alloy has been developed to fulfil the recent stringent requirements of the oil and gas industry. The new alloy is commercially designated as AF955 and the Unified Numbering System (UNS) assignment of N09955. The new alloy is patented and accepted for inclusion in NACE MR0175/ISO 15156. It is produced at strength levels of 827 MPa (120 ksi) 0.2% offset minimum yield strength (MYS) and 965 MPa (140 ksi) MYS with very good ductility and toughness, and with a microstructure characterized by fine γ′ and γ″ strengthening precipitates, uniform and equiaxed grain size distribution, minimized secondary phase precipitation and free of continuous grain boundary precipitates. It exhibits good corrosion resistance and low susceptibility to hydrogen embrittlement . These properties make alloy AF955 a very promising material for widespread applications from oil and gas industry to power generation, chemical applications and many others. Details of the manufacturing process and properties of AF955 are presented and discussed in this paper.

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References

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Author information

Authors and Affiliations

  1. Foroni SpA, Via A. Colombo, 285, 21055, Gorla Minore (VA), Italy

    Luca Foroni & Carlo Malara

  2. Lherbier Consulting, Pittsburgh, PA, 15241, USA

    Louis Lherbier

Authors
  1. Luca Foroni
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  2. Louis Lherbier
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  3. Carlo Malara
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Corresponding author

Correspondence to Louis Lherbier .

Editor information

Editors and Affiliations

  1. General Electric, Cincinnati, Ohio, USA

    Eric Ott

  2. West Virginia University, Morgantown, West Virginia, USA

    Xingbo Liu

  3. University West, Trollhättan, Sweden

    Joel Andersson

  4. China Iron and Steel Research Institute, Beijing, China

    Zhongnan Bi

  5. ‎ATI Specialty Materials, Monroe, North Carolina, USA

    Kevin Bockenstedt

  6. Wyman Gordon Forgings Inc., Houston, Texas, USA

    Ian Dempster

  7. General Electric, Cincinnati, Ohio, USA

    Jon Groh

  8. Carpenter Technology, Philadelphia, Pennsylvania, USA

    Karl Heck

  9. United States Department of Energy, Albany, New York, USA

    Paul Jablonski

  10. Pratt & Whitney, East Hartford, Connecticut, USA

    Max Kaplan

  11. Honda Motor Co. Ltd., Saitama, Japan

    Daisuke Nagahama

  12. QuesTek Innovations, Evanston, Illinois, USA

    Chantal Sudbrack

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© 2018 The Minerals, Metals & Materials Society

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Cite this paper

Foroni, L., Lherbier, L., Malara, C. (2018). High Performance New Ni-Base Alloy AF955 (AF955) for Oil and Gas Industry. In: Ott, E., et al. Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-89480-5_11

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