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51315-5502-UNS N09955: A New Ni-Base Alloy for H?S and Hydrogen Charging Environments

Picture for UNS N09955: A New Ni-Base Alloy for H?S and Hydrogen Charging Environments
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Product Number: 51315-5502-SG
ISBN: 5502 2015 CP
Author: Carlo Malara
Publication Date: 2015
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After the revision process of API 6A718 and API 5CRA specifications a new precipitation hardenable Ni-base alloy has been developed for applications in H2S and hydrogen charging environments. The new alloy has been named AF955. It is patent pending has been submitted for UNS number assignment and is being submitted for inclusion in NACE MR0175/ISO 15156. The AF955 alloy is produced at strength levels of 827 MPa (120 ksi) of minimum yield strength (MYS) and 965 MPa (140 ksi) MYS with very good toughness and with microstructure characterized by uniform and equiaxed grain size distribution minimised secondary phase precipitation and free of continuous grain boundary precipitates. The AF955 alloy shows resistance to intergranular corrosion pitting and stress corrosion cracking very similar to that of UNS N07716 and better than UNS N07718. Alloy AF955 exhibits a low susceptibility to hydrogen embrittlement similar to that of UNS N07718 and much lower than UNS N07716.Details of manufacturing process and characterization of AF955 alloy in terms of chemical analysis mechanical properties microstructure corrosion resistance and hydrogen embrittlement susceptibility are presented and discussed in this paper.Key words: AF955 hydrogen embrittlement corrosion resistance Ni-alloys
After the revision process of API 6A718 and API 5CRA specifications a new precipitation hardenable Ni-base alloy has been developed for applications in H2S and hydrogen charging environments. The new alloy has been named AF955. It is patent pending has been submitted for UNS number assignment and is being submitted for inclusion in NACE MR0175/ISO 15156. The AF955 alloy is produced at strength levels of 827 MPa (120 ksi) of minimum yield strength (MYS) and 965 MPa (140 ksi) MYS with very good toughness and with microstructure characterized by uniform and equiaxed grain size distribution minimised secondary phase precipitation and free of continuous grain boundary precipitates. The AF955 alloy shows resistance to intergranular corrosion pitting and stress corrosion cracking very similar to that of UNS N07716 and better than UNS N07718. Alloy AF955 exhibits a low susceptibility to hydrogen embrittlement similar to that of UNS N07718 and much lower than UNS N07716.Details of manufacturing process and characterization of AF955 alloy in terms of chemical analysis mechanical properties microstructure corrosion resistance and hydrogen embrittlement susceptibility are presented and discussed in this paper.Key words: AF955 hydrogen embrittlement corrosion resistance Ni-alloys
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