Ultra high strength tubes of UNS N07716 alloy with an actual yield strength higher than 180 ksi (1240 MPa) were produced by a special manufacturing process. These tubes are intended for sour high pressure high temperature (HPHT) environments at temperatures in the range from 200 to 260 °C (400-500 °F), pressures in the range from 200 to 280 MPa (30-40 ksi), for environments containing CO2, H2S, Cl- with or without elemental sulphur. They were characterized in terms of mechanical properties, microstructure, corrosion resistance in sour environments and susceptibility to hydrogen embrittlement. Results of this test programme are herein presented and discussed.

Subject
Hardening, Environmental cracking, Hydrogen embrittlement, Materials, Manufacturing, Microstructure, Tubes, Sour environments, C ring stress corrosion testing, Elongation, Elemental sulfur, Hardness, Yield strength
Keywords:
UNS N07716, ultra high strength tubes, HPHT
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2014
Association for Materials Protection and Performance (AMPP)
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