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Precipitation hardened (PH) Ni-based alloys have been utilized in oil and gas industry for decades. Among them, UNS1 N07718 because of its performance in sour wellbore fluids and in hydrogen charging environments has received the most attention for multiple upstream applications such as tubing hangers, production stab, multi-phase flow meter bodies, valve stems, etc. It has been reported that the alloy performance is generally acceptable for many applications up to 175 °C (350 °F) – 204 °C (400 °F) in the exposed wellbore environments such as sour production fluid, completion brine, and depending on metallurgical processing and microstructure externally exposed to SWCP at the seabed temperature.
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Precipitation-hardened nickel-based alloys have been used for decades in the oil and gas industry. Among these alloys, UNS1 N07718 has received the most attention for use in upstream applications such as tubing hangers, production stab plate, multiphase flowmeter bodies, and valve stems because of its performance in sour wellbore fluids (SWFs) and hydrogen-charging environments.
Directional drilling tools for oil and gas exploration is one industrial application where Manganese (Mn)-stabilized austenitic stainless steels with different amounts of other alloying elements like Chromium (Cr), Nickel (Ni) and Molybdenum (Mo) have found extensive use in spite of the demanding requirements in terms of mechanical properties and corrosion resistance. The limited resistance of this type of austenitic stainless steels to environmentally assisted cracking (EAC) in hot chloride (Cl-)-containing environments is well known. Chloride-bearing environments at elevated temperatures are not uncommon in drilling operations and can indeed challenge the EAC-resistance of CrMn-stainless steels
Fatigue and fracture of line pipe steels in a sour inhibited environment is presented. Fatigue crack growth rate (FCGR) was investigated as a function of frequency at several different K values at a pH of 3.5 and 0.21psia (0.00144MPa) H2S.