Stress corrosion cracking susceptibility of duplex stainless steels in sour gas environments

Journal Article · Wed Jun 01 04:00:00 EDT 1983 · J. Mater. Energy Syst.; (United States)

DOI:https://doi.org/10.1007/BF02833502· OSTI ID:5598748

Rhodes, P R; Abrego, L; Welch, G A

The stress corrosion cracking (SCC) susceptibility of duplex stainless steel tubulars in oxidant-free NaCl/H/sub 2/S solutions simulating downhole sour gas well environments has been evaluated. The alloys tested had compositions of 21 to 25% Cr, about 5% Ni, and about 3% Mo and included both annealed and cold reduced products. The SCC tests were conducted in autoclaves pressured with H/sub 2/S/CO/sub 2/ and H/sub 2/S/CO/sub 2//CH/sub 4/ gas mixtures. Test specimens included a variety of statically loaded specimens (U-bends, C-rings, notched C-rings, tensiles, and precracked double cantilever beams) as well as dynamically strained specimens. SCC susceptibility increased with yield strength, comparing specimens stressed to their yield point. In Cl/sup -//H/sub 2/S solutions free of oxidants, SCC initiated under anodic (pitting corrosion) rather than cathodic conditions, similar to a Cl/sup -//H/sub 2/S synergism promoting both pitting and active corrosion. SCC susceptibility was measured over the full range of test temperatures: 23/sup 0/C to 288/sup 0/C. The composition-temperature region of SCC immunity has been partially defined and is largely dependent upon minimizing the H/sub 2/S partial pressure, NaCl content, and the acidity established by the CO/sub 2/ partial pressure.

• Research Organization: Shell Development Company Houston, TX
• OSTI ID: 5598748
• Journal Information: J. Mater. Energy Syst.; (United States), Journal Name: J. Mater. Energy Syst.; (United States) Vol. 5:1; ISSN JMSMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALKANES
ALLOYS
ANNEALING
AUTOCLAVES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM
CHROMIUM ALLOYS
CORROSION
CORROSION RESISTANT ALLOYS
CRACKING
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HALIDES
HALOGEN COMPOUNDS
HEAT TREATMENTS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALS
METHANE
MOLYBDENUM
NATURAL GAS
NICKEL
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PITTING CORROSION
PRESSURE DEPENDENCE
PYROLYSIS
SODIUM CHLORIDES
SODIUM COMPOUNDS
STAINLESS STEELS
STEELS
STRESS CORROSION
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
YIELD STRENGTH