Abstract

The carburization resistance of several wrought, commercial Ni- and Fe-based alloys were tested at 9820C in Ar-5%H2-2%C3H6 for 215 h. To avoid variability in test results often found when using CH4 as the carburizing gas, this study used C3 H6 to simulate the carburizing atmosphere. All of the alloys selected in this study are Cr2O3-scale forming alloys except UNS N12160 which forms a subscale of SiO2 beneath an external Cr2O3 scale. The analysis focused on metal recession measurements and characterization of the external and internal corrosion products using SEM/EDS. Included in the test matrix was a new Ni-31.5Cr-5.6Mo-3.8Cu alloy developed for metal dusting resistance (which for the purposes of this paper will hereafter be referred as NiCrMoCu). It was found that the Si-containing, UNS N12160 outperformed the rest of the alloys tested. The Cr2O3-scale forming NiCrMoCu also showed a relatively low amount of internal carburization.

Keywords:
subsurface corrosion, internal carburization measurement, texas 77084, flowline corrosion, riser corrosion, carburization, intragranular carburization, pipeline corrosion, well integrity, cr content
Subjects:
Pipelines, Flowlines and Risers, Materials and corrosion, Well Integrity, Subsurface corrosion (tubing, casing, completion equipment, conductor)
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2015. NACE International
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