A test program was conducted to qualify welded super 13%Cr (S13%Cr) stainless steel for the Åsgard Field, a mildly sour service. The test program involved girth welding, optimization of post weld heat treatment (PWHT) cycles, assessment of mechanical properties, examination of low cycle fatigue testing, and different corrosion testing and evaluation of S13%Cr steels from three different steel mills.

The alloy with 0.015%C max, 11.9%Cr min, 2.4%Mo min and 6.0%Ni min, has been qualified for use as flowline material in the actual field. The results show acceptable weldability and corrosion properties. Post weld heat treatment (PWHT) of the welds improved the resistance against sulfide stress corrosion cracking.

Subject
Test methods, Pipe surfaces, Corrosion failures, Water, Materials, Welding, Corrosion cracking, Partial pressures, Acidity, Condensed water, Specimen preparation, Steel, Chlorides
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1999
Association for Materials Protection and Performance (AMPP)
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