The study indicated that centrifugally-cast 12Cr-4Ni material exhibited hardness values up to HRC 40 in the weld metal in the as-welded condition. Upon post-weld heat treatment (PWHT), hardnesses decreased for all locations with maximum values of HRC at 26.5 in the weld metal. This was above the HRC 23 maximum guidelines for sour service indicated by NACE MR0175 for 12Cr-4Ni materials. Slow-strain-rate (SSR) tests indicated maximum susceptibility to cracking in condensed brine (1000ppm chloride) with hydrogen sulfide at 24 deg C, and only very limited cracking susceptibility in mixed brine with hydrogen sulphide at 167 deg C. Autoclave tests conducted in these environments using stressed-beam specimens showed susceptibility to SSC at 24 deg C in the base metal, heat-affected zone (HAZ), and weld metal. Maximum susceptibility was in the weld metal, producing complete failure in both as-welded and PWHT specimens. The base-metal specimens showed lower but still significant susceptibility to SSC. At 167 deg C, none of the 12Cr-4Ni beam specimens failed, showing substancial resistance to SCC.
Performance of 12Cr-4Ni alloy in simulated moderately-sour production environments
Verhalten von 12Cr-4Ni-Stahl in simulierter Umgebung mäßigsauer Erdölgewinnung
Corrosion Prevention and Control ; 45 , 1 ; 3-14
1998
12 Seiten, 8 Bilder, 6 Tabellen, 9 Quellen
Aufsatz (Zeitschrift)
Englisch
Spannungsrisskorrosion , Temperatureinfluss , Schwefelwasserstoff , hochlegierter Stahl , Schweißverbindung , Schweißzone , Wärmeeinflusszone , Rohrleitung , Erdöl , Kohlendioxid , Partialdruck , Chlorid , Wasserstoffversprödung , Wärmebehandlung , Härte , Mikrohärte , Dehnungsmessung , Metallographie , Simulation , unterirdische Rohrleitung , Chrom-Nickel-Stahl
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