Metallurgical investigations on a welded sample of 25% Cr super duplex stainless steel (UNS S32750) from a vessel that had operated above 300-350°C (570-660°F) for six months, resulting in brittle fracture.
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Two super duplex stainless steels were investigated: a W-free (UNS S32750) and a 2.1 wt% W-containing (UNS S39274) grade. Goals: To study localized corrosion resistance of super duplex stainless steels and how W affects the same.
The effect of back shielding gas types and contained oxygen level on the corrosion resistance of welds was investigated for gas tungsten arc welding (GTAW) of UNS S32750 super duplex stainless steel (SDSS) pipes.
Laboratory testing on two candidate completion brines…a buffered mixed formate and a proprietary bromide brine. Materials tested: super martensitic stainless, super duplex stainless, API 5CT/ ISO 11960 grade “C125” casing and nickel alloy.
To evaluate through fracture toughness tests the susceptibility of SDSS to HISC and to determine the effect of the cathodic protection potential and the stress intensity factor rate (K-rate).