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Corrosion Behavior of UNS N08935 In Refinery Sour Water Services

Picture for Corrosion Behavior of UNS N08935 In Refinery Sour Water Services
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Product Number: 51321-16831-SG
Author: Karen Picker; Josefin Eidhagen; Jonas Howing
Publication Date: 2021
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$20.00
$20.00

The nature of hydroprocessing reactor effluent air coolers (REAC's) to form hydrogen sulfide (H2S) and
ammonia (NH3) from sulfur and nitrogen species present in the feed makes them prone to ammonium
bisulfide (NH4HS) corrosion. Various industry driven research have helped understand the relationship
between the hydrogen sulfide or the ammonia partial pressure with NH4HS concentration and their
impact on the corrosion rate of several alloys in these services. Nowadays, the significance of flow
rates, temperatures, H2S and NH3 present in the system have been well established and the corrosion
performance of duplex stainless steels, or nickel grades, such as Alloy 825 and Alloy 625, in these
environments have been widely accepted throughout the refining industry.
This study demonstrates the corrosion performance of UNS N08935 in refinery sour water services. Tests
have been performed in H2S-dominated environments with different NH4HS concentrations. A total of six
different H2S-dominated environment environments are tested with three different H2S partial pressures.
The NH4HS concentrations ranges between 5-30 wt%, two different temperatures are used and both
stagnant and flowing conditions are evaluated. The results from these tests is showed comparing different
alloys ranging from super duplex stainless steels to nickel base alloys exposed to the same conditions.

The nature of hydroprocessing reactor effluent air coolers (REAC's) to form hydrogen sulfide (H2S) and
ammonia (NH3) from sulfur and nitrogen species present in the feed makes them prone to ammonium
bisulfide (NH4HS) corrosion. Various industry driven research have helped understand the relationship
between the hydrogen sulfide or the ammonia partial pressure with NH4HS concentration and their
impact on the corrosion rate of several alloys in these services. Nowadays, the significance of flow
rates, temperatures, H2S and NH3 present in the system have been well established and the corrosion
performance of duplex stainless steels, or nickel grades, such as Alloy 825 and Alloy 625, in these
environments have been widely accepted throughout the refining industry.
This study demonstrates the corrosion performance of UNS N08935 in refinery sour water services. Tests
have been performed in H2S-dominated environments with different NH4HS concentrations. A total of six
different H2S-dominated environment environments are tested with three different H2S partial pressures.
The NH4HS concentrations ranges between 5-30 wt%, two different temperatures are used and both
stagnant and flowing conditions are evaluated. The results from these tests is showed comparing different
alloys ranging from super duplex stainless steels to nickel base alloys exposed to the same conditions.

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This Phase II work in NH3-dominated sour waters studied the impact of several process variables including NH4HS concentration, NH3 partial pressure, H2S partial pressure, temperature, cyanide concentration, and velocity (wall shear stress).
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UNS N08935 is a new versatile super austenitic alloy with extreme pitting resistance as indicated by its pitting resistance equivalent number (PREN) of 52. It can be used in a broader temperature range than superduplex and hyperduplex stainless steels, offers good weldability and is more cost-effective than Nickel-based materials which make the grade a good candidate for O&G applications, refineries, and chemical industries.1,2
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