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51318-10799-Evaluation of the Effect of Oxygen on CRA Materials

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This paper will present the testing results and the effect of oxygen on Austenitic Stainless Steel Grade 316L, Duplex Stainless Steel (22% Cr DSS) and Super Duplex Stainless Steel (25% Cr SDSS).

Product Number: 51318-10799-SG
Author: Arwa Al Wahaibi / Talal Al Nabhani / Pedro Rincon Flores / Nassar Al Behalni
Publication Date: 2018
Industry: Corrosion Monitoring and Control
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Austenitic Stainless Steel Grade 316L, Duplex Stainless Steel (22% Cr DSS) and Super Duplex Stainless Steel (25% Cr SDSS) corrosion resistant alloy (CRA) are used extensively in water injection service for various applications such as process piping, pumps and valves. Currently the application of these materials is limited by many international standards to 10 Parts per Billion (ppb) of dissolved oxygen environments. However in actual plant operation of water systems, this limit could be exceeded due to various unavoidable upset scenarios also practically it is very difficult to control dissolved oxygen to less than 10 ppb. Higher grade materials (Nickle based alloys such as Alloy 825 or Alloy 625) are selected for oxygen corrosion resistance properties which result in increased cost, compared to stainless steel materials. The objective of this study was to do a systematic study to evaluate the performance of stainless steel (SDSS) in environments containing various dissolved concentrations (16, 100, 167 and 250 g/L NaCl). This paper will present the testing results and the effect of oxygen on CRA materials. The results show that SDSS material has better corrosion performance compares to other materials (316L, DSS) at various testing conditions.

Key words: corrosion resistance alloy, pitting, crevice corrosion

Austenitic Stainless Steel Grade 316L, Duplex Stainless Steel (22% Cr DSS) and Super Duplex Stainless Steel (25% Cr SDSS) corrosion resistant alloy (CRA) are used extensively in water injection service for various applications such as process piping, pumps and valves. Currently the application of these materials is limited by many international standards to 10 Parts per Billion (ppb) of dissolved oxygen environments. However in actual plant operation of water systems, this limit could be exceeded due to various unavoidable upset scenarios also practically it is very difficult to control dissolved oxygen to less than 10 ppb. Higher grade materials (Nickle based alloys such as Alloy 825 or Alloy 625) are selected for oxygen corrosion resistance properties which result in increased cost, compared to stainless steel materials. The objective of this study was to do a systematic study to evaluate the performance of stainless steel (SDSS) in environments containing various dissolved concentrations (16, 100, 167 and 250 g/L NaCl). This paper will present the testing results and the effect of oxygen on CRA materials. The results show that SDSS material has better corrosion performance compares to other materials (316L, DSS) at various testing conditions.

Key words: corrosion resistance alloy, pitting, crevice corrosion

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Determining the Dissolved Oxygen (DO) Concentration Limit for Safe Operation of CRAs in Saline Solution

Product Number: 51317--9062-SG
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Author: Qing Lu
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Study to assess pitting corrosion resistance of 316L ASS (UNS S31603) and 25%Cr SDSS (UNS S32750) in salt solutions containing dissolved oxygen(DO). The DO levels examined were: 20, 50, and 100ppb, and the concentration of chloride ions were up to 152g/L Cl-, at 50 and 60°C. The results are reported herein.
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Product Number: 51318-10798-SG
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An improved sour corrosion model was developed based on: • A bare steel sour electrochemical corrosion model, derived from published literature • Mechanisms that affect scale performance and trigger localised corrosion • A specific elemental sulphur degradation mechanism • Corrosion mitigation strategy

 
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