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51313-02531-SCC Mechanism of UNS S31803 Duplex Stainless Steel Under High H2S-CO2 Pressure with High Cl– Content

Product Number: 51313-02531-SG
ISBN: 02531 2013 CP
Author: Jinhui Ding
Publication Date: 2013
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The stress corrosion cracking(SCC) behavior of duplex stainless steel(DSS) in H2S-Cl- environment has been discussed for a long time. However the high H2S-CO2 pressure and the high Cl- content can coordinate to cause severe pitting or SCC of DSS. There has been limited information on the mechanism of SCC of DSS under high H2S-CO2 pressure with high Cl- content.


In this paper SCC of 2205 DSS was investigated under different H2S-CO2 pressures (300kPa H2S + 200kPa CO2 600kPa H2S + 400kPa CO2 900kPa H2S + 600kPa CO2) with 150000ppm Cl- at 60?. Four-point bend test method and scanning electron microscopy analysis were combined to investigate the SCC mechanism of DSS. The effect of high H2S-CO2 pressure on SCC mechanism was discussed. The results indicated that under lower H2S-CO2 pressure cracks initiated and propagated at pitting areas which were caused by anodic dissolution mechanism. Under 900kPa H2S + 600kPa CO2 except the pitting assisted cracking areas there also existed some hydrogen-induced cracking at crack terminals. The higher H2S-CO2 pressure can both facilitate hydrogen-induced cracking and aggravate anodic dissolution.
 

The stress corrosion cracking(SCC) behavior of duplex stainless steel(DSS) in H2S-Cl- environment has been discussed for a long time. However the high H2S-CO2 pressure and the high Cl- content can coordinate to cause severe pitting or SCC of DSS. There has been limited information on the mechanism of SCC of DSS under high H2S-CO2 pressure with high Cl- content.


In this paper SCC of 2205 DSS was investigated under different H2S-CO2 pressures (300kPa H2S + 200kPa CO2 600kPa H2S + 400kPa CO2 900kPa H2S + 600kPa CO2) with 150000ppm Cl- at 60?. Four-point bend test method and scanning electron microscopy analysis were combined to investigate the SCC mechanism of DSS. The effect of high H2S-CO2 pressure on SCC mechanism was discussed. The results indicated that under lower H2S-CO2 pressure cracks initiated and propagated at pitting areas which were caused by anodic dissolution mechanism. Under 900kPa H2S + 600kPa CO2 except the pitting assisted cracking areas there also existed some hydrogen-induced cracking at crack terminals. The higher H2S-CO2 pressure can both facilitate hydrogen-induced cracking and aggravate anodic dissolution.
 

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