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3.2 CO2 Corrosion Resistance
| (1) |
High Cr steels such as 13Cr stainless
steels are resistant to CO2 corrosion and
have been widely, and successfully used in wells
containing CO2 and CL-. |
| (2) |
Effect of Cr content and temperature on CO2 corrosion
are shown in Fig. 13CR & 13CRI critical temperature
is 150°C ; For 13 CRM & 13CRS is 175°C.
Duplex stainless steels (22Cr, 25Cr) have excellent
corrosion resistance up to a temperature of 250°C.
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Effect of CI- Density on Conventional 13Cr |
|
1% NaCI
(6000ppm CI-) |
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5% NaCI
(30000ppm CI-) |
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25% NaCI
(150000ppm CI-) |
 |
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Pitting occurs on Conventional 13Cr under
high- density. Max. density of CI-: 30,000ppm
and under |
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Effect
of Temp. under high density of CI- |
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Pitting occurs on Conventional
13Cr around 100 Deg.C, while no pitting
occuued on SM13CrM or S. |
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2006 Sumitomo Metals - Tubular Division. All rights
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