1 Introduction
2 Experimental Procedure
C [wt%] | Si [wt%] | Mn [wt%] | P [wt%] | S [wt%] | Cr [wt%] | Ni [wt%] | Mo [wt%] | N [wt%] | Fe [wt%] |
---|---|---|---|---|---|---|---|---|---|
0.027 | 0.53 | 1.60 | 0.025 | 0.001 | 22.23 | 5.18 | 3.16 | 0.193 | Bal |
SMYS | YS | UTS | A | |||
---|---|---|---|---|---|---|
[MPa] | [ksi] | [MPa] | [ksi] | [MPa] | [ksi] | [%] |
758 | 110 | 822 | 119 | 885 | 128 | 16.5 |
3 Results
4 Conclusions
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No cracks occurred under the constant load of 90% SMYS within 30 days of testing in rotated autoclaves containing up to 100 bar hydrogen gas with or without brine (15,000 mg/l chloride).
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The 2205 duplex stainless steel (UNS S31803) did not show a corrosive attack after the immersion in brine with CO2 at 25 °C and 80 °C (evaluation with stereo microscope).
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The presence of brine was found to promote hydrogen uptake.
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A temperature of 80 °C led to significantly higher hydrogen contents in the specimens exposed to 20 or 100 bar H2 gas and brine compared to 25 °C.
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A maximum hydrogen content of 14.21 ppm (uptake of 11.96 ppm) was found in the test with 100 bar H2 and brine at 80 °C after 30 days.
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In the hydrogen uptake, significant differences to other steels were measured. The two-phase α‑γ-microstructure and thus the individual solubility and diffusion behaviour as well as the different corrosion potential have a decisive influence on the hydrogen uptake during the 30 days of testing.
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The 2205 duplex stainless steel (UNS S31803) seems to be suitable for application in an underground microbiological methanation facility.