This subject was partially closed in thread330-25461: Hydrogen Sulphide effects on low alloy steels up to 36Rc, but it will be good to know how long HRC 30-36 (or grater than 22) will survive in lower concentration of H2S. For North Sea wells will be 350-1000ppm (0.00035%-0.001%). This will probably make some difference on material survival to 2% of H2S from cited in the other post. Some of my clients are required to use non H2S steel (due to strength) for short operation(up to 24hours) in low H2S wells.
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