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Hydrogen Sulphide effects on low alloy steels up to 36Rc

Hydrogen Sulphide effects on low alloy steels up to 36Rc

(OP)
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.

RE: Hydrogen Sulphide effects on low alloy steels up to 36Rc

It depends; If it is a clean Cr:Mo with low Mn and very low Ni, double water quenched and tempered , with exceptionally fine grain ( like 10 or smaller ) , It will have very good resistance to H2S. This is the type material that meets API T-95 . There may be C-100 and C-105 grades today ( I have been retired awhile). But I don't know what you do for components other than tubulars.

RE: Hydrogen Sulphide effects on low alloy steels up to 36Rc

There are two answers to the question:

1. How long is a piece of string?

2. How lucky does your client feel?

Your client will, ultimately, be duty bound to heed the requirements of ISO 15156-2 unless they can come up with a satisfactory case to justify otherwise. Thus, you and they may like to refer to Figure B.1 of the ISO document.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: Hydrogen Sulphide effects on low alloy steels up to 36Rc

Regarding time to fail : Using the NACE smooth tensile bar method, for the materials that failed, 90% of failures occurred within 200 hours . Some did occur within 24 hours ( can't remember a percentage).

RE: Hydrogen Sulphide effects on low alloy steels up to 36Rc

(OP)
Thanks for replays! North Sea wells are mostly on 4000m depth.

RE: Hydrogen Sulphide effects on low alloy steels up to 36Rc

@pitrer - your only out will be to achieve grade and temperature compliance with ISO 15156-2, Table A.3. You may also wish to check your concentration conversions.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

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