ASTM A351 CK3MCuN is a 6% Mo Super

[pnrngv]

ASTM A351 CK3MCuN is a 6% Mo Super Austenitic Grade of Stainless Steel. For the Gas flowline service with 5.22% mole H2S, is this material is suitable for the service? How can we interpret this with ISO 15156-3 Standard. Please suggest

 

[SJones]

By consulting Table A.8 and confirming that the heat treatment conditions and 100 HRB hardness maximum criteria are met whilst assessing whether:

a) there is less than 50 ppm of chloride in the fluid stream

or failing that

b) that the temperature does not exceed 60 deg C and that the partial pressure of H2S, calculated in accordance with Annex C of ISO 15156-2 and Technical Circular 1 Link does not exceed 100 kPa



Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

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

 

[pnrngv]

Thanks for the suggestion.

But, as per table A.8 ISO 15156-3 it is mentioned as "Material have been used without restriction on P H2S, temperature , pH in production environment. Only Chloride Conc. Max 50 mg/l to be checked. If the temperature is exceeding on the 60 Deg C, can we interpret second row of Table A.8. Please advice.

 

[SJones]

It's either a) or b). So, if you exceed 60 deg C and/or 100 kPa pH2S, then you will either have to have up to 50 ppm chloride, or, if not, you will have to undertake qualification corrosion testing.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

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

 

[pnrngv]

Thanks Steve Jones for the expert advice. This really Helps !!