NACE 0175-ISO 15156 - Solid stellite UNS 30006-for trim components of valves

[Viswa KN]

NACE 0175-ISO 15156 - Solid stellite UNS 30006

For the Nace standard ISO 15156,it doesnot lists the solid stellite UNS 30006 Solid stellite.In the past its been used a lot mainly as plug and seat in the valves.moreover its highy wear resistance and the field results are good.Whether shall we propose this grade.since its not listed can we consider that it does not have any issues in offering this for NACE H2S sour service.
Please help to clarify

Thanks
viswa

 

[SJones]

The end user will have to decide on the substantiating basis for considering the material qualified for H2S containing service. Part of this decision will involve an examination of the consequences of component failure.

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.

 

[nickypaliwal]

Asking for NACE compliance for hard facing of Stellite -6 probably does not make sense since NACE MR0175 compliance for filler material is a bit strange and I personally have never heard about.

Should it not be considered same as solid alloy since no testing other than hardness is asked after hard facing?

Also Solid Alloy6 R3006 particularly is not covered in NACE MR0175. Section for Co-Cr alloys discuss about specific alloy grades (R3003/R3004 etc) and does not have category for Co-Cr alloy in general such as Stainless Steel which has Austenitic Stainless Steel category.

Vendor states that Stellite 6 with NACE Compliance is not available so even if we ask them to comply to particular section (only hardness in this case) , they will not show NACE MR0175 compliance in the MTC.

@SJones - Can you please advise in above case and also your comments, if any?

 

[SJones]

@nickypaliwal - since the material is not addressed in ISO 15156-3, the end user has three choices when dealing with its selection:

1. Qualification by experience (ISO 15156-1, 8.2)

2. Qualification by laboratory testing (ISO 15156-1, 8.3)

3. Do nothing and keep fingers crossed, with even more crossing of fingers if the item is a pressure containing part

That is why alluded to consequences of failure in the posting above. If the end user can tolerate the risk associated with failure, then it doesn't become an issue.

Since it is the end user's responsibility to select and apply materials, it stands to reason that suppliers are unable to mark inspection documents as 'complying with ISO 15156.'

ISO 15156-3 does not address hard facing materials, only the substrate underneath.

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.

 

[nickypaliwal]

Thanks