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Bolt material for high temperature and H2S

Bolt material for high temperature and H2S

Bolt material for high temperature and H2S

(OP)
Refer to NACE MR0175, acceptable bolt material for H2S service is A193-B7M.

In case of high temperature, A193-B16 should be better for strength concern. However, A193-B16 is not indicated in NACE MR0175.

Which is suitable material for high temperature and H2S service? Please comment.

RE: Bolt material for high temperature and H2S

Here you face a dilemma: if the bolts don't comply with A.2.1 you either go back to those that do and derate the equipment; or, you go for those that don't and prove their resistance by testing or documented experience.

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/

RE: Bolt material for high temperature and H2S

This is not my comfort area, so let's see if someone else can back this up or shut it down.

Can you consider a stainless system like A-193-B8M?  My "charts" indicate them to be good in corrosive environments and up to 1500 deg F.  MR-0175 para 3.5.1 accepts austenitic stainless steel to within 22 HRC maximum and these studs are austenitic.

Can anyone reinforce this??

RE: Bolt material for high temperature and H2S

Assuming that we are discussing 'exterior' bolting that will only be exposed to H2S containing fluid during a loss of containment, then the above option is feasible if the necessary strength and temperature ratings can be achieved with 22HRC material. If it's a continuous immersion scenario, with mixed materials - it probably would not be advisable.

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/

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