[MW:3065] hydrogen disbonding for SS clad at 530 deg C

Dear all,

I have a vessel SS 347 clad on P4 material. The vessel is to be used
in H2s service at a temperature of 530 deg C. Specification is asking
for autoclave/ H2 disbonding test for weld overlay. what are the
basis to decide for the test? Is it neccessary to do at 530 deg C or
there is any other permutation or combination to do the test at lesser
temp?

If yes please guide
regards,
Amarjit singh

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