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Delta-ferrite content in SS Type 347 weld overlay

Delta-ferrite content in SS Type 347 weld overlay

Delta-ferrite content in SS Type 347 weld overlay

(OP)
Hi everybody,
we are about to start with the fabrication of a 21/4Cr-1Mo pressure vessel for the petrochemical industry.
Customer's technical specification gives acceptance criteria for delta-ferrite content in stainless steel overlay: the limits in PWHT condition are 3-10% for type 308 or 316 weld metal and 6-10% for 347 weld metal.

Why is the minimum limit higher when 347 SS is used?
I remember hearing that 347 has a hiogher tendency to hot cracking than other SS because of low-melting components formed by Nb(Cb); is this the reason for the higher required delta-ferrite content?

RE: Delta-ferrite content in SS Type 347 weld overlay

(OP)
I've found the answer in thread725-139524.
In case anybody had some additional info, please reply.

Thanks

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