I have gone through PWHT procedure followed by Vendor in one of our Project for cladded equipment. even though SS cladding is there vendor has kept holding temperature upto 620°C (as per CS base material requirement). whether sensitization phenomenon should look into this or not. Because at this much temperature SS cladding may get sensitize and its property may get inferior.
As per UCL-34 cautionary note
Postweld heat treatment may be in the carbide-precipitation range for unstabilized austenitic chromium–nickel steels, as well as within the range where a sigma phase may form, and if used indiscriminately could result in material of inferior physical properties and inferior corrosion resistance, which ultimately could result in failure of the vessel.
Postweld heat treatment may be in the carbide-precipitation range for unstabilized austenitic chromium–nickel steels, as well as within the range where a sigma phase may form, and if used indiscriminately could result in material of inferior physical properties and inferior corrosion resistance, which ultimately could result in failure of the vessel.
Can any body tell how to take care in such situation ?
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