Where does the question about cladded tube sheets come from? I couldn’t find the source anywhere.
Thread Content
Is this rule still in effect? I didn’t choose the ultra-low carbon option even after looking at the previous pictures.
The transition layer metal has requirements regarding the ferrite content; ultra-low carbon is not acceptable
Chemical equipment design—heat exchangers, should be
Thank you for your reply. What are the requirements regarding the ferrite content? Are they related to the chemical composition and microstructure of the coating on the composite tube sheet?
It contains information on surfacing welding, and heat treatment is mentioned, but ultra-low carbon welding materials are not
Heat treatment is required after cladding; low carbon content is necessary to avoid the formation of sensitive areas, otherwise the material will lose its corrosion resistance after heat treatment
I think this question isn’t formulated very carefully; there are no standard regulations requiring that cladded tube sheets be heat-treated, and not all of them need to be heat-treated.
The standards don’t specify anything clear; it’s all based on experience – it depends on how well one masters it!
Typical designs will specify heat treatment in the drawings
:Lol, I think designers shouldn’t be the ones to choose the welding materials. . .