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Solution annealing of 304H S.S.

Solution annealing of 304H S.S.

Solution annealing of 304H S.S.

(OP)
Hi All,

This has already been posted in metal section but I thought you equipment guys might have some experience with this.


I would like to hear some opinions and advise on doing solution annealing of Type 304H aust. S.S. in the field.

I have a 43" ID x 3/4" thk. pipe section (line) in an FCCU operation.  50 psi design pressure, 1385 F design temp.  Portions of the line has an elbow made from 304 material piping dating back to 1970 and some 304H piping from the 1990 & 1993 refitting.  

It is known the aged elbow from 1970 has suffered from sigmatization and thus is embrittled.  No metallograph was done for the newer stuff so I don't know.  I'm sure they have been senitized, but it does not matter since this service is only flue gas.

I susgested to cut away the stuff from 1970 and some parts from the 1990 and weld on new replacements for other mechanical reasons which I don't need to discuss here.  All the future field weld joints will be at the newer materials (1990 and onward).

The questions is, after cutting off the piping parts must I do field solution annealing to bring back the mechanical properties of the S.S. (to almost like new condition) before I weld on the new parts?  

A study done before my work suggests it needs to be done otherwise, the welder will be "chasing cracks" after welding.  I say, we don't have to solution anneal for the joints at the "newer" (1990 onward) materials.  I have my reason for that but I will keep it to myself for now until I hear any respondent.

Thanks for reading and hope to hear some expert opinion and past experiences.

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