Post Weld Stress Relieving of 310SS

[mmagg]

I have a ring burner design that is composed of a rolled pipe that is sealed using a butt welde "tee" fitting. In the past I have seen failures in this design at the weld joint between the rolled pipe and tee. The ring and tee do experience direct flame contact and I am looking at changing the material from 316L SS to 310 SS with a post weld stress relief operation. I have read some literature that states that stress relieving 310SS is not benefical while some others state that it is. I would like to know if it is worth specifing a stress releive operation on the design.

 

[metengr]

Post weld heat treatment is not necessary for this application.

 

[Guest102023]

It would be helpful (essential actually) to know how and why the part failed previously. Don't fire magic bullets at a problem until you know more.

 

[mmagg]

brimstoner,

All I have is an photo of the burner showing one of the welds of the tee severed and a statement from an associate that there has been failures like this in the past. We do see flame impingment on other similar burner rings in other installations.

 

[EdStainless]

If the failure was related to sensitization, secondary phases, or corrosion then the change to 310 will help.
If the failure was thermal fatigue then it will not help. In that case you would be better off with a ferritic grade.

Don't bother with stress relief. The only way to do it is a full solution anneal. Then if your cooling is uneven you will reintroduce high stress.

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Plymouth Tube

 

[Guest102023]

p.s.,
a full solution anneal will probably nullify your Code WPS