Welding of 316SS flange to 310SS pipe - any issues?

[ibraag]

Folks, one of our suppliers proposes to weld 316SS flange to 310SS flare tip assembly because they cannot obtain 310SS flange in time for our needs. The flare is designed to burn H2S. The flange they are talking about is at the bottom of the tip, i.e. away from the flames. Is anyone aware of any issues of welding 316SS to 310SS? I know 316SS is not suited for high temperature, but it may be OK as it is some distance apart from the flames.

 

[metengr]

I would suggest you use either 321H or 347H for the flange material. Suggested filler metal would be 310H SS.

 

[EdStainless]

The 316 will have lower strength at high temp. You need to check the actual exposure temp.

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Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net

 

[unclesyd]

I just checked on a process we had where we welded 316 SS flanges to 310 SS. It was on the manifold of the reformer in a Gerbitol H2 plant. All the piping was 310 SS and the flanges were 316 SS RTJ. The welding electrodes was 310Mo made by Mckay. The 310 piping was welded to the HK40 reformer tubes with 310H.

I can't recall the exact temperature but it was in excess of 1200F.

 

[EdStainless]

As long as your flange design is done with the lower strength in mind you should be fine, but double check the flange defections.

= = = = = = = = = = = = = = = = = = = =
Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net