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Titanium stringers in 321 tainless steel

Titanium stringers in 321 tainless steel

Titanium stringers in 321 tainless steel

(OP)
What causes titanium stringers in 321 stainless steel?
Is 347 (niobium stabilized) preferable?

Material requirement should contain 0.01%Co & 0.08%Mn ideally.

Any info 321 versus 347 would be appreciated.

RE: Titanium stringers in 321 tainless steel

This would be special virgin melt (triple the price) to get Co that low, and I am not sure that you can ever get the Mn that low.  This material would be a bitch to hot work.
Why on earth would you want 321 for this?  Low carbon will achieve the same thing with a cleaner alloy.

You will always get agglomeration of carbo-nitrides, Ti or Nb it doesn't matter.  There will be some banding or stringers.

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Plymouth Tube

RE: Titanium stringers in 321 tainless steel

We have both 321 and 347 stainless steel superheater tubing and I have not observed any stringers in this material. If properly processed the Ti (C,N) should be large precipitates, not bands or stinrgers,  

RE: Titanium stringers in 321 tainless steel

These are sure not for superheaters.

If there is a large amount of cold work you can break up the agglomerations.  Plate of tubing without much cold reduction can show significant banding.

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Plymouth Tube

RE: Titanium stringers in 321 tainless steel

XLR8ing hasn't specified the application at all. If application is important, maybe we should wait for the details.  

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