Can anyone identify this metal tubing?

[NTwoO]

Hi, I have a tube that was bought from a lot of stainless and other stuff. This one was unknown On the tubing it states:
"SUMITOMO METALS DIN17458-1 4435 TFSI CLASS 2 S M 25x1.5 OYYES135 LOT NO AO1 HEAT NO. D892303 OT QA"
The guy said it was Ti, but it is not greyish, but a silverish/stainless colour. He had no use for it, so added it to the lot for free

 

[series2]

Try welding to it, if it catches fire it's magnesium alloy, if it turns a nice shade of purple it's titanium

Seriously though, have you checked to see if it's magnetic? or will rust?

I just googled it and got this:-

http://www.tps-technitube.com/Catalogues/Files/SEAMLESS.pdf

It would appear to be seamless stainless steel tube, special order.

 

[NTwoO]

OK, I just found a german site with a reference that it is X 2 CrNiMo 18 14 3

 

[NTwoO]

AHA! TP 316L-Mo from the sheet you linked!

 

[TechnicAl]

Its 316L but its composition is aimed at the top end of the 316L spec (slightly higher alloyed)