welding of SS321 and SS316Ti
welding of SS321 and SS316Ti
(OP)
I'm designing Furnace transfer line to crude column
The design Temp. is 390 degrees C and The designed material of the line is SS316Ti. I found our pipe fitting vendor shipped one of the elbows with SS321.
Please give me a clue if it's okay to use in terms of both the design condition-wise and weld-ability.
Many thanks to you in advance.
The design Temp. is 390 degrees C and The designed material of the line is SS316Ti. I found our pipe fitting vendor shipped one of the elbows with SS321.
Please give me a clue if it's okay to use in terms of both the design condition-wise and weld-ability.
Many thanks to you in advance.





RE: welding of SS321 and SS316Ti
RE: welding of SS321 and SS316Ti
But I wouldn't. If 321 was good enough from a corrosion point of view no one would have speced 316Ti (bastard that it is) for this service.
Get the correct part.
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P.E. Metallurgy, Plymouth Tube
RE: welding of SS321 and SS316Ti
CRES 316Ti alloy is a bit unfamiliar: what spec/spec-allowance is there for this variation? Is there suitable test/allowables data for the welding of this alloy?
Also,
Is 316Ti a low-carbon version [316L] that is more suitable for welding?
NOTE.
In aerospace, when welding is crucial, CRES 321 is the [AISI] alloy of choice... followed by 347. However, I am all-too-aware, that WHAT the CRES alloy is exposed-to, in-service, makes a huge difference in alloy selection, overall... as long as the fabrication methods are suitable for developing final properties.
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true.
o For those who believe, no proof is required; for those who cannot believe, no proof is possible.
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion"]
o Learn the rules like a pro, so you can break them like an artist. [Picasso]
RE: welding of SS321 and SS316Ti
Seek and ye shall find;
thread330-87879: 316/316L versus 316Ti
RE: welding of SS321 and SS316Ti
OK OK OK... Read the thread You referenced: however, it did NOT point to any discrete specifications [ASTM, ASME, AMS, SAE, etc] for 316Ti.
Ahhh... Google Search helped... 316Ti [UNS S31635] appears to be made per following non-aerospace specifications, thus...
ASTM A 240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
ASTM A 276: Standard Specification for Stainless Steel Bars and Shapes
ASTM A 959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Still struggling to understand properties of 316Ti in relationship to welding and high heat exposure/resistance to the specified fluid [crude...?]
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true.
o For those who believe, no proof is required; for those who cannot believe, no proof is possible.
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion"]
o Learn the rules like a pro, so you can break them like an artist. [Picasso]
RE: welding of SS321 and SS316Ti
The use of 316Ti over 316 is largely a local issue.
316Ti should have better weld corrosion resistance, and it comes in handy to resist sensitization in higher carbon versions (316H).
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P.E. Metallurgy, Plymouth Tube