High temperature stainless steel tube with thin wall
High temperature stainless steel tube with thin wall
(OP)
I am finding it difficult to source 309 or 310 stainless steel tube with wall thickness less than 1.5mm (0.059") for outside diameter 15-22mm (0.56-0.866")
Used in a high temperature application (800C) formed into coils. Environment is low pressure steam and air.
So far I have only found schedule 40 pipe which is too heavy to be bent into coils.
I have done preliminary work with 316 ss to prove priciple but difficulty was cracking in the pipe.
Anybody know of source of 309 or 310 thin walled tube?
Many thanks
Used in a high temperature application (800C) formed into coils. Environment is low pressure steam and air.
So far I have only found schedule 40 pipe which is too heavy to be bent into coils.
I have done preliminary work with 316 ss to prove priciple but difficulty was cracking in the pipe.
Anybody know of source of 309 or 310 thin walled tube?
Many thanks





RE: High temperature stainless steel tube with thin wall
RE: High temperature stainless steel tube with thin wall
Unless there is existing industry demand such as exhaust pipes which dosnt go below 1". I need less than 3/4.
I'm sure ther is some out there. Finding it is a problem.
Thanks
RE: High temperature stainless steel tube with thin wall
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
RE: High temperature stainless steel tube with thin wall
In any case the vendor I have been using to make up coils puts a limit of 1.5mm wall thickness for the coils I need. I am not sure of their process but so far I have been satisfied with their work.
Another vendor may be capable of coiling thick wall tube but so far I have not had any luck.
Coils are 230 mm dia. with a 19 mm o.d. tube.
RE: High temperature stainless steel tube with thin wall
Never looked for 309 or 310 but 5/8" tubing should be available.
Alloy 600 definitely is available and might be worth considering too.
There are re-draw operations out there who will draw down larger tubes- usually for a hefty price and for a minimum order in the hundreds of feet.
RE: High temperature stainless steel tube with thin wall
You can get .028" wall 316 and 304 from 5/8" down to 1/16". Plenty of other wall thicknesses also, but sizes can get scarce.
RE: High temperature stainless steel tube with thin wall
I believe each continent has it's own 'typicals' (the germans e.g. may easily supply you 316Ti, which alomost equals 321).
For piping, 321 usually comes in dual certified 321/321H, Id reckon that may be the case too for tubing, but you'd have to check. We usually get 321 tubes from the American continent.
RE: High temperature stainless steel tube with thin wall
316/316L dual certified, because you can have the strength of the normal carbon grade while still meeting the low carbon spec., but you can't have 316/316H dual certified.
You're right about the regional variations in material- 316Ti is impossible to find here.
RE: High temperature stainless steel tube with thin wall
You can have 316/316H dual certified- 316H is definitely higher carbon than 316L but more so it has defined properties that need to be met as much as 316 just overlaps those properties.
RE: High temperature stainless steel tube with thin wall
Flanges are more difficult to obtain in 321/321H, but Ive seen them on a recent job.
Tube I dont know of, but reviewing e.g. A213 I dont see how they cant be dual certified, from a chemical composition point of view