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What is the correct type of material, 304L or 316L stainless steel tubing, for transport argon gas? Is it required to be an electro-polished finished?

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    $\begingroup$ What are the legal requirements in your location? As you should know those and meet or exceed them. $\endgroup$ – Solar Mike Jun 19 '17 at 5:54
  • $\begingroup$ Keep in mind that argon is inert. It's not going to react to just about anything you make a tank out of. $\endgroup$ – Olin Lathrop Jun 19 '17 at 12:37
  • $\begingroup$ If pressure permits, copper tubing will work fine. I have used copper for tubing for 1800 psig helium. $\endgroup$ – blacksmith37 Jun 19 '17 at 15:27
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The mechanical and manufacturing properties of 304 and 316 are not greatly different and both have good weld-ability (for stainless). The main difference is that 316 has a bit better corrosion resistance and is genreally rated as performing better in more corrosive environments (salt spray etc).

Having said that industrial argon cylinders are generally non-stainless so unless there are other considerations either should be fine in principal.

However, as noted in comments there are usually strict regulations associated with the design and manufacture of pressure vessels and anything used with high pressures may well need to be certified. This is greatly simplified for piping is you specify a grade which is already certified for its intended use along with the appropriate fittings and connectors.

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