I assume you'd want seamless (as opposed to welded) tubing. If you look inside the tubing, welded will have a slight ridge running down the length of it.
There is a "bell brass" alloy, I think, but how you'd go about getting tubing made of it I have no idea.
As far as aluminum tubing is concerned, you might try calling Kaiser Aluminum or Alcoa or such, getting one of their "application specialists," and asking them. The information you seek must be known, somewhere, but it may be hard to dig up.
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