I'm using 316L. 3/8 flanges, 2" schedule 10 for the tube and bends. It's heavy stuff but I can walk next door to where I work and get the bends for around $5 each. It welds, smoothes, and polishes easy. The ID may be a little large at 2.15" but my next step down is 1.75" ID which I think is a little small for the 540 when that happens.
Thanks,
Kevin
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