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304. We use 316 on off shore platforms. Other than that, 304 should be fine.
316 is stronger and good for higher temps, and it is a lot harder and tougher to machine. So manufacturing costs are higher as well as material cost.
You might also consider, if you can find it, 6063-T6 aluminum. It is extremely corrosion resistent, light and strong. 6061-T6 is 1/3rd the weight of steel and has similar strength. Either of these would be easier to drill and about 1/2 the cost of 316 Stainless.
What size are the vertical posts?
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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