A36 is common in plate and bar stock but you'll be hard pressed to find it in HSS so no sense recommending it to a guy looking for HSS to build a tank stand. 44W (or the Canadian version 300W) is sometimes available and 50W (Canadian 350W) is also sold in HSS stock. I wish I had a dollar everytime an Engineer specified a material grade/shape combination that doesn't exist.
This technical jargen doesn't mean a roll of beans to our guy that's looking to build a stand. I think it's safe to say whatever grade he buys as long as it's plenty thick and sized right (Grizz had it right with the 1.5 or 2" x .188 HSS) and has it welded true and square by someone that is a decent welder, there will be no issues. I've seen so many stands that the welding looked like a bird crapped on it, and they held (God only knows how) so the key is not to Engineer it to the minimum, overbuild it so there's no chance of it falling apart.
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