Currently the most commonly used two kinds of stainless steel are ss304 and ss316 (or corresponding to the German / European standard 1.4308, 1.4408), the biggest difference between ss316 and ss304 in chemical composition is that ss316 containing Mo. Generally ss316 is of better corrosion resistance than ss304 in high temperature environment. So in the high temperature environment, engineers will generally choose 316 parts. But in the context of concentrated sulfuric acid, ss316 is not suitable even though the temperature is very high! Otherwise it could cause big trouble.
[1]Mo is a kind of material that is resistant to high temperature
[2]Molybdenum is easy to react with high sulfur ions to produce sulfide.
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