The two most commonly used types of stainless steel nowadays are 304316 (or 1.4308 and 1.4408 corresponding to German/European standards). The main difference in chemical composition between 316 and 304 is that 316 contains Mo, and it is generally recognized that 316 has better corrosion resistance and is more resistant to corrosion than 304 in high-temperature environments. So in high-temperature environments, engineers generally choose 316 material components. But there is no absolute thing. In a concentrated sulfuric acid environment, no matter how high the temperature is, do not use 316! Otherwise, this matter would be a big deal. People who study mechanics have all learned about threads. Remember the black solid lubricant that needs to be applied to prevent thread bite under high temperatures: molybdenum disulfide (MoS2). From it, two conclusions can be drawn: [1] Mo is indeed a high-temperature resistant substance (do you use a crucible to melt Zhidao Huangjin? Molybdenum crucible!). [2] Molybdenum easily reacts with high valent sulfur ions to form sulfides. So no type of stainless steel is super invincible and corrosion-resistant. After all, stainless steel is a piece of steel with more impurities (although these impurities may be more corrosion-resistant than steel), which can react with other substances.