DIN 1.4441 UNS S31673 Stainless Steel Tube For Surgical Implants Pipe Ni 14%

The two most commonly used stainless steel 304, 316 (or corresponding to the German / European standard 1.4308,1.4408), 316 and 304 in the chemical composition of the most important difference is that 316 contains Mo, and generally recognized, 316 corrosion resistance is better than 304 in high-temperature environment more corrosion-resistant. So in high-temperature environment, engineers will generally choose 316 material parts. But the so-called thing is not absolute, in the concentrated sulfuric acid environment, and then the high temperature do not use 316. Learn mechanical people have learned thread, remember in order to prevent thread galling at high temperatures, you need to apply a black solid lubricant: molybdenum disulfide (MoS2), from which we can draw two conclusions: one: Mo is indeed a high-temperature-resistant substances (know what crucible gold melting? Molybdenum crucible!) ). Second: molybdenum is easy to react with high-valent sulfur ions to generate sulfides. So there is no stainless steel is super invincible corrosion resistance. In the end, stainless steel is a piece of impurities (but these impurities can be more resistant to corrosion than steel) more steel, steel can react with other substances.