Teach you how to choose the bimetallic thermometer parts material

As a professional bimetallic thermometer manufacturers, we all know that bimetallic thermometer shell material is mainly stainless steel, but the 304 and 316 are two kinds of specifications of the stainless steel material. In the production of bimetal thermometer, now the most commonly used two kinds of stainless steel 304316 ( Or corresponding virtue/the mark 1. 4308, 1. 4408). , 316 and 304 on the chemical composition of the main difference is that 316 molybdenum ( Mo） , and generally recognized, 316 has better corrosion resistance, more than 304 under the environment of high temperature corrosion resistance. So under the environment of high temperature, 316 engineers typically select material components. But the so-called no absolute, under the environment of sulfuric acid, high temperature also cannot use 316 again! Because the material 316 will have a chemical reaction and sulfur. Learning mechanical knows that thread, in order to prevent thread below high temperature circumstance bite dead, need to apply a color for the black solid lubricant, the lubricant is called molybdenum disulfide ( 二硫化钼) Molybdenum ( Mo） Really is a kind of high temperature resistant material, such as gold molybdenum crucible is used to fuse. But easily and high molybdenum sulphur ion reaction generated sulfide. So there is no any one is super corrosion resistance of stainless steel. Actually, the stainless steel is a piece of impurities, but these impurities compared to steel is more resistant to corrosion. 304-316 steel content is high, is easy and other physical reaction. So, the selected 304 or 316, basically be to see using the environment corrosion degree.