Magnetic flap the level classification of material selection and corrosion performance difference between different media

As a conventional liquid level measuring equipment, magnetic flap liquid level meter used in the production and living is quite common, because of its intuitive, reliable, convenient, cheap and fine, get the favour of broad user, whether it is water soluble liquid, or in the measurement of all kinds of corrosive liquid medium in a large number of applications. Magnetic materials have a variety of liquid level meter, turning in different liquid properties, need to choose different materials, in response to different corrosive medium, normal material such as 304 or 316 stainless steel and 316 l stainless steel, PP, PVC material has to choose, but because of its compression performance and heat resistance of weathering erosion resistance than stainless steel metal material, so the application range is relatively limited. Now commonly used two kinds of stainless steel 304316 ( Or corresponding virtue/the mark 1. 4308, 1. 4408). , the primary difference between 316 and 304 on the chemical composition is 316 containing Mo, and generally accepted, the 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 no * *, the so-called things under the environment of sulfuric acid, high temperature also don't use 316 again. Otherwise it is a big. Learn machinery are studied thread, remember to prevent thread killed below high temperature circumstance, need to apply a black solid lubricant, molybdenum disulfide ( 二硫化钼) , and the 2 conclusions from it not: a: Mo is a kind of high temperature resistant material ( Know what crucible melting gold? Molybdenum crucible! ) 。 2: molybdenum and high sulphur ion reaction easily generate sulfide. So there is no any one is super corrosion resistance of stainless steel. At the end of the day, the stainless steel is a piece of impurities ( However, these impurities are more resistant to corrosion than the steel ^ ^) More steel, is a response to a steel can and other substances. Type more material selection in the production of 316 l, 316 l stainless steel carbon content is 0. 03, after can be used for welding cannot undertake annealing and need big purpose of corrosion resistance. Corrosion resistance is better than 304 stainless steel, the stainless steel is often used in pulp and paper equipment heat exchanger, dyeing equipment, film processing equipment, pipelines, coastal areas with outside the building materials, and advanced a watch bracelet, watch case, etc. Water use equipment, chemical, dyestuff, papermaking, oxalic acid, fertilizer and other production equipment; Photography, food industry, coastal facilities, rope, CD rod, bolts and nuts. 316 l as molybdenum stainless steel, as a result of molybdenum in steel, stainless steel, the steel grade overall performance is better than 310 and 304, under the condition of high temperature when the concentration of sulfuric acid is lower than 15% or higher than 85%, the 316 l stainless steel has a wide range of USES. 316 l stainless steel also has good resistance to chloride erosion performance, so in the use of the Marine environment adaptability is quite good also. For corrosive industrial atmosphere of tolerance is also quite strong, so the application in such an environment. In the actual production process, in addition to the above mentioned is corrosive occasions, we'll also run into other types of corrosive liquid medium, such as sulfuric acid, alkaline liquid and all kinds of organic solvent, if only rely on the corrosion performance of the 304316 L stainless steel itself is difficult to do, for such medium, need through the increase of the auxiliary measuring tube wall lining method to achieve need decay resistance performance. Stainless steel lining anti-corrosion type magnetic level gauge stainless steel lining of ontology turning polypropylene ( PP) And polytetrafluoroethylene ( PTFE） Process, has high structural strength and corrosion resistance, can be applied to acid such as hydrochloric acid liquid, alkali and organic solvents. But is not suitable for concentrated nitric acid, chlorinated solvents, aromatic and aliphatic measurement of liquid medium. Side mounted lining anti-corrosion lining magnetic level gauge with stainless steel body turning polytetrafluoroethylene ( PTFE） And stainless steel inner liner polypropylene ( PP) A measure of the two kinds, suitable for corrosive medium. Side mounted lining type magnetic level gauge (turning PTFE） Suitable for corrosive medium and high working temperature and liquid level measurement, adopt the new technology of stainless steel lining ptfe stretch flanging, structure and reliable, long service life. Is the preferred choice of hydrofluoric acid and the corrosive medium level measurement. Side mounted lining type magnetic level gauge (turning PP) Applicable to hydrochloric acid and dilute sulphuric acid, inorganic kind of corrosive liquid measurement, because of imported high strength is close to metal, especially the PPR unique heat preservation, this product is suitable for outdoor water tank level measurement, internal will not freeze in winter. But not as PTFE lining type heat resistance and compression performance is good, the temperature and pressure is lower to choose the high cost performance products.
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