Plate heat exchanger commonly used plate material_
760 At present, the commonly used plate materials of brand plate heat exchangers mainly include: 304 stainless steel, 304L stainless steel, 316 stainless steel, 316L stainless steel, 254 SMO stainless steel and duplex stainless steel 2205 alloy, these different types Each plate material has its own advantages and characteristics, let's take a look at it in detail below! ① Type 304 stainless steel This is a cheap and widely used austenitic stainless steel (such as food, chemical, atomic energy and other industrial equipment). Suitable for general organic and inorganic media. For example, nitric acid with concentration <30%, temperature ≤100°C or concentration ≥30%, temperature <50°C; carbonic acid, ammonia and alcohols with various concentrations of temperature ≤100°C. Poor corrosion resistance in sulfuric acid and hydrochloric acid; especially sensitive to crevice corrosion caused by chlorine-containing media (such as cooling water). ② The corrosion resistance and use of 304L stainless steel are basically the same as those of 304 stainless steel. Due to the lower carbon content (≤0.03%), the corrosion resistance (especially resistance to intergranular corrosion, including the weld zone) and weldability are better, and it can be used for semi-welded or fully-welded PHE. ③Type 316 stainless steel is suitable for general organic and inorganic media. For example, natural cooling water, cooling tower water, softened water; carbonic acid; acetic acid and caustic lye with a concentration of <50%; solvents such as alcohols and acetone; dilute nitric acid (concentration <20%u003d, dilute phosphoric acid ( Concentration <30% u003d etc. However, it is not suitable for sulfuric acid. Because it contains about 2% Mo, it has better corrosion resistance in sea water and other chlorine-containing media than 304 type, and can completely replace 304 type. ④ 316L stainless steel Corrosion resistance and use are basically the same as Type 316. Because the carbon content is lower (≤0.03%), the weldability and corrosion resistance after welding are also better, and it can be used for semi-welded or fully-welded PHE. PRE It is 25. 254 SMO stainless steel This is an ultra-low carbon stainless steel that has been improved on type 316 by increasing the content of Mo. It has excellent resistance to chloride pitting and crevice corrosion, and is suitable for salt water, type 316 that cannot be used. Inorganic acid and other media. 254SMO is a kind of austenitic stainless steel. Because of its high molybdenum content, it has extremely high resistance to pitting corrosion and crevice corrosion. 254SMO also has good resistance to uniform corrosion. Especially when it contains In the acid of halide, the steel is better than ordinary stainless steel. Its C content is <0.03%, so it is called pure austenitic stainless steel (<0.01% is also called super austenitic stainless steel). ⑥Duplex stainless steel 2205 alloy duplex stainless steel 2205 alloy is a duplex stainless steel composed of 21% chromium, 2.5% molybdenum and 4.5% nickel-nitrogen alloy. It has high strength, good impact toughness and good overall and local stress corrosion resistance. Yield strength of 2205 duplex stainless steel It is twice that of austenitic stainless steel. This alloy is particularly suitable for the temperature range of -50°F/+600°F. For applications beyond this temperature range, this alloy can also be considered, but there are some limitations, especially When applied to welded structures. Compared with 316L and 317L austenitic stainless steel, duplex stainless steel 2205 alloy has superior performance in pitting corrosion and crevice corrosion. It has high corrosion resistance. Compared with the body, its thermal expansion coefficient is lower and the thermal conductivity is higher. Compared with the austenitic stainless steel, the duplex stainless steel 2205 alloy has twice the compressive strength. Compared with 316L and 317L, the designer can reduce Its weight. The above is an introduction to the plate materials of several common brands of plate heat exchangers. I hope it can help you make better choices. For more information on the brand of plate heat exchangers, please follow the official website of Diguang!