The plate heat exchanger plate is specially used for the plate heat exchanger to isolate the medium and exchange heat, and is an important part of the plate heat exchanger. heat exchanger plate materials are stainless steel (SUS304.316), titanium and titanium palladium (Ti, Ti-Pd), 20Cr, 18Ni, 6Mo (254SMO), alloy (C276), copper (H68)
(1)304 stainless steel
This is the cheapest and most 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 having a concentration of <30%, temperature ≤ 100℃ or concentration ≥ 30%, temperature < 50 ℃; various concentrations of carbonic acid, ammonia water and alcohols having a temperature ≤ 100℃. Poor corrosion resistance in sulfuric acid and hydrochloric acid; especially sensitive to crevice corrosion caused by chlorine-containing media such as cooling water.
(2)04L stainless steel
Corrosion resistance and use are basically the same as those of Model 304. Due to its lower carbon content (≤0.03%), corrosion resistance (especially resistance to intergranular corrosion, including weld areas) and weldability are better, and it can be used for semi-welded or all-welded PHE.
(3)316 stainless steel
Suitable for general organic and inorganic media. For example, natural cooling water, cooling tower water, demineralized water; carbonic acid; acetic acid and caustic solution with concentration <50%; solvent such as alcohol and acetone; Dilute nitric acid with temperature ≤100 °C (concentration <20%dilute phosphoric acid (concentration <30%). However, it is not suitable for sulfuric acid. Because it contains about 2% Mo, it is resistant in seawater and other chlorine-containing media. Corrosion is better than Type 304 and can completely replace Type 304.
(4)316L stainless steel
Corrosion resistance and use are basically the same as those of Type 316. Due to the lower carbon content (≤0.03%), solderability and post-weld corrosion resistance are also better, and can be used for semi-welded or all-welded PHE. PRE is 25.
(5) 254 SMO Premium Stainless Steel
This is an ultra-low carbon high-grade stainless steel with improved Mo content of AISI 316 type. It has excellent resistance to chloride pitting and crevice corrosion, and is suitable for mediums containing salt water and inorganic acids o. 254SMO is an austenitic stainless steel. Due to its high molybdenum content, it has extremely high pitting and crevice corrosion resistance. 254SMO also has good resistance to uniform corrosion. Especially in halide-containing acids, the steel is superior to ordinary stainless steel. Its C contains <0.03%, so it is called pure austenitic stainless steel (<0.01% is also called super austenitic stainless steel).