Plate heat exchanger used plate material

Plate heat exchanger used plate material

First, type 304 stainless steel
This is the cheapest and the most widely used of austenitic stainless steel (e.g., food, chemical industry, industrial equipment, such as atomic energy).Applicable to the general organic and inorganic medium.Concentration < 30%, the temperature of 100 ℃ or less, for example, or a concentration of 30% or more, temperature < 50 ℃ of nitric acid;Temperature of 100 ℃ or less concentration of carbonic acid, ammonia and alcohol.Poor corrosion resistance in sulfuric acid and hydrochloric acid;Especially for chlorine medium (such as cooling water) caused by the crevice corrosion is the most sensitive.Chlorine aqueous solution in the applicable condition, the PRE is 19.
Second, the type 304 l stainless steel
The corrosion resistance and USES the same as the type 304 basic.Because the carbon content is low (0.03%) or less, so the corrosion resistance (especially resistant to intergranular corrosion, including weld area) and better weldability, can be used in half and welded or all-welded PHE.

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Three, type 316 stainless steel
Applicable to the general organic and inorganic medium.For example, natural cooling water, cooling tower water, soften water;Carbonate;Concentration < 50% of acetic acid and caustic liquid;Alcohol and acetone solvent;Temperature of 100 ℃ or less dilute nitric acid concentration (< = 20%, dilute phosphoric acid concentration (< = 30%, etc., however, should not be used in sulphuric acid. Because of containing about 2% Mo, in seawater and other chlorine medium corrosion resistance is better than 304, can completely replace the type 304, see table 1-34. PRE is 25.
Fourth, 316 l stainless steel
The corrosion resistance and USES the same as the type 316 basic.Due to lower carbon content (0.03%) or less, so the weldability and corrosion resistance are also better after welding, can be used in half and welded or all-welded PHE.The PRE is 25.
Five, the type 317 stainless steel
Suitable for requirements than the working condition of type 316 a longer service life.As Cr, Mo, Ni elements of the content is a little higher than 316 type, therefore, crevice corrosion, pitting corrosion and stress corrosion resistant performance is better.The PRE is 30.
Six, AISI 904 l or SUS 890 l stainless steel
This is a kind of give attention to both the price and the corrosion resistance of austenitic stainless steel, high ratio of performance to its corrosion resistance is better than the above several kinds of materials, especially suitable for general sulfuric acid, phosphoric acid and other acids and halide (containing Cl -, F -).Due to the higher levels of Cr, Ni, Mo, it has good resistance to stress corrosion, pitting and crevice corrosion performance.In the suitable conditions to use chlorine medium, the PRE is 36.
Seven, 254 SMO Avesta advanced stainless steel
This is a kind of by raising the Mo content on the type 316 senior ultra-low carbon stainless steel is improved, it has excellent resistance to chloride pitting and crevice corrosion resistance, applicable to cannot use the type 316 salt water, inorganic acid medium, etc.In the suitable conditions to use chlorine medium, the PRE for 47.
Eight, Hastelloy C – 276
This is an expensive ultra-low carbon Ni (57%) – Cr (16%) – Mo alloy C (16%) were the main varieties in the nickel base alloy.Hastelloy is the at Cabot Co. registered trademark of the company.Abroad, started production in the 1960 s, has more than 55000 tons of used in all kinds of industrial, has good corrosion resistance: in low PH medium is hardly affected by Cl -;For a variety of the concentration of sulfuric acid corrosion resistance is wonderful, is one of the few material that can be used in hot concentrated sulfuric acid.Is widely used in organic acids such as formic acid, acetic acid, high temperature HF acid and a certain concentration of hydrochloric acid (< = 40%, phosphoric acid (50%) or less, chloride, fluoride and organic solvent (such as methanol, ethanol). PRE for 69.

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