The choice of gasket material mainly depends on the following three factors: temperature, pressure, and medium
- Carbon steel:
The recommended maximum working temperature should not exceed 538 ℃, especially when the medium is oxidizing. High quality thin carbon steel plates are not suitable for equipment used in the manufacture of inorganic acids, neutral or acidic salt solutions. If carbon steel is subjected to stress, the equipment accident rate under hot water conditions is very high. Carbon steel gaskets are commonly used in high concentration acid and many alkaline solutions. The Brinell hardness is about 120. - 304 stainless steel
18-8 (chromium 18-20%, nickel 8-10%), recommended maximum operating temperature not exceeding 760 ℃. Stress corrosion and grain boundary corrosion are prone to occur within the temperature range of -196~538 ℃. Brinell hardness 160. - 304L stainless steel
The carbon content does not exceed 0. 03%. The recommended maximum working temperature should not exceed 760 ℃. Corrosion resistance is similar to 304 stainless steel. The low carbon content reduces the precipitation of carbon from the lattice, and the resistance to grain boundary corrosion is higher than that of 304 stainless steel. The Brinell hardness is about 140. - 316 stainless steel
18-12 (chromium 18%, nickel 12%), with an increase of about 2% molybdenum in 304 stainless steel, improves its strength and corrosion resistance as the temperature increases. When the temperature increases, it has higher creep resistance than other ordinary stainless steels. The recommended maximum working temperature should not exceed 760 ℃. The Brinell hardness is about 160. - 316L stainless steel
The recommended maximum continuous working temperature should not exceed 760 ℃~815 ℃. Compared to 316 stainless steel, it has better stress resistance and grain boundary corrosion resistance with a carbon content not exceeding. The Brinell hardness is about 140. - 20 alloy
45% iron, 24% nickel, 20% chromium, and small amounts of molybdenum and copper. The recommended maximum working temperature should not exceed 760 ℃~815 ℃. Specially suitable for manufacturing equipment resistant to sulfuric acid corrosion, with a Brinell hardness of approximately 160. - Aluminum
Aluminum (content not less than 99%). Aluminum has excellent corrosion resistance and processability, making it suitable for manufacturing double clip gaskets. The Brinell hardness is about 35. The recommended maximum continuous operating temperature should not exceed 426 ℃. - Purple copper
The composition of purple copper is close to that of pure copper, containing trace amounts of silver to increase its continuous working temperature. The recommended maximum continuous operating temperature should not exceed 260 ℃. The Brinell hardness is about 80. - Brass
(Copper 66%, Zinc 34%), has good corrosion resistance under most working conditions, but is not suitable for acetic acid, ammonia, salt, and acetylene. The recommended maximum continuous operating temperature should not exceed 260 ℃. The Brinell hardness is about 58. - Ha’s B-2
(26-30% molybdenum, 62% nickel, and 4-6% iron). The recommended maximum working temperature should not exceed 1093 ℃. Has excellent resistance to concentrated hydrochloric acid corrosion. It also has excellent resistance to wet hydrogen chloride gas corrosion, sulfuric acid, phosphoric acid, and reducing salt solution corrosion. Has high strength under high temperature conditions. The Brinell hardness is about 230. - Ha Shi C-276
16-18% molybdenum, 13-17.5% chromium, 3.7-5.3% tungsten, 4.5-7% iron, and the rest are all nickel. The recommended maximum working temperature should not exceed 1093 ℃. Has excellent corrosion resistance. It has excellent corrosion resistance to various attempts of cold nitric acid or boiling nitric acid with a concentration of 70%, and has good resistance to hydrochloric acid and sulfuric acid corrosion, as well as excellent stress corrosion resistance. The Brinell hardness is about 210. - Inconel 600
Nickel based alloy (77% nickel, 15% chromium, and 7% iron). The recommended maximum working temperature should not exceed 1093 ℃. It has high strength under high temperature conditions and is usually used for equipment that needs to solve stress corrosion problems. Under low temperature conditions, it has excellent machinability. The Brinell hardness is about 150. - Monel 400
Copper 30%, nickel recommended maximum continuous working temperature not exceeding 815 ℃. Except for strong oxidizing acids, it has excellent corrosion resistance to most acids and bases. Stress corrosion cracking is prone to occur in fluoric acid, mercuric chloride, and mercury media, making it unsuitable for use in the above media. It is widely used in equipment for manufacturing hydrofluoric acid. The Brinell hardness is about 120. - Titanium
The recommended maximum working temperature should not exceed 1093 ℃. Under high temperature conditions, it has excellent corrosion resistance. As is well known, it is resistant to chloride ion corrosion and has excellent resistance to nitric acid corrosion over a wide temperature and concentration range. Titanium materials are rarely used in most alkaline solutions and are suitable for oxidation conditions. The Brinell hardness is approximately 216.