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The installation of gasket and the choice of material

Hits:Updated:2017-06-13 08:06:37【Print】

The material used to select the gasket depends mainly on the following three factors: temperature, pressure, medium. The following are the same as the "
Metal gasket material
1.304L stainless steel
Carbon content of not more than 0.03%. Recommended maximum operating temperature does not exceed 760 ℃. Corrosion resistance similar to 304 stainless steel. Low carbon content reduces the precipitation of carbon from the lattice, and its resistance to grain boundary corrosion is higher than that of 304 stainless steel. Brinell hardness of about 140. The following are the same as the "
2. 304 stainless steel
18-8 (chromium 18-20%, nickel 8-10%), the recommended maximum operating temperature does not exceed 760 ℃. In the temperature range of -196 ~ 538 ℃, prone to stress corrosion and grain boundary corrosion. Brinell hardness 160. The following are the same as the "
3. Carbon steel:
It is recommended that the maximum operating temperature does not exceed 538 ° C, especially when the medium is oxidizable. High-quality thin carbon steel plate is not suitable for use in the manufacture of inorganic acid, neutral or acidic salt solution equipment, if the carbon steel under the stress, under the conditions of hot water equipment accident rate is very high. Carbon steel gaskets are commonly used for high concentrations of acids and many alkaline solutions. Brinell hardness of about 120. 4.316 stainless steel
Recommended maximum continuous working temperature does not exceed 760 ℃ ~ 815 ℃. The carbon content does not exceed that of 316 stainless steel with better resistance to stress and grain boundary corrosion. Brinell hardness of about 140. The following are the same as the "
5.20 alloy
45% iron, 24% nickel, 20% chromium and a small amount of molybdenum and copper. Recommended maximum operating temperature does not exceed 760 ℃ ~ 815 ℃. Particularly suitable for the manufacture of sulfuric acid corrosion resistant equipment, Brinell hardness of about 160. The following are the same as the "
6.316L stainless steel
18-12 (chromium 18%, nickel 12%), increased by about 2% molybdenum in 304 stainless steel, when the temperature increases its strength and corrosion resistance improved. When the temperature increases, it has higher creep resistance than other ordinary stainless steels. Recommended maximum operating temperature does not exceed 760 ℃. Brinell hardness of about 160. The following are the same as the "
7. Aluminum
Aluminum (content of not less than 99%). Aluminum has excellent corrosion resistance and processability, suitable for the manufacture of double clamp gasket. Brinell hardness of about 35. Recommended maximum continuous operating temperature does not exceed 426 ℃. The following are the same as the "
8. Copper
The composition of copper is close to pure copper, which contains trace amounts of silver to increase its continuous operating temperature. Recommended maximum continuous working temperature does not exceed 260 ℃. Brinell hardness of about 80. The following are the same as the "
9. brass
(Copper 66%, zinc 34%), in most working conditions, with good corrosion resistance, but not suitable for acetic acid, ammonia, salt and acetylene. Recommended maximum continuous working temperature does not exceed 260 ℃. Brinell hardness of about 58. The following are the same as the "
10. Hastelloy B-2
(26-30% molybdenum, 62% nickel and 4-6% iron). Recommended maximum operating temperature does not exceed 1093 ℃. Has excellent heat resistance to hydrochloric acid corrosion. Also has excellent resistance to wet hydrogen chloride gas corrosion, sulfuric acid, phosphoric acid and reducing salt solution corrosion performance. In high temperature conditions with high strength. Brinell hardness of about 230. The following are the same as the "
11. Hastelloy C-276
16-18% molybdenum, 13-17.5% chromium, 3.7-5.3% tungsten, 4.5-7% iron, and the rest are nickel). Recommended maximum operating temperature does not exceed 1093 ℃. Has excellent corrosion resistance. It has excellent corrosion resistance to boiling nitric acid or 70% boiling nitric acid, and has good resistance to hydrochloric acid and sulfuric acid corrosion and excellent stress corrosion resistance. Brinell hardness of about 210. The following are the same as the "
12. Inco Nile 600
Nickel-based alloys (77% nickel, 15% chromium and 7% iron). Recommended maximum operating temperature does not exceed 1093 ℃. In high temperature conditions with high strength, usually used to solve the problem of stress corrosion equipment. In the low temperature conditions, with excellent processing performance. Brinell hardness of about 150. The following are the same as the "
13. Monel 400
(Copper 30%, nickel recommended maximum continuous working temperature does not exceed 815 ℃. In addition to strong oxidizing acid, the majority of acid and alkali with excellent corrosion resistance in the fluorine acid, mercuric chloride, mercury medium prone to stress corrosion Cracks, and therefore, are not suitable for use in the above medium. Widely used in the manufacture of hydrofluoric acid equipment. Brinell hardness of about 120.
14. Titanium
Recommended maximum operating temperature does not exceed 1093 ℃. In high temperature conditions, with excellent corrosion resistance. It is known that the resistance to chloride ions, in a wide range of temperature and concentration, with excellent resistance to nitric acid corrosion. Titanium is used in most alkaline solutions and is suitable for use in oxidative conditions. Brinell hardness of about 216. The following are the same as the "
Second, non-metallic gasket material
Natural rubber
It has good corrosion resistance to weak acid and alkali, salt and chloride solution, and is poor in corrosion resistance to oil and solvent and is not recommended for ozone media. Recommended operating temperature -57 ℃ ~ 93 ℃. The following are the same as the "
2. neoprene CR
Neoprene is a synthetic rubber that is resistant to corrosion of medium-corrosive acids, bases and salt solutions. It has good corrosion resistance to commercial oil and fuel. But the corrosion resistance of strong oxidizing acids, aromatic hydrocarbons and chlorinated hydrocarbons is poor. Recommended operating temperature -51 ℃ ~ 121 ℃. The following are the same as the "
3. Butyl cyanide NBR
Dicyanyl rubber is a synthetic rubber that is suitable for corrosive properties of oil, solvents, aromatics, basic hydrocarbons, oil and natural gas over a wide temperature range. It has good corrosion resistance to hydroxides, salts and near neutral acids. However, in strong oxidizing media, chlorinated hydrocarbons, ketones and lipids, the corrosion resistance is poor, the recommended working temperature of 51 ℃ ~ 121 ℃. The following are the same as the "
4. Fluorine rubber
It has good corrosion resistance to oil, fuel, chloride solution, aromatic hydrocarbon and lipid hydrocarbon and strong acid, but is not suitable for use in amines, lipids, ketones and steam. Recommended working temperature -40 ℃ ~ 232 ℃ The The following are the same as the "
5. Chlorosulfonated polyethylene Synthetic rubber has good corrosion resistance to acid, alkali and salt solutions, and is not affected by climate, light, ozone, commercial fuels such as diesel and kerosene. But not suitable for aromatic hydrocarbons, chlorinated hydrocarbons, chromic acid and nitric acid. Recommended working temperature -45 ℃ ~ 135 ℃. The following are the same as the "
6. silicone rubber
Good heat resistance to hot air. Silicone rubber is not affected by sunlight and ozone. But not suitable for use in steam, ketones, aromatic hydrocarbons and aliphatic hydrocarbons. The following are the same as the "
7. Ethylene-propylene rubber
Strong acid, alkali, salt and chloride solution has good corrosion resistance. But not suitable for use in oils, solvents, aromatic hydrocarbons and hydrocarbons. Recommended operating temperature -57 ℃ ~ 176. The following are the same as the "
8. Graphite
The material does not contain resin or inorganic material of the whole graphite material can be divided into metal or non-incorporation of metal elements graphite material. The material can be bonded so that it can be made with a diameter of more than 600mm pipe gasket. For many acids, alkalis, salts and organic compounds and heat transfer solution, and even high temperature solution has a very good corrosion resistance. It can not melt, but over 3316 ℃ will sublimate. In high temperature conditions, the use of the material in strong oxidizing media should be careful. In addition to the gasket, the material can also be used to make non-metallic strips in the packing and winding gasket. The following are the same as the "
9. Ceramic fiber, made in the strip of ceramic fiber is suitable for high temperature and low pressure conditions and light flange conditions under the excellent gasket material, the recommended working temperature of 1093 ℃, can be made in the spiral wound gasket wound band. The following are the same as the "
10. Polytetrafluoroethylene has focused on the advantages of most plastic gaskets, including temperature from -95 ° C to 232 ° C. In addition to free fluorine and alkali metals, chemical, solvents, hydroxides and acids have excellent corrosion resistance. PTFE material can be filled with glass, the purpose is to reduce the cold flow of PTFE and creep.

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