Which graphite gasket is better? Knowledge point know-how
Presumably many people are no strangers to graphite gaskets, and their functions are also treasured, but there are many types of graphite gaskets, and the applications of different gaskets are different, and the performance is very different. So which material is better? How do I choose it?
The choice of graphite gasket material depends on the following three factors: temperature, pressure, and medium. It is recommended that the maximum operating temperature does not exceed 538 ° C, especially when the medium is oxidizing. High-quality thin carbon steel sheet is not suitable for equipment for manufacturing inorganic acid, neutral or acid salt solution. If carbon steel is subjected to stress, the accident rate of equipment used in hot water conditions is very high. Carbon steel gaskets are often used for high concentrations of acids and many alkaline solutions. Brinell hardness is about 120. The carbon content does not exceed 0.03%. The recommended maximum operating temperature does not exceed 760 ° C. Corrosion resistance is similar to 304 stainless steel. The low carbon content reduces the precipitation of carbon from the crystal lattice, and the resistance to grain boundary corrosion is higher than that of 304 stainless steel. Brinell hardness is about 140. The material does not contain resin or inorganic all-graphite materials. It can be divided into graphite materials with or without metal elements. Graphite gaskets can be bonded so that pipe gaskets with a diameter of more than 600MM can be manufactured. Excellent resistance to many acids, bases, salts and organic compounds and heat transfer solutions, even high temperature solutions. It cannot be melted, but will sublimate when it exceeds 3316 ° C. Under high temperature conditions, the material should be used with caution in highly oxidizing media. In addition to its use in gaskets, this material can also be used to make non-metallic wound tapes in fillers and wound gaskets.