Hastelloy 2.4 It is one of the most corrosion resistant modern metal materials. The main wet chlorine, all kinds of oxidative chloride, chloride solution, sulfuric acid and oxidative salts, both in low temperature and hydrochloric acid have good corrosion resistance. Therefore, it has been widely used in harsh corrosive environments such as chemical industry, petrochemical industry, flue gas desulfurization, pulp and paper, environmental protection and other industrial fields for nearly three decades. "Hastelloy" alloy valves are mainly used for pipes and fittings for transporting corrosive media such as ammonium chloride, zinc chloride, aluminum sulfate, ammonium sulfate, hydrochloric acid etc. 3. Other metals 3.1 Surface of aluminum Aluminum Dense oxide protective film, less susceptible to corrosion, and the density of small, beautiful, relatively soft, but can be made of various aluminum alloys, such as duralumin, super-hard aluminum, rust-proof aluminum, cast aluminum and so on. 3.2 bronze valve body and bonnet, with excellent impact strength, minimum heat loss and corrosion resistance. 3.3 aluminum bronze (aluminum bronze c-415) This alloy has high strength corrosion resistance, hardness and mild steel close, and has a hard to darken the metallic luster, with high strength, good friction and good Corrosion resistance, hot working, solderable, but difficult to braze. 3.4 super bidirectional stainless steel bidirectional stainless steel has strong resistance to chloride corrosion, high thermal conductivity and lower thermal expansion coefficient. Higher chromium, molybdenum and nitrogen content It has high resistance to pitting, crevice corrosion and general corrosion. Its impact strength is also high, 2507 alloy is not suitable for use in higher than 570 ℃ temperature environment, long-term in this environment, its toughness will be reduced. Super duplex stainless steel is more corrosion resistant than duplex stainless steel and has superior mechanical properties. Often used in offshore oil platforms (heat exchanger tubes, water treatment and water supply systems, fire protection systems, water spray systems, water stabilization systems), desalination (desalination) equipment and other special chemical equipment.