High-temperature alloys are divided into three types of materials: 760 ℃ high temperature materials, 1200 ℃ high temperature materials and 1500 ℃ high temperature materials, with a tensile strength of 800MPa. In other words, it refers to high-temperature metal materials that work for a long time at 760–1500 °C and under certain stress conditions. It has excellent high-temperature strength, good oxidation resistance and thermal corrosion resistance, good fatigue performance, fracture toughness and other comprehensive properties. It has become an irreplaceable key material for the hot end components of military and civilian gas turbine engines. Classification 760℃ high temperature material deformation superalloy Deformed superalloy refers to a class of alloys that can be processed by hot and cold deformation, with a working temperature range of -253 to 1320 °C, good mechanical properties, comprehensive strength and toughness indicators, and high oxidation resistance and corrosion resistance. According to its heat treatment process, it can be divided into solid solution strengthened alloy and aging strengthened alloy. The first digit after GH indicates the classification number, namely 1, solid solution strengthened iron-based alloy 2, age-hardened iron-based alloy 3, solid solution strengthened nickel-based alloy 4, cobalt-based alloy after GH, the second, third, and fourth digits Numbers...
Alloy 2304 (UNS S32304) is a molybdenum-free duplex stainless steel composed of 23% chromium, 4% nickel. 2304 stainless steel (Chinese grade: 00Cr23Ni4N) is a low-alloy duplex stainless steel developed in Sweden. Its solution treatment temperature is about 1000 ℃, and its structure is 40%-50% ferrite and 50%-60% austenite. , has the common characteristics of duplex stainless steel, and is developed as a steel with high strength and low price, which can replace the commonly used austenitic stainless steels of 304L and 316L. It has been approved by the American Society of Mechanical Engineers (ASME) for use in piping for boilers and pressure vessels, chemical plants and refineries, and has been incorporated into standards in many countries. The American standard is UNS S32304, and the Swedish commercial grade is SAF 2304. The corrosion resistance properties of alloy 2304 are similar to those of 316L. In addition, its mechanical properties, namely yield strength, are twice that of the 304L/316L austenitic grades. This feature enables designers to reduce product weight when designing products, especially pressure vessels. SAF 2304 stainless steel has good mechanical and physical properties, resistance to stress corrosion and other forms of corrosion, and good weldability, making it possible to replace...
Stainless steel is favored by the huge desalination industry in the Middle East due to its corrosion resistance and super thermal conductivity. In an exceptionally dry Middle East, where fresh water is scarce, yet the population is growing, drinking water remains a very precious commodity. For decades, the region has relied on desalination processes to provide its inhabitants with valuable fresh water. The desalination industry is a global industry. Currently, there are more than 17,000 commercial desalination plants in the world, providing usable water to 174 countries. Desalination plants remove salt and minerals from seawater, making it more suitable for human consumption and for agricultural irrigation. The desalination capacity in the Middle East accounts for more than 60% of the global capacity. Saudi Arabia is the largest producer of desalinated seawater in the region. Because of its corrosion resistance, stainless steel is the equipment material of choice for desalination plants and reverse osmosis plants. seawater desalination process Modern desalination plants typically use two processes – distillation or reverse osmosis, and steel is the core material for both. After being treated by one of these processes, piped seawater is divided into treated water and concentrated brine, which has a higher salinity...
The surface quality of 304 stainless steel plate is mainly determined by the pickling process after heat treatment. If the surface oxide scale formed by the previous heat treatment process is thick or the structure is uneven, pickling cannot improve the surface finish and uniformity. Therefore, full attention should be paid to the heating of heat treatment or the surface cleaning before heat treatment. If the thickness of the oxide scale on the surface of the stainless steel plate is not uniform, the surface finish of the base metal under the thick part and the thin part will also be different. Therefore, the surface of the steel plate is not uniform. Therefore, it is necessary to uniformly form oxide scales during heat treatment. To meet this requirement, the following issues must be noted: If the stainless steel plate adheres to oil on the surface of the workpiece during heating, the thickness and composition of the oxide scale at the oil-attached part will be different from the thickness and composition of the oxide scale in other parts, and carburization will occur. The carburized part of the base metal under the oxide scale will be severely attacked by the acid. The oil...
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