What is special steel? What are the application areas of special steel?

310SS31008 310S is austenitic chromium-nickel stainless steel with good oxidation resistance and corrosion resistance. Because of the higher percentage of chromium and nickel, 310S has much better creep strength, can continue to work at high temperatures, and has good resistance High temperature. The main purpose is suitable for making various furnace components, the highest temperature is 1300℃, and the continuous use temperature is 1150℃. Such as furnace materials, automotive purification equipment materials, etc. 800N8800 nickel-iron-chromium alloy is resistant to high temperature oxidation, high temperature peeling and high temperature carbonization. The nickel content of the alloy is 32%, which is sufficient to resist chloride stress corrosion and alloy embrittlement caused by 6 precipitation phases. At the same time, the alloy has excellent resistance to uniform corrosion ability. The operating temperature of AL-800 alloy is 590. Around C; the operating temperature of AL-800H and AL-800A alloys can reach 590. Above C, it also has good creep resistance and stress fracture resistance at high temperatures. Main uses: heating furnaces and related heating equipment, such as deep processing equipment and decomposition pipes for petrochemical products; superheated steam treatment pipes and parts for nuclear industry and power plants; petroleum, chemical, food, pulp, and paper industries. 600N06600 is a nickel-chromium nickel-based alloy, non-magnetic. Mainly used for resistance to high temperature and atmospheric corrosion, it can be used up to 1093°C in the atmosphere. Because the alloy is a nickel-based alloy, it is resistant to stress corrosion and is widely used in the cooling system of nuclear reactors. Main uses: Nuclear reactor cooling system, heating furnace, carburizing basket and fasteners, heat treatment fixture. 2304S323042304 alloy is a duplex stainless steel composed of 23% chromium and 4% nickel. The corrosion resistance of 2304 alloy is similar to that of 316L. In addition, its mechanical properties, namely the yield strength, are twice that of 304L/316L austenitic grades. This feature enables designers to reduce the weight of products when designing products, especially when designing pressure vessels. This alloy is especially suitable for the temperature range of -50°C/+300°C (-58. F/572. F). Under strict restrictions (especially for welded structures), it can also be used at lower temperatures. Compared with 304 and 316 austenite, due to the dual phase microstructure of 2304 alloy itself, the lower nickel content and higher chromium content make it more resistant to stress corrosion. Main uses: Pulp and paper industry (chips, chip storage tanks, black or white liquid tanks, Classifier); caustic alkali solution, organic acid (anti-SCC); food industry; pressure vessel (weight reduction); mining industry (abrasion/corrosion) 2205S31803/S32205 Nitrogen optimized dual phase (austenite and ferrite) )Stainless steel. The addition of nitrogen increases the alloy’s resistance to uniform corrosion and chloride stress corrosion. In many corrosive environments, the corrosion resistance of the alloy is better than that of 316 or 317 alloy, and the yield strength is higher than that of traditional stainless steel. Main application Because the alloy has better resistance to hydride stress corrosion, pitting corrosion and crevice corrosion than ordinary 18-8 stainless steel, it is widely used in heat exchangers for industrial sewage, hydride-containing, and hydrogen sulfide industrial water. , In the condenser. 2507S327502507 is a ferritic-austenitic (duplex) stainless steel, which combines the most beneficial properties of many ferritic steels and austenitic steels. Because the steel contains high chromium and molybdenum, it has extremely high chromium and molybdenum content. Good resistance to pitting corrosion, crevice corrosion and uniform corrosion. The two-way microstructure ensures that the steel has a high resistance to stress corrosion cracking, and the mechanical strength is also very important. 2507 stainless steel is used in the oil and gas industry; heat exchanger tubes; water treatment and water supply systems; fire fighting systems; spray Water system, water stabilization system; petrochemical equipment; desalination (desalination) equipment (and high-pressure pipes and seawater pipes in the equipment); mechanical and structural components that require both high strength and high corrosion resistance; combustion (waste) gas purifyer. 904LN08904 austenitic stainless steel has good resistance to chloride stress corrosion. The ability to resist uniform corrosion and chloride pitting in many media is higher than that of 316 and 317 alloys. At the same time, it can resist the corrosion of reducing media, such as hot phosphoric acid and Dilute sulfuric acid. The carbon content of the alloy is very low, which is conducive to the welding of pressure vessels and the processing and manufacturing of complex parts. Main purposes: Flue gas purification device; fertilizer production; acid industry; power generation equipment and gas corrosive environment. 254SMO 254SMO is an austenitic stainless steel. Due to its high molybdenum content, it has extremely high resistance to pitting corrosion and crevice corrosion. This grade of stainless steel is developed and developed for use in environments containing halide such as sea water. 254SMO also has good uniform corrosion resistance. Especially in acids containing halide, the steel is superior to ordinary stainless steel. Its C contains <0. 03%, so it is called pure austenitic stainless steel. Super stainless steel and nickel-based alloy are a kind of special stainless steel. Firstly, they are different from ordinary stainless steel in chemical composition. They refer to a kind of high-alloy stainless steel with high nickel, high chromium and high molybdenum. Among them is 254SMo with 6% Mo. This type of steel has very good local corrosion resistance. It has good pitting corrosion resistance (PI≥40) and It has good stress corrosion resistance and is a substitute material for Ni-based alloys and titanium alloys. Secondly, in terms of high temperature resistance or corrosion resistance, it has better high temperature resistance or corrosion resistance, and it is irreplaceable for 304 stainless steel. In addition, from the classification of stainless steel, the metallographic structure of special stainless steel is a stable austenitic metallographic structure. Main uses 1. Ocean: Marine structures in the marine environment, seawater desalination, mariculture, seawater heat exchange, etc. 2. Environmental protection field: flue gas desulfurization device for thermal power generation, waste water treatment, etc. 3. Energy field: nuclear power generation, comprehensive utilization of coal, sea tide power generation, etc. 4. Petrochemical industry: oil refining, chemical and chemical equipment, etc. 5. Food field: salt making, soy sauce brewing, etc. 6. High-concentration chloride ion environment: paper industry, various bleaching devices 825N08825 austenitic nickel-iron-chromium-molybdenum-copper alloy. Containing high content of nickel, chromium, molybdenum and copper elements, the alloy has better corrosion resistance in moderately oxidizing and moderately reducing environments. The alloy has good resistance to oxide stress corrosion and a certain level of resistance to chloride ion pitting. The alloy is a composite of Mo and Cu, so it has excellent resistance to sulfuric acid corrosion; at the same time, due to the addition of a certain amount of titanium, the stability of the alloy is increased, and the welded joint has better resistance to intergranular corrosion. Main uses Because the alloy has a wide range of corrosion resistance, it has been widely used in the chemical industry, paper industry, and wet-process phosphoric acid production. It is mainly used to treat hot sulfuric acid, chloride-containing acid solutions and sulfurous acid and other environmental containers, heat Exchangers, pipes, valves, pumps, etc. C276N10276 belongs to nickel-molybdenum-chromium-iron-tungsten nickel-based alloy. Mainly resistant to wet chlorine, various chlorines, various oxidizing chlorides, chloride salt solutions, sulfuric acid and oxidizing salts. It has good corrosion resistance in low temperature and medium temperature hydrochloric acid. Since the alloy has good corrosion resistance from moderate oxidation to strong reduction environments, it has been widely used in harsh corrosive environments in the past 30 years. Main applications Chemical industry, petroleum, flue gas desulfurization, pulp and paper and other special fields. The most severe corrosive environment contains a certain amount of oxygen, nitrogen, carbon, silicon, iron and other elemental impurities of α-phase titanium. It has excellent stamping process performance, good welding performance, insensitive to heat treatment and structure type, and has a certain strength under satisfactory plastic conditions. Industrial pure titanium is graded according to the content of impurity elements. Its strength mainly depends on the content of interstitial elements oxygen and nitrogen. It has high corrosion resistance in seawater, but is poor in inorganic acids. It is generally used to manufacture various sheet parts or forgings that work at a temperature of -253~350℃ with little force. It can also be used to manufacture rivet wires and pipes. Main uses Titanium and titanium alloys are widely used in the aviation industry and are known as “space metals”; in addition, they are increasingly widely used in the shipbuilding industry, chemical industry, manufacturing mechanical parts, telecommunications equipment, and cemented carbide. It belongs to nickel-molybdenum-chromium-iron-tungsten nickel-based alloy. Mainly resistant to wet chlorine, various chlorines, various oxidizing chlorides, chloride salt solutions, sulfuric acid and oxidizing salts. It has good corrosion resistance in low temperature and medium temperature hydrochloric acid. Since the alloy has good corrosion resistance from moderate oxidation to strong reduction environments, it has been widely used in harsh corrosive environments in the past 30 years. Main uses: Chemical industry, petroleum, flue gas desulfurization, pulp and paper and other special fields. The harshest corrosive environment contains a certain amount of oxygen, nitrogen, carbon, silicon, iron and other elemental impurities of α-phase titanium. It has excellent stamping process performance, good welding performance, insensitive to heat treatment and structure type, and has a certain strength under satisfactory plastic conditions. Industrial pure titanium is graded according to the content of impurity elements. Its strength mainly depends on the content of interstitial elements oxygen and nitrogen. It has high corrosion resistance in seawater, but is poor in inorganic acids. It is generally used to manufacture various sheet parts or forgings that work at a temperature of -253~350℃ with little force. It can also be used to manufacture rivet wires and pipes. Main uses Titanium and titanium alloys are widely used in the aviation industry and are known as “space metals”; in addition, they are increasingly widely used in the shipbuilding industry, chemical industry, manufacturing mechanical parts, telecommunications equipment, and cemented carbide. It belongs to nickel-molybdenum-chromium-iron-tungsten nickel-based alloy. Mainly resistant to wet chlorine, various chlorines, various oxidizing chlorides, chloride salt solutions, sulfuric acid and oxidizing salts. It has good corrosion resistance in low temperature and medium temperature hydrochloric acid. Since the alloy has good corrosion resistance from moderate oxidation to strong reduction environments, it has been widely used in harsh corrosive environments in the past 30 years. Main applications Chemical industry, petroleum, flue gas desulfurization, pulp and paper and other special fields. The most severe corrosive environment contains a certain amount of oxygen, nitrogen, carbon, silicon, iron and other elemental impurities of α-phase titanium. It has excellent stamping process performance, good welding performance, insensitive to heat treatment and structure type, and has a certain strength under satisfactory plastic conditions. Industrial pure titanium is graded according to the content of impurity elements. Its strength mainly depends on the content of interstitial elements oxygen and nitrogen. It has high corrosion resistance in seawater, but is poor in inorganic acids. It is generally used to manufacture various sheet parts or forgings that work at a temperature of -253~350℃ with little force. It can also be used to manufacture rivet wires and pipes. Main uses Titanium and titanium alloys are widely used in the aviation industry and are known as “space metals”; in addition, they are increasingly widely used in the shipbuilding industry, chemical industry, manufacturing mechanical parts, telecommunications equipment, and cemented carbide.

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