Details of the performance, production, and application of Q345D low-temperature steel pipe

Details of the performance, production, and application of Q345D low-temperature steel pipe With the continuous development of the fertilizer production industry, the requirements for equipment are becoming increasingly stringent. Among them, seamless steel pipes, as one of the core materials of high-pressure fertilizer equipment, are particularly important. Among the many seamless steel pipes, Q345D seamless steel pipes for high-pressure fertilizer equipment have won wide recognition in the market with their unique performance advantages. Details of Q345D cryogenic steel pipe 1. Implementation standard of Q345D cryogenic steel pipe: GB/T6479 seamless steel pipe for high-pressure fertilizer equipment, which shall comply with the requirements of TSG D7002 pressure pipeline component type test rules 2. Chemical composition of Q345D cryogenic steel pipe: carbon: 0.12~0.18, silicon 0.20~0.50, manganese: 1.2~1.7, chromium: ≤0.30, vanadium: ≤0.15, niobium: ≤0.07, nickel: ≤0.50, phosphorus: not more than 0.025, sulfur not more than 0.015. 3. Mechanical properties of Q345D low temperature steel pipe: tensile strength 490~670MPa, yield strength: wall thickness less than or equal to 16mm not less than 345MPa, wall thickness 16mm~40mm not less than 335MPa, wall thickness greater than 40mm not less than 352MPa, elongation after fracture: longitudinal not less than 21, transverse not less than 19, low temperature punching -20℃: longitudinal not less than 40, transverse not less than 27 4. Heat treatment system of Q345D low temperature steel pipe: 880℃~940℃ normalizing 5. Production process of Q345D low temperature steel pipe: cold drawing, hot rolling, hot expansion. 6. Delivery status of Q345D low temperature steel pipe: hot rolling, heat treatment. 7.Q345D low-temperature steel pipe has an outer diameter of 21.3mm~762mm and a wall thickness of 3mm~140mm Q345D seamless steel pipe is made of high-quality low-alloy high-strength structural steel, and its yield strength is about 345MPa. This excellent mechanical property enables the steel pipe to withstand the huge pressure and heavy load generated by high-pressure fertilizer equipment during operation. Under high-pressure and high-load conditions, Q345D seamless steel pipe can still remain stable, thereby ensuring the stable operation of fertilizer production equipment and greatly improving production efficiency. In addition, Q345D seamless steel pipe also has good corrosion resistance. In the process of fertilizer production, acidic gases and corrosive substances are often produced, and the erosion of these substances on equipment cannot be underestimated. However, Q345D seamless steel pipe has undergone strict anti-corrosion treatment, which can effectively resist the erosion of these corrosive substances and ensure the service life of the equipment. In addition to excellent mechanical properties and corrosion resistance, Q345D seamless steel pipe also has good high-temperature performance. During the production process, equipment often needs to operate in a high-temperature environment, which requires that the steel pipe material have good high-temperature stability. Q345D seamless steel pipe can still maintain good mechanical properties and corrosion resistance in a high-temperature environment, ensuring the stable operation of production equipment. In addition, Q345D seamless steel pipe also has excellent welding and processing performance. This makes it easy to weld, cut, bend, and perform other processing operations on the steel pipe during the equipment manufacturing process, improving production efficiency and reducing production costs. At the same time, its good welding performance also ensures the quality stability of the equipment during the manufacturing process. Q345D seamless steel pipe is widely used in construction, power station equipment, petrochemical, shipbuilding, and other fields. In the field of construction, Q345D seamless steel pipe is used in the manufacture of key structures such as bridges and pillars due to its high strength and good toughness; in the field of power station equipment, its excellent high temperature resistance makes it an ideal material for manufacturing high-temperature and high-pressure boiler pipes; in the field of petrochemicals, Q345D seamless steel pipe can withstand the effects of corrosive media and is a high-quality material for manufacturing high-pressure and corrosive medium pipelines; in the field of shipbuilding, its good mechanical properties and welding properties make it an ideal choice for manufacturing ships, lifting machinery and other high-load welded structural parts. In general, Q345D seamless steel pipe has been widely used in production and other fields due to its excellent characteristics such as high strength, high corrosion resistance, and high temperature performance. With the continuous advancement of science and technology and the continuous development of the market, it is believed that the performance of Q345D seamless steel pipe will be further improved and optimized, providing strong support for the development of more fields. At the same time, we also look forward to more companies joining the research and development and production of Q345D seamless steel pipes to jointly promote the development of the seamless steel pipe industry and contribute more to the progress of society. Post time: Jul-07-2025