Details of Q345D seamless steel pipe
Chemical composition of Q345D seamless 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.
Mechanical properties of Q345D seamless 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 impact -20℃: longitudinal not less than 40, transverse not less than 27
First, let’s take a look at the performance characteristics of Q345D seamless steel pipe. As a low-alloy high-strength structural steel, Q345D seamless steel pipe has high yield strength and tensile strength, which can meet the bearing requirements of various engineering structures. Its yield strength reaches 345MPa, and its tensile strength is between 490~670MPa, which makes it perform well under heavy loads and complex stress environments. In addition, Q345D seamless steel pipe also has good low-temperature toughness, and can maintain good toughness and impact resistance even at lower temperatures, so it is suitable for cold areas and low-temperature environments.
In addition to excellent mechanical properties, Q345D seamless steel pipe also has good welding performance and corrosion resistance. With the appropriate welding process, high-quality welding joints can be obtained, making Q345D seamless steel pipe widely used in various welded structures. At the same time, after surface treatment, Q345D seamless steel pipe can resist the erosion of corrosive environments such as acids and alkalis, thereby extending its service life.
Next, let’s take a look at the application areas of Q345D seamless steel pipe. Due to its excellent comprehensive performance, Q345D seamless steel pipe plays an important role in many fields. In the field of construction, Q345D seamless steel pipe is widely used in the support and connection of structures such as bridges and high-rise buildings. In the field of shipbuilding and vehicle manufacturing, Q345D seamless steel pipe is used as a key component, such as hulls and frames, due to its high strength and good welding performance. In addition, in industrial fields such as the petroleum and chemical industry, Q345D seamless steel pipe is also used as a manufacturing material for equipment such as pipelines and containers.
The advantages of Q345D seamless steel pipe are not only reflected in its excellent performance and wide application fields, but also in its manufacturing and processing. As a seamless pipe, Q345D seamless steel pipe has the characteristics of high shape and size accuracy, good air tightness and water tightness, which enables it to maintain stable performance under complex environments such as high pressure, high temperature, and low temperature. In addition, Q345D seamless steel pipe also has good processing performance, and can be cut, bent, welded, and undergo other operations, which provides convenience for construction and maintenance.
However, despite the many advantages of Q345D seamless steel pipe, some problems still need to be paid attention to during use. First of all, when purchasing Q345D seamless steel pipe, it should be ensured that its chemical composition and mechanical properties meet the requirements of relevant standards to ensure the stability of its quality and performance. Secondly, during the processing and installation process, relevant specifications and standards should be followed to ensure correct, safe, and reliable operation. Finally, the Q345D seamless steel pipe should be inspected and maintained regularly during use to detect and deal with potential problems in a timely manner to extend its service life.
In summary, Q345D seamless steel pipe has become an indispensable material in modern industry with its excellent performance, wide application fields, and convenient processing. In future development, with the continuous advancement of science and technology and the continuous improvement of engineering needs, Q345D seamless steel pipe will continue to play its important role and provide strong support for the development of various fields.
Post time: Jul-28-2025