(1) The importance of seamless steel pipe structure for heavy industrial building structures, large-span structures, high-rise or super high-rise civil building structures or structures should consider selecting high-quality seamless steel pipes. For general industrial and civil building structures, ordinary quality seamless steel pipes can be selected according to their working properties.
(2) Seamless steel pipes with good comprehensive performance should be selected for structures that directly bear dynamic loads and structures in strong earthquake zones under the load conditions of seamless steel pipes; Generally, structures that bear static loads can choose lower priced seamless steel pipes.
(3) The welding process of connection method will produce welding deformation, welding stress and other welding defect, which may lead to cracks or brittle fracture of the structure. Therefore, the material requirements for welded structures should be stricter.
(4) The temperature and environment in which the structure is located make seamless steel pipes prone to cold brittleness at low temperatures. Therefore, for structures working under low temperature conditions, especially welded structures, killed steel with good resistance to low-temperature brittle fracture should be selected. In addition, Taiyuan seamless steel pipes with outdoor structure are prone to aging, and seamless steel pipes with harmful media are prone to corrosion, fatigue and fracture, so different materials should be selected differently.
(5) The thickness of seamless steel pipes is too high, and the rolling frequency of thin seamless steel pipes is too high. The compression ratio of rolling is large, while the compression ratio of seamless steel pipes with larger thickness is small. Therefore, precision steel pipes with larger thickness not only have lower strength, but also poor plasticity, impact toughness, and welding performance. Therefore, welded structures with large thickness should use seamless steel pipes with better materials.
