According to the specific structural design of spiral steel pipes, the choice between Q235 and Q345 depends on whether the structure is governed by strength or stiffness requirements. If strength is the main concern, Q345 spiral steel pipe is a suitable option due to its higher tensile strength. On the other hand, if stiffness is the key factor, Q235 may be more appropriate. Although Q345 is slightly more expensive, its higher strength allows for potential material savings, making it a cost-effective choice in many cases. A comprehensive evaluation based on these factors will help determine the best fit for the project.
The difference between Q235 and Q345 lies in their yield strengths—235 MPa for Q235 and 345 MPa for Q345. While the price difference is not significant, the performance benefits of Q345 make it a preferred choice in applications where structural integrity is critical.
Q235 is commonly used for general metal structures, parts that require carburizing or cyaniding with lower core strength requirements, such as tie rods, connecting rods, hooks, couplers, bolts, nuts, sleeves, shafts, and welded components. It’s ideal for applications where high strength is not the primary requirement.
Q345, on the other hand, offers excellent mechanical properties, including good toughness, ductility, and weldability. It performs well even at low temperatures and is widely used in structural components, machinery parts, building frameworks, and pressure vessels operating under medium to low pressure. It is also commonly found in oil tanks, vehicles, cranes, mining equipment, power stations, and bridges. This grade is especially suitable for use in cold climates, as it remains effective at temperatures as low as -40°C.
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