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 primary concern, Q345 spiral steel pipe is a suitable option due to its higher tensile strength. On the other hand, if stiffness is the main factor, Q235 may be more appropriate. Although Q345 is slightly more expensive, its high strength can lead to material savings, making it cost-effective in the long run. A comprehensive evaluation based on these factors is recommended for the best selection.
The difference between Q235 and Q345 lies in their yield strengths—235 MPa and 345 MPa respectively. While Q345 is marginally pricier, the price gap is not significant. Q235 is commonly used for general metal structural components, parts that require carburizing or cyaniding with low core strength requirements, such as tie rods, connecting rods, hooks, couplers, bolts, nuts, sleeves, shafts, and welded joints.
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 applications, mechanical parts, building structures, and for low- to medium-pressure vessels, oil tanks, vehicles, cranes, mining equipment, power stations, bridges, and more. It is especially suitable for use in cold regions where temperatures drop below -40°C. Its versatility and performance make it a popular choice across various industries.
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