Q355B square tubes are a type of structural square tube, known for their excellent workability and compressive strength. Due to their low carbon nature, they also possess good anti-corrosion properties and form an anti-corrosion protective film on the surface.

Q355B steel is a low-alloy high-strength structural steel, widely used in bridges, vehicles, ships, buildings, pressure vessels, and special equipment. The "Q" signifies yield strength, with 355 indicating the yield strength of this steel is 355MPa, which decreases with the increase in material thickness.

The Q355B square tube welding employs a new welding technique that utilizes the skin effect and proximity effect of high-frequency current to connect steel plates with other metallic materials. The emergence and maturation of high-frequency welding technology are critical processes in the production of Q355B square tubes. The quality of high-frequency welding directly affects the overall strength, quality level, and production speed of the welded pipe products.

Q355B square tubes offer excellent weldability and corrosion resistance. They are suitable for containers used in applications like oil transportation or chemical component protection. Consequently, these tubes can be used in the manufacturing of oil storage tanks, high-pressure vessels, boilers, ships, power stations, and various other high-load structural components. They are durable in such environments, less prone to damage from environmental and weather factors.