Steel Structure Billboard Posts LSAW Steel Pipe

For billboard structural applications, LSAW pipes are typically produced using Q355B or S355J2H structural steel, both providing a minimum yield strength of approximately 355 MPa and tensile strength ranging from about 470 to 630 MPa. The controlled chemical composition, with carbon generally below 0.20 percent and manganese around 1.60 percent, ensures a good balance between strength, toughness, and weldability. These properties are critical for resisting wind-induced bending moments and maintaining long-term structural integrity.

Huayang Steel Pipe manufactures large-diameter LSAW pipes using advanced JCOE forming technology, ensuring precise roundness and uniform wall thickness along the pipe body. The longitudinal seam is welded using double submerged arc welding, providing deep penetration and consistent weld quality. Each pipe undergoes ultrasonic inspection of the base material, weld seam non-destructive testing, and dimensional verification. For outdoor billboard installations, surface treatments such as hot-dip galvanizing, painting, or anti-corrosion coatings are commonly applied to enhance weather resistance and extend service life.