Factory Direct Steel Pipes and Tubes with Competitive Prices

Zinc-Aluminum-Magnesium Coated Square Steel Tube combines a square hollow steel section with a zinc-aluminum-magnesium protective coating. It is mainly used where the steel section needs both structural strength and long-term corrosion protection, including solar mounting systems, outdoor steel structures, equipment frames, fences and other exposed applications.

Zinc-Aluminum-Magnesium Coated Round Steel Pipe is designed for outdoor steel structures, photovoltaic systems, agricultural structures, guardrails and other applications where corrosion protection and a circular steel section are both required. The round section distributes loads around the circumference and works well for curved structures, handrails, arches and tubular supports.

Hot-Dip Galvanized Spiral Steel Pipe is manufactured from hot-rolled steel strip through spiral forming, double-sided submerged arc welding and subsequent hot-dip galvanizing. It is designed for large-diameter water transmission, drainage, foundation, industrial piping and outdoor projects where both structural strength and corrosion protection are required. Available in DN200–DN3000, with Q235B and Q355B grades, 3–20 mm wall thickness and customized lengths and end processing.

Hot-Dip Galvanized Rectangular Steel Tube combines a rectangular hollow section with full hot-dip zinc protection. Q235B and Q355B steel grades are available in sizes from 20×40 to 200×400 mm, with 1.0–6.0 mm wall thickness and 3–12 m fixed lengths. The longer and shorter sides give the section useful directional stiffness for frames, rails, supports, curtain wall structures, PV systems, machinery bases and outdoor steelwork. Zinc coating options range from 40–120 g/m² for general use to 200–275 g/m² for higher-corrosion environments. Cutting, bending, punching, slotting, drilling, end closing and other processing can be supplied to drawing.

Rongheng Hot-Dip galvanized square steel tube is manufactured from Q235B or Q355B carbon steel through cold forming, high-frequency welding, sizing, and hot-dip galvanizing. Available in 20×20 to 200×200 mm sections with wall thicknesses from 1.0 to 6.0 mm, it is designed for steel structures, guardrails, machinery frames, PV supports, outdoor infrastructure, and other applications where dimensional accuracy and corrosion protection are required. Standard 6 m lengths and custom 3–12 m lengths are available, together with cutting, bending, punching, slotting, and other processing services.

Hot-Dip Galvanized Round Steel Pipe uses Q235B or Q355B carbon steel and a factory hot-dip zinc coating for outdoor corrosion protection. Common sizes cover DN15–DN200, with wall thicknesses from 1.5–8.0 mm depending on diameter. It is used for guardrails, greenhouse frames, handrails, supports, columns and selected low-pressure fluid applications.