Products

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.

Rongheng supplies ERW Square Steel Tube for Curtain Wall applications where section accuracy, straightness, surface condition and outdoor corrosion protection need to be considered together. The product range covers hot-dip galvanized square and rectangular tubes, precision cold-drawn sections and precision architectural steel profiles, with Q235B, Q355B and Q355D available for different project requirements.

Rongheng Spiral Welded Steel Pipe is manufactured from hot-rolled steel strip using automatic double-sided submerged arc welding and CNC spiral forming. Available in diameters from 219 mm to 3,620 mm and wall thicknesses from 6 mm to 30 mm, it covers Q235B, Q355B and L245–L485 pipeline steel grades. The pipe is designed for large-diameter water, drainage, oil and gas, piling and infrastructure projects, with options for fixed lengths, end beveling and external corrosion protection.

Product: ERW Rectangular Steel Tube
Steel Grades: Q195, Q235, Q355 and equivalent grades
Sizes: Multiple rectangular sections and custom dimensions
Surface: Black or hot-dip galvanized
MOQ: 1 × 20-foot container, approximately 20–25 tons
Lead Time: Normally 15–25 days, depending on specification and order quantity
ERW Rectangular Steel Tube is produced by roll forming steel strip and welding the formed edges using high-frequency electric resistance welding. It is widely used for structural frames, machinery, construction, fencing and general fabrication. Rongheng supplies different section sizes, wall thicknesses, lengths and surface treatments according to project and purchasing requirements.