Pre-Galvanized Square & Rectangular Steel Tube

QIDAMT · GALVANIZED TUBE

Pre-Galvanized Square & Rectangular Steel Tube – Q235B

Q235B square and rectangular tube with pre-galvanized coating for frames, racks, solar supports and fencing.

Pre-galvanized square and rectangular steel tube is formed from galvanized strip and welded into a closed section, then cut to length. The zinc coating covers the whole surface including corners, and the clean, bright finish makes it ready for use or painting without further treatment — ideal for racks, frames and structural sections.

Key Advantages

All-Round Coating

Zinc covers surface and corners uniformly.

Ready to Use

Bright finish, no pre-treatment required.

Square Corners

Clean edges for neat joints and frames.

Weldable

Good weldability with local touch-up.

Composição química (Q235B Base)

Elemento	C	Mn	E	P	S	Fé
Contente %	0.12 – 0.20	0.30 – 0.70	≤ 0.30	≤ 0.045	≤ 0.045	Balance

Propriedades mecânicas

Yield strength: ≥ 235 MPa
Tensile strength: 370 – 500 MPa
Alongamento (δ): ≥ 26 %
Zinc coating: 20 – 40 μm (Z60 – Z120)
Densidade: 7.85 g/cm³

Standard Sizes

Parameter	Range
Square section	20×20 – 200×200 mm
Rectangular section	20×30 – 150×200 mm
Wall thickness	0.8 – 8.0 milímetros
Comprimento	6 m standard, cut to order
Padrão	GB/T 6728 / EM 10219 / ASTM A500 / JIS G3466

Formulários

Pre-galvanized square and rectangular tube is used for storage racks and display frames, solar panel mounting structures, greenhouse frames, guardrail posts and fencing, furniture frames, garage and gate structures, tent and awning frames, and light structural sections. For round profiles see our hot-dip galvanized round tube.

Processing & Embalagem

Cutting, drilling, punching and bending available. Tubes are bundled with steel straps and packed in wooden crates or on pallets with corner protection.