Shandong Dayang supplies square and rectangular steel tubes (hollow
sections) for structural, agricultural and general fabrication use. Our standard range
covers sizes from 20 × 20 mm to 150 × 150 mm, with wall thickness from 1.5 mm to 8 mm, in
grades Q235B and Q355B, in fixed lengths of 6 m, 9 m and 12 m.
Specifications
| Item | Range / Standard |
|---|---|
| Product | Square tube, rectangular tube (ERW hollow section) |
| Size | 20 × 20 mm – 150 × 150 mm |
| Wall thickness | 1.5 mm – 8 mm |
| Length | 6 m / 9 m / 12 m fixed |
| Grade | Q235B, Q355B |
| Surface | Black (pre-galvanized and hot-dip galvanized available on request) |
Grades and Standards
| Grade | Equivalent | Typical Use |
|---|---|---|
| Q235B | SS400, A36, S235JR | General frames and structures |
| Q355B | S355JR, A572 Gr.50 | Load-bearing structures |
Applications
- Steel structure frames and trusses
- Guardrails and fencing
- Greenhouse and agricultural shed frames
- Shelf and rack supports
- Furniture and display stand fabrication
- Handrail and balustrade systems
Packing and Delivery
| Item | Details |
|---|---|
| Bundling | 【待填：每捆支数 / 单捆重量】 |
| Loading | 【待填：20GP / 40HQ 装柜吨位】 |
| Custom size | 【待填：非标尺寸起订量】 |
| Trade terms | FOB, CIF, CFR |
Quality Assurance
Mill test certificates issued with every batch. Wall thickness and outer dimension can
be verified by third-party inspection on request.
FAQ
Q: Can the tube be galvanized?
A: Yes. Pre-galvanized and hot-dip galvanized square tubes are available. Please specify
the zinc coating requirement (for example Z120, Z275) when inquiring.
Q: Do you supply rectangular tube?
A: Yes. Rectangular hollow sections are supplied in the same wall thickness range. Send us
the dimensions you need.
Q: What is the difference between square tube and square bar?
A: Square tube is hollow with a wall thickness; square bar is solid. If your application
needs solid steel, please inquire for square bar instead.