Square Tube
Seamless or welded square/rectangular hollow section with uniform wall, square corners and smooth welds — light, strong and versatile for steel structures, curtain-wall columns, machinery, guardrails and decoration.
| Category | Pipes & Tubes |
|---|---|
| Standards | GB, ASTM, EN, JIS, AS/NZS, GOST |
| Material / grades | Q195, Q235B, Q355B, A500 Gr.B, S235JR, S355JR, STK400 |
| Common sizes | 15×15×0.8 – 500×500×20, rect. 20×30 – 300×500 |
| Length | 6m / 9m / 12m (custom) |
| Surface | Hot-Rolled, Cold-Formed, HD Galvanized |
| Lead time | Stock orders dispatched same day; processed orders 3–5 days; custom orders scheduled on confirmation |
| Trade terms | EXW, FOB, CFR, CIF, DDP |
Detail Information
1. Square Tube — Overview
Seamless or welded square/rectangular hollow section with uniform wall, square corners and smooth welds — light, strong and versatile for steel structures, curtain-wall columns, machinery, guardrails and decoration.
2. Specifications
| Length | 6m / 9m / 12m, customizable (cut to length) |
|---|---|
| Process | HF welded & cold-formed, inner & outer deburring |
| Surface | Black / hot-dip galvanized / cold galvanized / painted |
| Material | Q195 / Q235B / Q355B / A500 Gr.B / S235JR, S355JR / STK400 |
| Standard | GB/T 6728, GB/T 3094, ASTM A500, EN 10219, JIS G 3466 |
| Size range | Square 15×15–500×500mm, rectangular 20×30–300×500mm, wall 0.8–20mm |
3. Material Grades & Standards
We supply this product in the following grades. Other grades and standards can be sourced on request.
- Q195
- Q235B
- Q355B
- A500 Gr.B
- S235JR
- S355JR
- STK400
- GB
- ASTM
- EN
- JIS
- AS/NZS
- GOST
4. Applications
- Building & construction
- Manufacturing
- Shipbuilding & offshore
5. Product Photos
6. Why Order From Shanghai Banzhijia Steel
- 20,000+ tons of ready stock across every product category
- Cutting, slitting, levelling and processing to your size
- Mill Test Certificates and export documents with each order
- Ocean freight or China–Europe rail to more than 20 countries
- Order-specific specification confirmation
- Inspection documents coordinated according to order requirements
7. Packing & Shipping
We coordinate ocean freight or China–Europe rail to the agreed destination, and prepare commercial invoices, packing lists, certificates of origin, bills of lading and Mill Test Certificates for each order.
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