Square tube
Structural band for columns, portal frames and heavy machine bases. Wall held to ±10 % and squareness to 90° ±1°, per GB/T 6728 or EN 10219.
Cross-section
Outside dimension 200×200 mm, wall 6.0–12.0 mm, corner radius 2–3 × wall.
Specification
| Section | 200×200 mm |
|---|---|
| Wall range | 6.0 – 12.0 mm |
| Weight / m | 36.55 – 70.84 kg |
| Length | 6 / 9 / 12 m, or cut to length |
| Production line | 200 |
| Standards | GB/T 6728 · GB/T 3094 · EN 10219 · ASTM A500 |
| Tolerance | Wall ±10 % · squareness 90° ±1° · straightness ≤0.15 % L |
| Certificate | EN 10204 3.1 mill certificate with every heat |
Weights assume 7.85 g/cm³. In stock — ships in 3 days.
Grades
Other grades and equivalent EN / ASTM designations are quoted on request. Tell us the standard, not just the grade — we will match it.
Applications
Cut to length and drilled to your DXF, delivered as a bolt-on part.
Mill certificate traceable to the heat, so your inspector signs off without a second trip.
Consistent wall and squareness batch to batch — welding fixtures stay in tolerance.
FAQ
Yes — Q355B is held in stock and ships within 3 days.
Between 36.55 and 70.84 kg/m across the 6.0–12.0 mm wall range (theoretical, 7.85 g/cm³).
Q235B, Q355B–E, Q420B, 510L/610L/700L, 500TM/700TM and SPA-H; other grades on request.
Nearby sizes
Send the drawing or the standard — quote within 48 hours.