□250×150×8
□250×150×8 Rectangular tube (GB/T 6728)
Dimensions
| Parameter | Symbol | Value | Unit | Data |
|---|---|---|---|---|
| Depth | d | 250.0 | mm | U |
| Width | b | 150.0 | mm | U |
| Thickness | t | 8.0 | mm | U |
| Outer corner radius (assumed) | ro | 20.0 | mm | U |
Section Properties
| Parameter | Symbol | Value | Unit | Data |
|---|---|---|---|---|
| General | ||||
| Mass per metre | mass | 46.50 | kg/m | C |
| Gross area | A | 5,924 | mm² | C |
| About x-axis (major) | ||||
| Second moment of area Ix | Ix | 48.850 | 10⁶ mm⁴ | C |
| Elastic section modulus Zx (min) | Zx | 390.8 | 10³ mm³ | C |
| Plastic section modulus Sx | Sx | 482.1 | 10³ mm³ | C |
| Radius of gyration rx | rx | 90.8 | mm | C |
| About y-axis (minor) | ||||
| Second moment of area Iy | Iy | 22.190 | 10⁶ mm⁴ | C |
| Elastic section modulus Zy (min) | Zy | 295.9 | 10³ mm³ | C |
| Plastic section modulus Sy | Sy | 339.5 | 10³ mm³ | C |
| Radius of gyration ry | ry | 61.2 | mm | C |
| Torsion & warping | ||||
| Torsion constant JThin-walled closed-section approximation | J | 50.504 | 10⁶ mm⁴ | C |
| Surface area | ||||
| External surface area | extArea | 0.766 | m²/m | C |
| Internal surface area | intArea | 0.715 | m²/m | C |
Steel Grades
| Grade | Standard | fy MPa | fu MPa | Note | Data |
|---|---|---|---|---|---|
| Q235B | GB/T 700:2006 | 235 | 370 | Common grade | U |
| Q355B | GB/T 1591:2018 | 355 | 470 | Common grade | U |
Strengths shown for governing thickness t = 8.0 mm. Density 7850 kg/m³, E = 200 000 MPa.
Where to buy
Producers of Hollow sections & pipes – local mills first. Buy direct from the mill for large tonnages, or through a steel distributor / stockist for small quantities and cut lengths.
Local producer
Standards: GB/T 8162, GB/T 8163
International producer
Standards: JIS G 3444
International producer
Standards: EN 10210, EN 10219
International producer
Standards: JIS G 3444, JIS G 3466
International producer
Standards: ASTM A500, ASTM A1085
International producer
Standards: AS/NZS 1163
Buying checklist
- Specify the section designation, product standard and steel grade exactly (e.g. "□250×150×8 – GB/T 6728:2017 – Q235B").
- Ask for mill test certificates (EN 10204 type 3.1 or equivalent) traceable to the heat number.
- Sections from another standard system are not automatically equivalent – have the engineer approve any substitution.
- Check availability, minimum order quantity, stock lengths, lead time and delivery terms with the mill or distributor.
All producers of this product type →
Listing is informational only – not an endorsement, offer or confirmation of availability. Company details are marked UNVERIFIED until checked.
Source & Verification
- Source publisher
- Pending verification – nominal dimensions entered by the application developer
- Source document
- GB/T 6728:2017 Cold formed steel hollow sections for general structure
- Edition
- 2017
- Publication year
- 2017
- Page reference
- —
- Last updated
- 2026-10-12
- Verification status
- Unverified
Outer corner radius assumed as 2.5t (GB/T 6728 permits a range) for property calculation; confirm against GB/T 6728:2017 Cold formed steel hollow sections for general structure and the manufacturer catalogue. Typical grade: Q355B.