CN · HM · HM medium-flange H-sections
HM588×300×12×20
HM588×300×12×20 Medium-flange H-section (GB/T 11263)
Dimensions
| Parameter | Symbol | Value | Unit | Data |
|---|---|---|---|---|
| Depth | d | 588.0 | mm | U |
| Flange width | bf | 300.0 | mm | U |
| Flange thickness | tf | 20.0 | mm | U |
| Web thickness | tw | 12.0 | mm | U |
| Root radius | r1 | 13.0 | mm | U |
Section Properties
| Parameter | Symbol | Value | Unit | Data |
|---|---|---|---|---|
| General | ||||
| Mass per metre | mass | 146.96 | kg/m | C |
| Gross area | A | 18,721 | mm² | C |
| About x-axis (major) | ||||
| Second moment of area Ix | Ix | 1,143.529 | 10⁶ mm⁴ | C |
| Elastic section modulus Zx (min) | Zx | 3,889.6 | 10³ mm³ | C |
| Plastic section modulus Sx | Sx | 4,348.3 | 10³ mm³ | C |
| Radius of gyration rx | rx | 247.1 | mm | C |
| About y-axis (minor) | ||||
| Second moment of area Iy | Iy | 90.091 | 10⁶ mm⁴ | C |
| Elastic section modulus Zy (min) | Zy | 600.6 | 10³ mm³ | C |
| Plastic section modulus Sy | Sy | 921.0 | 10³ mm³ | C |
| Radius of gyration ry | ry | 69.4 | mm | C |
| Torsion & warping | ||||
| Torsion constant JApproximate thin-walled value, fillets neglected | J | 1.916 | 10⁶ mm⁴ | C |
| Warping constant IwIy·(d−tf)²/4 | Iw | 7,266.41 | 10⁹ mm⁶ | C |
| Surface area | ||||
| External surface area | extArea | 2.330 | m²/m | C |
Nominal designation mass 147.00 kg/m; calculated 146.96 kg/m (-0.0%).
Steel Grades
| Grade | Standard | fy MPa | fu MPa | Note | Data |
|---|---|---|---|---|---|
| Q235B | GB/T 700:2006 | 225 | 370 | Common grade | U |
| Q355B | GB/T 1591:2018 | 345 | 470 | Common grade | U |
Strengths shown for governing thickness t = 20.0 mm. Density 7850 kg/m³, E = 200 000 MPa.
Where to buy
Producers of Hot-rolled beams & columns (I / H / W) – 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 11263, EN 10365, ASTM A6
Profile U
Local producer
Standards: GB/T 11263
Profile U
Local producer
Standards: GB/T 11263
Profile U
International producer
Standards: EN 10365, BS 4-1, EN 10025
International producer
Standards: EN 10365, EN 10025
International producer
Standards: JIS G 3192, JIS G 3136
Buying checklist
- Specify the section designation, product standard and steel grade exactly (e.g. "HM588×300×12×20 – GB/T 11263:2017 – 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 11263:2017 Hot-rolled H and cut T section steel
- Edition
- 2017
- Publication year
- 2017
- Page reference
- —
- Last updated
- 2026-10-12
- Verification status
- Unverified
Nominal dimensions require verification against the current edition of GB/T 11263:2017 Hot-rolled H and cut T section steel and the manufacturer catalogue before design use. Properties are calculated by this application from the nominal dimensions.