250×250×9 mm S420MC–S700MC High-Strength Square Hollow Section
250x250x9mm Steel high-strength square tube in S420MC, S500MC, S600MC, S700MC to EN 10219 / EN 10149-2, with an uncoated steel surface suitable for further processing or painting. Nominal weight 65.923 kg/m.
Minimum order
Minimum 10 t per size. If the size is already in the current production cycle, we can accept orders from 5 t. Standard length 6 m; 4–12 m on request. We confirm the minimum, lead time and grade in your quote.
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Minimum order: 10 t per size (from 5 t if the size is in production)
Applications & Usage
This extra heavy-duty industrial Steel high-strength square tube is commonly specified for heavy structural supports, load-bearing frames, and demanding industrial applications. The 9mm wall thickness provides exceptional structural integrity while maintaining workability. The natural mill finish provides a cost-effective solution for applications where aesthetics are secondary. Available in standard lengths of 6m, this profile can be easily cut, drilled, and welded to suit your specific requirements.
Technical Specifications
| Specification | Value |
|---|---|
| Dimensions | 250mm × 250mm × 9mm |
| Weight per Meter | 65.923 kg/m |
| Material | Steel |
| Alloy/Grade | S420MC, S500MC, S600MC, S700MC |
| Standard | EN 10219 / EN 10149-2 |
| Standard Length | 6m |
| Minimum Order per Size | 10 t |
| Cut-to-Length Range | 4000 – 12000 mm |
Section Properties
Nominal values calculated from nominal dimensions to EN 10219-2.
| Property | Value |
|---|---|
| Cross-sectional area(A) | 84.0 cm² |
| Second moment of area(I) | 7984 cm⁴ |
| Radius of gyration(i) | 9.75 cm |
| Elastic section modulus(Wel) | 639 cm³ |
| Plastic section modulus(Wpl) | 750 cm³ |
| Torsional inertia constant(It) | 12913 cm⁴ |
| Torsional modulus constant(Ct) | 972 cm³ |
| Surface area per metre(As) | 0.961 m²/m |
| Length per tonne | 15.2 m |
High-strength grades for this size
Strength and indicative capacity for each grade this size is rolled in, compared with the S355J2H wall that carries the same bending load in the same outer size.
| Grade | Min. yield ReH | Tensile Rm | Bending Wel·ReH | Axial A·ReH | S355J2H equivalent |
|---|---|---|---|---|---|
| S420MC | 420 MPa | 480–620 MPa | 268 kNm | 3527 kN | 12 mm · 84.8 kg/m (+29%) |
| S500MC | 500 MPa | 550–700 MPa | 319 kNm | 4199 kN | 16 mm · 109 kg/m (+65%) |
| S600MC | 600 MPa | 650–820 MPa | 383 kNm | 5039 kN | Beyond the S355J2H range of this size |
| S700MC | 700 MPa | 750–950 MPa | 447 kNm | 5879 kN | Beyond the S355J2H range of this size |
In S500MC, this section (65.9 kg/m) carries the elastic bending load of a 16 mm S355J2H wall in the same outer size (109 kg/m), which is 65% heavier per metre. In S700MC, this section carries more elastic bending load than any S355J2H wall rolled in the same outer size; matching it in S355 needs a larger section.
Indicative values from nominal dimensions: Wel × ReH and A × ReH, without buckling, cross-section class or partial safety factors. Not a design check.
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