350×350×12 mm S420MC–S600MC High-Strength Square Hollow Section
350x350x12mm 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 122.507 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 12mm 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 | 350mm × 350mm × 12mm |
| Weight per Meter | 122.507 kg/m |
| Material | Steel |
| Alloy/Grade | S420MC, S500MC, S600MC |
| 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) | 156 cm² |
| Second moment of area(I) | 29054 cm⁴ |
| Radius of gyration(i) | 13.6 cm |
| Elastic section modulus(Wel) | 1660 cm³ |
| Plastic section modulus(Wpl) | 1949 cm³ |
| Torsional inertia constant(It) | 47598 cm⁴ |
| Torsional modulus constant(Ct) | 2552 cm³ |
| Surface area per metre(As) | 1.34 m²/m |
| Length per tonne | 8.16 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 | 697 kNm | 6554 kN | 16 mm · 159 kg/m (+30%) |
| S500MC | 500 MPa | 550–700 MPa | 830 kNm | 7803 kN | Beyond the S355J2H range of this size |
| S600MC | 600 MPa | 650–820 MPa | 996 kNm | 9364 kN | Beyond the S355J2H range of this size |
In S420MC, this section (123 kg/m) carries the elastic bending load of a 16 mm S355J2H wall in the same outer size (159 kg/m), which is 30% heavier per metre. In S600MC, 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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