400×300×8 mm S420MC–S700MC High-Strength Rectangular Hollow Section
400x300x8mm Steel high-strength rectangular 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 84.185 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 rectangular tube is commonly specified for heavy structural supports, load-bearing frames, and demanding industrial applications. The 8mm 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 | 400mm × 300mm × 8mm |
| Weight per Meter | 84.185 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) | 107 cm² |
| Second moment of area(Ix) | 25122 cm⁴ |
| Second moment of area(Iy) | 16212 cm⁴ |
| Radius of gyration(ix) | 15.3 cm |
| Radius of gyration(iy) | 12.3 cm |
| Elastic section modulus(Wel,x) | 1256 cm³ |
| Elastic section modulus(Wel,y) | 1081 cm³ |
| Plastic section modulus(Wpl,x) | 1487 cm³ |
| Plastic section modulus(Wpl,y) | 1224 cm³ |
| Torsional inertia constant(It) | 31179 cm⁴ |
| Torsional modulus constant(Ct) | 1747 cm³ |
| Surface area per metre(As) | 1.37 m²/m |
| Length per tonne | 11.9 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 | 528 kNm | 4504 kN | 10 mm · 104 kg/m (+24%) |
| S500MC | 500 MPa | 550–700 MPa | 628 kNm | 5362 kN | 12.5 mm · 127 kg/m (+51%) |
| S600MC | 600 MPa | 650–820 MPa | 754 kNm | 6435 kN | 16 mm · 159 kg/m (+89%) |
| S700MC | 700 MPa | 750–950 MPa | 879 kNm | 7507 kN | Beyond the S355J2H range of this size |
In S600MC, this section (84.2 kg/m) carries the elastic bending load of a 16 mm S355J2H wall in the same outer size (159 kg/m), which is 89% 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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