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Square Steel Tube for Construction - Mill Direct Supplier
China
Supplier's customization ability
- Drawing-based customization
- Sample-based customization
- Full customization
Minimum order quantity: 1 ton
Shipping total: To be negotiated
- Lead time:
- confirmed with the quotation
- Packaging:
- standard export packing
- Samples:
- available on request
Product details
Technical Specifications of Square Steel Tube for Construction Projects
| Property | Parameter | Description |
|---|---|---|
| Product Name | Square Steel Tube for Construction Projects | Hollow structural section (HSS) with equal-sided square cross-section for structural and architectural use |
| Material Grade | Q235B / Q355B / S235JR / S355J2H / ASTM A500 Gr.B / Gr.C | Q355B equivalent to S355J2H (EN) and A572 Gr.50 (ASTM); suitable for load-bearing construction applications |
| Standard Compliance | GB/T 6728, EN 10219, ASTM A500, JIS G3466 | Cold-formed and hot-formed square hollow sections complying with major international structural standards |
| Chemical Composition (C) | ≤ 0.22% (Q355B) / ≤ 0.26% (A500 Gr.C) | Low carbon content ensures good weldability and formability for construction joints |
| Chemical Composition (Mn) | ≤ 1.60% (Q355B) / ≤ 1.35% (S355J2H) | Manganese enhances tensile strength and toughness in structural hollow sections |
| Chemical Composition (P / S) | P ≤ 0.035% / S ≤ 0.035% | Controlled phosphorus and sulfur levels minimize brittleness and improve impact resistance |
| Tensile Strength | 470–630 MPa (Q355B, per GB/T 1591) / 427–621 MPa (A500 Gr.B) | High tensile strength ensures structural integrity under static and dynamic construction loads |
| Yield Strength | ≥ 355 MPa (Q355B / S355J2H) / ≥ 315 MPa (A500 Gr.B) | Minimum yield strength guarantees resistance to permanent deformation in structural frameworks |
| Elongation | ≥ 20% (Q355B, t ≤ 16 mm) / ≥ 23% (S235JR) | Adequate elongation provides ductility for seismic and impact-resistant construction designs |
| Section Size Range | 20×20 mm – 600×600 mm | Wide size range covers light framing, columns, beams, trusses, and heavy structural applications |
| Wall Thickness | 1.0 mm – 25.0 mm | Thickness selected based on load requirements; heavier walls for primary structural members |
| Length | Standard: 6 m / 12 m; Custom: up to 16 m | Fixed or cut-to-length options available to minimize on-site waste and fabrication costs |
| Surface Finish | Mill finish (black), hot-dip galvanized (≥ 45 µm), painted, or pre-primed | Galvanized finish per ASTM A123 / EN ISO 1461 for corrosion protection in exposed construction environments |
| Application | Building frames, columns, trusses, scaffolding, curtain wall supports, bridges, industrial structures | Widely used in residential, commercial, and infrastructure construction for primary and secondary structural members |
| Certification | ISO 9001:2015, CE Marking (EN 10219), Mill Test Certificate (EN 10204 3.1) | Third-party certified quality management; MTCs traceable to heat number and chemical/mechanical test results |
| Packaging | Bundled in steel strapping (1–3 MT per bundle); wooden dunnage; optional waterproof wrapping | Secure bundling prevents transit damage; packaging customized for container, flat-rack, or bulk shipment |
| MOQ | 5 MT per size / 25 MT mixed order | Flexible MOQ supports project-based procurement; full container load (FCL) pricing available from 25 MT |
Square Steel Tube for Construction - Mill Direct Supplier
Selecting the right square steel tube for construction projects is a foundational decision that directly affects structural integrity, project timelines, and long-term cost efficiency. As a mill-direct supplier, we manufacture and export hollow square steel sections that meet the most demanding load-bearing and dimensional requirements across residential, commercial, and infrastructure applications. Our square structural tubes are produced under rigorous quality management systems, with full traceability from raw billet to finished product. Whether your project demands standard metric profiles or custom-cut lengths, our production lines maintain consistent wall thickness tolerances of ±10% and precise corner radii that comply with EN 10219, ASTM A500, and GB/T 6728 standards. With decades of combined metallurgical expertise and a global logistics network spanning over 60 countries, we deliver certified, premium-grade square steel tubes directly to your project site or warehouse — eliminating unnecessary middlemen and reducing procurement costs significantly.
What Is Square Steel Tube for Construction Projects?
A square steel tube for construction is a hollow structural section (HSS) with four equal sides, manufactured through hot-rolling or cold-forming processes from low-carbon or high-strength low-alloy (HSLA) steel. These sections serve critical roles in column systems, framework, truss assemblies, curtain wall supports, and mechanical structures where uniform multi-directional load distribution is essential. Their closed cross-section geometry delivers superior torsional rigidity compared to open profiles such as I-beams or channels, making them a preferred choice for architects and structural engineers worldwide.
Square Steel Tube for Construction Technical Specifications
Our square steel tubes for construction are available across a broad dimensional range to satisfy diverse engineering demands. Standard sizes span from 20×20 mm up to 400×400 mm, with wall thicknesses from 1.5 mm to 20 mm. Material grades include Q235B, Q355B, S235JR, S355J2H, and ASTM A500 Grade C, with a minimum yield strength of 355 MPa and tensile strength reaching 510–680 MPa. Surface finishes include black (mill scale), hot-dip galvanized (85 µm average coating), and pre-painted options.
| Parameter | Specification |
|---|---|
| Size Range | 20×20 mm – 400×400 mm |
| Wall Thickness | 1.5 mm – 20 mm |
| Standard Length | 6 m / 12 m (custom lengths available) |
| Material Grades | Q235B, Q355B, S235JR, S355J2H, ASTM A500 Gr.C |
| Minimum Yield Strength | 235 MPa – 420 MPa (grade-dependent) |
| Tensile Strength | 510 – 680 MPa |
| Applicable Standards | EN 10219, ASTM A500, GB/T 6728, JIS G3466 |
| Surface Treatment | Black, HDG (≥85 µm), Epoxy-coated |
| Steel Density | 7.85 g/cm³ at 20°C |
| Elongation at Break | ≥22% (S355J2H per EN 10219) |
Get a Competitive Quote for Square Steel Tube for Construction
Ready to source mill-direct square steel tubes for your next construction project? Our team provides detailed technical consultation, rapid sampling, and transparent mill-direct rates that consistently outperform distributor pricing. Submit your specifications today and receive a tailored quotation within 24 hours.
- 24/7 customer support available
- Free samples for quality evaluation
- Competitive pricing for bulk orders
- Professional technical consultation
Contact us today to get your free quote within 24 hours!
