HIGH-STRENGTH SQUARE & RECTANGULAR HOLLOW SECTIONS (SHS & RHS) FROM VIETNAM
Efreso is your direct B2B sourcing partner for prime-grade Square (SHS) and Rectangular (RHS) Hollow Sections, rolled and formed by Vietnam’s most advanced automated structural tubing complexes. Produced using Electric Arc Furnace (EAF) low-emission steel substrates, our hollow sections deliver razor-sharp $90^\circ$ corners, 100% ultrasonically tested high-frequency weld seams, and exceptional compression resistance for pre-engineered building (PEB) fabricators, industrial machinery builders, and structural steel distributors worldwide.
By sourcing hollow sections from Efreso, global industrial buyers completely eliminate carbon border adjustment (CBAM) tax risks while securing preferential 0% import duties through Vietnam’s comprehensive Free Trade Agreement network.
3. TECHNICAL SPECIFICATIONS & STRUCTURAL COMPLIANCE MATRIX
Our hollow structural sections are manufactured and tested to conform strictly to major international engineering standards (JIS, ASTM, EN), ensuring uncompromised load-bearing safety.
| Technical Parameter | Square Hollow Sections (SHS) | Rectangular Hollow Sections (RHS) |
|---|---|---|
| Manufacturing Process | EAF Low-Carbon HRC Substrate ➔ Cold Rolling ➔ High-Frequency Induction (HFI) Welding ➔ Sizing & Shaping | |
| International Standards |
JIS G3466: STKR400, STKR490 ASTM A500: Grade A, Grade B, Grade C EN 10219: S235JRH, S355JOH, S355J2H |
JIS G3466: STKR400, STKR490 ASTM A500: Grade A, Grade B, Grade C EN 10219: S235JRH, S355JOH, S355J2H |
| Size / Dimensions Range | $20 \times 20\text{ mm}$ up to $300 \times 300\text{ mm}$ | $30 \times 20\text{ mm}$ up to $400 \times 200\text{ mm}$ |
| Wall Thickness Range | $1.2\text{ mm}$ to $16.0\text{ mm}$ | $1.2\text{ mm}$ to $16.0\text{ mm}$ |
| Dimensional Tolerances | Outside Dimension Tolerance: $\pm 1.0\%$; Wall Thickness Tolerance: $\pm 10\%$; Squareness: $90^\circ \pm 0.5^\circ$ | |
| Surface & Ends Finish | Clean un-oiled or lightly oiled hot-rolled finish; square cut ends, free from burrs | |
| Compliance & Traceability | Mill Test Report (MTR EN 10204 3.1), EPD, GHG Inventory Report, ISO 9001:2015 | |
4. BUSINESS BENEFITS FOR PEB FABRICATORS & STRUCTURAL ENGINEERS (FAB MODEL)
🏗️ Sharp Corners & Uniform Wall
Precise $90^\circ$ Corner Radius & Straight Edges:Advanced cold-forming technology ensures crisp corner profiles and minimal twist, allowing gusset plates, connection brackets, and base plates to fit flush without costly on-site grinding or shimming.
Consistent Compression Strength:High-frequency automated weld seam annealing guarantees uniform structural integrity across all four sides, maximizing axial load capacity for columns, trusses, and frames in PEB buildings.
🌿 CBAM Exemption & Low-Carbon Steel
30%–50% Reduced Carbon Intensity:Manufactured from EAF steelmaking plants powered by clean energy grids, Efreso’s hollow sections drastically lower embodied Scope 3 carbon per ton compared to traditional Blast Furnace steel.
Audit-Ready EPD Documentation:Verified Environmental Product Declarations (EPD) accompany every shipment, protecting European and North American projects from heavy carbon border tax penalties.
💰 Landed Cost Savings via FTAs
0% Preferential Import Duties:Leverage Vietnam’s trade agreements (EVFTA, CPTPP, RCEP, UKVFTA) to import certified hollow sections duty-free or under reduced tariff schedules.
Optimized Project Margins:Secure lower landed procurement costs, allowing your PEB manufacturing or distribution business to maintain strong price competitiveness in regional and global structural tenders.
5. EFRESO SURFACE PROTECTION & EXPORT PACKAGING PROTOCOL
“Structural hollow sections require strict moisture protection and compact bundling. We guarantee zero transit deformation and rust-free port arrival.”
- 100% Weld Seam UT / Eddy Current
- Carbon Footprint Verification
- Laser Squareness & Wall Gauge Check
- Independent SGS / BV Inspection
- Weatherproof Metal Heat Tags
- Anti-Rust Oiled Surface Protection
- Bundled & Lashed in Containers
- Desiccant Packs for Sea Transit
Export Packaging & Weather Protection: Hollow sections are tightly bundled with heavy-duty steel strapping, tagged with unique heat numbers for full traceability, and treated with light anti-rust oil or wrapped in protective film to withstand long marine transits.
Third-Party Lab Verification: Independent inspection agencies (SGS, Bureau Veritas, or Intertek) verify yield strengths, wall thickness tolerances, squareness, and package weight prior to vessel loading.
6. QUALITY GUARANTEE & B2B INQUIRY
Our Sourcing Commitment
Efreso guarantees that 100% of delivered square and rectangular hollow sections conform strictly to your contract’s specified standard codes (ASTM, JIS, EN), wall thickness tolerances, and mechanical property minimums. Any material non-conformities identified during independent port inspections are fully backed by transparent contract replacement protocols.
Request a Hollow Sections Project Quote
Connect with our structural sales engineers today for competitive FOB/CIF rates, request original Mill Test Reports, or obtain the complete EPD Compliance Pack for your PEB and industrial engineering tenders.