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Heavy H-Section Columns
Built-up heavy H-section columns with thick flanges for multi-storey frames, heavy equipment supports and process structures. Welded on submerged-arc lines with full-penetration flange welds where the design requires them, ultrasonically tested, straightened and drilled for the beam connections before coating.
Heavy H columns are built up from plate when a rolled section is not deep or thick enough for the axial load and moment. Flange-to-web welds are made on automated submerged-arc lines, which gives the deep penetration and consistent profile a thick-flange column needs.
After welding, columns are straightened, drilled on CNC lines for the beam and bracing connections and fitted with base plates and splice plates. Critical full-penetration welds are UT or MT tested with a report per member before the column goes to blasting and coating.
Part of Heavy Core Framework in Multi-Storey Steel Buildings . Other components in this sub-system: Box / Rectangular Columns · Cruciform Columns · Circular Columns · Steel Floor Beams
Technical Specifications
| Item | Specification |
|---|---|
| Material | S355 / S460 to EN 10025 or ASTM A36 / A992, EN 10204 type 3.1 certificates |
| Fabrication | Plate cut on CNC lines, flanges and web welded on submerged-arc lines, straightened after welding |
| Welding | AWS D1.1 / EN ISO 9606 qualified procedures; full-penetration welds where the design requires them |
| NDT | 100% UT or MT on critical full-penetration welds to ISO 11666 / AWS D1.1 |
| Tolerances | Shop drawings to ISO 2768-m; execution to EN 1090-2 EXC2 (certificate 2787-CPR-01627) |
| Coating | Shot blast to Sa 2.5, ISO 12944 system for the site environment, DFT recorded |
Section sizes, grades and quantities for this product are issued with the quotation once your design basis and loads are received.
Advantages vs Engineering Considerations
| Advantages | Engineering Considerations |
|---|---|
| Submerged-arc welding for thick flangesAutomated SAW lines give deep penetration and a consistent profile on thick-flange built-up sections. | Floor systems such as decking and composite slabs add wet trades and curing time compared with a single-storey frame. |
| Tested before coatingCritical full-penetration welds are 100% UT or MT tested with a report per member. | Vibration and deflection limits of long floor spans often govern member sizes more than strength. |
| Splices for the storeyColumns are fabricated in storey-height or two-storey lengths with bolted or welded splices as designed, loaded according to length. | Fire protection to the steel frame is usually required by local code and must be priced in. |
| Fire and corrosion to the specIntumescent or cementitious fire protection and ISO 12944 coating systems applied to the rating and environment the design states. | Column grids are fixed at design stage; re-planning large openings later needs transfer structures. |
Certifications & Compliance
Every shipment leaves with the documents an auditor asks for. Scroll the row and open any certificate at full size.
China Steel Structure Manufacturing Grade I
AISC Certification
CE Marking – EN 1090-2 (CPR 01627)
OTC Document of Validity
International Welder Certification
Enterprise Qualifications Portfolio
DG Packaging Certificate
Labor & Scaffolding Contracting
Explosion-Proof Certificate
Industrial Pipeline Installation GC1
Power Facility License
Have drawings or a BOQ ready? Send them through the form and our engineers reply with a preliminary assessment.
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Detailed Engineering & Shop Drawing Development
Utilizing advanced BIM platforms such as Tekla Structures, detailed 3D modeling and shop drawings are executed strictly in compliance with AISC 360 or Eurocode 3 (EN 1993). Connection designs are rigorously verified, with manufacturing drawings generated to ISO 2768-m tolerance standards. 100% clash detection with primary architectural and MEP systems is performed to ensure zero structural conflicts during field erection.
Nesting & Material Optimization
Intelligent nesting layouts are performed using advanced software like FastCAM/SigmaNEST in accordance with EN 10029 / ASTM A6 dimensional standards. Accounting for cutting kerf (2mm-5mm depending on plate thickness) and thermal contraction allowances, raw material utilization exceeds 92%. Offcuts are digitally barcode-tracked to ensure 100% mill test report (MTR) traceability.
Raw Material Incoming Inspection
All structural steel (Q355B/C/D, ASTM A572 Gr.50, S355JR/J2) must be accompanied by EN 10204 3.1 Mill Test Reports (MTR). Incoming quality control conducts 100% dimensional and visual inspections under ASTM A6 / EN 10029, verifying thickness tolerances (Class A/B) and internal lamination integrity via Ultrasonic Testing (UT) to ASTM A435. Chemical composition and mechanical properties are spot-verified by accredited 3rd-party labs.
CNC Cutting & Edge Preparation
Plate profiling and component cutting are executed via CNC oxy-fuel, high-definition plasma, and multi-kW fiber laser equipment. Cut surface quality strictly complies with EN ISO 9013 for perpendicularity and surface roughness (Range 3/4 tolerance). Multi-axis CNC beveling machines execute weld prep bevel angles within ±2.5° and root face dimensions within ±1.0 mm.
Primary Structural Welding
Welding is performed exclusively by AWS D1.1 or EN ISO 9606 certified welders using qualified Welding Procedure Specifications (WPS) supported by Procedure Qualification Records (PQR) per AWS D1.1 / ISO 15614. Submerged Arc Welding (SAW) and Flux-Cored Arc Welding (FCAW) dominate Complete Joint Penetration (CJP) and fillet welds. Heat input is strictly controlled, achieving weld quality levels conforming to ISO 5817 Quality Level B or AWS D1.1 standards.
Weld Distortion Straightening
Post-weld angular distortion, camber, and sweep are rectified using automated hydraulic flange straighteners and controlled thermal flame straightening. Heating temperatures for High-Strength Low-Alloy (HSLA) steels are strictly maintained between 600-650 Celsius (air-cooled, zero water quenching) to prevent microstructural degradation. Post-straightening straightness tolerances meet ±3 mm, conforming to EN 1090-2 Execution Class 2 (EXC2) and AISC COSP standards.
Non-Destructive Testing (NDT)
NDT protocols are operated by ISO 9712 / ASNT Level II certified NDT personnel. 100% of critical Complete Joint Penetration (CJP) welds undergo Ultrasonic Testing (UT per ISO 17640 / ASTM E164) or Magnetic Particle Testing (MT per ISO 17638 / ASTM E709). Radiographic Testing (RT) is applied as requested for heavy sections. Weld acceptance conforms strictly to ISO 11666 Acceptance Level 1 or AWS D1.1 criteria.
Trial Assembly & Shop Alignment
Complex geometries, long-span trusses, and heavy framing undergo 1:1 physical trial assembly or high-precision 3D laser scanning virtual assembly per EN 1090-2 / AISC requirements. Bolt hole alignment is verified (≥95% free-pass rate for high-strength bolts), and critical dimensions (span, camber, 3D spatial alignment) are verified within tight tolerance limits (±2.0 mm) to eliminate site fitting risks.
Surface Preparation & Protective Coating
Structural members undergo automated shot blasting to achieve SSPC-SP10 / NACE No. 2 / ISO 8501-1 Sa 2.5 cleanliness, with a surface profile (anchor depth) of 45-75 microns. High-performance protective coatings are applied using airless spray technology in compliance with ISO 12944 (C3 to CX corrosive environments), featuring Zinc-Rich Epoxy Primers, Epoxy Micaceous Iron Oxide Intermediate coats, and Polyurethane/Fluorocarbon Topcoats. Dry Film Thickness (DFT) is verified adhering strictly to the 90/10 rule.
Final Quality Inspection & Certification
Final Quality Control (FQC) performs a comprehensive audit, inspecting paint aesthetics (zero runs, pinholes, sagging), critical geometry, bolt hole pitches, and component mark traceability. A complete Manufacturing Data Report (MDR) comprising MTRs, NDT records, coating inspection logs, and Certificates of Conformance is compiled to support CE Marking (DoP under EN 1090) and AISC final acceptance.
Export Packaging & Logistics Protection
Protective packaging is engineered for containerized (40HQ/OT/FR) and breakbulk ocean freight under heavy maritime transit conditions. Structural members are bundled on heavy-duty steel skids with high-tensile steel strapping. Machined connections are wrapped with VCI anti-corrosion film, EPE foam padding, and heavy rubber cushions. All timber packing complies fully with ISPM 15 phytosanitary standards and IMO Cargo Stowage and Securing (CSS) rules.
Global Field Erection & Site Management
We deliver international site erection supervision and turnkey EPCM construction services adhering to OSHA 1926 safety protocols, AISC COSP, and EN 1090-2 erection standards. Field teams, led by multilingual HSE and QA/QC engineers, utilize high-precision total stations to maintain structural plumbness within H/1000 (25mm max). High-Strength Structural Bolting is executed via calibrated Wrench or Turn-of-Nut methods with 100% torque audit documentation.
Frequently Asked Questions
Do you fabricate heavy box columns with internal diaphragms as well?
Yes. Internal diaphragms at beam-to-column levels are welded and inspected before the box is closed, and the closing welds are ultrasonically tested with the report issued per member. Send the connection details so the diaphragm positions are set at detailing rather than assumed.
What is your maximum single-member weight and section size?
It depends on the member geometry and the transport route rather than a single number. Tell us the heaviest member in your schedule and the destination port and we confirm whether it ships as one piece or is spliced.
Do you fabricate structural steel framing for high-rise buildings?
We fabricate the frame to your engineer’s design under EN 1090-2 EXC2; building height and fire rating are set by that design and the local code. Send the drawings and we confirm sections, weld classes and testing scope.
How are the beam connections prepared?
Bolt holes are drilled on CNC lines to the connection drawings and end plates or fin plates are welded in the shop, so the column arrives ready for bolted beam connections.
How is the column checked for plumb during erection?
Column plumbness is measured with total stations to H/1000, not exceeding 25 mm; high-strength bolts are tightened by the torque or turn-of-nut method with 100% torque audit records.
Can you supply this sub-system on its own, without the full frame?
Yes. We quote sub-systems separately where the scope makes sense — for example secondary framing or bracing against an existing structure. Send the BOQ and connection details of the receiving structure so the interfaces are engineered rather than assumed.
Which design code do you fabricate to?
Whichever your design specifies. Design intent to AISC 360 or Eurocode 3 (EN 1993), execution to EN 1090-2 EXC2 under certificate 2787-CPR-01627.
Do you substitute section sizes or grades?
Never without written approval. If a specified section has a long lead time we propose the alternative with the calculation showing equivalence, and you decide.
What documentation ships with these components?
Mill test certificates per heat, WPS/PQR, welder qualification certificates, NDT reports with technician level, and coating thickness records against the specified ISO 12944 system.
What is a realistic lead time?
The standard cycle for a single-building scope is 40 to 50 days: 1–2 weeks to shop drawings for your approval, then 4–5 weeks for procurement, fabrication, coating and loading.
Send Us Your Drawings or BOQ
Tell us the footprint, span, crane capacity and local loads — our engineering team reviews every request and replies with a preliminary assessment.
- Reviewed by our engineering team
- AISC certified · CE marked EN 1090-2 (EXC2)
- Mutual NDA available on request
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