Structural Steel Components
Structural Steel Components Manufacturer & Supplier | GNEE
GNEE produces structural steel members conforming to ASTM, EN 1090, and GB standards, including columns, beams, purlins, trusses, and bracing systems. All members undergo CNC plasma cutting, automatic submerged arc welding (SAW), shot blasting, and industrial coating processes, complying with our ISO 9001 quality management system.
Our steel columns and beams are CE-certified per EN 1090 and AISC-certified, meeting the requirements of European and North American markets. All welds conform to AWS D1.1 standards and are verified by ultrasonic testing (UT) and radiographic testing (RT) to ensure full weld penetration. Each shipment is accompanied by material test reports, galvanizing certificates, and non-destructive testing reports. Third-party inspection services by SGS, BV, or TUV are available upon request.
What Are Structural Steel Components?
Structural steel components are the individual prefabricated steel elements that form the load-bearing framework of steel buildings and infrastructure. These structural steel members fall into four functional categories:
Primary framing — steel columns and beams that carry gravity and lateral loads from floors, roofs, and cranes.
Secondary framing — cold-formed purlins and wall girts that support roofing sheets and cladding panels.
Truss systems — steel roof trusses and space frames that span large distances without intermediate columns.
Bracing systems — cross bracing, roof bracing, and tie bars that provide lateral stability against wind and seismic forces.
In modern construction, prefabricated steel components offer faster installation, precise factory tolerances, and full recyclability compared to cast-in-place concrete. Each component is engineered per project-specific load calculations and fabricated from structural steel grades such as Q355, ASTM A572 Gr50, or S355JR. Surface treatments—including hot-dip galvanizing, epoxy painting, and intumescent fireproof coatings—extend service life in corrosive, marine, or high-temperature environments.
Our Structural Steel Components Export Cases
GNEE has supplied structural steel components—including steel columns and beams, steel trusses, C and Z purlins, and bracing systems—to clients across 60+ countries in Europe, Southeast Asia, the Middle East, Africa, and South America. Our prefabricated steel components are widely used in industrial workshops, bridges, ports, power plants, and renewable energy projects worldwide.
Senegal Port Steel Structure Project
Year: 2021
Country: Senegal
Products: S355JR steel columns, welded box beams, and steel column bracing, EN 1090 standard, epoxy coating
Quantity: 120 tons
Bridge Infrastructure
Year: 2023
Country: Philippines
Products: ASTM A709 Gr50 steel box girders and cantilever girders, AWS D1.1 welded, CNC plasma cut
Quantity: 85 tons
Industrial Workshop
Year: 2024
Country: Uzbekistan
Products: Q355 H-section steel trusses, large-span roof truss, shot blasted and painted, GB standard
Quantity: 68 tons
Steel Warehouse Purlins Supply Project
Year: 2020
Country: Australia
Products: Z275 HDG C & Z purlins (C160–C240 / Z160–Z240) for roof & wall framing, pre-punched to AS/NZS (G450 cold-formed), Q355B portal frame columns & beams, Gr8.8 HDG bolts
Quantity: 22 tons
Solar Carport Steel Structure Project
Year: 2022
Country: Chile
Products: Q355B HDG portal columns, cantilever trusses, Q235B purlins, bracing & base plates, Gr8.8 HDG bolts
Quantity: 45 tons
Solar Barn Portal Frame Steel Structure Project
Year: 2026
Country: Brazil
Products: PHC300 pile-column portal frame, Q355B H200×100×5.5×8 HDG H-beam, Q235B C100×50×20×2.5 purlin, Gr8.8 bolts
Quantity: 43 tons
Featured Solution: Pile-Column Integrated Solar Barn Steel Structure
GNEE's independently developed pile-column integrated portal frame is a proven steel structure solution for livestock-solar complementary barns. By combining PHC precast concrete piles with hot-dip galvanized steel columns and H-section beams, this design eliminates separate concrete pile caps and reduces civil works costs by approximately 20% compared to traditional separated-foundation steel barns.
Structural Steel Components Used
| Component | Specification | Function |
|---|---|---|
| Portal frame main beam | H200×100×5.5×8 hot-dip galvanized H-section steel | Carries vertical PV loads and lateral wind pressure |
| Pile-top reinforced column | Φ114×3.0 hot-dip galvanized seamless round tube | Reinforces top 1m of PHC 300 precast pile |
| C purlins for PV mounting | C100×50×20×2.5 cold-formed galvanized C-section | Supports 700W+ bifacial double-glass PV panels |
| Bracing system | Horizontal and diagonal bracing, Grade 8.8 bolts | Provides lateral stability against crosswind |
Key Performance Data
| Metric | Our Design | Traditional Barn |
|---|---|---|
| Civil works cost | Reduced ~20% | High (double investment) |
| Steel consumption per unit area | 8.75 kg/m² | 11–14 kg/m² |
| Total steel per 1 MW | 40–45 tons | Higher |
| Clear span | 4–6m, full machinery access | Narrow column spacing |
| Wind resistance | Rigid portal joints, anti-overturning | Weak lateral stability |
All steel components—H-section beams, galvanized C purlins, bracing systems, and seamless round tube columns—are prefabricated in our facility per AWS D1.1 and ISO 3834-2 standards, hot-dip galvanized for long-term corrosion protection in high-humidity livestock and coastal environments, and shipped with MTR, NDT reports, and installation drawings. Unit area steel consumption of 8.75 kg/m² demonstrates optimized material use without compromising structural integrity.
Processing Equipment for Structural Steel Components
Every structural steel component we fabricate—from H-section columns and box beams to C purlins and steel trusses—is manufactured using precision CNC and automated welding equipment. Our production lines cover the full workflow: cutting, drilling, welding, surface treatment, and inspection.
| Equipment | Function | Applied To |
|---|---|---|
| 3.2m × 23m CNC Coordinate Cutting Machine | Precision flame/plasma cutting of large steel plates | Steel columns, beams, truss members |
| Gantry CNC Cutting Machine | Large-format CNC cutting with gantry structure | Heavy steel plates for box columns and girders |
| 25mm × 2500mm CNC Hydraulic Guillotine Shear | Shearing steel plates up to 25mm thickness | Connection plates, bracing members, gusset plates |
| Automatic Assembly Machine | Automatic alignment and tack assembly of steel sections before welding | H-beam assembly (flange-to-web), built-up sections |
| Gantry Multi-function Submerged Arc Welding (SAW) | Automated submerged arc welding for high deposition rates | Steel columns, beams, box girders |
| End Face Milling Machine | Milling flat surfaces on ends of steel sections | H-beams, box columns, end face preparation |
| Straightening Machine | Correcting deformation after welding or thermal cutting | Welded steel columns and beams |
| CNC Plate Drilling Machine | Precision drilling of flat steel plates | Connection plates, base plates, gusset plates |
| CNC Punching and Drilling Machine | Punching and drilling holes in steel members | Steel columns, beams, bracing members |
| Shot Blasting Machine | Surface cleaning by abrasive blasting | All structural steel components |
| Heavy-Duty Steel Structure Shot Blasting Machine | Surface cleaning of large hanging workpieces | Large welded assemblies, trusses, complex components |
| Paint Spray Booth | Controlled environment for applying protective coatings | All structural steel components |
Steel columns and beams are cut to exact dimensions by CNC coordinate cutting machines and gantry CNC cutting, sheared by CNC hydraulic guillotine, then assembled by automatic assembly machine and welded by gantry multi-function submerged arc welding (SAW). End face milling and straightening ensure dimensional accuracy. Connection holes are drilled by CNC plate drilling and punching machines. All structural steel components undergo shot blasting before painting in the spray booth. Design and detailing are handled in Tekla, AutoCAD, and STAAD Pro, enabling custom fabrication of structural steel components directly from client drawings.
Structural Steel Components Fabrication Process
Process 1 Welded Structural Steel Components
Applicable products : Steel columns and beams, steel trusses
|
Step |
Process |
Detail |
|
01 |
Confirm the Drawing |
Client drawings reviewed for steel columns, beams, and trusses; material grades (Q355, ASTM A572, S355JR) and dimensions verified |
|
02 |
Fabricate Drawing |
3D detailing and shop drawings generated in Tekla, converting structural steel component designs into fabrication-ready models |
|
03 |
CNC Cutting |
Steel plates and sections cut by CNC flame cutting and band saw for steel columns, beams, and truss members |
|
04 |
Assembling |
Steel columns, beams, and truss members positioned and fixture-assembled per Tekla models |
|
05 |
Gantry Automatic Welding |
Automated gantry submerged arc welding (SAW) on main welds of steel columns, beams, and box girders |
|
06 |
Straightening |
Flame and mechanical correction on welded steel columns and beams to maintain dimensional accuracy |
|
07 |
Parts Assembling & Welding |
Stiffeners, connection plates, and secondary members welded onto steel columns and beams per AWS D1.1 |
|
08 |
Ultrasonic Testing |
UT inspection on full-penetration welds of steel columns, beams, girders, and truss connections |
|
09 |
Shot Blasting |
Surface preparation to Sa2.5 for all welded structural steel components |
|
10 |
Painting |
Epoxy painting or hot-dip galvanizing (Z275-Z600) applied to steel columns, beams, and trusses |
|
11 |
Finished Products |
Steel columns, beams, and trusses labeled with project numbers, bundled by category, and stored |
|
12 |
Ready for Shipment |
Structural steel components loaded into containers with MTR, galvanizing certificates, and NDT reports |
Process 2 Cold-Formed Steel Purlins & Girts
Applicable products: Purlins and girts
|
Step |
Process |
|
1 |
Uncoiling & Leveling — steel coil uncoiled and leveled on automatic line |
|
2 |
Cold Roll Forming — C-section or Z-section formed by CNC roll-forming machine |
|
3 |
Pre-Punching — connection holes punched per drawings |
|
4 |
CNC Shearing — cut to exact length |
|
5 |
Surface Treatment — hot-dip galvanized (Z275) or pre-galvanized |
|
6 |
Inspection — dimensional check, thickness gauge, straightness verification |
Process 3 Machined & Welded Bracing Components
Applicable products: Bracing systems
|
Step |
Process |
|
1 |
Cutting — band saw or CNC cutting for angles, round bars, and tubes |
|
2 |
Drilling / Threading — connection holes drilled or threads machined for tie rods |
|
3 |
Welding / Bolting — welded or bolted connections per drawings |
|
4 |
Surface Treatment — hot-dip galvanized or painted |
|
5 |
Inspection — dimensional and thread verification |
Quality Control
Every batch of structural steel components—steel columns, beams, purlins, trusses, and bracing systems—is verified through four inspection stages: impact testing, weld inspection, dimensional verification, and load testing. All testing is performed per AWS D1.1, ASTM, and ISO standards, with results documented in material test reports and NDT reports provided with each shipment.
Material Testing
| Test | Method | Standard |
|---|---|---|
| Chemical Composition | Spectrometer | ASTM A751, GB/T 4336 |
| Tensile Strength | Universal Testing Machine | ASTM A370, EN 6892 |
| Yield Strength | Universal Testing Machine | ASTM A370, EN 6892 |
| Elongation | Universal Testing Machine | ASTM A370 |
| Impact Toughness | Charpy V-notch Test | ASTM A370, EN 10045 |
Welding Inspection
| Test | Method | Standard |
|---|---|---|
| Visual Inspection | 100% full weld | AWS D1.1, ISO 17637 |
| Ultrasonic Testing (UT) | Ultrasonic flaw detector | ASTM E164, EN 17640 |
| Radiographic Testing (RT) | X-ray /gamma ray | ASTM E94, EN 17636 |
| Magnetic Particle Testing (MT) | Magnetic particle inspection | ASTM E709, EN 17638 |
| Weld Dimension | Weld gauge | AWS D1.1 |
Dimensional Inspection
| Test | Method | Standard |
|---|---|---|
| Length & Width | Steel tape, caliper | Per drawings |
| Thickness | Micrometer, UT thickness gauge | ASTM E797 |
| Straightness | Straightedge, laser | GB/T 50205 |
| Angle | Bevel protractor | Per drawings |
| Twist | Measurement frame | GB/T 50205 |
Surface Treatment Inspection
| Test | Method | Standard |
|---|---|---|
| Surface Preparation | Visual comparison | ISO 8501-1 (Sa2.5) |
| Coating Thickness | Coating thickness gauge | ASTM D7091, ISO 19840 |
| Galvanizing Thickness | Coating thickness gauge | ASTM A123, EN ISO 1461 |
| Galvanizing Adhesion | Adhesion test | ASTM A123 |
| Fireproof Coating Thickness | Thickness gauge | EN 13381 |
Professional Packaging & Shipping
All structural steel components are fabricated to order, packaged by category per project drawings, and shipped with complete documentation to ensure smooth customs clearance and on-site installation.
Packaging & Shipping
|
Component Type |
Packaging Method |
Protection |
Container / Vehicle |
|
Steel columns and beams |
Steel pallets or bundled with steel straps, separated by wooden blocks |
Surface protected with plastic film; galvanized surfaces wrapped to prevent white rust |
40HQ container or 40ft flat rack |
|
Steel trusses |
Steel frame supports for long-span members; bundle-wrapped with plastic film |
Node plates and connection holes protected with plastic caps |
40HQ container, flat rack, or bulk vessel |
|
C and Z purlins |
Bundled by size and length, tied with 4-point steel straps |
Pre-punched holes protected; ends capped with plastic protectors |
20GP or 40HQ container |
|
Bracing systems |
Small parts (sag rods, bolts) bagged and labeled; long members bundled with straps |
Threaded ends protected with plastic caps; galvanized surfaces wrapped |
20GP or 40HQ container |
Note:Each bundle is labeled with: project number, component ID, material grade, quantity, and destination marking per client requirements.
Lead Time
|
Component Type |
Standard Lead Time |
Complex / Custom Lead Time |
|
Steel columns and beams |
25–35 days |
40–60 days (box columns, crane girders) |
|
Steel trusses |
30–40 days |
45–70 days (space trusses, large-span trusses) |
|
C and Z purlins |
15–25 days |
25–35 days (custom sizes, special coatings) |
|
Bracing systems |
20–30 days |
30–45 days (custom threading, hot-dip galvanizing) |
Note:Lead time is calculated from drawing confirmation and deposit receipt. Rush production is available upon request.
Shipping Terms & Documentation
|
Item |
Detail |
|
Incoterms |
FOB (Tianjin), CIF, DDP |
|
Shipping Methods |
Container (20GP/40HQ), flat rack, bulk vessel |
|
Export Documentation |
Commercial invoice, packing list, bill of lading, CO (Certificate of Origin) |
|
Quality Documentation |
MTR (Material Test Report), galvanizing certificate, NDT report, welding procedure qualification (WPQR) |
|
Customs Clearance |
Full export documentation provided; third-party inspection by SGS, BV, or TUV supported |
Value-Added Services
|
Service |
Description |
|
Free Design Optimization |
Tekla and STAAD Pro design optimization, reducing material weight by 5–15% while maintaining load capacity |
|
Drawing Conversion |
Convert architectural concepts into Tekla fabrication-ready shop drawings for steel columns, beams, trusses, purlins, and bracing systems |
|
Weekly Progress Reports |
Production photos and milestone reports via email showing cutting, welding, and packaging status |
|
Pre-Shipment Video Inspection |
Video inspection of finished structural steel components for overseas clients who cannot visit in person |
|
Expedited Production |
Dedicated production line; lead time reduced by 30–40% for urgent steel columns, beams, and trusses |
|
Container Loading Supervision |
Photos and videos of bundling, bracing, and sealing before departure |
|
Installation Guidance |
Installation drawings, bolt lists, and assembly sequences provided; remote video support for on-site assembly |
FAQ
Q: What steel grades are available for structural steel components?
A: We fabricate structural steel components from Q235, Q355, Q390 (Chinese standard), ASTM A36, A572 Gr50 (American standard), and S355JR (European standard). Weathering steel (Corten) and galvanized steel are available for corrosive or marine environments. Material selection depends on your project's load requirements, design code, and environmental exposure.
Q: Can you fabricate steel columns and beams according to our drawings?
A: Yes. We provide custom structural steel fabrication per your Tekla or CAD drawings. Our in-house engineers convert your drawings into fabrication-ready shop drawings, with steel columns, beams, trusses, purlins, and bracing systems manufactured to exact dimensions and connection details.
Q: How do you ensure welding quality of steel columns and beams?
A: All welders hold AWS D1.1 certification. We use automated submerged arc welding (SAW) and electroslag welding (ESW) for main welds of steel columns and beams. Full-penetration welds undergo 100% visual inspection plus ultrasonic testing (UT) and radiographic testing (RT). Our welding quality system complies with ISO 3834-2 with complete WPQR records.
Q: What surface treatments are available for structural steel components?
A: Options include hot-dip galvanizing (Z275–Z600), epoxy painting, and intumescent fireproof coating. For steel columns and beams in high-rise buildings, fireproof coating is applied to meet fire rating requirements. For purlins and bracing systems in corrosive environments, hot-dip galvanizing is recommended.
Q: What standards do your structural steel components comply with?
A: We fabricate per ASTM, EN 1090, GB, JIS, and BS standards. Our facility holds ISO 9001, CE (EN 1090 EXC3), and AISC certifications. This means our structural steel components are qualified for European, North American, and Asia-Pacific construction markets.
Q: What is the minimum order quantity for structural steel components?
A: No strict MOQ. We accept both small trial orders and large project volumes. For sample verification, small pieces of steel columns, beams, or purlins can be shipped by DHL or FedEx before bulk order confirmation.
Q: What documents are provided with each shipment?
A: Every shipment includes commercial invoice, packing list, bill of lading, Certificate of Origin (CO), Material Test Report (MTR), galvanizing certificate, NDT report, and WPQR. Third-party inspection reports by SGS, BV, or TUV are available upon request.
Q: Can you ship structural steel components to our construction site?
A: Yes. We offer FOB (Tianjin), CIF, and DDP terms. Under DDP, we handle customs clearance, import duties, and last-mile delivery to your site. Partial shipment is supported to align with your construction schedule, with free storage at our facility for up to 30 days.
Q: Do you provide installation support for structural steel components?
A: Yes. Detailed installation drawings, bolt lists, and assembly sequences are provided with each shipment. Remote video technical support is available for on-site assembly of steel columns, beams, and trusses. If a component doesn't fit on site, replacement or modified parts are shipped within 15 days.
As one of the most professional structural steel components manufacturers and suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please rest assured to buy customized structural steel components at competitive price from our factory. For quotation, contact us now.