What a Steel Structure Manufacturer Delivers to Global Buyers
When international buyers search for a steel structure manufacturer, they are looking for a factory that designs, fabricates, and ships complete steel structure systems—columns, beams, trusses, bracing, cladding, and all connection hardware—ready for bolted assembly at the project site. Jidian Construction Materials Co., Ltd. is a steel structure manufacturer based in Xiamen, Fujian, China, with 360,000 tons of annual steel capacity and 1,000,000 m² of annual enclosure system output. The company participated in the formulation and review of China's national steel structure standards, holds the highest Steel Structure Manufacturing Special Level Qualification, and has delivered 2,000+ completed projects across 50+ countries. Products include portal frame workshops, multi-span industrial buildings, crane-ready structures, warehouses, commercial buildings, aircraft hangars, bridges, and agricultural buildings—all custom-engineered to the buyer's specifications and local design code.
Core Products: Steel Structure Building Systems
Jidian manufactures steel structure systems for diverse applications. The core product range includes:
| Product | Structure Type | Span Range | Crane Capacity |
|---|---|---|---|
| Portal frame workshop | H-section portal frame | 15–36m | 5–32t |
| Multi-span workshop | Multi-bay portal frame | 2–5 bays × 15–36m | 5–32t per bay |
| Crane workshop | Heavy portal frame | 15–36m | Up to 32t |
| Portal frame warehouse | H-section portal frame | 15–36m | 5–20t |
| Light steel warehouse | Cold-formed C/Z | 12–24m | Not standard |
| Aircraft hangar | Portal + truss hybrid | 40–80m | 10–50t |
Each product uses Q345B/Q355B welded H-section steel for primary members, hot-dip galvanized to ≥275g/m² per ISO 1461. Enclosure systems include rock wool sandwich panels (fire resistance ≥2hr), PU/EPS insulated panels, and corrugated galvanized steel.
Manufacturing Infrastructure and Equipment
Steel structure manufacturing quality depends on equipment precision and process control. Jidian's facility operates production lines imported from Germany, Italy, and Japan:
- Cross-column production line: Assembles and welds H-section columns and beams using automated submerged-arc welding (SAW). Produces sections up to 1,500mm web height with consistent full-penetration welds.
- European longitudinal box production line: Fabricates welded box columns for multi-story buildings and heavy-load structures. German and Italian engineering.
- CNC plasma cutting: Precision plate preparation with ±1mm cut accuracy for connection plates, base plates, and stiffeners.
- AMADA secondary processing line: Japanese CNC drilling and milling for ±2mm bolt-hole positioning. Components align during bolted assembly without field reaming or shimming.
- Surface preparation: Shot blasting to Sa 2.5 grade (ISO 8501-1) before hot-dip galvanizing or multi-coat painting.
With 360,000 tons annual capacity, Jidian can produce multiple building sets simultaneously. Batch production of identical buildings reduces per-unit cost through steel volume pricing and amortized setup.
Steel Grades, Material Selection, and Traceability
The steel grade determines structural performance and weldability. Jidian primarily uses Q345B/Q355B (yield strength 345–355 MPa per GB/T 1591) for primary columns and beams, and Q235B (235 MPa per GB/T 700) for secondary members, bracing, and purlins. For bridge projects, Q345qC/Q370qC bridge steel per GB/T 714 provides guaranteed Charpy V-notch impact energy at -20°C for cold-region applications.
Every steel batch arrives with mill certificates documenting chemical composition, mechanical properties, and impact test results. These certificates become part of the material traceability dossier shipped with every order. No material substitution is permitted—Q235B cannot replace specified Q345B/Q355B without engineering approval and documentation.
Welding Qualifications and Quality Control
Welding is the critical process in steel structure manufacturing. Jidian's welding procedures are qualified to ISO 15614-1, and all welders carry ISO 9606 certifications. The quality control protocol includes:
- 100% ultrasonic testing (UT) on all full-penetration butt welds of primary load-bearing members, per GB/T 11345
- 10–20% radiographic testing (RT) spot checks on critical butt welds
- Magnetic particle inspection (MT) on all fillet welds at fatigue-critical details
- Visual and dimensional inspection on every weld and component
- Coating thickness verification on all galvanized or painted components
Jidian holds the China Steel Structure Manufacturing Special Level Qualification—the highest grade—and the Italy Welding Procedure Qualification Certificate for CE-marked components per EN 1090. Products carry ISO 9001, CE, SGS, and BV certifications.
Design Engineering and Code Compliance
As a steel structure manufacturer, Jidian provides full design engineering services. Structures are engineered to the design code applicable to the project location:
- Chinese GB 50009/50017: Load codes and steel structure design. Standard for domestic and Belt and Road projects.
- AASHTO LRFD: Load and Resistance Factor Design. US and international bridge projects.
- Eurocode EN 1991/1993: Actions on structures and steel design. EU and international projects.
- British Standards BS 5400: Steel bridges. Commonwealth countries.
Jidian's engineering team provides stamped structural calculation reports, 3D models, shop drawings, and material specifications compliant with your local building code—free of charge before production. Standard design parameters include wind load 0.5–0.6 kN/m² (≈120–140 km/h), snow load 0.5 kN/m², and seismic intensity Grade 8. All parameters are upgradable based on your local data.
Enclosure Systems and Building Completeness
A steel structure manufacturer delivers not just the frame but the complete building envelope. Jidian produces 1,000,000 m² of enclosure systems annually:
- Rock wool sandwich panels (100–150mm): Fire resistance ≥2 hours per fire codes. Used for workshops, warehouses, and hangars.
- PU/EPS insulated panels (50–100mm): Thermal insulation for agricultural and commercial buildings. Reduces temperature fluctuation by 8–12°C.
- Corrugated galvanized steel: Economical roofing and cladding for agricultural buildings.
- Composite floor decks: Steel deck with concrete topping for multi-story buildings. Live load up to 5 kN/m².
The enclosure system is coordinated with the structural frame—panel connections, door and window openings, and ventilation penetrations are pre-engineered into the design.
Shipping, Packaging, and Documentation
Steel structure components are engineered for efficient container shipping. Components fit standard 40ft container dimensions (12m × 2.35m × 2.39m) where possible. Steel components are bundled with steel straps and fabric-wrapped. Small parts go in iron boxes labeled with part numbers. Standard shipments use 40ft OT or HQ containers from Xiamen port. A standard 1,000 m² workshop typically requires 3–5 containers.
Each shipment includes a complete documentation dossier: mill certificates, weld maps, NDT reports (UT/RT/MT), coating thickness records, shop drawings, structural calculation reports, and assembly drawings. These documents support building permit applications and authority approvals at your destination.
Installation Support and After-Sales Service
Jidian provides comprehensive installation support for steel structure projects:
- Assembly drawings: Detailed drawings showing component positions, bolt schedules, and connection sequences.
- Connection sequence videos: Step-by-step video guides for erection crews.
- On-site engineer supervision: For structures above 2,000 m², qualified engineers supervise erection and final inspection.
- Remote support: Phone and video consultation for all projects.
- After-sales service: 24-hour customer service team. 2-year workmanship warranty. Ongoing structural consultation.
A standard 1,000 m² portal frame workshop erects in 25–30 days with a 6–8 person crew. Modular bay spacing (6–9m) allows future building extension by bolting on additional bays.
Common Risks When Sourcing Steel Structures
- Incomplete building systems: Some suppliers ship only the steel frame, omitting enclosure panels, fasteners, or flashings. Confirm the quotation includes all components for a complete building.
- Inadequate welding documentation: Building permits require NDT reports and weld maps. Confirm 100% UT coverage and complete documentation with every shipment.
- Tolerance failures: Poor fabrication tolerance causes assembly problems. Verify ±2mm tolerance and CNC drilling capability.
- Corrosion protection mismatch: Painted steel without galvanizing may fail in corrosive environments. Verify ≥275g/m² galvanizing per ISO 1461.
- Design code non-compliance: Structures designed to one code may not meet another jurisdiction's requirements. Specify your governing code upfront.
FAQ
Q: What types of steel structures do you manufacture?
A: Portal frame workshops (15–36m span), multi-span industrial buildings, crane-ready workshops (5–32t), warehouses, commercial buildings, aircraft hangars (40–80m span), bridges, and agricultural buildings. 2,000+ projects across 50+ countries.
Q: What is your annual production capacity?
A: 360,000 tons of steel structures and 1,000,000 m² of enclosure systems per year, backed by China's highest Steel Structure Manufacturing Special Level Qualification.
Q: What steel grades do you use?
A: Q345B/Q355B welded H-section for primary members, Q235B for secondary members, Q345qC/Q370qC bridge steel for bridge projects. Mill certificates document every batch.
Q: What welding and NDT standards do you follow?
A: ISO 15614-1 welding procedures, ISO 9606 welder certifications. 100% UT on full-penetration butt welds per GB/T 11345, 10–20% RT spot checks, MT on fillet welds.
Q: Do you provide design and structural calculations?
A: Yes. Stamped structural calculation reports, 3D models, and assembly drawings compliant with GB, AASHTO, Eurocode, or BS—free of charge before production.
Q: What is included in a steel structure shipment?
A: Complete steel frame, enclosure panels, fasteners, connection plates, flashings, assembly drawings, and full documentation dossier (mill certs, weld maps, NDT reports, coating records).
Q: What is the typical delivery time?
A: 25–45 days from drawing sign-off depending on complexity. Shipping from Xiamen port depends on destination.
Q: Do you provide installation supervision?
A: Yes. On-site engineers for structures above 2,000 m². Assembly drawings, connection videos, and remote support for all projects.
Q: Can buildings be expanded later?
A: Yes. Modular bay spacing (6–9m) allows future extension by bolting on additional bays without modifying the existing structure.
Q: What payment terms do you accept?
A: T/T (30% deposit, 70% before shipment) or L/C at sight. Alibaba Trade Assurance supported.
