Audited Supplier
Core Competitiveness
1. Robust Infrastructure, Capacity Guaranteed
Capital & Scale: Registered capital of 10 million RMB, two modern manufacturing workshops spanning 50,000 square meters, and an annual production capacity exceeding 50,000 tons.
Advanced Equipment: Equipped with laser cutting machines, CNC planar drilling machines, H-beam welding-straightening integrated systems (max. cross-section depth: 1,800mm), gantry box girder welding machines, and other precision tools to tackle complex processing demands.
Leading Cold Bending Technology: H-beam cold bending with a maximum cross-section depth of 400mm, enabling customized solutions for intricate structures.
2. Technology-Driven Innovation
Expert Team: Our technical center includes 18 structural design and detailing specialists, supported by over 200 skilled technicians.
Certifications & Achievements: Holds the Grade II Steel Structure Engineering Contracting Qualification issued by China's Ministry of Housing and Urban-Rural Development, along with multiple patents and innovations in construction techniques and material R&D.
Process Excellence: Continuously refine manufacturing processes and advance technological innovation in steel structure production.
Intelligent manufacturing syste:Equipped with domestic leading automatic production lines (such as CNC cutting, alignment correction, robot welding, etc.), combined with BIM modeling technology to optimize the design, to ensure the accuracy of components up to millimeter, improve the construction efficiency of more than 30%.
3. Global Compliance, Quality Assurance
International Certifications: Compliant with ISO 9001 (Quality), ISO 14001 (Environment), and ISO 45001 (Safety) standards, and certified by AISC (U.S.) and CE (EN), ensuring global regulatory adherence.
End-to-End Quality Control: Rigorous quality management from raw material sourcing to final delivery, guaranteeing project safety and durability.
4. Resource integration and delivery capability
Supply chain advantage: Relying on Shandong iron and steel industry cluster, we establish strategic cooperation with raw material suppliers and logistics enterprises to achieve rapid inventory and cost optimization, and shorten the delivery cycle by 10-15 days compared with the industry average.
EPC service capability: Provide integrated design, procurement and construction services, equipped with a professional installation team and project management system to ensure efficient landing of complex projects.
1. Material Parameters
Steel Grades
Common grades: Q235, Q345, Q390, Q420 (Chinese standards); ASTM A36, A572 (U.S. standards); S235, S355 (European standards).
Strength grades: Tensile strength ≥375-550 MPa, yield strength ≥235-420 MPa (varies by grade).
Section Steel Types
Hot-rolled H-sections, square/rectangular tubes, circular tubes, I-beams, box columns.
Cold-formed thin-walled sections (for secondary components).
Auxiliary Materials
High-strength bolts: Grade 8.8, 10.9 .
Welding materials: Electrodes/wires compatible with base metal .
Fireproof coatings: Intumescent (1-3 mm thickness) or cementitious (10-40 mm thickness).
2. Structural Component Parameters
Columns (Vertical Load-Bearing Members)
Cross-sectional dimensions: H-sections range from H200×200×8×12 to H500×500×20×30 (mm).
Box columns: 400×400×16 to 800×800×30 ,wall thickness 16-40 mm.
Slenderness ratio control: λ ≤ 80 ,stricter for seismic design.
Beams (Horizontal Load-Bearing Members)
Cross-sectional types: H-sections, I-beams .
Span: 6-12 m .
Depth-to-span ratio: 1/15-1/25 .
Floor Systems
Composite deck slabs: Profiled steel sheet (0.8-1.5 mm) + concrete (100-150 mm).
Steel bar truss deck slabs: Span 3-6 m, suitable for large spaces.
Bracing Systems
Types: Concentric braces (X/V-shaped), eccentric braces (preferred for seismic resistance).
Sections: Angle steel , H-sections , or circular tubes.
3. Connection Parameters
Beam-Column Joints
Rigid connections: Fully welded or bolted-welded hybrid (flange welded, web bolted).
Hinged connections: Web bolted only.
Seismic joints: Follow "strong joint, weak component" principle (e.g., stiffener plates).
Column Bases
Embedded base: Depth ≥1.5× column section height in concrete foundation.
Encased base: Encasing concrete height ≥2× column section height.
Bolted Connections
Friction-type high-strength bolts: Preload-controlled .
Bolt spacing: ≥3× bolt diameter; edge distance ≥1.5× diameter.
4. Design Parameters
Load Parameters
Seismic fortification intensity: 6-9 degrees .
Wind load: Basic wind pressure 0.3-0.7 kN/m² .
Live load: 2.0-5.0 kN/m² .
Structural Performance Requirements
Inter-story drift limit: 1/250 , 1/50 .
Natural vibration period: Generally ≤0.1N (N = number of stories).
Corrosion & Fire Protection
Anti-corrosion: Hot-dip galvanizing or epoxy zinc-rich primer .
Fire resistance: 1-3 hours .
5. Fabrication & Installation Parameters
Fabrication Tolerance
Component length: ±2 mm/6 m.
Bolt hole spacing: ±1.5 mm.
Installation Requirements
Verticality deviation: ≤H/1000 and ≤25 mm (total height).
Weld quality: Grade I (full penetration) or Grade II (partial penetration).
6. Applications
Building Types: Offices, hotels, apartments, commercial complexes.
Typical Height: 6-40 stories (20-150 m).
Economic Spans: 6-12 m (main beams), 3-6 m (secondary beams).
1. Product Overview
The multi-story steel frame is a structural system primarily composed of steel load-bearing components, widely used in mid- to high-rise buildings (6-40 floors, 20-150 meters in height) such as office towers, hotels, commercial complexes, and apartments. Its core structure consists of steel columns, beams, bracing systems, and composite floor slabs, connected by high-strength bolts or welding to form a rigid spatial framework. Known for its lightweight yet high-strength properties, rapid construction, and excellent seismic performance, it represents a modern industrialized building solution.
2. Key Structural Features
High Load-Bearing Efficiency
Material Performance: Utilizes high-strength steel grades like Q345B and Q420, with yield strengths of 345-420 MPa and tensile strengths ≥470-550 MPa, reducing component cross-sections and maximizing spatial efficiency.
Component Design: Standardized H-sections, box columns, and tubular members optimize stress distribution, supporting large spans (6-12 m) and high live loads (2.0-5.0 kN/m²).
Superior Seismic Performance
Ductile Design: Follows the "strong column-weak beam" and "strong joint-weak component" principles, incorporating eccentric braces (EBF) or buckling-restrained braces (BRB) to dissipate seismic energy, limiting inter-story drift to ≤1/250.
Joint Reinforcement: Beam-column joints are reinforced with stiffeners or reduced beam section (RBS) techniques to ensure safety under extreme loads.
Rapid Construction
Prefabrication: Factory-produced standardized components with precision tolerances (±2 mm/6 m), reducing on-site work and shortening project timelines by 30%-50%.
Modular Assembly: Combines high-strength bolting and welding for efficient installation, achieving 1-2 floors per day.
Sustainability
Recyclability: Over 90% steel recyclability, minimizing construction waste and aligning with circular economy principles.
Energy Efficiency: Composite floor slabs and lightweight enclosures reduce overall building energy consumption.
3. Core Components & Systems
| Component | Description |
|---|---|
| Steel Columns | Box-section or H-section columns (400×400 to 800×800 mm, wall thickness 16-30 mm), slenderness ratio ≤80 for stability. |
| Steel Beams | H-section beams (depth 400-600 mm, depth-to-span ratio 1/15-1/25), integrated with floors for composite action. |
| Floor System | Profiled steel sheet-concrete composite slabs (100-150 mm thick) or steel bar truss decks (span 3-6 m). |
| Bracing System | X/V-type concentric braces (angle/H-sections) or seismic-resistant eccentric braces to enhance lateral stiffness. |
| Fire & Corrosion Protection | Epoxy zinc-rich primer (60-100 μm) + fireproof coatings (1-3 hours fire resistance limit), compliant with GB 14907. |
4. Technical Advantages
Cost-Effectiveness: Steel consumption 35-60 kg/m², with lower overall costs vs. concrete structures (especially for time-sensitive projects).
Design Flexibility: Column-free large spans adapt to diverse layouts for commercial or office spaces.
Quality Assurance: Full BIM integration ensures precision and minimizes human error.
5. Typical Applications
Commercial: Shopping malls, office buildings (large spans, flexible layouts).
Public Facilities: Hospitals, schools,transportation hubs (fast-track construction with minimal disruption).
Residential: Luxury apartments, residential buildings, hotels (enhanced usable area and comfort).
Industrial: Warehouses, factories,industrial pipe racks (heavy loads, large spaces).
6. Integrated Services
Custom Design: Seismic/wind resistance optimization and steel quantity analysis.
Turnkey Solutions: EPC services covering design, fabrication, installation, and fire/corrosion protection.
Certifications: Compliant with GB 50017 (Steel Design Code) and ISO 9001.
7. Case Studies (Examples)
CBD Super High-Rise Office Tower: 40 floors, 160 m height, using box columns + BRBs, 40% faster completion.
Large Convention Center: 45 m span steel frame with cable-stayed beams for column-free exhibition space.
I. Shipping packaging specifications
Strapping and securing:
H-shaped steel main components are bound with galvanized steel strips (width ≥32mm), spacing ≤1.5m, and EPE buffer pads are added to contact points.
Ultra-long components (≥12m) are fixed by "well" shaped steel frame to avoid shipping turbulence and deformation .
Suitable container:
Standard parts: 40ft high cabinet (HC container, inner size 11.9×2.35×2.69m), the distance between components and box wall ≥10cm and filled with air bags for anti-collision.
Special-shaped parts: open top container (OT) or flat box (FR), the top covered with rainproof canvas and bundled reinforcement.
Identification and documentation:
International common identification:The "↑" direction arrow, "Keep Dry" and "Fragile" ICONS are printed on the outside of the package (in accordance with GHS standards).
A UN number (such as UN 1356 for steel) and an IMO cargo category label are affixed to both sides of the container.
Documents included with the box:
Attached are packing list (including component number, net weight/gross weight, HS code), material certificate (EN 10025), anticorrosion test report.
1. Shipping Mode Options
| Cargo Type | Recommended Solution | Advantages |
|---|---|---|
| Full Container (FCL) | Ship ≥20 tons per batch in dedicated containers | Minimizes damage, faster customs clearance |
| LCL Consolidation | Combine smaller loads (<20 tons) with other cargo | Reduces costs |
| Oversized Cargo | Use deck barges for components >30m span | Handles special dimensions, GPS tracking |
2. Route & Handling Requirements
Preferred Ports:
Departure: Qingdao Port (proximity to production base, heavy-lift terminals).
Destination: Confirm port lifting capacity .
Handling Protocols:
Use nylon slings (no direct steel cable contact) for container loading/unloading, following marked lift points.
Oversized cargo requires on-site marine engineers; operations permitted at wave heights ≤1m.
