Our Products
Pre-engineered portal steel frames, welded H-beams, galvanized C/Z purlins and turnkey cladding packages for industrial warehouses and workshops.
Product Manufacturer
Shanghai ZhuAi Building Material Co., Ltd. fabricates and exports pre-engineered steel structure buildings and custom structural steel components for logistics warehouses, manufacturing workshops, cold storage facilities and commercial buildings. Our scope covers primary welded/hot-rolled H-beams and columns, secondary galvanized C/Z purlins, bracing systems, and high-strength bolt packages.
Unlike standalone steel fabricators, ZhuAi manufactures both the structural steel frame and the complete building envelope—including insulated sandwich panels, steel roofing sheets, and composite floor decking—ensuring seamless dimensional coordination for contractors in the United States, Australia, and worldwide.
Request a QuoteProduct Range
Order a complete pre-engineered building kit or source individual primary and secondary structural steel members fabricated to your shop drawings.
Clear-span and multi-span rigid portal frames fabricated from high-tensile Q355B / ASTM A572 Gr.50 welded or hot-rolled H-section steel.
Pre-punched cold-formed galvanized C and Z purlins, wall girts, tie rods and cross-bracing engineered to carry roof and wall cladding loads.
Build-to-print structural steel columns, box beams, equipment platforms, pipe racks and multi-story mezzanine frames.
Technical Data
Engineering standards for ZhuAi prefabricated steel buildings—including structural steel grades, international equivalents, anti-corrosion coating systems and building design parameters.
| Structural Member | Section / Profile Type | Standard Steel Grade | US / AU / EU Equivalent | Manufacturing & QC Standard |
|---|---|---|---|---|
| Primary Columns & Rafters | Welded or Hot-Rolled H-Section, Box Column | Q355B (Min. Yield 355 MPa) | ASTM A572 Gr.50 · AS 3678 Gr.350 · S355JR | Submerged arc welding; 100% UT flaw detection on full-penetration welds |
| Crane Beams & Mezzanine Beams | Welded H-Beam with stiffener plates | Q355B / Q355C | ASTM A572 Gr.50 / A992 · S355J0 | Pre-cambered fabrication; shear stud welding ready |
| Roof Purlins & Wall Girts | Cold-Formed C-Section or Overlapping Z-Section | Q235B / Q355B Galvanized | ASTM A653 Gr.33/50 · AS 1397 G300/G450 | Thickness 1.5–3.0 mm; Z180–Z275 g/m² zinc coating; CNC pre-punched |
| Tie Tubes & Bracing | Circular Hollow Section (CHS), Angle Steel, Rod | Q235B | ASTM A36 / A500 · AS 1163 C250 · S235JR | Painted or hot-dip galvanized with forged turnbuckles |
| High-Strength Structural Bolts | Hexagon Heavy Structural Bolts + Nuts + Washers | Grade 10.9S / Grade 8.8S | ASTM A325 / A490 · AS/NZS 1252 | Dacromet or hot-dip galvanized finish with torque test certificates |
| Foundation Anchor Bolts | J-Bolts / L-Bolts with leveling nuts & templates | Q235B / Q355B (M20–M36) | ASTM F1554 Gr.36 / Gr.55 | Supplied with steel positioning template plates for accurate pouring |
All raw steel plates and coils are sourced from tier-one mills (such as Baosteel, Shagang, and Rizhao Steel) with traceable EN 10204 3.1 Mill Test Certificates.
| Coating System | Surface Prep | Primer & Intermediate Coat | Topcoat / Finish | Total DFT / Thickness | Recommended Environment |
|---|---|---|---|---|---|
| Option 1: Standard Alkyd System | Shot Blasting Sa 2.5 | 2 coats Red Oxide / Grey Alkyd Primer (70 μm) | 1–2 coats Alkyd Enamel Topcoat (50 μm) | 110 – 130 μm | Dry inland warehouses & enclosed workshops (C2) |
| Option 2: Heavy Industrial Epoxy | Shot Blasting Sa 2.5 | Epoxy Zinc-Rich Primer (60 μm) + Epoxy MIO (80 μm) | 2-Pack Polyurethane Topcoat (60 μm) | 180 – 220 μm | Humid, industrial & coastal buildings in US/AU (C3–C4) |
| Option 3: Hot-Dip Galvanized (HDG) | Acid Pickling + Flux | Full immersion in molten zinc bath (ASTM A123 / AS 4680) | Natural zinc passivated finish | 65 – 85 μm (500–600 g/m²) | Coastal, marine, agricultural & high-corrosion plants (C4–C5) |
High-strength friction-grip (HSFG) bolt contact surfaces at column-to-rafter splices are shot-blasted and masked during painting to maintain required slip factor.
| Clear Span Width | 12 m – 36 m single clear span · Up to 60 m+ with internal multi-span modular columns |
|---|---|
| Eave Height & Bay Spacing | Standard eave height 4.5 m – 15.0 m · Typical portal frame bay spacing 6.0 m, 7.5 m, or 8.0 m |
| Roof Pitch | 1:10 (5.7°) to 1:20 (2.8°) standard portal roof slope; steeper pitches available on request |
| Design Wind & Snow Loads | Engineered to project wind speed (up to 160–240 km/h cyclonic zones), snow load (0.5–1.5 kN/m²) & seismic zone |
| Wall & Roof Cladding Options | Single-skin 0.42–0.60 mm steel sheets OR 50–150 mm PU/PIR, Rock Wool & EPS insulated sandwich panels |
| Container Shipping Method | Max piece length ≤ 11.8 m · Loaded on heavy-duty sliding steel cradles inside 40HQ or 40OT containers (approx. 22–26 tons/40HQ) |
Every H-beam, column, gusset plate and purlin is hard-stamped and stenciled with its exact Tekla 3D part number (e.g., GKZ-1, GKL-2) so your erection crew can sort and bolt members rapidly on site.
Instead of loose loading that damages paint and risks worker injury, we load heavy H-beams onto wheeled steel skid frames inside 40HQ containers for 30-minute forklift unloading.
Send us your structural drawings or basic building dimensions (Length × Width × Eave Height + Location). We provide a detailed steel tonnage takeoff and FOB/CIF quote.
Get Steel Tonnage QuoteProduct Advantages
Procure primary steel framing, C/Z purlins, sandwich panels, roofing sheets and floor decking from a single Shanghai manufacturer.
Precision CNC plasma cutting, automated submerged-arc welding and Tekla 3D shop modeling ensure accurate bolt-hole alignment on site.
Engineered splice joints under 11.8 m and roll-out steel pallets protect epoxy coatings and slash unloading labor at US and Australian sites.
Certified Q355B / ASTM A572 Gr.50 steel, Sa 2.5 shot-blasting, UT weld testing and full MTC documentation for every shipment.
Applications
Pre-engineered steel structures are ideal for distribution warehouses, heavy manufacturing workshops, cold storage facilities, aircraft hangars, agricultural storage sheds and multi-story commercial buildings. Pair structural steel with our insulated sandwich panels or single-skin roofing sheets for a complete turnkey package.
Buyer Questions
Answers to common engineering, material equivalence, corrosion protection and container shipping questions.
Our primary welded and hot-rolled H-sections are fabricated from Q355B structural steel (minimum yield strength 355 MPa, equivalent to ASTM A572 Grade 50, EN S355JR, and Australian AS/NZS 3678 Grade 350) or Q235B (equivalent to ASTM A36 / S235JR). Full Mill Test Certificates (MTC) and ultrasonic weld inspection reports are supplied.
All primary steel columns and rafters undergo automated shot blasting to Sa 2.5 cleanliness (ISO 8501-1) before coating. Options include alkyd primer + topcoat (100–120 μm DFT) for dry inland warehouses, epoxy zinc-rich primer + epoxy mio + polyurethane topcoat (160–240 μm DFT) for industrial/coastal environments, or full Hot-Dip Galvanizing (HDG, 65–85 μm / 500–600 g/m² per ASTM A123 / AS/NZS 4680).
All structural members are designed with bolted splice joints so maximum individual piece lengths stay under 11.8 meters for standard 40HQ or 40OT (Open Top) containers. We use custom steel loading pallets on rollers (skids) with timber separators and heavy wire lashing so your crew can pull entire steel bundles smoothly out of the container with a forklift.
Yes. Every steel structure order includes foundation anchor bolt layout drawings, detailed Tekla 3D erection drawings with hard-stamped part numbers on every steel member, and a complete fastener package (M24–M36 foundation anchor bolts, Grade 10.9S / ASTM A325 high-strength structural bolts, Grade 4.8 purlin bolts, and turnbuckle bracing rods).
Project Portfolio & System Solutions
Explore real-world steel building projects fabricated by ZhuAi or pair your structural frame with our wall, roof and floor systems.
Need Steel Structure Products?
Share span, height, bay spacing and cladding preference. We will outline a structure and envelope package within 24 hours.
Review our authoritative 2026 FOB cost breakdown ($32–$98/m²), steel tonnage benchmarks (26–85 kg/m²), crane beam impacts, and single-skin vs. sandwich panel cladding upgrades.
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