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| Property | Parameter | Description |
|---|---|---|
| Product Name | Galvanized Steel Frame Materials for Buildings | Hot-dip or electro-galvanized structural steel sections used in building frame construction |
| Material Grade | S250GD / S350GD / DX51D / Q235 / Q345 | International equivalents: ASTM A653 Grade 33/50, EN 10346 S250GD+Z, JIS G3302 SGCC |
| Standard Compliance | ASTM A653 / EN 10346 / JIS G3302 / GB/T 2518 | Meets hot-dip galvanized steel sheet and coil standards for structural applications |
| Chemical Composition (C) | ≤ 0.20% | Low carbon content ensures good weldability and formability |
| Chemical Composition (Mn) | ≤ 1.50% | Manganese enhances strength and hardenability of the base steel |
| Chemical Composition (P / S) | P ≤ 0.030% / S ≤ 0.030% | Controlled phosphorus and sulfur for improved toughness and reduced brittleness |
| Chemical Composition (Si) | ≤ 0.50% | Silicon content controlled to maintain coating adhesion quality |
| Tensile Strength | 330 – 560 MPa | Per EN 10346 / ASTM A653; varies by grade (e.g., S250GD: ≥ 330 MPa, S350GD: ≥ 420 MPa) |
| Yield Strength | 250 – 350 MPa | Minimum yield strength: S250GD ≥ 250 MPa, S350GD ≥ 350 MPa per EN 10346 |
| Elongation | ≥ 18% – 22% | Measured over 80 mm gauge length; ensures ductility for frame bending and forming |
| Zinc Coating Weight | Z100 – Z275 (100 – 275 g/m²) | Both sides combined; Z275 recommended for structural outdoor building frames |
| Dimension Range | Thickness: 0.3 – 6.0 mm; Width: 600 – 1500 mm; Length: 1000 – 12000 mm | Custom cut-to-length, coil, C/Z/U-section profiles available upon request |
| Surface Finish | Regular Spangle / Minimized Spangle / Zero Spangle | Smooth galvanized surface; passivation or oiled treatment available for corrosion protection |
| Application | Light gauge steel framing, wall studs, roof trusses, purlins, floor joists, curtain wall frames | Widely used in residential, commercial, and industrial building construction |
| Certification | ISO 9001 / CE Marking / SGS / BV | Third-party inspection and mill test certificates (MTC) available per EN 10204 3.1 |
| Packaging | Coil / Bundle / Pallet; wrapped with waterproof paper and steel strip | Export seaworthy packaging; coil weight typically 3 – 10 MT per coil |
| MOQ | 5 Metric Tons per size/grade | Mixed grades accepted for full container load (FCL) orders; sample orders negotiable |
Initial coating thickness variance — issue resolved satisfactorily
Ordered 40 tonnes of galvanized Z-purlins, 1.6 mm, Z350 coating for a commercial roofing project in Florida. Upon arrival, our QC team identified that approximately 8% of profiles showed coating thickness slightly below the Z350 specification — measuring closer to Z275 in isolated spots. We raised this immediately and the supplier's technical team responded within 24 hours, arranged third-party re-inspection, and replaced the non-conforming batch within 12 days at no additional cost. ASTM A653 compliance was confirmed on the replacement material. The resolution process was handled professionally. Would consider reordering with tighter pre-shipment inspection requested upfront.
Ordered 40 tonnes of galvanized Z-purlins, 1.6 mm, Z350 coating for a commercial roofing project in Florida. Upon arrival, our QC team identified that approximately 8% of profiles showed coating thickness slightly below the Z350 specification — measuring closer to Z275 in isolated spots. We raised this immediately and the supplier's technical team responded within 24 hours, arranged third-party re-inspection, and replaced the non-conforming batch within 12 days at no additional cost. ASTM A653 compliance was confirmed on the replacement material. The resolution process was handled professionally. Would consider reordering with tighter pre-shipment inspection requested upfront.
