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| Property | Parameter | Description |
|---|---|---|
| Product Name | High Strength Structural Steel for Building | Heavy-duty steel designed for load-bearing building structures and frames |
| Material Grade | Q345B / Q390B / Q420C / S355JR / A572 Gr.50 | Equivalent grades: EN 10025 S355JR, ASTM A572 Grade 50, JIS G3106 SM490 |
| Standard Compliance | GB/T 1591, EN 10025-2, ASTM A572, JIS G3106 | Meets international structural steel standards for building construction |
| Chemical Composition (C) | ≤ 0.20% | Low carbon content ensures good weldability and toughness |
| Chemical Composition (Mn) | 1.00% – 1.70% | Manganese enhances strength and hardenability |
| Chemical Composition (Si) | ≤ 0.55% | Silicon improves deoxidation and strength |
| Chemical Composition (P / S) | P ≤ 0.035% / S ≤ 0.035% | Controlled phosphorus and sulfur for improved ductility and impact resistance |
| Tensile Strength | 470 – 630 MPa | Per GB/T 1591 Q345B; S355JR per EN 10025-2: 470–630 MPa |
| Yield Strength | ≥ 345 MPa (t ≤ 16 mm) | Minimum yield strength decreases with increasing thickness per standard |
| Elongation | ≥ 20% | Longitudinal elongation at fracture ensuring structural ductility |
| Impact Toughness | ≥ 34 J at 0°C (Charpy V-notch) | Suitable for cold-climate building applications |
| Dimension Range | Thickness: 6–150 mm; Width: 1500–4200 mm; Length: 6000–18000 mm | Available as plates, sheets, and structural sections (H-beam, angle, channel) |
| Surface Finish | Hot-rolled, Blast-cleaned (Sa2.5), Primer-coated | Standard mill finish; anti-rust treatment available upon request |
| Application | High-rise buildings, bridges, industrial plants, steel frames, trusses | Widely used in structural engineering and civil construction projects |
| Certification | ISO 9001, CE Marking, Mill Test Certificate (EN 10204 3.1/3.2) | Third-party inspection by SGS, BV, TÜV available |
| Packaging | Bundle with steel strip; waterproof paper + steel plate protection | Sea-worthy export packing; bare or bundled per customer requirement |
| MOQ | 25 Metric Tons per grade/size | Mixed sizes accepted; spot stock available for standard grades |
Initial thickness tolerance issue — resolved promptly, project not impacted
We ordered 30 tonnes of S550 plates (EN 10025-6, 50mm nominal thickness) for a heavy-load industrial mezzanine. On incoming inspection, four plates measured 48.6mm — slightly outside the EN 10029 Class B tolerance we'd specified. Raised this immediately with the supplier. They responded within 4 hours, arranged replacement plates dispatched within 5 business days, and covered the freight cost. Project timeline was not affected. The replacement batch was perfect. Supplier's after-sales response was genuinely good. Dropping one star for the initial QC miss, but their resolution process was professional.
We ordered 30 tonnes of S550 plates (EN 10025-6, 50mm nominal thickness) for a heavy-load industrial mezzanine. On incoming inspection, four plates measured 48.6mm — slightly outside the EN 10029 Class B tolerance we'd specified. Raised this immediately with the supplier. They responded within 4 hours, arranged replacement plates dispatched within 5 business days, and covered the freight cost. Project timeline was not affected. The replacement batch was perfect. Supplier's after-sales response was genuinely good. Dropping one star for the initial QC miss, but their resolution process was professional.
