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| Property | Parameter | Description |
|---|---|---|
| Product Name | Flat Steel for Construction | Hot-rolled or cold-drawn flat bar used in structural and civil engineering applications |
| Material Grade | S235JR / S275JR / S355JR / S355J2 (EN); A36 / A572 Gr.50 (ASTM); Q235B / Q345B (GB); SS400 / SM490 (JIS) | International equivalent grades available upon request; dual-certified material supported |
| Standard Compliance | EN 10025-2, ASTM A36 / A572, GB/T 700 / GB/T 1591, JIS G3101 / G3106 | Full mill test reports (MTR) traceable to applicable standards provided with each shipment |
| Chemical Composition – C | ≤ 0.20% (S235JR); ≤ 0.22% (S355JR) | Carbon content controlled to ensure weldability and structural integrity |
| Chemical Composition – Mn / Si / P / S | Mn ≤ 1.60%; Si ≤ 0.55%; P ≤ 0.035%; S ≤ 0.035% | Balanced alloy composition per EN 10025-2 / ASTM A36 requirements |
| Tensile Strength | 360–510 MPa (S235JR); 470–630 MPa (S355JR); 400–550 MPa (A36) | Tested per EN ISO 6892-1 or ASTM E8/E8M; values vary by grade and thickness |
| Yield Strength | ≥ 235 MPa (S235JR); ≥ 355 MPa (S355JR); ≥ 250 MPa (A36, t ≤ 20 mm) | Minimum yield strength guaranteed; ReH values decrease with increasing thickness |
| Elongation | ≥ 26% (S235JR, L0=5.65√S0); ≥ 22% (S355JR); ≥ 20% (A36) | Longitudinal tensile test; adequate ductility for bending, welding, and forming operations |
| Thickness Range | 3 mm – 100 mm | Standard thickness increments: 3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 40, 50, 60, 80, 100 mm |
| Width Range | 20 mm – 400 mm | Common widths: 20, 25, 30, 40, 50, 60, 75, 80, 100, 120, 150, 200, 250, 300, 400 mm |
| Length | 3,000 mm – 12,000 mm (standard); custom cut-to-length available | Random or fixed length; tolerance per EN 10279 or customer specification |
| Surface Finish | Hot-rolled (black scale); pickled and oiled (P&O); shot-blasted Sa 2.5; primed | Surface condition selected based on downstream fabrication or corrosion protection requirements |
| Dimensional Tolerance | Width: ±0.5–1.5 mm; Thickness: ±0.3–1.0 mm; Length: +50/−0 mm | Per EN 10279 Class A/B or ASTM A6/A6M; tighter tolerances available on request |
| Application | Structural frames, bridges, machinery bases, brackets, grating supports, reinforcement, formwork | Widely used in civil construction, industrial fabrication, infrastructure, and general engineering |
| Certification | ISO 9001:2015; CE Marking (EN 1090-1); Lloyd's / BV / DNV / ABS mill approval available | Third-party inspection (SGS, Intertek, BV) and EN 10204 3.1 / 3.2 MTR supported |
| Packaging | Bundled with steel strapping (≤ 3,000 kg/bundle); wooden dunnage; seaworthy export packing | Rust-preventive oil coating applied for sea freight; labeling per customer or standard requirement |
| MOQ | 5 metric tons per grade/size combination | Mixed container loading accepted; spot stock available for standard sizes with shorter lead time |
Initial width tolerance issue on 500mm flat bars — resolved after supplier intervention
Ordered 12 tons of A36 flat steel in 500×20mm for heavy base plate fabrication. Upon arrival, our QC team measured width deviations of +1.8mm on approximately 15% of bars — outside our project tolerance of ±1.0mm. We raised the issue immediately with the supplier's technical team. To their credit, they responded within 24 hours, acknowledged the batch variation, and arranged a partial replacement shipment within 10 days at no additional cost. Final material passed all ASTM A36 mechanical requirements. The issue was resolved professionally, but we'd expect tighter QC at dispatch going forward. Rating reflects the experience holistically.
Ordered 12 tons of A36 flat steel in 500×20mm for heavy base plate fabrication. Upon arrival, our QC team measured width deviations of +1.8mm on approximately 15% of bars — outside our project tolerance of ±1.0mm. We raised the issue immediately with the supplier's technical team. To their credit, they responded within 24 hours, acknowledged the batch variation, and arranged a partial replacement shipment within 10 days at no additional cost. Final material passed all ASTM A36 mechanical requirements. The issue was resolved professionally, but we'd expect tighter QC at dispatch going forward. Rating reflects the experience holistically.
