Description
Tianjin Sino East Steel supplies Q355B high-strength low-alloy (HSLA) structural steel plates to construction contractors, engineering fabricators, and steel service centres worldwide. Q355B delivers a minimum yield strength of 355 MPa — 51% stronger than standard Q235B — making it ideal for load-bearing structures, heavy equipment chassis, bridges, mining machinery, and offshore platforms.
Q355B Steel Plate — Full Specification
| Parameter | Value |
|---|---|
| Material Grade | Q355B (GB/T 1591) ≈ S355JR (EN 10025) ≈ A572 Gr.50 (ASTM) |
| Yield Strength (ReH) | ≥ 355 MPa (t ≤ 16mm) / ≥ 345 MPa (16–40mm) |
| Tensile Strength (Rm) | 470 – 630 MPa |
| Elongation (A) | ≥ 22% |
| Impact Energy CVN at 20°C | ≥ 34 J (Charpy V-notch) |
| Thickness Range | 6 mm – 200 mm |
| Width Range | 1,000 mm – 3,200 mm |
| Length Range | 3,000 mm – 12,000 mm (custom cut available) |
| Carbon (C max) | 0.20% (t ≤ 16mm) |
| Manganese (Mn) | 1.00% – 1.60% |
| Phosphorus / Sulphur (max) | 0.025% / 0.020% |
| Surface Finish | Hot Rolled (HR) / Normalised / TMCP available |
| Standard | GB/T 1591-2018 / EN 10025-2 / ASTM A572 |
| Port of Shipment | Tianjin Xingang (CNTXG) — CIF to Tema, Apapa, Jeddah, Rotterdam, Houston |
Q355B vs Q235B — Why Upgrade?
| Property | Q235B | Q355B | Advantage |
|---|---|---|---|
| Yield Strength | 235 MPa | 355 MPa | +51% stronger |
| Tensile Strength | 370–500 MPa | 470–630 MPa | +27% stronger |
| CVN Impact at 20°C | 27 J | 34 J | Better toughness |
| Plate thickness saving | Baseline | -15% to -20% | Lower total weight |
| Price premium | Baseline | +5% to +8% | Excellent cost/strength ratio |
Key Application Scenarios
- Bridge Girders & Flyovers: Meets AASHTO M270 Grade 50 equivalent; widely specified for Ghana, Nigeria, and UAE highway infrastructure projects.
- Mining Equipment Frames: Crusher frames, conveyor support structures, mine shaft liners operating under dynamic impact loads.
- Oil & Gas Skid Bases: Pipeline support cradles and pressure vessel shell plates for offshore and onshore facilities in West Africa.
- Port & Marine Structures: Quay walls, dolphins, and fender backing plates for Tema Port, Apapa Port, and Takoradi Port expansion projects.
- Industrial Buildings: Column base plates, gusset plates, and moment-frame connections where building codes mandate Grade 50+ steel.
Quality Control & Certifications
| QC Step | Method | Document Provided |
|---|---|---|
| Chemical Composition | Optical Emission Spectroscopy (OES) per batch | Mill Test Report MTC 3.1 |
| Mechanical Testing | Tensile + Charpy impact per GB/T 228 & GB/T 229 | Included in MTC |
| Dimensional Inspection | Laser measurement ±0.3mm tolerance | Dimensional Inspection Report |
| Surface Inspection | Visual per EN 10163-2 Class A | Inspection Certificate |
| Third-Party Inspection | SGS / Bureau Veritas (on request) | TPI Report |
Frequently Asked Questions
Q: Is Q355B equivalent to A572 Grade 50?
A: Yes — functionally equivalent in yield and tensile strength. Q355B additionally mandates Charpy impact testing at 20°C, making it a stronger match for projects requiring documented toughness.
Q: Can you cut plates to custom dimensions?
A: Yes. We offer plasma and oxy-fuel cutting to custom width × length. MOQ for custom cutting is 5 MT. Tolerance: ±2mm width/length, ±0.5mm thickness.
Q: What is the lead time for Q355B plates?
A: Standard thickness 6–50mm from stock: 7–10 days. Heavy gauge 50–200mm custom rolling: 20–30 days from order confirmation.
Q: What shipping terms are available for Ghana/Nigeria?
A: FOB Tianjin, or CIF to Tema Port (Ghana), Apapa Port (Nigeria), or any major worldwide port. Transit time to Tema: 22–28 days.
🏭 Request a Bulk Quote — Tianjin Sino East Steel Enterprise Co., Ltd.
15+ Years Export Experience · ISO 9001 Certified · Mill Test Certificate Included · CIF Worldwide
