Q690FTD Wind Turbine Tower Steel Plate
This article introduces Q690FTD structural steel for wind turbine towers manufactured by Chinese steel mills, hoping to meet your needs and encourage you to purchase this grade of steel. Q690FTD provides 690 MPa minimum yield, excellent toughness at -20°C (Grade D) with 47J guaranteed impact energy, and complies with GB/T 28410-2012 for high-strength wind tower construction in moderate cold climates.
📊 Q690FTD Approximate Grade Lookup Table
Chemical Composition (GB/T 28410-2012, mass fraction / %)
| Element | Value / Range |
|---|---|
| Grade | Q690FT D |
| C ≤ | 0.20 |
| Mn ≤ | 1.80 (lower limit only for normalized*) |
| P ≤ | 0.020 |
| S ≤ | 0.010 |
| Si ≤ | 0.60 |
| Nb ≤ | 0.070 |
| V ≤ | 0.15 |
| Ti ≤ | 0.050 |
| Mo ≤ | 0.050 |
| Cr ≤ | 0.80 |
| Ni ≤ | 0.80 |
| Cu ≤ | 0.80 |
| Als ≥ | 0.015 |
| N ≤ | 0.012 |
Note: The lower limit of Mn content for steel plates delivered in normalized condition shall be as specified in the table. No lower limit required for other conditions.
Mechanical Properties & Processing (GB/T 28410-2012)
| Property | Specification |
|---|---|
| Grade | Q690FT D |
| Yield ReL ≥ (≤16 mm) | 690 MPa |
| Yield ReL ≥ (16~40 mm) | 690 MPa |
| Yield ReL ≥ (40~100 mm) | 670 MPa |
| Tensile Rm (all thickness) | 770 ~ 940 MPa |
| Elongation A ≥ | 14% |
| Impact KV2 (Grade D, -20°C) ≥ | 47 J (longitudinal) |
| Bending 180° (thickness ≤16 mm) | d = 2a |
| Bending 180° (thickness 16~100 mm) | d = 3a |
Notes:
1. When yield strength is not significant, Rp0.2 may be used.
2. For thickness >60 mm, elongation may be reduced by 1%.
3. Impact test uses longitudinal specimens.
4. Impact temperature by grade: B 20°C, C 0°C, D -20°C, E -40°C, F -50°C. (Grade D provides 47J at -20°C)
1. When yield strength is not significant, Rp0.2 may be used.
2. For thickness >60 mm, elongation may be reduced by 1%.
3. Impact test uses longitudinal specimens.
4. Impact temperature by grade: B 20°C, C 0°C, D -20°C, E -40°C, F -50°C. (Grade D provides 47J at -20°C)
Key Technical Specifications
- Standard: GB/T 28410-2012 (wind tower steel)
- Delivery: Normalized / TMCP / Quenched + Tempered (QT) for high strength
- Thickness range: 8–100 mm (custom up to 120 mm on request)
- Width: up to 5300 mm; Length: up to 12000 mm or coil
- Impact grade: D (-20°C) standard, 47J minimum; C/E/F optional
- Certification: EN 10204 3.1/3.2 mill certificate included
Applications
- Heavy-duty tower shell sections for onshore/offshore wind turbines (high strength reduces weight)
- Flanges, ring stiffeners, connection brackets requiring 690 MPa yield and -20°C toughness
- Internal platforms, ladder supports, door frames in large wind towers
- Transition pieces and bottom sections for next-generation multi-megawatt turbines
Important: All technical data are based on GB/T 28410-2012 for Q690FTD. Final parameters should be confirmed in purchase order. Values may be adjusted for thickness. Grade D guarantees 47J minimum at -20°C, ideal for moderate cold regions with high strength demand.
For immediate inquiries, contact via WhatsApp. For detailed specs, visit the product page.
✅ Q690FTD (Grade D, -20°C impact, 47J) · GB/T 28410-2012 · Mill certificate included