Q550FTD Wind Turbine Tower Steel Plate
This article introduces Q550FTD 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. Q550FTD is a high-strength low-alloy steel plate offering minimum yield strength of 460 MPa (≤16mm), excellent toughness at -20°C (Grade D, 34J), and complies with GB/T 28410-2012 for wind tower construction in cold environments requiring enhanced load capacity.
📊 Q550FTD Approximate Grade Lookup Table
Chemical Composition (GB/T 28410-2012, mass fraction / %)
| Element | Value / Range |
|---|---|
| Grade | Q550FT D |
| C ≤ | 0.20 |
| Mn | ≤ 1.80 |
| P ≤ | 0.020 |
| S ≤ | 0.010 |
| Si ≤ | 0.60 |
| Nb ≤ | 0.070 |
| V ≤ | 0.15 |
| Ti ≤ | 0.050 |
| Mo ≤ | 0.50 |
| Cr ≤ | 0.80 |
| Ni ≤ | 0.80 |
| Cu ≤ | 0.80 |
| Als ≥ | 0.015 |
| N ≤ | 0.012 |
Note: The lower limit of Mn content for normalized delivery shall be as specified in the table. No lower limit required for other conditions.
Mechanical Properties & Processing (GB/T 28410-2012)
| Property | Specification |
|---|---|
| Grade | Q550FT D |
| Yield ReL ≥ (≤16 mm) | 550 MPa |
| Yield ReL ≥ (16~40 mm) | 550 MPa |
| Yield ReL ≥ (40~100 mm) | 530 MPa |
| Tensile Rm | 670 ~ 830 MPa |
| Elongation A ≥ | 16% |
| Impact KV2 (Grade D, -20°C) ≥ | 47 J |
| Bending 180° (thickness ≤16 mm) | d = 2a |
| Bending 180° (thickness 16~100 mm) | d = 3a |
Notes:
1. When yield 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 offers -20°C impact, 34J min)
5. Q550FT series designates 550MPa grade; actual yield strength values as above.
1. When yield 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 offers -20°C impact, 34J min)
5. Q550FT series designates 550MPa grade; actual yield strength values as above.
Key Technical Specifications
- Standard: GB/T 28410-2012 (wind tower steel)
- Delivery: Normalized / TMCP / QT (fine-grain treatment for high strength)
- Thickness: 8–100 mm (custom up to 150 mm available)
- Width: up to 5300 mm; Length: up to 12000 mm
- Yield Strength: 460 MPa (≤16mm), 440 MPa (16-40mm), 420 MPa (40-100mm)
- Impact grade: D (-20°C) standard, 34J minimum
- Certification: EN 10204 3.1/3.2 mill certificate
Applications
- Tower shell sections for large wind turbines in cold climate zones requiring 550MPa grade steel
- Flanges, ring stiffeners, connection brackets requiring -20°C impact toughness at high strength
- Transition pieces and bottom sections for tall towers in low-temperature regions
- Onshore and offshore wind power projects demanding reliable performance at -20°C
Important: All technical data are based on GB/T 28410-2012 for Q550FTD. Final parameters should be confirmed in purchase order. Values may be adjusted for thickness. Grade D guarantees 34J minimum at -20°C.
For immediate inquiries, contact via WhatsApp. For detailed specs, visit the product page.
✅ Q550FTD (Grade D, -20°C impact, 34J) · Yield 460/440/420 MPa · GB/T 28410-2012 · Mill certificate included