Q620FTD Wind Turbine Tower Steel Plate
This article introduces Q620FTD 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. Q620FTD provides 620 MPa minimum yield, excellent toughness at -20°C (Grade D), and complies with GB/T 28410-2012 for wind tower construction.
📊 Q620FTD Approximate Grade Lookup Table
Chemical Composition (GB/T 28410-2012, mass fraction / %)
| Element | Value / Range |
|---|---|
| Grade | Q620FT 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 ≤ | 0.50 |
| Cr ≤ | 0.80 |
| Ni ≤ | 0.80 |
| Cu ≤ | 0.55 |
| 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 (typically ≥1.80). No lower limit required for other conditions.
Mechanical Properties & Processing (GB/T 28410-2012)
| Property | Specification |
|---|---|
| Grade | Q620FT D |
| Yield ReL ≥ (≤16 mm) | 620 MPa |
| Yield ReL ≥ (16~40 mm) | 620 MPa |
| Yield ReL ≥ (40~100 mm) | 600 MPa |
| Tensile Rm (all thickness) | 710 ~ 880 MPa |
| Elongation A ≥ | 15% |
| Impact KV2 (-20°C, Grade D) ≥ | 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 instead of lower yield strength.
2. For thickness >60 mm, elongation after fracture may be reduced by 1%.
3. Impact test uses longitudinal specimens (standard).
4. Impact temperature by grade: B 20°C, C 0°C, D -20°C, E -40°C, F -50°C.
1. When yield strength is not significant, Rp0.2 may be used instead of lower yield strength.
2. For thickness >60 mm, elongation after fracture may be reduced by 1%.
3. Impact test uses longitudinal specimens (standard).
4. Impact temperature by grade: B 20°C, C 0°C, D -20°C, E -40°C, F -50°C.
Key Technical Specifications
- Standard: GB/T 28410-2012 (wind tower steel) / Q/WG 特有规格
- Delivery: Normalized / TMCP / Quenched + Tempered (QT) available
- 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, C/E/F optional
- Certification: EN 10204 3.1/3.2 mill certificate included
Applications
- Tower shell sections (cylindrical/conical) for onshore/offshore wind turbines
- Flanges, ring stiffeners, connection brackets – high strength demand
- Internal platforms, ladder supports, door frames
- Transition pieces and heavy loaded bottom sections
Important: All technical data are based on GB/T 28410-2012 for Q620FTD (Grade D). Final parameters should be confirmed in purchase order. Values may be adjusted for thickness and impact temperature.
For immediate inquiries, contact via WhatsApp. For detailed specs, visit the product page.