Q690FTE Wind Turbine Tower Steel Plate
This article introduces Q690FTE 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. Q690FTE provides 690 MPa minimum yield, excellent low-temperature toughness at -40°C (Grade E) with 34J guaranteed impact energy, and complies with GB/T 28410-2012 for high-strength wind tower construction in cold regions.
📊 Q690FTE Approximate Grade Lookup Table
Chemical Composition (GB/T 28410-2012, mass fraction / %)
| Element | Value / Range |
|---|---|
| Grade | Q690FT E |
| 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 ≤ | 0.80 |
| Als ≥ | 0.015 |
| N ≤ | 0.010 |
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 E |
| 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 E, -40°C) ≥ | 34 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 (34J min), F -50°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 (34J min), F -50°C.
Key Technical Specifications
- Standard: GB/T 28410-2012 (wind tower steel)
- Delivery: Normalized / TMCP / Quenched + Tempered (QT) for high strength & low temp
- 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: E (-40°C) standard, 34J minimum; C/D/F optional
- Certification: EN 10204 3.1/3.2 mill certificate included
Applications
- Heavy-duty tower shell sections for onshore/offshore wind turbines in cold climates (down to -40°C)
- Flanges, ring stiffeners, connection brackets requiring 690 MPa yield and -40°C toughness
- Internal platforms, ladder supports, door frames for arctic wind farms
- Transition pieces and bottom sections for next-generation multi-megawatt turbines in low-temp environments
Important: All technical data are based on GB/T 28410-2012 for Q690FTE. Final parameters should be confirmed in purchase order. Values may be adjusted for thickness. Grade E guarantees 34J minimum at -40°C, ideal for cold regions with high strength demand.
For immediate inquiries, contact via WhatsApp. For detailed specs, visit the product page.
✅ Q690FTE (Grade E, -40°C impact, 34J) · GB/T 28410-2012 · Mill certificate included