Q275FTC Wind Turbine Tower Steel Plate
Q275FTC is a high-strength structural steel plate manufactured in accordance with GB/T 28410-2012, specifically designed for wind turbine tower construction requiring enhanced load-bearing capacity and reliable toughness. This grade provides higher yield strength (275 MPa) compared to Q235 series, excellent weldability, and guaranteed impact properties at 0°C, making it suitable for wind power installations requiring superior strength-to-weight ratio.
Chemical Composition (GB/T 28410-2012, Quality Fraction / %)
| Property | Value / Range |
|---|---|
| Grade | Q275FT C |
| C (Carbon) ≤ | 0.18 |
| Mn (Manganese) | 0.50 ~ 1.50 |
| P (Phosphorus) ≤ | 0.025 |
| S (Sulfur) ≤ | 0.020 |
| Si (Silicon) ≤ | 0.50 |
| Nb (Niobium) ≤ | 0.050 |
| V (Vanadium) ≤ | 0.060 |
| Ti (Titanium) ≤ | 0.050 |
| Mo (Molybdenum) ≤ | 0.10 |
| Cr (Chromium) ≤ | 0.30 |
| Ni (Nickel) ≤ | 0.30 |
| Cu (Copper) ≤ | 0.30 |
| Als (Acid-soluble Aluminum) ≥ | 0.015 |
| N (Nitrogen) ≤ | 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 of Mn content shall be required for steel plates delivered in other conditions.
Mechanical Properties & Processing Characteristics (GB/T 28410-2012)
| Property | Value / Specification |
|---|---|
| Grade | Q275FT C |
| Yield Strength (ReL) ≥ Thickness ≤ 16mm |
275 N/mm² |
| Yield Strength (ReL) ≥ Thickness ＞ 16~40mm |
265 N/mm² |
| Yield Strength (ReL) ≥ Thickness ＞ 40~100mm |
255 N/mm² |
| Tensile Strength (Rm) | 410 ~ 560 N/mm² |
| Elongation after Fracture (A) ≥ | 21% |
| Impact Energy (KV2) ≥ | 47 J (at 0°C) |
| Bending Test (180°) Thickness ≤ 16mm |
d = 2a |
| Bending Test (180°) Thickness ＞ 16~100mm |
d = 3a |
Notes:
1. When yield strength is not significant, Rp0.2 can be used instead of lower yield strength.
2. When the thickness is > 60mm, the elongation after fracture can be reduced by 1%.
3. The impact test uses longitudinal specimens.
4. Impact test temperatures corresponding to different quality grades: B: 20℃, C: 0℃, D: -20℃, E: -40℃, F: -50℃.
1. When yield strength is not significant, Rp0.2 can be used instead of lower yield strength.
2. When the thickness is > 60mm, the elongation after fracture can be reduced by 1%.
3. The impact test uses longitudinal specimens.
4. Impact test temperatures corresponding to different quality grades: B: 20℃, C: 0℃, D: -20℃, E: -40℃, F: -50℃.
Key Technical Specifications
- Primary Standard: GB/T 28410-2012 (Base Plate for Wind Tower)
- Product Form: Hot-rolled steel plate, available in normalized or TMCP condition.
- Typical Dimensions:
- Thickness: 8 - 100mm (Standard range, wider availability upon request)
- Width: Up to 5,300mm
- Length: Up to 12,000mm or as required
- Tolerances: In accordance with GB/T 709 or DIN EN 10029, as specified.
- Impact Temperature: Grade C (0℃) as per table. Grades B (20℃), D (-20℃), E (-40℃), and F (-50℃) also available upon request with adjusted chemical composition.
- Certification: Supplied with Mill Test Certificate EN 10204 Type 3.1/3.2.
Applications
Q275FTC is specifically designed for wind turbine tower components requiring higher strength and reliable toughness at 0°C:
- Tower cylindrical and conical sections for medium-to-large wind turbines
- Flange rings and structural connections requiring 275 MPa yield strength
- Load-bearing internal platforms and ladder supports
- Transition sections and door frame reinforcements
- Onshore wind power projects with standard temperature service conditions
Important: All technical data are based on GB/T 28410-2012 standard requirements for Q275FTC grade. Specific technical parameters should be confirmed in the purchase order and accompanying technical agreement. Values may be adjusted for different thickness ranges and impact temperature requirements.
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