Q275FTF Wind Turbine Tower Steel Plate

Q275FTF is a high-strength structural steel plate manufactured in accordance with GB/T 28410-2012, specifically designed for wind turbine tower construction requiring superior load-bearing capacity and extreme low-temperature toughness. This grade provides higher yield strength (275 MPa) compared to Q235 series, excellent weldability, and guaranteed impact properties at -50°C, making it ideal for wind power installations in arctic, Antarctic, and severe cold climate regions requiring exceptional strength-to-weight ratio and ultimate cold resistance.

Chemical Composition (GB/T 28410-2012, Quality Fraction / %)

Property Value / Range
Grade Q275FT F
C (Carbon) ≤ 0.18
Mn (Manganese) 0.50 ~ 1.50
P (Phosphorus) ≤ 0.025
S (Sulfur) ≤ 0.015
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) ≤ 0.010
Note: The lower limit of Mn content for steel plates delivered in normalized condition shall be as specified in the table. No lower limit 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 F
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) ≥ 34 J (at -50°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℃.

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 F (-50℃) as per table, the highest low-temperature toughness grade available. Grades B (20℃), C (0℃), D (-20℃), and E (-40℃) also available upon request with adjusted chemical composition.
  • Certification: Supplied with Mill Test Certificate EN 10204 Type 3.1/3.2.

Applications

Q275FTF is specifically designed for wind turbine tower components requiring high strength and the highest level of low-temperature toughness at -50°C:

  • Tower cylindrical and conical sections for arctic, Antarctic, and Siberian wind farms
  • Flange rings and structural connections requiring 275 MPa yield strength with -50°C impact certification
  • Load-bearing internal platforms and ladder supports in extreme polar environments
  • Transition sections and door frame reinforcements for year-round operations in permafrost regions
  • Offshore wind power projects in the Arctic Circle and other severe cold climate zones
Important: All technical data are based on GB/T 28410-2012 standard requirements for Q275FTF 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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