Q275FTF Wind Power Steel

Ultimate Polar Grade – 275MPa Yield, Guaranteed -50°C Impact Toughness (34J) for Arctic & Antarctic Wind Farms

📏 Standard: GB/T 28410-2012
🏗️ Polar / Antarctic Wind Towers
❄️ Impact -50°C / 34J

Product Overview

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.

Q275FTF (Grade F) represents the highest low-temperature toughness grade in the GB/T 28410-2012 standard, designed for polar and extreme cold climate wind power applications where temperatures can drop below -50°C.

Key Advantages

  • Ultimate Low-Temperature Toughness: Guaranteed impact toughness at -50°C (34J) – the highest cold-resistance grade available for wind tower steel.
  • High Strength + Polar Durability: 275MPa minimum yield strength combined with exceptional performance in polar environments.
  • Excellent Weldability: Optimized chemical composition with low carbon equivalent and tighter P/S control ensures reliable fabrication.
  • Cost-Effective Polar Solution: Higher strength allows for optimized tower designs in extreme environments, reducing overall project costs.

International Grade Comparison

🇨🇳 Q275FTF (GB/T 28410-2012)
C: ≤0.18%
Mn: 0.50-1.50%
P: ≤0.025%
S: ≤0.015%
Si: ≤0.50%
Als: ≥0.015%
Yield: ≥275MPa (≤16mm)
Impact: -50°C (34J)
🇪🇺 EN 10025-2 S275 Series
C: ≤0.21%
Mn: ≤1.50%
P: ≤0.035%
S: ≤0.035%
Si: ≤0.40%
N: ≤0.012%
Yield: ≥275MPa
Impact: JR=20°C / J0=0°C / J2=-20°C
Comparison Note: EN S275 series typically only guarantees to -20°C. Q275FTF's -50°C requirement far exceeds standard specifications.
🇺🇸 ASTM A709 Gr.36 (A709Gr36)
C: ≤0.26%
Mn: 0.60-0.90%
P: ≤0.035%
S: ≤0.035%
Si: 0.15-0.40%
Cu: ≥0.20%
Yield: ≥250MPa (36ksi)
Tensile: 400-550MPa
Note: A709 Gr.36 is not rated for -50°C. Q275FTF is a specialized ultimate low-temperature steel.
Note: Q275FTF is a specialized ultimate low-temperature steel. Standard international specifications like EN 10025-2 S275 and ASTM A709 do not certify impact properties at -50°C. Q275FTF is designed specifically for polar wind power applications.

Domestic Grade Comparison: Q275FTD / Q275FTE / Q345FTF

Q275FTD
Impact: -20°C

Yield: ≥275MPa

Tensile: 410-560MPa

Impact Energy: 47J

Q275FTE
Impact: -40°C

Yield: ≥275MPa

Tensile: 410-560MPa

Impact Energy: 34J

Q275FTF ★
Impact: -50°C

Yield: ≥275MPa

Tensile: 410-560MPa

Impact Energy: 34J

Q345FTF
Impact: -50°C

Yield: ≥345MPa

Tensile: 470-630MPa

Impact Energy: 34J

Note: Q275FTF is the ultimate polar grade (F = -50°C impact). Q275FTE offers -40°C, Q275FTD provides -20°C with higher impact energy (47J). Q345FTF gives even higher strength (345MPa) with -50°C impact for the most demanding polar applications.

Technical Specifications

Q275FTF Chemical Composition (GB/T 28410-2012, wt%)

Element / Parameter Grade: Q275FT Class: F
C (max) 0.18
Mn 0.50~1.50
P (max) 0.025
S (max) 0.015
Si (max) 0.50
Nb (max) 0.050
V (max) 0.060
Ti (max) 0.050
Mo (max) 0.10
Cr (max) 0.30
Ni (max) 0.30
Cu (max) 0.30
Als (min) 0.015
N (max) 0.010
Note: Tighter P/S control and lower N content for enhanced low-temperature toughness at -50°C.

Applications

Polar & Antarctic Wind Turbine Towers

Primary application for Q275FTF, offering high strength (275MPa yield) and ultimate -50°C impact toughness for wind turbine tower structures in arctic, Antarctic, Siberian, and other polar regions requiring ultimate cold resistance and superior load-bearing capacity.

  • Tower sections for arctic, Antarctic, and Siberian wind farms
  • Flange rings requiring 275 MPa yield strength with -50°C impact certification
  • Structural components for year-round operation in permafrost regions
  • Offshore wind power projects in the Arctic Circle
  • Polar research station wind power installations

Available Supply Range

📏 Thickness Range

  • Plates: 6mm - 120mm
  • Coils: 2.0mm - 12.0mm
  • Custom thickness available

📐 Width & Length

  • Width: 900mm - 5300mm
  • Length: 6000mm - 12000mm
  • Cut-to-length service
Stock availability: Made-to-order for polar grades | Mill order: Custom sizes available with 35-50 days lead time

Custom Fabrication Services

Custom Cutting

Laser/Plasma cutting

Edge Beveling

Single/double bevel

Quality & Manufacturing Assurance

ISO 9001:2015
CE Marking
SGS/BV/TÜV

Packaging & Logistics

  • Standard Packaging: Steel plates bundled with steel straps on wooden skids.
  • Marking: Grade, size, heat number, weight, impact grade F (-50°C).
  • Lead Time: Typically 35-50 days after order confirmation for polar-grade steel.

Frequently Asked Questions

What is the difference between Q275FTF and Q275FTE?

Q275FTF has guaranteed impact toughness at -50°C (34J), while Q275FTE is tested at -40°C (34J). Q275FTF is the ultimate arctic grade designed for polar and Antarctic wind power applications.

What are the international equivalents of Q275FTF?

Standard EN 10025-2 S275 series typically only guarantees down to -20°C (S275J2). ASTM A709 Gr.36 is not rated for -50°C. Q275FTF is a specialized ultimate low-temperature steel with no direct equivalent in common standards.

Do you offer third-party inspection for -50°C impact testing?

Yes, SGS, BV, TÜV available for pre-shipment inspection including low-temperature impact verification at -50°C.

Request a Quotation

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