Q345FTE Wind Power Steel

High-Strength Extreme Low-Temperature Grade – 345MPa Yield, Guaranteed -40°C Impact Toughness (34J) for Arctic Wind Towers

📏 Standard: GB/T 28410-2012
🏗️ Arctic / Subarctic Wind Towers
❄️ Impact -40°C / 34J

Product Overview

This article introduces Q345FTE 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. Q345FTE provides 345 MPa minimum yield, excellent toughness at -40°C (Grade E), and complies with GB/T 28410-2012 for wind tower construction in extremely cold environments.

Q345FTE (Grade E) is a high-strength structural steel plate specifically designed for wind power generation equipment requiring higher load-bearing capacity and extreme low-temperature toughness, complying with GB/T 28410-2012.

Key Advantages

  • Extreme Low-Temperature Toughness: Guaranteed impact toughness at -40°C (34J) – ideal for arctic and subarctic wind farms.
  • High Strength + Cold Durability: 345MPa minimum yield strength combined with exceptional performance in extreme cold environments.
  • Excellent Weldability: Optimized chemical composition with low carbon equivalent and tighter P/S control ensures reliable fabrication.
  • Cost-Effective Arctic Solution: Higher strength allows for optimized tower designs in extreme environments, reducing overall project costs.

International Grade Comparison

🇨🇳 Q345FTE (GB/T 28410-2012)
C: ≤0.20%
Mn: 0.90-1.65%
P: ≤0.020%
S: ≤0.010%
Si: ≤0.50%
Als: ≥0.015%
Yield: ≥345MPa (≤16mm)
Impact: -40°C (34J)
🇪🇺 EN 10025-2 S355 Series
C: ≤0.22%
Mn: ≤1.60%
P: ≤0.035%
S: ≤0.035%
Si: ≤0.55%
N: ≤0.012%
Yield: ≥355MPa
Impact: JR=20°C / J0=0°C / J2=-20°C
Comparison Note: EN S355 series typically only guarantees to -20°C. Q345FTE's -40°C requirement exceeds standard specifications.
🇺🇸 ASTM A709 Gr.50 (A709Gr50)
C: ≤0.23%
Mn: 0.60-1.35%
P: ≤0.035%
S: ≤0.035%
Si: 0.15-0.40%
Cu: ≥0.20%
Yield: ≥345MPa (50ksi)
Tensile: ≥450MPa
Note: A709 Gr.50 is not rated for -40°C. Q345FTE is a specialized extreme low-temperature steel.
Note: Q345FTE is a specialized extreme low-temperature steel. Standard international specifications like EN 10025-2 S355 and ASTM A709 do not certify impact properties at -40°C. Q345FTE is designed specifically for arctic wind power applications.

Domestic Grade Comparison: Q275FTE / Q420FTE / Q345FTD

Q275FTE
Impact: -40°C

Yield: ≥275MPa

Tensile: 410-560MPa

Impact Energy: 34J

Q345FTE ★
Impact: -40°C

Yield: ≥345MPa

Tensile: 470-630MPa

Impact Energy: 34J

Q420FTE
Impact: -40°C

Yield: ≥420MPa

Tensile: 520-680MPa

Impact Energy: 34J

Q345FTD
Impact: -20°C

Yield: ≥345MPa

Tensile: 470-630MPa

Impact Energy: 47J

Note: Q345FTE offers high strength (345MPa) with -40°C impact toughness. Q275FTE provides -40°C with lower strength. Q420FTE gives even higher strength (420MPa) with -40°C impact. Q345FTD has -20°C impact with higher energy (47J) for less extreme conditions.

Technical Specifications

Q345FTE Chemical Composition (GB/T 28410-2012, wt%)

Element / Parameter Grade: Q345FT Class: E
C (max) 0.20
Mn 0.90~1.65
P (max) 0.020
S (max) 0.010
Si (max) 0.50
Nb (max) 0.060
V (max) 0.12
Ti (max) 0.050
Mo (max) 0.20
Cr (max) 0.30
Ni (max) 0.50
Cu (max) 0.30
Als (min) 0.015
N (max) 0.010
Note: Tighter P/S control (P≤0.020%, S≤0.010%) and lower N content for enhanced low-temperature toughness at -40°C.

Applications

Arctic & Subarctic Large Wind Turbine Towers

Primary application for Q345FTE, offering high strength (345MPa yield) and extreme -40°C impact toughness for wind turbine tower structures in arctic, subarctic, high-altitude, and other extreme cold regions requiring superior load-bearing capacity and cold resistance.

  • Tower shell sections for arctic and subarctic wind farms
  • Flanges, ring stiffeners, connection brackets requiring -40°C impact certification
  • Internal platforms, ladder supports, door frames in extreme low-temperature service
  • Offshore wind towers and structures subjected to freezing conditions
  • High-altitude plateau wind power installations

Available Supply Range

📏 Thickness Range

  • Plates: 8mm - 150mm
  • 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 extreme cold 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 E (-40°C).
  • Lead Time: Typically 35-50 days after order confirmation for extreme cold-grade steel.

Frequently Asked Questions

What is the difference between Q345FTE and Q345FTD?

Q345FTE has guaranteed impact toughness at -40°C (34J), while Q345FTD is tested at -20°C (47J). Q345FTE is designed for arctic, subarctic, and extreme cold climate wind power applications.

What are the international equivalents of Q345FTE?

Standard EN 10025-2 S355 series typically only guarantees down to -20°C (S355J2). ASTM A709 Gr.50 is not rated for -40°C. Q345FTE is a specialized extreme low-temperature steel with no direct equivalent in common standards.

Do you offer third-party inspection for -40°C impact testing?

Yes, SGS, BV, TÜV available for pre-shipment inspection including low-temperature impact verification at -40°C.

Request a Quotation

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