Q620FTE Wind Power Steel

Ultra-High-Strength Arctic Grade – 620MPa Yield, Guaranteed -40°C Impact Toughness (34J) for Arctic Large Wind Towers

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

Product Overview

This article introduces Q620FTE 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. Q620FTE provides 620 MPa minimum yield, excellent toughness at -40°C (Grade E), and complies with GB/T 28410-2012 for wind tower construction in cold climates.

Q620FTE (Grade E) is an ultra-high-strength low-alloy structural steel plate specifically designed for large wind power generation equipment requiring maximum load-bearing capacity and extreme low-temperature toughness for arctic conditions.

Key Advantages

  • Ultra-High Strength + Extreme Cold Toughness: 620MPa yield combined with guaranteed -40°C impact toughness (34J).
  • Optimized for Arctic Climates: Designed for large wind towers in arctic and subarctic regions.
  • Excellent Weldability: Optimized chemical composition with low carbon equivalent ensures reliable fabrication.
  • Cost-Effective Arctic Solution: Ultra-high strength enables significant weight reduction for 10MW+ turbines in cold regions.

International Grade Comparison

🇨🇳 Q620FTE (GB/T 28410-2012)
C: ≤0.20%
Mn: ≤1.80%
P: ≤0.020%
S: ≤0.010%
Si: ≤0.60%
Als: ≥0.015%
Yield: ≥620MPa (≤16mm)
Impact: -40°C (34J)
🇪🇺 EN 10025-2 S690 Series
C: ≤0.20%
Mn: ≤1.80%
P: ≤0.035%
S: ≤0.035%
Si: ≤0.60%
N: ≤0.012%
Yield: ≥690MPa
Impact: J2=-20°C
Note: EN S690 series only guarantees to -20°C. Q620FTE's -40°C exceeds standard specs.
🇺🇸 ASTM A709 Gr.100 (A709Gr100)
C: ≤0.20%
Mn: ≤1.35%
P: ≤0.035%
S: ≤0.035%
Si: 0.15-0.40%
Cu: ≥0.20%
Yield: ≥690MPa (100ksi)
Tensile: ≥620MPa
Note: A709 Gr.100 not rated for -40°C. Q620FTE is specialized arctic-grade steel.
Note: Q620FTE is a specialized extreme low-temperature steel. Standard EN 10025-2 S690 and ASTM A709 do not certify impact at -40°C.

Domestic Grade Comparison: Q550FTE / Q690FTE / Q620FTD

Q550FTE
Impact: -40°C

Yield: ≥460MPa

Tensile: 670-830MPa

Impact: 34J

Q620FTE ★
Impact: -40°C

Yield: ≥620MPa

Tensile: 710-880MPa

Impact: 34J

Q690FTE
Impact: -40°C

Yield: ≥690MPa

Tensile: 770-940MPa

Impact: 34J

Q620FTD
Impact: -20°C

Yield: ≥620MPa

Tensile: 710-880MPa

Impact: 47J

Note: Q620FTE offers ultra-high yield strength (620MPa) with -40°C impact toughness. Q620FTD has same strength but only -20°C impact. Q690FTE provides even higher strength for extreme arctic applications.

Technical Specifications

Q620FTE Chemical Composition (GB/T 28410-2012, wt%)

Element Value / Range
C (max) 0.20
Mn (max) 1.80
P (max) 0.020
S (max) 0.010
Si (max) 0.60
Nb (max) 0.070
V (max) 0.15
Ti (max) 0.050
Mo (max) 0.50
Cr (max) 0.80
Ni (max) 0.80
Cu (max) 0.80
Als (min) 0.015
N (max) 0.010
Note: Tighter P/S control for enhanced low-temperature toughness at -40°C. Higher alloy content for ultra-high strength.

Applications

Arctic Large Wind Turbine Towers (10MW+)

Primary application for Q620FTE, offering ultra-high strength (620MPa yield) and extreme -40°C impact toughness for large wind turbine tower structures in arctic and subarctic regions requiring maximum load-bearing capacity and cold resistance.

  • Tower shell sections for arctic and subarctic large wind farms
  • Flanges, ring stiffeners requiring -40°C impact certification at 620 MPa
  • Transition pieces for tall towers in extremely cold environments
  • Offshore wind projects in polar seas demanding highest strength and cold resistance

Available Supply Range

📏 Thickness

  • Plates: 8-120mm
  • Coils: 2.0-12.0mm

📐 Width & Length

  • Width: 900-5300mm
  • Length: 6000-12000mm
Lead Time: 40-60 days for arctic-grade ultra-high-strength steel

Custom Fabrication Services

Custom Cutting

Edge Beveling

Drilling & Punching

Bending & Forming

Quality & Manufacturing Assurance

ISO 9001:2015
CE Marking
SGS/BV/TÜV

Packaging & Logistics

  • Bundled with steel straps on wooden skids
  • Marking: Grade, size, heat number, weight, impact grade E (-40°C)
  • FOB/CIF/CFR from main Chinese ports

Frequently Asked Questions

Q620FTE vs Q620FTD?

Q620FTE: -40°C impact (34J), Q620FTD: -20°C impact (47J). Q620FTE for arctic conditions.

International equivalents?

EN S690 series only guarantees to -20°C. Q620FTE is a specialized extreme low-temperature steel.

Third-party inspection for -40°C?

Yes, SGS, BV, TÜV available including -40°C impact verification.

Request a Quotation

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