Q690FTD Wind Power Steel

Ultra-High-Strength Grade – 690MPa Yield, Guaranteed -20°C Impact Toughness (47J) for Mega Wind Turbine Towers

📏 Standard: GB/T 28410-2012
🏗️ Mega Wind Turbine Towers
💪 Yield ≥690MPa

Product Overview

This article introduces Q690FTD 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. Q690FTD provides 690 MPa minimum yield, excellent toughness at -20°C (Grade D) with 47J guaranteed impact energy, and complies with GB/T 28410-2012 for high-strength wind tower construction in moderate cold climates.

Q690FTD is an ultra-high-strength low-alloy structural steel plate specifically designed for next-generation mega wind power generation equipment requiring maximum load-bearing capacity and reliable low-temperature toughness.

Key Advantages

  • Ultra-High Strength + Low-Temperature Toughness: 690MPa yield combined with guaranteed -20°C impact toughness (47J).
  • Optimized for Mega Turbines: Designed for next-generation mega wind towers requiring maximum load-bearing capacity.
  • Excellent Weldability: Optimized chemical composition with low carbon equivalent ensures reliable fabrication.
  • Cost-Effective Solution: Ultra-high strength enables significant weight reduction for 15MW+ turbines.

Domestic Grade Comparison: Q620FTD / Q690FTE

Q620FTD
Impact: -20°C

Yield: ≥620MPa

Tensile: 710-880MPa

Impact: 47J

Q690FTD ★
Impact: -20°C

Yield: ≥690MPa

Tensile: 770-940MPa

Impact: 47J

Q690FTE
Impact: -40°C

Yield: ≥690MPa

Tensile: 770-940MPa

Impact: 34J

Note: Q690FTD offers ultra-high yield strength (690MPa) with -20°C impact toughness (47J). Q620FTD has lower strength, and Q690FTE provides the same strength with -40°C impact for arctic conditions.

Technical Specifications

Q690FTD 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) 0.050
Cr (max) 0.80
Ni (max) 0.80
Cu (max) 0.80
Als (min) 0.015
N (max) 0.012
Note: Lower limit of Mn for normalized delivery as specified. Higher alloy content for ultra-high strength.

Applications

Next-Generation Mega Wind Turbine Towers (15MW+)

Primary application for Q690FTD, offering ultra-high strength (690MPa yield) and -20°C impact toughness for the next generation of mega wind turbine tower structures requiring maximum load-bearing capacity and reliable low-temperature performance.

  • Heavy-duty tower shell sections for next-generation mega wind turbines (15MW+)
  • Flanges, ring stiffeners, connection brackets requiring 690 MPa yield
  • Transition pieces and bottom sections for tallest towers (160m+ hub height)
  • Offshore wind power projects demanding maximum strength

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 ultra-high-strength grade

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 D (-20°C)
  • FOB/CIF/CFR from main Chinese ports

Frequently Asked Questions

Q690FTD vs Q620FTD?

Q690FTD has higher yield strength (690MPa vs 620MPa) and higher tensile strength (770-940MPa vs 710-880MPa), suitable for next-generation mega wind turbines.

Q690FTD vs Q690FTE?

Q690FTD: -20°C impact (47J), Q690FTE: -40°C impact (34J). Q690FTD for moderate cold, Q690FTE for arctic conditions.

Third-party inspection?

Yes, SGS, BV, TÜV available including -20°C impact verification.

Request a Quotation

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