Q420FTD Wind Power Steel

High-Strength Low-Temperature Grade – 420MPa Yield, Guaranteed -20°C Impact Toughness (47J) for Cold Climate Mega Wind Towers

📏 Standard: GB/T 28410-2012
🏗️ Cold Climate Mega Wind Towers
❄️ Impact -20°C / 47J

Product Overview

This article introduces Q420FTD 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. Q420FTD is a high-strength low-alloy steel plate offering 420 MPa minimum yield, excellent toughness at -20°C (Grade D), and complies with GB/T 28410-2012 for wind tower construction in cold environments requiring higher load capacity.

Q420FTD is a high-strength low-alloy structural steel plate specifically designed for large wind power generation equipment requiring superior load-bearing capacity and low-temperature toughness.

Key Advantages

  • High Strength + Low-Temperature Toughness: 420MPa yield combined with -20°C impact (47J).
  • Optimized for Cold Climates: Designed for mega wind towers in winter-cold regions.
  • Excellent Weldability: Optimized chemical composition with low carbon equivalent.
  • Cost-Effective Solution: Higher strength allows for lighter tower designs.

International Grade Comparison

🇨🇳 Q420FTD (GB/T 28410-2012)
C: ≤0.20%
Mn: 1.00-1.70%
P: ≤0.025%
S: ≤0.015%
Si: ≤0.50%
Als: ≥0.015%
Yield: ≥420MPa (≤16mm)
Impact: -20°C (47J)
🇪🇺 EN 10025-2 S420 Series
C: ≤0.20%
Mn: ≤1.70%
P: ≤0.035%
S: ≤0.035%
Si: ≤0.50%
N: ≤0.012%
Yield: ≥420MPa
Impact: J2=-20°C
Functional Equivalent: Q420FTD ≈ S420J2
Note: Q420FTD combines high strength (420MPa) with -20°C impact toughness. EN S420J2 offers similar properties.

Domestic Grade Comparison: Q345FTD / Q420FTC / Q460FTD

Q345FTD
Impact: -20°C

Yield: ≥345MPa

Tensile: 470-630MPa

Impact: 47J

Q420FTC
Impact: 0°C

Yield: ≥420MPa

Tensile: 520-680MPa

Impact: 47J

Q420FTD ★
Impact: -20°C

Yield: ≥420MPa

Tensile: 520-680MPa

Impact: 47J

Q460FTD
Impact: -20°C

Yield: ≥460MPa

Tensile: 550-720MPa

Impact: 47J

Note: Q420FTD: 420MPa with -20°C impact. Q420FTC: same strength, 0°C only. Q460FTD: higher strength with -20°C.

Technical Specifications

Q420FTD Chemical Composition (GB/T 28410-2012, wt%)

Element Value
C (max) 0.20
Mn 1.00~1.70
P (max) 0.025
S (max) 0.015
Si (max) 0.50
Nb (max) 0.060
V (max) 0.15
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) 0.012
Note: Mn下限仅适用于正火交货条件。

Applications

Cold Climate Mega Wind Turbine Towers

High strength (420MPa) with -20°C impact toughness for large wind towers in cold regions.

  • Tower shell sections for cold climate mega turbines
  • Flanges and ring stiffeners requiring -20°C toughness
  • Transition pieces for tall towers (100m+ hub height)
  • Offshore wind projects in subzero conditions

Available Supply Range

📏 Thickness

  • Plates: 8-150mm
  • Coils: 2.0-12.0mm

📐 Width & Length

  • Width: 900-5300mm
  • Length: 6000-12000mm
Lead Time: 35-50 days for high-strength low-temperature grades

Custom Fabrication Services

Custom Cutting

Edge Beveling

Drilling & Punching

Bending & Forming

Quality 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

FAQ

Q420FTD vs Q420FTC?

Q420FTD: -20°C impact (47J), Q420FTC: 0°C impact (47J).

International equivalent?

Comparable to EN S420J2 (-20°C impact).

Third-party inspection?

Yes, SGS, BV, TÜV available.

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