Q420FTC Wind Power Steel

High-Strength Grade – 420MPa Yield, Guaranteed 0°C Impact Toughness (47J) for Large Wind Turbine Towers

📏 Standard: GB/T 28410-2012
🏗️ Mega Wind Turbine Towers
💪 Yield ≥420MPa

Product Overview

This article introduces Q420FTC 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. Q420FTC is a high-strength low-alloy steel plate offering 420 MPa minimum yield, excellent toughness at 0°C (Grade C), and complies with GB/T 28410-2012 for wind tower construction requiring higher load capacity.

Q420FTC is a high-strength low-alloy structural steel plate specifically designed for large wind power generation equipment requiring superior load-bearing capacity, complying with GB/T 28410-2012.

Key Advantages

  • Very High Strength: Minimum yield strength of 420MPa enables significantly lighter tower designs and reduced material consumption for mega turbines.
  • Guaranteed Toughness: Impact toughness guaranteed at 0°C (47J) for reliable performance in temperate climates.
  • Excellent Weldability: Optimized chemical composition with low carbon equivalent ensures ease of fabrication.
  • Cost-Effective Solution: Higher strength allows for thinner sections, reducing overall tower weight and transportation costs.

International Grade Comparison

🇨🇳 Q420FTC (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: 0°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: JR=20°C / J0=0°C / J2=-20°C
Functional Equivalent: Q420FTC ≈ S420J0 (0°C impact)
Note: Q420FTC is designed for high-strength wind power applications. EN S420J0 offers similar 0°C impact properties with comparable strength levels.

Domestic Grade Comparison: Q345FTC / Q460FTC

Q345FTC
Impact: 0°C

Yield: ≥345MPa

Tensile: 470-630MPa

Impact Energy: 47J

Q420FTC ★
Impact: 0°C

Yield: ≥420MPa

Tensile: 520-680MPa

Impact Energy: 47J

Q460FTC
Impact: 0°C

Yield: ≥460MPa

Tensile: 550-720MPa

Impact Energy: 47J

Note: Q420FTC offers higher yield strength (420MPa) than Q345FTC while maintaining 0°C impact toughness. Q460FTC provides even higher strength (460MPa) with 0°C impact for the largest turbine applications.

Technical Specifications

Q420FTC Chemical Composition (GB/T 28410-2012, wt%)

Element / Parameter Grade: Q420FT Class: C
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: The lower limit of Mn content for steel plates delivered in normalized condition shall be as specified in the table.

Applications

Mega Wind Turbine Towers

Primary application for Q420FTC, offering very high strength (420MPa yield) and 0°C impact toughness for large wind turbine tower structures requiring superior load-bearing capacity. Ideal for tall towers (100m+ hub height) and large-capacity turbines.

  • Tower shell sections for large-capacity wind turbines requiring higher strength
  • Flanges, ring stiffeners, connection brackets for heavy-load designs
  • Transition pieces and bottom sections for tall towers (100m+ hub height)
  • Onshore and offshore wind power projects demanding 420 MPa yield strength

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 high-strength 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 C (0°C).
  • Lead Time: Typically 35-50 days after order confirmation for high-strength grade.

Frequently Asked Questions

What is the difference between Q420FTC and Q345FTC?

Q420FTC has higher yield strength (420MPa vs 345MPa) and higher tensile strength (520-680MPa vs 470-630MPa), making it suitable for very large wind turbines and taller towers requiring superior load capacity.

What are the international equivalents of Q420FTC?

Q420FTC is comparable to EN 10025-2 S420 series (S420JR/S420J0/S420J2), depending on impact temperature requirements.

Do you offer third-party inspection?

Yes, SGS, BV, TÜV available for pre-shipment inspection and mechanical testing verification.

Request a Quotation

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