Q550FTD Wind Power Steel

High-Strength Low-Temperature Grade – 550MPa Grade / 460MPa Yield, Guaranteed -20°C Impact Toughness (34J) for Cold Climate Large Wind Towers

📏 Standard: GB/T 28410-2012
🏗️ Cold Climate Large Wind Towers
❄️ Impact -20°C / 34J

Product Overview

This article introduces Q550FTD 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. Q550FTD is a high-strength low-alloy steel plate offering minimum yield strength of 460 MPa (≤16mm), excellent toughness at -20°C (Grade D, 34J), and complies with GB/T 28410-2012 for wind tower construction in cold environments requiring enhanced load capacity.

Q550FTD 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, complying with GB/T 28410-2012.

Key Advantages

  • High Strength + Low-Temperature Toughness: Minimum yield strength of 460MPa (≤16mm) combined with guaranteed -20°C impact toughness (34J).
  • Optimized for Cold Climates: Designed for large wind towers operating in winter-cold regions where low-temperature performance is critical.
  • Excellent Weldability: Optimized chemical composition with low carbon equivalent ensures reliable fabrication.
  • Cost-Effective Solution: High strength allows for lighter tower designs, reducing material and transportation costs.

International Grade Comparison

🇨🇳 Q550FTD (GB/T 28410-2012)
C: ≤0.20%
Mn: ≤1.80%
P: ≤0.020%
S: ≤0.010%
Si: ≤0.60%
Als: ≥0.015%
Yield: ≥460MPa (≤16mm)
Impact: -20°C (34J)
🇪🇺 EN 10025-2 S550 Series
C: ≤0.20%
Mn: ≤1.80%
P: ≤0.035%
S: ≤0.035%
Si: ≤0.60%
N: ≤0.012%
Yield: ≥550MPa
Impact: JR=20°C / J0=0°C / J2=-20°C
Functional Equivalent: Q550FTD ≈ S550J2 (-20°C impact)
Note: Q550FTD combines high strength with -20°C impact toughness. EN S550J2 offers similar -20°C impact properties with comparable strength levels.

Domestic Grade Comparison: Q460FTD / Q620FTD

Q460FTD
Impact: -20°C

Yield: ≥420MPa

Tensile: 550-720MPa

Impact: 47J

Q550FTD ★
Impact: -20°C

Yield: ≥460MPa

Tensile: 670-830MPa

Impact: 34J

Q620FTD
Impact: -20°C

Yield: ≥550MPa

Tensile: 700-880MPa

Impact: 34J

Note: Q550FTD offers high yield strength (460MPa) with -20°C impact toughness. Q460FTD has lower strength but higher impact energy (47J). Q620FTD provides even higher strength for extreme applications.

Technical Specifications

Q550FTD Chemical Composition (GB/T 28410-2012, wt%)

Element Value / Range
C (max) 0.20
Mn ≤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) 0.012
Note: Higher alloy content (Cr, Ni, Mo) for enhanced strength and hardenability.

Applications

Cold Climate Large Wind Turbine Towers

Primary application for Q550FTD, offering high strength (460MPa yield) and -20°C impact toughness for large wind turbine tower structures in cold climate regions requiring superior load-bearing capacity and low-temperature reliability.

  • Tower shell sections for large wind turbines in cold climate zones
  • Flanges, ring stiffeners, connection brackets requiring -20°C toughness at high strength
  • Transition pieces and bottom sections for tall towers in low-temperature regions
  • Onshore and offshore wind power projects demanding reliable performance at -20°C

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 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

Q550FTD vs Q460FTD?

Q550FTD has higher strength (460MPa yield vs 420MPa yield for Q460FTD in thin gauge) and higher tensile strength (670-830MPa vs 550-720MPa).

International equivalents?

Comparable to EN 10025-2 S550J2 (-20°C impact).

Third-party inspection?

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

Request a Quotation

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