Q345FTC Wind Power Steel

High-Strength Grade – 345MPa Yield, Guaranteed 0°C Impact Toughness (47J) for Large Wind Turbine Towers

📏 Standard: GB/T 28410-2012
🏗️ Large Wind Turbine Towers
💪 Yield ≥345MPa

Product Overview

This article introduces Q345FTC 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. Q345FTC provides 345 MPa minimum yield, excellent toughness at 0°C (Grade C), and complies with GB/T 28410-2012 for wind tower construction.

Q345FTC is a high-strength structural steel plate specifically designed for wind power generation equipment requiring higher load-bearing capacity, complying with the Chinese standard GB/T 28410-2012 (Wind turbine tower steel plate).

Key Advantages

  • Higher Strength: Minimum yield strength of 345MPa enables lighter tower designs and reduced material consumption for large 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

🇨🇳 Q345FTC (GB/T 28410-2012)
C: ≤0.20%
Mn: 0.90-1.65%
P: ≤0.025%
S: ≤0.015%
Si: ≤0.50%
Als: ≥0.015%
Yield: ≥345MPa (≤16mm)
Impact: 0°C (47J)
🇪🇺 EN 10025-2 S355 Series
C: ≤0.22%
Mn: ≤1.60%
P: ≤0.035%
S: ≤0.035%
Si: ≤0.55%
N: ≤0.012%
Yield: ≥355MPa
Impact: JR=20°C / J0=0°C / J2=-20°C
Functional Equivalent: Q345FTC ≈ S355J0 (0°C impact)
🇺🇸 ASTM A709 Gr.50 (A709Gr50)
C: ≤0.23%
Mn: 0.60-1.35%
P: ≤0.035%
S: ≤0.035%
Si: 0.15-0.40%
Cu: ≥0.20%
Yield: ≥345MPa (50ksi)
Tensile: ≥450MPa
Note: Q345FTC has specified 0°C impact (47J) for wind tower applications.
Note: Q345FTC is designed for higher-strength wind power applications. EN S355J0 offers similar 0°C impact properties. ASTM A709 Gr.50 is a bridge-grade steel with comparable strength but different impact requirements.

Domestic Grade Comparison: Q275FTC / Q420FTC

Q275FTC
Impact: 0°C

Yield: ≥275MPa

Tensile: 410-560MPa

Impact Energy: 47J

Q345FTC ★
Impact: 0°C

Yield: ≥345MPa

Tensile: 470-630MPa

Impact Energy: 47J

Q420FTC
Impact: 0°C

Yield: ≥420MPa

Tensile: 520-680MPa

Impact Energy: 47J

Note: Q345FTC offers higher yield strength (345MPa) than Q275FTC while maintaining 0°C impact toughness. Q420FTC provides even higher strength (420MPa) with 0°C impact for very large turbines.

Technical Specifications

Q345FTC Chemical Composition (GB/T 28410-2012, wt%)

Element / Parameter Grade: Q345FT Class: C
C (max) 0.20
Mn 0.90~1.65
P (max) 0.025
S (max) 0.015
Si (max) 0.50
Nb (max) 0.060
V (max) 0.12
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

Large Wind Turbine Towers

Primary application for Q345FTC, offering high strength (345MPa yield) and 0°C impact toughness for large wind turbine tower structures requiring superior load-bearing capacity. Ideal for onshore and offshore wind power projects.

  • Tower shell sections (cylindrical/conical) for onshore/offshore wind turbines
  • Flanges, ring stiffeners, connection brackets
  • Internal platforms, ladder supports, door frames
  • Transition pieces and bottom sections

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: Regular sizes in stock for quick delivery | Mill order: Custom sizes available with 30-45 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 30-45 days after order confirmation.

Frequently Asked Questions

What is the difference between Q345FTC and Q275FTC?

Q345FTC has higher yield strength (345MPa vs 275MPa) and higher tensile strength (470-630MPa vs 410-560MPa), making it suitable for larger wind turbines and heavier loads.

What are the international equivalents of Q345FTC?

Q345FTC is comparable to EN 10025-2 S355 series (S355JR/S355J0/S355J2) and ASTM A709 Gr.50, 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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