Q550FTD High‑Strength Wind Power Steel

GB/T 28410-2012 | 550MPa Grade | -20°C Impact (34J) for cold climate turbines

📏 Standard: GB/T 28410-2012
🏗️ Heavy‑duty cold‑climate towers
❄️ -20°C Impact 34J (Grade D)
💪 Yield ≥550 MPa (≤16mm)

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 550 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 Approximate Grade Lookup Table

Key Advantages

  • 550MPa Grade Strength: Minimum yield 550 MPa (≤16mm) for heavy‑load and tall tower designs.
  • Guaranteed -20°C Impact Toughness: Minimum 34J at -20°C (Grade D) – reliable for cold regions.
  • Enhanced Alloy Design: Higher Mn (≤1.80), Mo (≤0.50), Cr (≤0.80), Ni (≤0.80) for improved strength and hardenability.
  • Superior Purity: Low P (≤0.020) and S (≤0.010) for enhanced low‑temperature performance.
  • Optimized Weldability: Low carbon (C≤0.20) and micro‑alloying (Nb, V, Ti) for excellent field welding.

Technical Specifications

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

Element Q550FT D (max or range)
Grade Q550FT D
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: The lower limit of Mn content for normalized delivery shall be as specified. No lower limit required for other conditions.

Quality & Manufacturing Assurance

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Modern Production

Advanced continuous casting and controlled rolling

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In-process Inspection

Spectral analysis, UT testing

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Full Documentation

MTC EN 10204 3.1/3.2

ISO 9001:2015 CE Marking (PED) SGS Inspection Mill Certificate 3.1

Packaging & Logistics

  • Standard Packaging: Steel plates bundled with steel straps on wooden skids. Coils wrapped with waterproof paper.
  • Marking: Grade, size, heat number, weight clearly marked.
  • Logistics: FOB, CIF, CFR from main Chinese ports.
  • Lead Time: 25-35 days after order confirmation.

Request a Quotation

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Frequently Asked Questions

What is the advantage of Q550FTD over Q460FTD?

Q550FTD offers higher strength (550 MPa yield up to 40mm vs. 460 MPa) while maintaining the same -20°C impact toughness (34J). This allows for lighter tower sections under higher loads.

Is Q550FTD suitable for offshore wind in cold seas?

Yes, -20°C impact meets requirements for many North Sea, Baltic, and cold offshore projects. For arctic offshore, consider Q550FTE (-40°C) or Q550FTF (-50°C).

What is the MOQ for Q550FTD plates?

25MT for plates, 50MT for coils. Trial orders (10-15MT) may be accepted after discussion.

Third-party inspection available?

SGS, BV, TÜV inspection can be arranged at extra cost; mill certificate EN 10204 3.1 is always included.

For immediate inquiries, contact via WhatsApp. For detailed specs, visit the product page.
✅ Q550FTD (Grade D, -20°C impact, 34J) · Yield 550/550/530 MPa · GB/T 28410-2012 · Mill certificate included