Q620FTD Ultra‑High Strength Wind Power Steel

GB/T 28410-2012 | 620MPa Grade | -20°C Impact (47J) for heavy‑duty wind turbines

📏 Standard: GB/T 28410-2012
🏗️ Next‑gen large turbines
❄️ -20°C Impact 47J (Grade D)
💪 Yield ≥620 MPa (≤40mm)

Product Overview

This article introduces Q620FTD 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. Q620FTD is a high‑strength low‑alloy steel plate offering minimum yield strength of 620 MPa (≤16mm), excellent toughness at -20°C (Grade D, 47J), and complies with GB/T 28410‑2012 for wind tower construction in demanding environments requiring ultra‑high load capacity.

📊 Q620FTD Approximate Grade Lookup Table

Key Advantages

  • 620MPa Ultra‑High Strength: Minimum yield 620 MPa (≤40mm) for next‑generation large wind turbines and heavy‑load tower designs.
  • Enhanced -20°C Impact Toughness: Minimum 47J at -20°C (Grade D) – superior reliability for cold climate zones.
  • Optimized Alloy Design: Controlled micro‑alloying (Nb, V, Ti) plus Mo, Cr, Ni for excellent strength and weldability.
  • Low Impurity Content: P≤0.020, S≤0.010 for improved low‑temperature performance and cleanliness.
  • Weldable Fine‑Grain Steel: Low carbon equivalent design suitable for field welding of tower sections.

Technical Specifications

Q620FTD Chemical Composition (GB/T 28410-2012, mass fraction %)

Element Q620FT D (max or range)
Grade Q620FT D
C (max) 0.20
Mn ≤1.80 (lower limit for normalized*)
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) 0.55
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. No lower limit required for other conditions.

Quality & Manufacturing Assurance

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Modern Production

Advanced continuous casting and controlled rolling for ultra‑high strength

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In-process Inspection

Spectral analysis, UT testing, -20°C impact verification

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Full Documentation

MTC EN 10204 3.1/3.2 with 620MPa grade results

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: 28-38 days after order confirmation (depending on QT requirement).

Request a Quotation

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Frequently Asked Questions

What is the advantage of Q620FTD over Q550FTD?

Q620FTD provides significantly higher strength (620 MPa yield vs 550 MPa) while maintaining good -20°C impact toughness (47J vs 34J), allowing for lighter tower sections or higher load capacity in the same thickness.

Is Q620FTD suitable for offshore wind?

Yes, its high strength and -20°C impact toughness meet requirements for many offshore wind projects in temperate and cold seas. For arctic offshore, consider Q620FTE (-40°C).

What is the typical delivery condition for Q620FTD?

It is commonly delivered in Quenched + Tempered (QT) or TMCP to achieve the 620MPa yield strength and 47J impact energy at -20°C.

Third-party inspection available?

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

For immediate inquiries, contact via WhatsApp. For detailed specs, visit the product page.
✅ Q620FTD (Grade D, -20°C impact, 47J) · Yield 620/620/600 MPa · GB/T 28410-2012 · Mill certificate included