Q690FTE Wind Power Steel

GB/T 28410-2012 | 690MPa Grade | -40°C Impact (34J) for extreme cold climate heavy‑duty turbines

📏 Standard: GB/T 28410-2012
🏗️ Arctic offshore towers
❄️ -40°C Impact 34J (Grade E)
💪 Yield ≥690 MPa (≤40mm)

Product Overview

This article introduces Q690FTE 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. Q690FTE is a high‑strength low‑alloy steel plate offering minimum yield strength of 690 MPa (≤16mm), excellent low‑temperature toughness at -40°C (Grade E, 34J), and complies with GB/T 28410‑2012 for wind tower construction in extremely cold environments requiring ultra‑high load capacity.

📊 Q690FTE Approximate Grade Lookup Table

Key Advantages

  • 690MPa Extra‑High Strength: Minimum yield 690 MPa (≤40mm) for next‑generation large wind turbines and heavy‑load tower designs, enabling significant weight reduction.
  • Guaranteed -40°C Impact Toughness: Minimum 34J at -40°C (Grade E) – reliable for arctic and subarctic regions.
  • Optimized Alloy Design: Controlled micro‑alloying (Nb, V, Ti) plus Mo (≤0.50), Cr, Ni for excellent strength, low‑temperature toughness and weldability.
  • Low Impurity Content: P≤0.020, S≤0.010, N≤0.010 for enhanced low‑temperature performance and cleanliness.
  • Weldable Fine‑Grain Steel: Low carbon equivalent design suitable for field welding of heavy tower sections in cold environments.

Technical Specifications

Q690FTE Chemical Composition (GB/T 28410-2012, mass fraction %)

Element Q690FT E (max or range)
Grade Q690FT E
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) 0.80
Als (min) 0.015
N (max) 0.010
Note: The lower limit of Mn content for steel plates delivered in normalized condition 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 for extra‑high strength & low temp

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In-process Inspection

Spectral analysis, UT testing, -40°C impact verification

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Full Documentation

MTC EN 10204 3.1/3.2 with -40°C impact 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: 30-40 days after order confirmation (depending on QT requirement).

Request a Quotation

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Frequently Asked Questions

What is the advantage of Q690FTE over Q690FTD?

Q690FTE provides guaranteed -40°C impact toughness (34J) compared to -20°C for Q690FTD (47J), making it suitable for arctic and extremely cold climates while maintaining 690MPa yield strength.

Is Q690FTE suitable for offshore wind in arctic seas?

Yes, its -40°C impact toughness meets requirements for arctic offshore projects. For deeper arctic, consider Q690FTF (-50°C) if available.

What is the typical delivery condition for Q690FTE?

It is commonly delivered in Quenched + Tempered (QT) or TMCP to achieve the 690MPa yield strength and 34J impact energy at -40°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 -40°C impact test results.

For immediate inquiries, contact via WhatsApp. For detailed specs, visit the product page.
✅ Q690FTE (Grade E, -40°C impact, 34J) · Yield 690/690/670 MPa · GB/T 28410-2012 · Mill certificate included