18CrNiMo7-6 Fatigue-Resistant Alloy Steel Forgings for Wind Turbine Shafts are engineered to deliver outstanding performance under extreme cyclic loading conditions. Utilizing the premium-grade low-carbon alloy steel 18CrNiMo7-6, these forgings exhibit exceptional toughness, core strength, and fatigue resistance — ideal for the demanding load spectra found in wind turbine main shafts and rotor hubs.
The forging process incorporates controlled open-die forging techniques to ensure optimal grain orientation along the shaft’s load path, significantly enhancing the fatigue life and structural integrity of the component. Advanced quenching and tempering heat treatments are applied to achieve a refined microstructure, balanced mechanical properties, and uniform hardness across the section.
Each forging undergoes rigorous non-destructive and dimensional inspections, ensuring zero internal flaws and tight dimensional tolerances required for precision-fit assemblies. Custom machining, anti-corrosion surface treatments, and certified traceability can be provided to meet specific project needs.
| Item | Details |
| Product Name | 18CrNiMo7-6 Fatigue-Resistant Alloy Steel Forgings for Wind Turbine Shafts |
| Material Grades | - Primary alloy: 18CrNiMo7-6
- Superior fatigue resistance, impact toughness, and tensile strength
- Engineered for wind turbine shafts under extreme dynamic loading |
| Forging Equipment | - Hydraulic hammers: 5T / 8T / 12T
- Large open-die forging press with core boring capability
- Near-net shape forging for long shafts with solid or bored centers |
| Manufacturing Process | Hot Forging → Intermediate Heat Treatment → Optional Core Boring / Drilling →
Rough / Semi-Finish Machining → UT & Dimensional Inspection |
| Forging Ratio | ≥ 3.0 — Promotes directional grain flow along shaft axis, ensuring excellent
torque transmission and fatigue resistance in wind applications |
| Applications | - Wind turbine main shafts and gearbox transmission shafts
- Designed to withstand extreme torsional loads, bending stresses,
and cyclical dynamic forces in wind energy systems |
| Heat Treatment Options | -Annealing and tempering for fatigue-resistant microstructure
- Optional stress relief to maintain dimensional accuracy |
| Testing & Inspection | - Chemical: Spectrometer-controlled composition analysis
- Mechanical: Hardness, tensile, yield, impact toughness
- Ultrasonic (UT): Multi-angle flaw detection, including bore zone
- Dimensional: Length, diameter, straightness, concentricity |
| Value-Added Services | - Custom shaft geometries: shoulders, spline zones, flanges
- Pre-machined journals and stepped ends for gear integration
- Laser part marking and full traceability |
Key Features
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Material Advantage: Made from 18CrNiMo7-6 alloy steel, offering high core strength, superior toughness, and excellent hardenability.
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Fatigue Resistance: Optimized for high-cycle fatigue strength, making it ideal for wind turbine applications with dynamic load demands.
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Directional Grain Flow: Forged to ensure continuous, longitudinal grain flow aligned with shaft stress paths for improved durability.
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Heat Treatment: tempered to achieve uniform mechanical properties and increased resistance to wear and stress.
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Dimensional Precision: Capable of tight tolerances for seamless integration into main shaft assemblies.
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Quality Control: Full range of NDT (UT, MT) and mechanical testing to ensure internal soundness and reliability.
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Customizable: Available with semi-machined or fully-machined finishes, anti-corrosion coatings, and tailored end connections.
Application Scenarios
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Wind Turbine Main Shafts: Designed to endure variable wind loads, torque transfer, and long service cycles.
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Yaw and Pitch Drive Components: Suitable for structural parts under fluctuating torsional stresses.
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Offshore Wind Installations: Proven performance in harsh marine environments requiring high fatigue strength and corrosion tolerance.
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Renewable Energy Equipment: Critical rotating elements in sustainable power generation systems requiring long-term reliability.
The steel forgings production flow:
raw material inspection → unloading → inspection → preheating → forging → heat treatment → inspection → rough machining → non-destructive testing → inspection → packaging → delivery.
Frequently Asked Questions (FAQs)
1. What is your forging weight range?
We produce forged parts ranging from 100 kg to 7000 kg.
2. Do you provide heat treatment and machining?
Yes, we offer full in-house heat treatment, rough, and finish machining services.
3. Which industries do you supply to?
We serve wind energy, heavy equipment, port machinery, transmission systems, and more.
4. What is your production lead time?
With stock: Around 30 days
Without stock: 40–45 days
5. Where is your factory located?
In Changzhou City, near Shanghai, with shipping via Shanghai Port.
Request a Quote
Please send your technical drawings and requirements to us. Our engineers will review and provide you with a professional quotation and solution shortly.
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