Large Alloy Steel Open Die Forgings for Wind Turbine Main Shaft Applications. Our Large Alloy Steel Open Die Forgings are specifically engineered for wind turbine main shaft applications, offering exceptional performance under high torsional loads and fluctuating environmental conditions. Manufactured from high-strength alloy steels such as 42CrMo4, 18CrNiMo7-6, or customer-specified grades, these forgings exhibit excellent toughness, fatigue resistance, and dimensional stability.
Produced using open die forging with Electrohydraulic hammer , each piece is heat treated and rough according to customer specifications. The typical forging ratio ≥ 3.0 ensures uniform grain flow and improved internal integrity, essential for the demanding lifecycle of offshore and onshore wind turbines.
Key Features
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Material Options: Premium alloy steels tailored for high load and fatigue performance
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Max Size: Outer diameter up to 3000 mm, single-piece weight up to 12 tons
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Forging Process: Open die forging → Heat treatment → Machining → NDT
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Mechanical Properties: High tensile strength, impact toughness, and torsional resistance
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Delivery Condition: As-forged, rough-machined, or fully finished as required
Applications
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Main shafts in onshore and offshore wind turbine gearboxes
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Hub connections and structural support forgings in large wind systems
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Other large rotary components exposed to cyclic stress and harsh environments
| Item | Details |
| Product Name | Large Alloy Steel Open Die Forgings for Wind Turbine Main Shaft Applications |
| Material Grades | - Alloy steels such as 42CrMo4, or customized grades designed for main shaft performance in wind turbines |
| Forging Equipment | - Hydraulic Hammers: 5T, 8T, 12T - Capable of open die forging for extra-large shafts |
| Manufacturing Process | Raw Material Inspection → Unloading → Preheating → Open Die Forging → Heat Treatment → Rough Machining → NDT → Final Machining (if required) → Dimensional Inspection → Packaging → Delivery |
| Forging Ratio | ≥ 3.0 — Improves internal structure, directional grain flow, and overall fatigue resistance of the shaft during long-term turbine operation |
| Applications | - Main shafts in onshore and offshore wind turbines - Rotor hub connection forgings - Large structural rotary components exposed to variable torque and axial loads |
| Delivery Conditions | - Normalized + Tempered for improved toughness and structural reliability - Optional annealing available based on downstream processing and machining needs |
| Testing & Inspection | - Chemical Analysis via Optical Emission Spectrometry - Mechanical Testing: Tensile, Impact, Hardness - Non-Destructive Testing: Ultrasonic (UT), Magnetic Particle (MT) - Dimensional and shape inspections using precision metrology tools |
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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