42CrMo4 18CrNiMo7-6 Wind Turbine Main Shaft Free Forging.The 42CrMo4 18CrNiMo7-6 Wind Turbine Main Shaft Free Forging is engineered for high strength and excellent toughness, making it ideal for demanding wind power applications. Manufactured through open-die forging, this shaft features uniform grain flow and superior mechanical properties. The 42CrMo4 18CrNiMo7-6 alloy steel provides high fatigue resistance, good hardenability, and enhanced tensile strength, ensuring reliable performance under cyclic loading conditions typical in wind turbine operation.
What it is:
The Wind Turbine Main Shaft Free Forging is a large-scale, high-strength forged component designed to transmit torque from the rotor hub to the drivetrain in horizontal-axis wind turbines. Forged from premium alloy steels like 42CrMo4 and 18CrNiMo7-6, it plays a vital role in maintaining structural integrity and rotational stability under dynamic wind loads.
Key Features:
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High Mechanical Performance: Both 42CrMo4 and 18CrNiMo7-6 offer excellent fatigue resistance, impact toughness, and long-term durability.
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Tailored Heat Treatment: 42CrMo4 is suited for quenching and tempering, ensuring through-hardening strength, while 18CrNiMo7-6 allows deep case hardening for surface wear resistance with a tough core.
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Forging Advantages: Open-die forging ensures refined grain flow along the shaft axis, minimizing internal stress and enhancing mechanical reliability.
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Customizable Geometry: Shafts can be delivered as rough machined, semi-finished, or ready-for-final-machining with journal, shoulder, and flange sections prepared.
Available Types:
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42CrMo4 Wind Turbine Main Shaft — for applications requiring core strength, uniform mechanical properties, and dimensional stability.
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18CrNiMo7-6 Wind Turbine Main Shaft — ideal for case-hardened components where surface wear resistance and internal ductility are critical.
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Integrated Rotor Shafts — with custom spline, flange, and keyway features for direct rotor-hub connection.
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Double-End Bearing Shafts — for gearbox mounting or generator-side support with precision-machined journal ends.
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Hollow or Solid Forged Shafts — designed based on load conditions, weight optimization, and dynamic balance requirements.
| Item | Details |
| Product Name | 42CrMo4 18CrNiMo7-6 Wind Turbine Main Shaft Free Forging |
| Material Grades | - Premium alloy steels: 42CrMo4, 18CrNiMo7-6 - High tensile strength, excellent fatigue resistance, and impact toughness - Suitable for large rotary load-bearing components in wind turbine drivetrains |
| Forging Equipment | - Hydraulic hammers: 5T / 8T / 12T - 3600T open-die forging press with deep axial piercing capability - Capable of forging large-diameter shafts with superior grain flow |
| Manufacturing Process | Hot Forging → Heat Treatment → Ultrasonic Testing → Rough / Semi-Finish Machining → Dimensional & Surface Inspection |
| Forging Ratio | ≥ 3.0 — Ensures directional grain flow for enhanced fatigue performance and structural integrity under bending and torsional loads |
| Applications | - Main shafts for horizontal-axis wind turbines - Integrated shafts for yaw and pitch systems - Drive shafts in high-capacity wind gearboxes |
| Heat Treatment Options | - Quenched + Tempered for 42CrMo4: achieves core strength & ductility - Carburizing preparation for 18CrNiMo7-6: suitable for case hardening - Optional stress relieving before finish machining |
| Testing & Inspection | - Chemical: Spectrometer-controlled alloy analysis - Mechanical: Hardness, tensile, yield, Charpy impact (longitudinal & transverse) - Ultrasonic (UT): 100% full-length, multi-angle shaft scanning - Dimensional: Straightness, coaxiality, journal diameter, overall length |
| Value-Added Services | - Pre-machining for journals, shoulders, and bearing seats - Stress relief or carburizing-ready heat treatment - Rust-proof packaging, end cap protection, steel banding - Traceability: Heat number, forging batch |
The steel forgings production flow:
Raw material steel ingot into warehouse(test the chemical composition) → Cutting→ Heating(Furnace temperature test) → Heat treatment after forging(Furnace temperature test) Discharge the furnace(blank inspection)→ Machining→ Inspection(UT,MT,Visal dimension, hardness)→ QT→ Inspection(UT, mechanical properties, hardness, grain size)→ Finish machining→ Inspection (dimension)→ Packing and Marking(steel stamp, mark)→ Storage Shipment.
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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42CrMo4 18CrNiMo7-6 Wind Turbine Main Shaft Free Forging Images
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