42CrMo4 18CrNiMo7-6 Wind Turbine Main Shaft Free Forging
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 |
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