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:

• High Mechanical Performance: Both 42CrMo4 and 18CrNiMo7-6 offer excellent fatigue resistance, impact toughness, and long-term durability.

• 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.

• Forging Advantages: Open-die forging ensures refined grain flow along the shaft axis, minimizing internal stress and enhancing mechanical reliability.

• 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:

• 42CrMo4 Wind Turbine Main Shaft — for applications requiring core strength, uniform mechanical properties, and dimensional stability.

• 18CrNiMo7-6 Wind Turbine Main Shaft — ideal for case-hardened components where surface wear resistance and internal ductility are critical.

• Integrated Rotor Shafts — with custom spline, flange, and keyway features for direct rotor-hub connection.

• Double-End Bearing Shafts — for gearbox mounting or generator-side support with precision-machined journal ends.

• Hollow or Solid Forged Shafts — designed based on load conditions, weight optimization, and dynamic balance requirements.

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.

About CHANGZHOU TIANGONG 

We are a Chinese company with over 30 years of forging experience. Our focus lies in the production of machine free forged products. We take pride in our independent quality assurance laboratory, which ensures that all our products meet our customers’ requirements. 

Our customers and partner value our products and services for 2 reasons: excellence and reliability.

Key figures 

A. Over 30 years professional free forging manufacturing experience

B. The company covers an area of 71,000 square meters

C. The construction area of the production workshop is 12,000 square meters

D. Total number of employees of 158

E. 28 engineering and technical personnel 

F. 59 skilled workers 

G. Annual production capacity is 38,000 tons

H. Steel throughput can reach 56,000 tons

Efficient and reliable solutions for customers

Industrial sector application

We design and manufacture forged parts for all industrial areas applying our experience and unique professionalism and taking the specific requirements of the markets into account. This has led us to become a forging industry leader in all industrial segments and collaborating with leading companies.

A. Wind power generation

B. Port Heavy Machinery

C. Mining

D. Ship Building

E. Chemical industrial

F. Oil industrial

G. Metallurgical industry 

H. Hydraulic industry 

I. Other high-end industrial equipment, gearbox body, parts and etc.

Customized solutions 

Modular processes allow us to engineer a solution for almost every industrial application requiring free forged parts. Our modularity means flexibility, a wide range of options, faster delivery, and most important of all, competitiveness.

All our products and production process have been designed to assure excellent, reliable and long lasting unique mechanical performances, resulting in reduced operating costs and long life.

With a wide range of products and a significant experience gained in most industrial applications, we can also provide complete engineering recommendation for customers.