42CrNiMo,18CrNiMo7-6 Free Forging forged hollow tubes
Premium 42CrNiMo and 18CrNiMo7-6 Forged Hollow Tubes via Free Forging Process
We specialize in manufacturing high-quality forged hollow tubes using advanced free forging technology, with materials such as 42CrNiMo and 18CrNiMo7-6. These alloy steels are renowned for their outstanding strength, impact resistance, and fatigue performance, making them ideal for use in high-load industrial applications.
Precision Engineering for Demanding Applications
Our forged hollow tubes are widely used in wind turbine components, heavy-duty gearboxes, oil & gas equipment, and marine shafts. The free forging process ensures excellent metallurgical structure, uniform grain flow, and superior toughness. We can produce custom dimensions with or without inner bore machining, meeting exact customer specifications.
Strict Quality Control and International Standards
Each forged hollow tube is subjected to rigorous ultrasonic testing according to EN10228-3 or customer-specified standards. Our production process includes normalization, quenching & tempering, and accurate dimensional control. We are ISO9001, ISO14001, and ISO45001 certified, ensuring reliability and traceability throughout the production chain.
Your Reliable Partner for Forged Hollow Solutions
With over 25 years of forging experience, we deliver robust and cost-effective hollow forged tubes for global OEMs and engineering projects. Whether you need one-off prototypes or mass production runs, our engineering team provides technical support and on-time delivery you can count on.
Key Features:
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Materials: 42CrMo / 42CrNiMo
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Forging Type: Free Forged / Open Die Forged
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Applications: Wind turbine planetary gear systems, heavy-duty industrial gearboxes
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Heat Treatment: Normalizing + Tempering / Quenching + Tempering
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Custom machining and non-destructive testing available on request
Our forged planetary gear step shafts meet international quality standards, with strict dimensional control, ultrasonic testing, and surface treatment to ensure performance and reliability. With fast delivery and stable quality, we are a trusted supplier for leading wind energy equipment manufacturers.
42CrMo Free Forged Planetary Gear Shaft for Heavy-Duty Transmission Systems. Our 42CrMo free forged planetary gear shafts are designed for high-performance transmission systems operating under heavy loads, high torque, and continuous duty cycles. Manufactured through precision open-die forging and heat treatment, these shafts offer superior strength, toughness, and dimensional stability essential for critical powertrain components.
| Item |
Details |
| Product Name |
42CrMo,42CrNiMo Free Forged Planetary Gear step Shaft for Wind Power Turbines |
| Material Grades |
- Alloy steel: 42CrMo - Provides high tensile strength, good hardenability, and excellent fatigue resistance under continuous high-load operation |
| Forging Equipment |
- Hydraulic hammers: 5T / 8T / 12T - 3600T open-die forging press for long or stepped shaft forgings - Capable of forming precise shaft profiles including stepped ends, flanges, splines, and keyways |
| Manufacturing Process |
Hot Forging → Heat Treatment (Quenching + Tempering / Normalizing) → Ultrasonic Testing → Rough / Semi-Finish Machining → Final Dimensional Inspection |
| Forging Ratio |
≥ 3.0 — Enhances grain flow alignment along shaft axis for increased impact resistance, torsional strength, and long-term durability |
| Applications |
- Planetary gear shafts in wind turbine main gearboxes - Drive shafts for mining, construction, and industrial machinery - Transmission shafts in metallurgical and heavy transport systems |
| Heat Treatment Options |
- Quenched + Tempered for high strength and fatigue resistance in dynamic torque transmission - Normalizing for improved grain refinement and dimensional control - Optional stress relief to reduce residual stresses before final machining |
| Testing & Inspection |
- Chemical: Composition analysis via spectrometer - Mechanical: Tensile strength, yield strength, hardness, and Charpy impact tests (longitudinal & transverse) - Ultrasonic Testing (UT): 100% internal flaw detection - Dimensional: Runout, straightness, diameter tolerance, and surface roughness control |
| Value-Added Services |
- Pre-machining of splines, gear ends, keyways, and journals - Surface finish customization and anti-corrosion protection - Export packaging for long-distance shipment - Full material traceability: heat number, batch number, and certified mechanical & NDT reports |
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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