Changzhou Tiangong Forging Co., Ltd.
Changzhou Tiangong Forging Co., Ltd.
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42CrMo, 18CrNiMo7-6, or 20CrMnTi High-Speed Transmission Shaft Free Forging. High-Speed Transmission Shaft Free Forging for Precision Powertrain and Drive Systems.The High-Speed Transmission Shaft Free Forging is a precision-engineered forged component designed for high-RPM powertrain and drive systems. Manufactured from premium alloy steels such as 42CrMo, 18CrNiMo7-6, or 20CrMnTi, this shaft forging delivers excellent rotational balance, surface hardness, and torsional strength under continuous high-speed loading conditions.
Engineered for superior fatigue resistance, dimensional stability, and minimal vibration, these forgings are ideal for use in turbo gearboxes, electric motor drive assemblies, rail transmission systems, and high-speed mechanical couplings. The directional grain flow achieved through open-die forging enhances mechanical integrity and operational life in critical transmission environments.
This product supports various post-forging services including spline machining, keyway broaching, stress-relief heat treatment, and precision grinding, ensuring full compatibility with OEM powertrain designs and performance standards.
Key features:
High fatigue resistance and torsional strength to withstand rapid cyclic loads
Superior dimensional stability and concentricity for high-speed rotation
Optimized grain flow for durability and long service life
Optional carburizing capability for hardened surfaces (especially with 18CrNiMo7-6, 20CrMnTi)
Available types include:
Spline shafts for gear couplings and reducers
Stepped shafts for speed-changing mechanisms
Hollow or solid transmission shafts for rail and industrial drives
Custom shafts with integrated shoulders, keyways, and journal seats
| Item | Details |
|---|---|
| Product Name | 42CrMo, 18CrNiMo7-6, or 20CrMnTi High-Speed Transmission Shaft Free Forging |
| Material Grades | - Precision-grade alloy steels:42CrMo, 18CrNiMo7-6, or 20CrMnTi - Optimized for high-speed rotation, low inertia, and thermal stability - Excellent tensile strength, fatigue life, and dimensional consistency |
| Forging Equipment | - Hydraulic hammers: 5T / 8T / 12T - 3600T open-die forging press suitable for long, slim, and spline shaft geometries - Capable of forming integrated keyways, shoulders, and journal zones |
| Manufacturing Process | Hot Forging → Quenching + Tempering / Normalizing → Ultrasonic Testing → Rough / Semi-Finish Machining → Dimensional & Surface Inspection |
| Forging Ratio | ≥ 3.0 — Promotes longitudinal grain alignment for increased fatigue resistance, torsional strength, and high-speed stability |
| Applications | - High-speed gearboxes and motor shafts - Rail transit propulsion systems - Precision couplings and turbine transmission assemblies - Automotive and industrial drive modules requiring low vibration and high reliability |
| Heat Treatment Options | - Quenched + Tempered for strength, ductility, and microstructure uniformity - Normalizing for dimensional stability before finishing - Optional stress relief to prevent distortion during machining |
| Testing & Inspection | - Chemical: Spectrometer-controlled alloy composition analysis - Mechanical: Hardness, tensile, yield strength, and axial/transverse impact testing - Ultrasonic (UT): 100% longitudinal scanning for internal flaws - Dimensional: Concentricity, straightness, journal tolerance, keyway accuracy, shaft runout |
| Value-Added Services | - Pre-machining: keyways, splines, shoulders, chamfers - Dynamic balancing upon request - Protective packaging for transport - Complete traceability: heat number, forging batch, inspection certification |
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.
Packaging & Delivery
Rust-preventive coating
Heavy-duty seaworthy wooden boxes
Custom labeling and barcoding
Global shipping support with flexible delivery terms (FOB, CIF, EXW)
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.