Marine & Offshore
🚢 Marine Propellers & Shafting
Large-diameter, complex blade curvature, tapered shaft with keyway, flanged couplings
What is Marine Propellers & Shafting?
🚢 Marine Propellers & Shafting represents a complete system of precision titanium components engineered for Marine & Offshore applications. Large-diameter, complex blade curvature, tapered shaft with keyway, flanged couplings The system integrates 3 distinct component types manufactured through 3 specialized processes.
Key manufacturing processes for this system include Ring forging radial-axial for propulsion geometry, CNC turn-bore operation with Class 6g gauge, TIG welding autogenous with Class 6g gauge, Hydrostatic pressure test with Class 6g gauge, CNC turn-bore operation with SPC sampling, each selected and qualified to meet component-specific requirements.
Engineering & Design Principles
Material: Grade 2 (CP-Ti) offers excellent seawater corrosion resistance (no pitting after years of immersion) at lower cost than Grade 5. Grade 5 for high-thrust propellers.
Form: Large propellers are investment cast or fabricated from welded plates. Shafting uses forged bar stock for strength and grain flow.
Standards & Material Specifications
Standards: ASTM B367 Grade C-2 (cast) / ASTM B348 Grade 2 (shaft), annealed, 100% FPI + balancing
Engineering Solution Blueprint
Marine Propellers & Shafting
Marine · Oil & Gas · Energy
1 Part Feature Analysis
Large-diameter, complex blade curvature, tapered shaft with keyway, flanged couplings
- ⚠️ Cavitation erosion
- ⚠️ Seawater corrosion fatigue
- ⚠️ Impact from debris
- ⚠️ Galvanic corrosion at shaft/propeller interface
2 Material Selection Rationale
Grade 2 CP-Ti — Industrial pure Ti, general corrosion resistance
Grade 2 (CP-Ti) offers excellent seawater corrosion resistance (no pitting after years of immersion) at lower cost than Grade 5. Grade 5 for high-thrust propellers.
3 Form Selection Rationale
Die Forging / Ring — for high-stress critical parts
Large propellers are investment cast or fabricated from welded plates. Shafting uses forged bar stock for strength and grain flow.
4 Manufacturing Process & Services
Core Processes:
Toll Processing Services:
Process Pitfalls:
- ⚠️ Cavitation damage on blade leading edges requires Stellite overlay welding every 5-10 years
- ⚠️ Shaft-to-propeller taper fit must be >85% contact verified by blueing
5 Procurement Specifications
ASTM B367 Gr2 cast / ASTM B348 Gr5 forged, 100% UT + MPI, dynamically balanced to G6.3
Manufacturing Process Flow
Simultaneous 5-axis CNC milling enables complex freeform geometries to be machined in a single setup, eliminating positional errors from multiple fixt
Professional manufacturing process for titanium components. Dynamic balancing is performed by certified technicians following approved procedures and
Gas Tungsten Arc Welding (GTAW/TIG) for titanium uses a non-consumable tungsten electrode with argon shielding at the torch face, trailing shield, and
Components in This System
| Component | Material |
|---|---|
| Titanium Propeller Hub Cap | Grade 5 Ti-6Al-4V |
| Titanium Propeller Shaft | Grade 5 Ti-6Al-4V |
| Titanium Waterjet Impeller | Grade 5 Ti-6Al-4V |
Frequently Asked Questions
What titanium grades are used in Marine Propellers & Shafting systems?
What manufacturing processes are used for Marine Propellers & Shafting?
What quality standards apply to Marine Propellers & Shafting components?
What industries use Marine Propellers & Shafting?
Can you provide DFM feedback for Marine Propellers & Shafting designs?
Engineering Trends
- ▸ Process: 5-axis CNC machining of blades
- ▸ Process: TIG welding of built-up propellers
- ▸ Process: Dynamic balancing
Related Manufacturing Capabilities
These specialized processes support Marine Propellers & Shafting component manufacturing.
One Metal. One Focus. Infinite Precision.
Founded in 2011 in Baoji's Titanium Valley, BOZE Metal is dedicated exclusively to titanium — from raw material to precision engineering. AS9100D, & ISO 9001 certified with 500+ clients across Aerospace, Medical & Motorsport industries, we deliver end-to-end precision titanium CNC machining with full material traceability from source to component.
Boze Titanium Manufacturing Center is operated by Baoji Boze Metal Products Co., Ltd.
Certifications verified by ASTM International titanium material specifications (B265, B348, B381, F136, F2924) with full EN 10204 3.1 mill test certification. Our quality system is operated under AS9100D by Baoji Boze Metal Products Co., Ltd.