Marine & Offshore

🚢 Marine Propellers & Shafting

Large-diameter, complex blade curvature, tapered shaft with keyway, flanged couplings

3 Components 1 Materials 3 Processes 3 Standards

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

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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:

5-axis CNC milling of blade surfacesTIG/MIG welding of fabricated propellersKeyway broaching of shaftsDynamic balancing

Toll Processing Services:

Investment castingER ultrasonic inspectionHydrostatic test (hub)Salt spray test

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

View Related Services → 📩 Get Formal Quote

Manufacturing Process Flow

1
5-axis CNC machining of blades

Simultaneous 5-axis CNC milling enables complex freeform geometries to be machined in a single setup, eliminating positional errors from multiple fixt

2
Dynamic balancing

Professional manufacturing process for titanium components. Dynamic balancing is performed by certified technicians following approved procedures and

3
TIG welding of built-up propellers

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?
Marine Propellers & Shafting components are manufactured from Grade 5 Ti-6Al-4V. The specific grade is selected based on mechanical property requirements, corrosion resistance needs, and Marine & Offshore industry regulations.
What manufacturing processes are used for Marine Propellers & Shafting?
The Marine Propellers & Shafting system components are produced using 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, TIG welding autogenous with SPC sampling. Each process is selected and qualified to meet the specific dimensional, metallurgical, and surface requirements of each component within the system.
What quality standards apply to Marine Propellers & Shafting components?
Marine Propellers & Shafting components are manufactured to NORSOK M-001 (quietrunning submarine applied), NORSOK M-001 (marine propulsion applied), NORSOK M-001 (waterjet propulsion applied) and other applicable specifications. Full material traceability, dimensional inspection reports, and certificates of conformance are provided with each shipment.
What industries use Marine Propellers & Shafting?
Marine Propellers & Shafting systems are deployed in Marine & Offshore applications. Each industry has specific regulatory and performance requirements that drive material selection and process qualification.
Can you provide DFM feedback for Marine Propellers & Shafting designs?
Yes. Our engineering team provides free Design for Manufacturability (DFM) analysis for Marine Propellers & Shafting projects. Upload your CAD file (STEP, DXF, or DWG format) and our team will review your design within 24 hours.

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.

5-axis CNC machining of blades Dynamic balancing TIG welding of built-up propellers
About Boze Titanium Manufacturing Center

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 13485 & 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 CNC Ti is the dedicated titanium manufacturing center of Baoji Boze Metal Products Co., Ltd.

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