Marine & Offshore

🚤 Submarine & Naval Propulsion Components

Large-diameter thin-wall cylindrical bushings/bearings with precision bore tolerance, keyway slots, threaded mounting holes

4 Components 1 Materials 3 Processes 4 Standards

What is Submarine & Naval Propulsion Components?

🚤 Submarine & Naval Propulsion Components represents a complete system of precision titanium components engineered for Marine & Offshore applications. Large-diameter thin-wall cylindrical bushings/bearings with precision bore tolerance, keyway slots, threaded mounting holes The system integrates 4 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 at 200W fiber laser, TIG welding autogenous at 200W fiber laser, Hydrostatic pressure test at 200W fiber laser, CNC turn-bore operation with SPC sampling, each selected and qualified to meet component-specific requirements.

Engineering & Design Principles

Material: Grade 5 (Ti-6Al-4V) for propellers, shafts, and structural components. Grade 5 ELI for deep-sea pressure vessels requiring maximum fracture toughness. Grade 7 (Pd alloy) for hot chemical injection lin

Form: Bar/forging stock for shafts and structural components. Investment casting for impeller blades. Ring forgings for flanges. All marine fasteners must be hot-headed + thread rolled with vacuum annealing

Standards & Material Specifications

Standards: MIL-T-9046 Grade 5, annealed, magnetic permeability <1.01, 100% dimensional + surface finish inspection

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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

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Manufacturing Process Flow

1
CNC turning & boring of ID/OD

CNC turning of titanium on multi-axis lathes produces cylindrical components with precision diameters and surface finishes. Live tooling enables milli

2
Keyway broaching

Professional manufacturing process for titanium components. Keyway broaching is performed by certified technicians following approved procedures and s

3
Precision honing of bearing surface

Titanium anodizing (AMS 2488) grows a controlled oxide layer through electrochemical conversion in an electrolyte bath. Type II produces interference

Components in This System

Component Material
Titanium Propeller Pitch Linkage Grade 5 Ti-6Al-4V
Titanium Submarine Engine Mount Stud Grade 5 Ti-6Al-4V
Titanium Submarine Steering Rudder Pin Grade 5 Ti-6Al-4V
Titanium Trim Tab Hydraulic Ram End Grade 5 Ti-6Al-4V

Frequently Asked Questions

What titanium grades are used in Submarine & Naval Propulsion Components systems?
Submarine & Naval Propulsion Components 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 Submarine & Naval Propulsion Components?
The Submarine & Naval Propulsion Components system components are produced using Ring forging radial-axial for propulsion geometry, CNC turn-bore operation at 200W fiber laser, TIG welding autogenous at 200W fiber laser, Hydrostatic pressure test at 200W fiber laser, 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 Submarine & Naval Propulsion Components components?
Submarine & Naval Propulsion Components components are manufactured to NORSOK M-001 (controllable pitch applied), NORSOK M-001 (noisedampening submarine applied), NORSOK M-001 (marine steering applied), NORSOK M-001 (highspeed trim applied) and other applicable specifications. Full material traceability, dimensional inspection reports, and certificates of conformance are provided with each shipment.
What industries use Submarine & Naval Propulsion Components?
Submarine & Naval Propulsion Components 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 Submarine & Naval Propulsion Components designs?
Yes. Our engineering team provides free Design for Manufacturability (DFM) analysis for Submarine & Naval Propulsion Components projects. Upload your CAD file (STEP, DXF, or DWG format) and our team will review your design within 24 hours.

Engineering Trends

  • ▸ Process: CNC turning & boring of ID/OD
  • ▸ Process: Keyway broaching
  • ▸ Process: Precision honing of bearing surface

Related Manufacturing Capabilities

These specialized processes support Submarine & Naval Propulsion Components component manufacturing.

CNC turning & boring of ID/OD Keyway broaching Precision honing of bearing surface
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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