Naval Brass Castings & Naval Brass Parts — Manufacturer & Exporter from India
Brass Parts India is a specialist manufacturer and exporter of Naval Brass Castings and Naval Brass Parts, supplying precision-engineered components to the marine, shipbuilding, defence, offshore, and heavy engineering industries across the USA, UK, Germany, Australia, Canada, and the Middle East. With over three decades of expertise in non-ferrous casting and machining, we deliver naval brass castings and precision machined parts that meet the most demanding marine and defence specifications.
Naval brass — one of the most trusted alloys in marine engineering — is prized for its excellent resistance to dezincification and seawater corrosion, its high strength, and its superior castability. Our castings are used aboard commercial vessels, naval ships, offshore platforms, and coastal infrastructure worldwide, where reliability in salt water environments is non-negotiable.
What is Naval Brass?
Naval brass (also called Admiralty brass or Tobin bronze) is a copper-zinc-tin alloy, typically comprising approximately 60% copper, 39.25% zinc, and 0.75% tin. The small addition of tin dramatically improves resistance to dezincification — the selective corrosion of zinc from brass in seawater — making it far more durable than standard brasses in marine environments. It also provides good strength, excellent castability, and satisfactory machinability.
Naval brass is standardised as CDA C46400/C46500 (USA), BS CZ112 (UK), DIN CuZn38Sn1 (Germany), and IS 319 (India). It is the industry-standard alloy for marine propeller shafts, ship fittings, marine hardware, condenser tube plates, valve bodies for seawater service, and pump components exposed to the sea.
Material Grades & International Equivalents
| Standard | Designation | Cu% | Zn% | Sn% | Key Properties |
|---|---|---|---|---|---|
| CDA C46400 | Naval Brass (Uninhibited) | 59–62 | Bal. | 0.5–1.0 | Good strength, dezincification resistance |
| CDA C46500 | Naval Brass (As/Sb inhibited) | 59–62 | Bal. | 0.5–1.0 | Enhanced dezincification resistance |
| CDA C48200 | Naval Brass, Medium Leaded | 59.5–62 | Bal. | 0.5–1.0 | Free-machining naval brass parts |
| BS CZ112 | Naval Brass (UK) | 61–64 | Bal. | 0.6–1.2 | Marine fittings, valve bodies |
| DIN CuZn38Sn1 | Naval Brass (German) | 60–63 | Bal. | 0.5–1.0 | European marine engineering standard |
| IS 319 | Naval Brass (Indian) | 59–63 | Bal. | 0.5–1.0 | Indian standard for marine applications |
| ASTM B21 / B111 | Naval Brass Rod/Tube Plates | 59–62 | Bal. | 0.5–1.0 | Condenser tube plates, heat exchangers |
Size & Dimensional Capabilities
| Parameter | Capability |
|---|---|
| Casting Weight | 0.5 kg to 500 kg |
| Machined Parts — Length | Up to 3000 mm (turned shafts and bars) |
| Machined Parts — Diameter | 10 mm to 600 mm |
| Plate / Tube Plate Size | Up to 1500 mm × 1000 mm × 200 mm thick |
| Machining Tolerance | ±0.02 mm (precision shafts and bushings) |
| Surface Finish | Ra 0.8–3.2 µm (machined surfaces) |
| MOQ | 5 pieces (custom orders welcome) |
Key Applications — Naval Brass Castings & Machined Parts
Naval brass from Brass Parts India is used across a wide range of marine and industrial applications. Marine hardware includes cleats, fairleads, bollards, capstan heads, port lights, and deck ventilators. Valve and fitting bodies in naval brass serve seawater cooling lines, bilge systems, and ballast systems aboard ships. Propeller shafts and tailshafts are machined from naval brass bar to precise dimensional tolerances. Condenser tube plates and heat exchanger components use naval brass for its exceptional seawater corrosion resistance. Pump impellers and casings for seawater service are cast and machined in naval brass for reliable long-term performance. Defence applications include ammunition components, fuze bodies, and navy engineering hardware where dezincification resistance is required under prolonged seawater exposure.
Performance Metrics
| Property | C46400 Naval Brass | C48200 Leaded Naval Brass |
|---|---|---|
| Tensile Strength | 380 MPa min | 370 MPa min |
| Yield Strength (0.2%) | 170 MPa min | 160 MPa min |
| Elongation | 40% min (annealed) | 35% min |
| Hardness (Brinell) | 80–100 HB | 75–95 HB |
| Dezincification Resistance | Excellent (Sn inhibited) | Excellent |
| Machinability | Good (50% vs FCC brass) | Very Good (70%) |
| Seawater Corrosion Resistance | Excellent | Excellent |
Our Technical Expertise
Brass Parts India has extensive experience supplying naval brass castings and precision parts to shipyards, naval architects, defence contractors, and marine equipment manufacturers. Our understanding of marine engineering requirements — including Lloyd’s Register, Bureau Veritas, DNV, and RINA classification society requirements — allows us to produce castings with the correct documentation for new vessel construction and repair projects.
Our in-house machining facility equipped with CNC lathes, milling machines, and boring mills enables us to supply naval brass parts in fully machined condition, including precision propeller shaft sections, tube plate drilling and boring, valve body machining, and custom flange fabrication. All castings and machined parts are traceable through our batch and heat number system.
Why Choose Brass Parts India for Naval Brass Castings?
Marine Industry Specialists: We have decades of experience in marine alloy casting, including naval brass, aluminum bronze, gunmetal, and manganese bronze. Our team understands marine engineering standards, survey requirements, and the long-service-life expectations of marine operators.
Classification Society Compliance: We can produce castings with third-party inspection by Lloyd’s Register, Bureau Veritas, DNV-GL, and other classification societies — providing the quality assurance documentation required for new ship construction and certified repair work.
Integrated Casting + Machining: From raw casting to fully machined and tested component, we handle the complete manufacturing process in-house. This gives you a single point of accountability and eliminates the risks associated with multi-vendor supply chains.
Responsive & Reliable: The marine industry often operates on urgent schedules — vessels in dry dock, emergency repairs, or fast-tracked new builds. Our flexible production planning and dedicated account management team ensures we respond quickly to urgent requirements.
What Separates Us from Other Manufacturers
We combine alloy knowledge, casting expertise, machining precision, and export experience in one facility. For naval brass applications, this means you receive correctly specified alloys (with dezincification inhibitors where required), sound castings, precisely machined surfaces, and full documentary evidence — all in one shipment from one supplier. Our customers in the UK Royal Navy supply chain, US commercial shipbuilding, and German offshore industry return to us repeatedly because this integrated approach saves them time, reduces cost, and eliminates quality uncertainty.
Our Flexibility to Customise Parts
We can produce naval brass components in non-standard sizes, alloy variants (including arsenic or antimony-inhibited grades for maximum dezincification resistance), special heat treatment conditions, or with specific plating and coating requirements. We actively work with customers’ design and materials engineering teams to select the optimal alloy and manufacturing route for each application.
Customer Testimonials
“Brass Parts India has been our supplier for naval brass propeller shaft sleeves and marine hardware castings for many years. Their quality is consistently excellent, the delivery is reliable, and they understand marine engineering requirements without needing extensive hand-holding. A dependable, professional foundry.”
— Captain Ian McAllister (Rtd.), Marine Consultant, Sydney, New South Wales, Australia
“We approached Brass Parts India for a batch of naval brass tube plates for a naval vessel heat exchanger refurbishment. They provided first articles within the promised timeline, all dimensions were on-print, and the material certificates were flawless. We have since placed follow-on orders and couldn’t be more satisfied.”
— Hans-Peter Schreiber, Naval Systems Engineer, Kiel, Germany
Frequently Asked Questions (Q&A)
Q1. What is dezincification and why does naval brass resist it?
Dezincification is the selective leaching of zinc from copper-zinc alloys in seawater or corrosive media, leaving a porous, weakened copper matrix. The addition of tin (and sometimes arsenic or antimony) in naval brass stabilises the zinc and prevents this corrosion mechanism — making it safe for long-term seawater service.
Q2. What is the difference between naval brass and admiralty brass?
Both are tin-containing brass alloys with dezincification resistance. Admiralty brass (C44300) typically has slightly higher copper and is used mainly for tubing and condenser tubes. Naval brass (C46400) has somewhat higher zinc for better strength and is commonly used for castings, hardware, and structural marine components.
Q3. Can you produce naval brass castings to Lloyd’s or Bureau Veritas requirements?
Yes. We regularly produce castings with third-party inspection by classification societies including Lloyd’s Register, Bureau Veritas, DNV-GL, and RINA. Please specify the survey requirements at the time of enquiry.
Q4. Do you supply naval brass propeller shafts?
We supply naval brass shaft sections machined from continuous cast or forged bar. Full machining including keyways, tapers, and threaded ends is available.
Q5. What is the difference between C46400 and C46500 naval brass?
Both are dezincification-resistant naval brasses. C46500 contains additional arsenic (As) or antimony (Sb) as inhibitors, providing enhanced protection in particularly aggressive seawater environments.
Q6. Are naval brass castings suitable for deep-sea or offshore applications?
Yes. Naval brass castings with appropriate wall thickness and design are used in offshore structures, subsea valve bodies, and deepwater instrumentation housings. For very aggressive or high-temperature offshore conditions, nickel aluminum bronze (C95500) is often preferred and we supply that as well.
Q7. Can you produce naval brass condenser tube plates with drilled holes?
Yes. We can produce naval brass tube plates as sand castings or from continuous cast plate, and machine them with precisely drilled and reamed tube holes to the required pitch and tolerance.
Q8. What machining tolerances can you achieve on naval brass parts?
Our CNC machining facility can hold tolerances of ±0.02 mm on precision features such as bearing bores, shaft diameters, and sealing surfaces. Surface finish to Ra 0.8 µm is achievable on machined faces.
Q9. Do you offer annealing for naval brass castings?
Yes. Stress-relief annealing and full annealing treatments are available. This is particularly important for complex or heavily cored castings where residual stresses could cause distortion during machining or service.
Q10. How does naval brass compare to phosphor bronze for marine applications?
Naval brass is generally preferred for valve bodies, hardware, and structural parts due to its better castability and lower cost. Phosphor bronze (tin bronze) offers higher tensile strength and is preferred for gears, bearings, and spring applications. We supply both alloys and can advise the optimal choice for your application.
Q11. Can you supply IMPA-coded marine hardware in naval brass?
Yes. We are familiar with IMPA marine catalogue specifications and can produce hardware items to IMPA standards or to customer-supplied drawings.
Q12. What is your minimum lead time for emergency marine orders?
For common stock items, we may be able to ship within 1–2 weeks. For non-stock custom castings, a minimum of 3–4 weeks is typically required. We always try our best to support urgent vessel repair requirements.
Q13. Do you supply anti-fouling treated naval brass castings?
Naval brass itself has natural resistance to biofouling due to its copper content. For additional protection, we can apply approved coatings or primers as specified by the customer.
Q14. Can you supply naval brass castings with material traceability to specific heats of metal?
Yes. Our batch tracking system maintains full traceability from raw material heat to finished casting, and every shipment is accompanied by a heat-traceable MTC.
Q15. Do you produce naval brass castings in small quantities for R&D or prototype purposes?
Yes. We welcome prototype and development orders of as few as 5 pieces. Our flexible production scheduling accommodates small development batches alongside larger production runs.
Export-Worthy Packaging
Naval brass castings and machined parts are packed in VCI anti-corrosion wrapping to prevent tarnishing during sea transit. Castings are nested in foam or custom-cut wooden cradles within sea-worthy wooden crates or heavy-duty steel-strapped cardboard boxes. Machined surfaces are protected with rust-preventive oil or wax coating and individually sleeved. All packages are clearly labelled with heat number, grade, part number, PO, net weight, and destination. Full export documentation including MTC, classification society certificates, packing list, and commercial invoice is provided as standard.
Glossary of Related Terms
Dezincification: Selective leaching of zinc from copper-zinc alloys, weakening the material. Naval brass resists dezincification due to its tin content.
Admiralty Brass: A closely related dezincification-resistant brass alloy used primarily for condenser tubing (C44300). Not the same as Naval Brass (C46400), though both contain tin for corrosion resistance.
Tube Plate: A drilled plate in a heat exchanger or condenser through which tubes are fitted. Naval brass is the classic tube plate material for seawater-cooled heat exchangers.
Classification Society: An independent body (e.g., Lloyd’s Register, Bureau Veritas, DNV-GL) that sets standards for marine structures and certifies that materials and components meet those standards.
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Call to Action
Searching for a reliable manufacturer of Naval Brass Castings and Naval Brass Parts with proven marine industry credentials and global export capability? Brass Parts India is ready to be your trusted supply partner. Contact us today with your specifications or drawings.
📧 Email: sales@brass-parts-india.com
📞 Phone / WhatsApp: +91 22 43 44 9300
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Brass Parts India — Your Trusted Partner for Marine & Naval Brass Castings Worldwide.