CDA 955 / C95500 Nickel Aluminum Bronze Castings — Manufacturer & Exporter from India
Brass Parts India is a leading manufacturer and exporter of CDA 955 (C95500) Nickel Aluminum Bronze Castings, supplying high-integrity, traceable castings to the marine, offshore oil & gas, defence, pump, valve, and heavy engineering industries worldwide. With over 30 years of expertise in non-ferrous alloy casting, we deliver C95500 castings that meet ASTM B148, BS 1400 AB2, DIN CuAl10Ni5Fe4, and equivalent international standards, with full documentation and third-party inspection capability.
C95500 (CDA 955) Nickel Aluminum Bronze is considered the gold standard among bronze casting alloys for seawater and marine applications. Its outstanding corrosion resistance — especially resistance to cavitation erosion, crevice corrosion, and biofouling — combined with very high tensile strength and toughness, makes it the material of choice for propellers, impellers, valves, and structural components in the harshest offshore and naval environments.
What is C95500 / CDA 955 Nickel Aluminum Bronze?
C95500 is a nickel-containing aluminum bronze alloy (CDA 955), composed of approximately 79% copper, 10–11.5% aluminum, 3–5% iron, and 3.5–5.5% nickel. The nickel addition — the key differentiator from plain aluminum bronze (C95400) — significantly improves corrosion resistance in seawater, resistance to cavitation erosion in high-velocity flow, and overall toughness and fatigue strength. The resulting alloy is uniquely suited to the most demanding marine, naval, and offshore environments.
C95500 is equivalent to: BS 1400 AB2 (UK), DIN CuAl10Ni5Fe4 (Germany), ASTM B148 (USA), and IS 318 Grade 4 (India). It is the alloy specified by naval architects, oil & gas engineers, and pump designers worldwide for components that must perform without failure over extended service lives in aggressive aqueous environments.
Material Grades & International Equivalents
| Standard | Designation | Cu% | Al% | Ni% | Fe% | Key Use |
|---|---|---|---|---|---|---|
| ASTM B148 / CDA C95500 | Nickel Aluminum Bronze | Bal. | 10–11.5 | 3.5–5.5 | 3–5 | Marine propellers, pump impellers, valves |
| ASTM B148 / CDA C95400 | Aluminum Bronze 9C | Bal. | 10–11.5 | — | 3–5 | General engineering, less aggressive service |
| BS 1400 AB2 | Nickel Aluminum Bronze | Bal. | 8.5–10.5 | 4–6 | 3.5–5.5 | Marine, naval, offshore UK standard |
| DIN CuAl10Ni5Fe4 | Nickel Aluminum Bronze | Bal. | 9–11 | 4–6 | 3.5–5.5 | European marine and pump industry |
| IS 318 Grade 4 | Aluminum Bronze Ni | Bal. | 9–11 | 4–6 | 3–5 | Indian standard equivalent |
| JIS H 5111 AlBrC3 | Aluminum Bronze 3 | Bal. | 9–11 | 4–6 | 3–5 | Japanese marine standard |
Size & Dimensional Capabilities
| Parameter | Capability |
|---|---|
| Casting Weight | 0.5 kg to 800 kg |
| Maximum Dimensions | Up to 1500 mm diameter / 1200 mm length |
| Wall Thickness (minimum) | 4 mm (standard); 3 mm special |
| Surface Finish (as-cast) | Ra 6.3–12.5 µm |
| Machining Tolerance | ±0.05 mm (standard); ±0.02 mm (precision) |
| Centrifugal Casting Diameter | 50 mm to 600 mm OD (bushings, liners) |
| NDT Standards | ASTM E94, ASNT, ISO 9712 |
| MOQ | 5 pieces |
Key Applications — C95500 Nickel Aluminum Bronze
C95500 castings from Brass Parts India serve mission-critical applications worldwide. In the marine and shipbuilding sector, they are the premier choice for ship propellers, propeller blades and hubs, rudder components, stern tube bushings, sea chests, strainer bodies, and seawater pump components. In the offshore oil & gas industry, C95500 is used for subsea valve bodies, wellhead components, riser clamps, and instrumentation housings that must resist the corrosive deepwater environment for decades. Naval and defence applications include torpedo body parts, navy pump components, submarine fittings, and armoured vehicle bushings. In the pump and valve industry, C95500 is the preferred alloy for impellers, wear rings, casing wear plates, valve trims, and butterfly valve discs in seawater and process fluid service.
Performance Metrics — C95500 vs C95400
| Property | C95500 (CDA 955) | C95400 (CDA 954) |
|---|---|---|
| Tensile Strength | 620 MPa min | 515 MPa min |
| Yield Strength (0.2%) | 275 MPa min | 205 MPa min |
| Elongation | 6% min | 12% min |
| Hardness (Brinell) | 170–210 HB | 140–180 HB |
| Impact Strength (Charpy) | 20 J min | 27 J min |
| Seawater Corrosion Resistance | Superior | Excellent |
| Cavitation Erosion Resistance | Superior (Ni addition critical) | Good |
| Biofouling Resistance | Excellent | Good |
Our Technical Expertise
C95500 is one of the most technically demanding alloys to cast correctly. Its narrow solidification range, high melting temperature (~1040°C liquidus), and sensitivity to porosity and hot cracking require experienced metallurgists and tightly controlled casting parameters. Brass Parts India has been casting C95500 for decades, producing sound, high-integrity castings consistently. Our OES spectrometer verifies alloy chemistry — particularly the nickel and iron content — before every pour. Our gating and risering systems are designed to promote directional solidification and minimise porosity in critical sections.
Our quality system includes mandatory radiographic testing (RT) for all propeller hub, pump casing, and valve body castings, ultrasonic testing (UT) for thick-section parts, and dye penetrant testing (DPT) for surface integrity. We are experienced in working to Level 2 and Level 3 acceptance criteria per ASTM E186, ASTM E272, and equivalent standards.
Why Choose Brass Parts India for C95500 Castings?
Specialists in C95500: This is not a peripheral capability for us — it is one of our core alloy competencies. Our foundry team has produced C95500 castings for propeller manufacturers, naval shipyards, pump OEMs, and subsea equipment companies on four continents.
Full NDT Capability: We provide comprehensive NDT services in-house, including RT, UT, DPT, and dimensional inspection, supported by full documentation. We can also arrange classification society TPI (Lloyd’s, BV, DNV) as required.
30+ Years of Global Export: Our export track record to the USA, UK, Germany, Australia, Norway, the Netherlands, Singapore, and the UAE demonstrates the trust global customers place in our quality and reliability.
Technical Account Management: A dedicated technical account manager liaises with your engineering and procurement teams throughout the order — from drawing review and DFM to first article approval and production delivery. Your project never gets lost in the process.
Competitive Pricing with Premium Quality: India’s manufacturing cost advantages, combined with our efficiency and quality culture, allow us to offer C95500 castings at prices that global customers find highly competitive without compromising on the quality they demand.
What Separates Us from Other Manufacturers
Many foundries claim to cast C95500 but lack the in-house NDT, metallurgical expertise, or process controls to produce consistently sound castings for the most demanding marine and offshore applications. Brass Parts India’s integrated approach — alloy verification, casting, NDT, machining, and documentation — under one roof, with decades of proven experience in C95500, is what makes us the preferred choice for buyers who cannot afford casting failures in critical marine systems.
Our Flexibility to Customise Parts
We produce C95500 castings in a wide range of configurations — sand cast, centrifugal cast, and investment cast — depending on the geometry and quantity required. We accommodate custom chemistry adjustments within alloy specification limits, special heat treatment (solution annealing, temper annealing), specific NDT requirements, custom machining to any drawing, and non-standard documentation packages for defence or oil & gas customers.
Customer Testimonials
“We have sourced C95500 (CDA 955) pump impeller castings from Brass Parts India for our seawater lift pump systems for several years. Every casting is RT-clean on arrival, dimensions are on-print, and the documentation is impeccable. They are one of the very few foundries in India that truly understand the stringency required for offshore pump components.”
— Brett Sullivan, Senior Mechanical Engineer, Perth, Western Australia, Australia
“We specified AB2 (C95500) propeller hub castings for a fast patrol vessel project and were very pleased with Brass Parts India’s performance. The first articles passed our full NDT suite — RT, UT, and DPT — without any rejection. Lead time was as promised, and commercial communication was excellent throughout. We have since qualified them for multiple casting grades.”
— Commander Marcus Reid RN (Rtd.), Naval Procurement Specialist, Portsmouth, England, UK
Frequently Asked Questions (Q&A)
Q1. What makes C95500 better than C95400 for marine applications?
The 3.5–5.5% nickel in C95500 is the critical differentiator. Nickel improves resistance to cavitation erosion — the primary failure mode in marine propellers and pump impellers — by approximately 10× compared to plain aluminum bronze. It also improves seawater corrosion resistance, toughness, and fatigue strength, making C95500 the definitive choice for demanding marine applications.
Q2. Is C95500 the same as AB2 (BS 1400)?
They are closely related but not identical. ASTM C95500 has slightly different composition limits than BS 1400 AB2. Both are nickel aluminum bronze alloys with similar properties. We can cast to either standard and provide the corresponding MTC.
Q3. Can you produce C95500 castings with RT (radiographic testing) certification?
Yes. Radiographic testing is standard for critical C95500 castings such as propeller hubs, pump casings, and valve bodies. We reference ASTM E94 for RT technique and ASTM E186/E272 for acceptance criteria. RT reports and films/digital images are provided.
Q4. What heat treatment is available for C95500 castings?
The standard condition is as-cast. Temper annealing (quench-and-temper) is available to optimise the microstructure for maximum corrosion resistance — particularly important for seawater pump and propeller applications.
Q5. Can C95500 be used for freshwater as well as seawater applications?
Yes. C95500 performs excellently in both fresh water and seawater, as well as in many industrial chemical environments. It is highly resistant to erosion-corrosion in flowing water at high velocities.
Q6. What is the minimum wall thickness you can achieve in C95500 sand casting?
Our minimum reliable wall thickness in C95500 sand casting is approximately 4 mm for standard applications. Thinner sections of 3 mm are achievable with special gating and mould design.
Q7. Can you produce C95500 centrifugal castings (bushings, sleeves, liners)?
Yes. Centrifugal casting of C95500 is available for cylindrical forms such as propeller shaft bushings, stern tube liners, pump wear sleeves, and hydraulic cylinder liners. Centrifugal casting produces a denser, more uniform microstructure than static casting for these applications.
Q8. Do you supply machined C95500 pump impellers?
Yes. We offer fully machined C95500 impellers from sand casting, with all hydraulic passages, wear ring bores, key ways, and shaft bores machined to drawing. Balance testing is available on request.
Q9. What is the delivery time for C95500 castings?
Production orders with existing patterns: 4–6 weeks. New part development (including pattern making and first article): 6–10 weeks. Expedited options available for urgent requirements.
Q10. Can you supply CDA 955 castings to NACE MR0175 requirements for sour service?
C95500 is generally acceptable for NACE MR0175 low H₂S service. Please provide your specific environmental conditions and we will review and advise on alloy suitability and documentation requirements.
Q11. Do you supply C95500 castings with impact testing (Charpy)?
Yes. Charpy impact testing at ambient or sub-ambient temperatures is available, particularly for defence and offshore applications requiring low-temperature toughness verification.
Q12. Can you reverse-engineer a C95500 casting from a sample?
Yes. We can physically measure and chemically analyse an existing casting, create drawings, develop patterns, and reproduce it — often with improved gating design for better casting integrity.
Q13. Is C95500 approved for use in potable water systems?
C95500 is not typically recommended for potable water contact applications due to its aluminum content. Gunmetal (LG2, C83600) or phosphor bronze are preferred for drinking water applications.
Q14. Do you offer repair welding on C95500 castings?
Yes. We offer AWS D1.1 compliant repair welding for C95500 castings with appropriate nickel aluminum bronze welding consumables, followed by re-inspection as required.
Q15. What quality management system does your foundry operate under?
We operate under an ISO 9001-based quality management system with documented procedures for alloy control, mould making, pouring, cleaning, NDT, machining, and final inspection. Our QMS is available for customer audit at the facility.
Export-Worthy Packaging
C95500 castings are individually wrapped in VCI poly bags to prevent oxidation, packed in custom foam-lined wooden crates or heavy-duty metal containers, and secured with steel banding. Machined surfaces are protected with corrosion inhibitor oil or wax coating. All crates are clearly marked with alloy grade (C95500), heat number, customer PO, weight, and handling instructions. Full documentation — MTC, RT/UT/DPT reports, dimensional report, and commercial invoice — accompanies every shipment for smooth customs clearance at any international port.
Glossary of Related Terms
Cavitation Erosion: Damage caused by the violent collapse of vapour bubbles in fast-flowing liquids. C95500’s nickel content provides exceptional resistance, making it ideal for propellers and pump impellers.
Biofouling: The accumulation of marine organisms (barnacles, algae, mussels) on submerged surfaces. C95500’s copper content provides natural antifouling properties, reducing biofouling attachment.
Temper Annealing: A heat treatment for nickel aluminum bronze castings involving solution annealing followed by controlled cooling, optimising the microstructure for maximum corrosion resistance in the α+κ phase structure.
Cavitation Erosion Resistance Index: A measure of an alloy’s ability to withstand cavitation damage. C95500 has a cavitation erosion resistance rating approximately 10× higher than C95400 and far superior to stainless steels in many marine conditions.
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Brass Parts India — The Specialist Choice for C95500 Nickel Aluminum Bronze Castings Worldwide.