ASTM B148 C95800 Nickel Aluminium Bronze (NAB) Valves
Premium Grade ASTM B148 C95800 / C95500 Valves for Marine & Seawater Service
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NAB Gate Valve — ASTM B148 C95800
Superior Corrosion Resistance for Marine Environments
Nickel Aluminium Bronze (NAB) is the material of choice for aggressive seawater environments where standard stainless steels fail. Supreme Valves India manufactures high-performance NAB valves conforming to ASTM B148 UNS C95800, offering exceptional resistance to chloride stress corrosion cracking, cavitation, and biofouling.
Our NAB valves are widely used in offshore platforms, naval vessels, desalination plants, and coastal power stations.
Why Choose NAB (C95800)?
Seawater Corrosion Resistance
Forms a protective oxide film that self-heals, providing longevity in aerated seawater.
Anti-Biofouling
Naturally inhibits the growth of marine organisms like barnacles and algae, maintaining flow efficiency.
Cavitation Resistance
Superior to Stainless Steel and Monel in resisting damage from high-velocity turbulent flow.
ASTM B148 C95800 — Material Specification
ASTM B148 is the standard specification for Aluminium-Bronze Sand Castings. Grade C95800 (UNS C95800) is the most widely specified grade for marine and seawater valve bodies, bonnets, and trim components.
Chemical Composition (% by weight)
| Element | Min % | Max % |
|---|---|---|
| Copper (Cu) | 79.0 | Remainder |
| Aluminium (Al) | 8.5 | 9.5 |
| Nickel (Ni) | 4.0 | 5.0 |
| Iron (Fe) | 3.5 | 4.5 |
| Manganese (Mn) | 0.8 | 1.5 |
| Silicon (Si) | — | 0.10 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (min) | 585 MPa (85 ksi) |
| Yield Strength (min) | 240 MPa (35 ksi) |
| Elongation (min) | 15% |
| Brinell Hardness | 159 HB (typical) |
| Density | 7.64 g/cm³ |
| Max Service Temp | 288°C (550°F) |
| Weldability | Excellent (GTAW/GMAW) |
Equivalent Specifications
ASTM B148 C95800 = UNS C95800 = BS 1400 AB2 = DIN 1714 CuAl10Ni5Fe4 = EN 1982 CC333G. All Supreme Valves NAB products are supplied with EN 10204 3.1 Material Test Certificates and full traceability.
Our NAB Valve Range
NAB Butterfly Valves
Concentric and Double Offset designs for large bore seawater cooling lines.
- Sizes: 2" to 48"
- Pressure: PN10 / PN16 / Class 150
NAB Gate & Globe Valves
API 600 / BS 1873 designs for isolation and throttling service.
- Trim: Monel or NAB
- Ends: Flanged RF / FF
NAB Check Valves
Swing Check and Dual Plate Check valves to prevent backflow in saline systems.
- Type: Swing, Dual Plate, Lift
- Standard: API 594 / API 6D
FAQ: NAB Valves
What is ASTM B148 C95800?
ASTM B148 C95800 (UNS C95800) is the standard specification for Nickel Aluminium Bronze sand castings. It is the most widely specified material for seawater valve bodies due to its superior corrosion resistance, anti-biofouling properties, and high mechanical strength.
What is the difference between C95800 and C95500?
C95800 (Alpha-Beta) is optimized for seawater corrosion resistance and weldability, making it standard for marine valves. C95500 offers higher strength but lower corrosion resistance.
Can NAB valves be used with firewater systems?
Yes, NAB is widely used in offshore firewater deluge systems due to its reliability in stagnant seawater conditions.
What are the equivalent standards for ASTM B148 C95800?
ASTM B148 C95800 = UNS C95800 = BS 1400 AB2 = DIN 1714 CuAl10Ni5Fe4 = EN 1982 CC333G. All designate the same Nickel Aluminium Bronze alloy.