Is NAB better than Stainless Steel for seawater?

Yes, generally NAB is superior for seawater applications because it resists crevice corrosion and biofouling better than SS 316, which can suffer from pitting in stagnant seawater.

Is Nickel Aluminium Bronze magnetic?

No, NAB with controlled iron content is non-magnetic, making it suitable for mine sweepers and sensitive electronic environments.

Stainless Steel vs Nickel Aluminium Bronze (NAB)

A Technical Comparison for Valve Selection in Marine & Industrial Environments

Choosing the Right Material

Selecting between Stainless Steel (SS 316 / CF8M) and Nickel Aluminium Bronze (NAB / C95800) is a critical decision for engineers designing piping systems for seawater, brackish water, or corrosive chemical applications. While both offer excellent properties, their performance varies significantly based on the environment.

Head-to-Head Comparison

Feature	Stainless Steel (SS 316)	Nickel Aluminium Bronze (NAB)
Seawater Corrosion	Good, but prone to pitting & crevice corrosion in stagnant water.	Excellent. Forms self-healing oxide layer. Resistant to pitting.
Biofouling Resistance	Poor. Requires chlorination or coating.	Excellent. Copper content naturally inhibits marine growth.
Cavitation Resistance	Moderate.	Superior. Ideal for high-velocity pumps and valves.
Strength (Yield)	Higher (~205 MPa for 316)	High (~240-275 MPa for C95800), comparable or better than standard austenitic SS.
Cost	Generally lower due to wide availability.	Higher raw material cost, but lower lifecycle cost in marine use.
Magnetic Permeability	Low (Non-magnetic in annealed state)	Non-magnetic (ideal for mine sweepers/subs).

When to choose Stainless Steel?

Stainless Steel (SS 304/316) is the industry standard for:

General chemical processing
Food and pharmaceutical applications (sanitary)
High-temperature environments (>300°C) where Bronze loses strength
Fresh water and atmospheric exposure

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When to choose NAB?

NAB Valve ASTM B148 C95800 Nickel Aluminium Bronze

Nickel Aluminium Bronze is engineered for:

Seawater intake and cooling systems
Desalination plants
Offshore fire protection (deluge) systems
Marine propulsion and hull fittings
Environments requiring non-sparking properties

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Need Expert Advice?

At Supreme Valves India, we manufacture both SS and NAB valves. Our engineering team can help you select the optimal material for your specific project requirements to ensure safety and longevity.

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