Marine & Offshore

NAB Valves vs Other Marine Materials: Complete Comparison Guide

Published on March 13, 2026 | By Supreme Valves India

Selecting the right valve material for marine and offshore applications is critical for system reliability and maintenance costs. This guide compares Nickel Aluminum Bronze (NAB/NiAlBr) with other commonly used materials.

Material Comparison Overview

NAB vs 316 Stainless Steel

Corrosion Resistance

• NAB forms a protective oxide layer that self-heals in seawater
• 316 SS is prone to pitting and crevice corrosion in chloride environments
• NAB shows better biofouling resistance

Mechanical Properties

• NAB has superior galling resistance
• 316 SS work hardens, NAB maintains machinability
• NAB has better impact resistance at low temperatures

NAB vs Duplex Stainless Steel

Cost Efficiency

• NAB is 30-40% less expensive than Duplex SS
• Duplex requires more expensive welding procedures
• NAB valves have lower lifecycle costs in seawater

Performance

• Both materials excellent for seawater service
• Duplex has higher pressure ratings available
• NAB preferred for gate, globe, and check valves

NAB vs Titanium

Cost Comparison

• Titanium is 5-10x more expensive than NAB
• Use titanium only for critical high-temperature chlorine service
• NAB provides adequate performance at lower cost

When to Use Titanium

• Very high temperature seawater (>150°C)
• Strong oxidizing acids
• When minimum weight is critical (marine hull)

Application Guidelines

Conclusion

Nickel Aluminum Bronze (NAB) valves offer the best balance of corrosion resistance, mechanical properties, and cost-effectiveness for most marine and seawater applications. While specialty materials like titanium have their place in extreme conditions, NAB remains the material of choice for valve applications in marine environments.