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Quotes - Engineering - SalesAL-6XN in Tube-in-Tube Heat Exchangers
AL-6XN super-austenitic alloy excels in tube-in-tube exchangers for extreme chloride environments. High molybdenum, nitrogen, and nickel content deliver superior pitting resistance (PREN ˜50) and immunity to chloride stress corrosion cracking beyond duplex grades.
Key Applications for AL-6XN
- Offshore seawater: High-chloride cooling and injection water systems.
- Chemical processing: Hot concentrated chlorides, phosphoric acid, and aggressive brines.
- Pulp bleaching: Chlorine dioxide and peroxide stage exchangers.
- Pharma & biotech: Corrosive cleaning solutions and high-purity acid services.
- Flue gas desulfurization: Acidic slurry and absorber coolers.
Material Advantages
AL-6XN
- PREN ˜50
- Outstanding SCC Resistance
- High Crevice Corrosion Resistance
Corrosion Performance
AL-6XN
- Superior to Duplex in Hot Chlorides
- Resists Acidic Oxidizing Attack
- High-Temperature Stability
The Benefits of AL-6XN in Tube-in-Tube Heat Exchangers
AL-6XN enables tube-in-tube exchangers in highly corrosive chloride and acid services. Exceptional PREN and nitrogen-enhanced microstructure resist pitting and crevice attack far beyond 2205 or 316L.
Immunity to chloride stress corrosion cracking in hot, concentrated brines extends life in aggressive chemical and offshore applications. Maintains integrity under thermal cycling.
Good weldability with matching filler; high strength supports thinner walls for cost and weight savings. Counterflow efficiency remains high in fouling-prone streams.
Higher alloy cost justified by extended service intervals, reduced inspections, and elimination of exotic alternatives. Excellent for high-reliability critical processes.
Proven in seawater injection coolers, hot phosphoric acid lines, chlorine dioxide bleach systems, FGD absorber coolers, and aggressive chemical recovery — delivering maximum corrosion resistance and uptime.
