Exotic Alloy Flanges

Specialized materials for extreme operating conditions. Duplex, super-duplex, Inconel, Hastelloy, Monel, and titanium flanges for critical applications requiring maximum corrosion and temperature resistance.

Material Categories

Specialized alloys engineered for extreme corrosion, temperature, and pressure conditions.

Duplex Stainless Steels

2205 Duplex:

22% Cr, 5% Ni, 3% Mo - General corrosion resistance, sour service capable

2507 Super-Duplex:

25% Cr, 7% Ni, 4% Mo - Superior pitting resistance, extreme chloride environments

Benefits:

High yield strength, cost between stainless and nickel-base alloys

Nickel-Base Alloys

Inconel 600/625:

Inconel 600 (high-temp oxidation), Inconel 625 (high-temp + corrosion)

Hastelloy C-276:

Superior chemical resistance, strongest corrosion protection available

Monel 400:

Nickel-copper, excellent seawater corrosion resistance

Titanium

Properties:

Lightweight, exceptional corrosion resistance, high strength-to-weight ratio

Applications:

Aerospace, medical devices, seawater systems, chemical processing

Advantages:

Immune to chloride attack, ideal for desalination plants

Specialized Alloys

Niobium (formerly Columbium):

Niobium (formerly called Columbium): rare specialty use in nitric acid service. Custom-quote items.

Tantalum:

Extreme corrosion resistance for aggressive chemical environments (rare specialty, custom-quote items).

Custom Alloys:

Application-specific material development available

Application Suitability Matrix

Duplex Stainless

✓ Seawater/marine applications
✓ Oil and gas (sour service)
✓ Desalination plants
✓ Pulp and paper mills
✓ High chloride environments

Note: chloride service temperature limit ~250°F for 2205 / ~300°F for 2507 due to stress corrosion cracking risk.

Inconel (600/625)

✓ Aerospace engines and systems
✓ Chemical processing reactors
✓ Extreme temperature service
✓ High-pressure high-temp
✓ Specialized military applications

Hastelloy C-276

✓ Chemical processing plants
✓ Acid pickling operations
✓ Pharmaceutical production
✓ Flue-gas desulfurization
✓ Most aggressive chemical service

Titanium

✓ Desalination systems
✓ Ocean engineering
✓ Seawater intake systems
✓ Heat exchangers (seawater)
✓ Chlorine/hypochlorite service

When to Specify Exotic Alloys

Key criteria for selecting specialized materials over standard alloys.

Extreme Corrosion

When standard stainless steel shows signs of corrosion or pitting in your environment.

• High chloride service
• Aggressive chemical exposure
• Combined stress/corrosion

Extreme Temperature

Above ~1200°F where F91 reaches its limits. For sustained service near and above 1100°F, nickel-base alloys (Inconel 600/625) are often preferred.

• Aerospace applications
• Furnace service 1100°F+
• Superheater outlets

Regulatory Requirements

When codes or specifications mandate material performance exotics provide.

• ASME Section specifications
• API sour service limits
• Industry standards

Cost-Benefit Considerations

Exotic alloys cost significantly more but provide unique performance advantages.

Relative Costs

Carbon steel: baseline. Stainless: significantly higher than carbon. Duplex: between stainless and nickel-base. Inconel/Hastelloy: substantially higher than stainless. Titanium: among the highest. Call (281) 484-8325 for current pricing on your application.