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Choosing the Right Flange Material

Material selection is critical. Wrong choice leads to premature failure, corrosion, and safety incidents.

Carbon Steel Flanges

ASTM A105

Industry workhorse for general service.

• Applications: Oil/gas pipelines, petrochemical, power generation
• Temperature: -20F to 800F
• Tensile: 70,000 psi min

ASTM A350 LF2

Low-temperature with Charpy testing.

• Applications: LNG, cryogenic, cold climate
• Temperature: -50F to 800F

Stainless Steel Flanges

304/304L (F304/F304L)

• Applications: Food/beverage, pharmaceutical, chemical
• Excellent general corrosion resistance

316/316L (F316/F316L)

• Applications: Offshore, seawater, marine
• Superior chloride resistance (2-3% Moly)

Alloy Steel Flanges

Chrome-Moly (F11, F22, F91)

• F11: Up to 1000F, steam lines
• F22: Up to 1100F, high-pressure steam
• F91: Up to 1200F, ultra-supercritical plants

Specialty Materials

• Duplex (2205, 2507): Offshore seawater, desalination
• Nickel Alloys: Inconel, Hastelloy for extreme corrosion

Selection Factors

1. Process fluid corrosivity
2. Operating temperature/pressure
3. Environment (coastal, industrial)
4. Design life and total cost

Songhai Capabilities

• Carbon: A105, A350 LF2, A694
• Stainless: 304/304L, 316/316L, 321, 347
• Duplex: 2205, 2507
• Alloy: F11, F22, F91
• Nickel: Inconel 625, Hastelloy C276

All materials with MTRs and PED/NACE certification available.

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