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
- Process fluid corrosivity
- Operating temperature/pressure
- Environment (coastal, industrial)
- 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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