钢制法兰材料指南 碳不锈钢和合金的选择

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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