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.
WhatsApp: +86-18658777855
Email: 1007788887@qq.com
You may also like
Orifice Flanges Complete Guide Selection Installation and Flow Measurement Standards
What Are Orifice Flanges and How Do They Work Orifice flanges are specialized piping components designed for precise flow measurement in pressurized systems. Unlike standard weld neck flanges, orifice flanges feature tapped holes (pressure taps) drilled radially through the base, enabling accurate differential pressure readings across an orifice plate. At Songhai Flange, we understand that […]
Flange Bolt Torque Values Complete Reference Chart for ASME B16.5
Why Proper Flange Bolt Torque Prevents Costly Leaks Incorrect bolt torque is a leading cause of flange joint failures. Applying correct torque ensures proper gasket compression and prevents shutdowns and safety incidents. Target Torque Calculation Formula ASME PCC-1 Appendix K formula: T = K x D x F / N T = Target torque per […]
PED vs ASME vs API Which Flange Standard Is Strictest
Understanding Flange Standards Comparison Between ASME, API, ISO, and PED, which standard is strictest? The answer depends on what you measure. PED: Europe Legal Mandate The Pressure Equipment Directive (2014/68/EU) is an EU legislative directive for pressure equipment over 0.5 bar. Unlike voluntary ASME/API standards, PED is a regulatory mandate requiring CE marking for EU […]