Alloy Steel ASTM A182 F91 Flanges are the best choice for the industries which require high temperature, pressure, and demanding operating conditions. They are known for their excellent stability and superior mechanical strength, these flanges play a critical role in keeping piping systems secure, leak-free, and efficient. If you are thinking of sourcing it or for export projects this will guide help you to make your decision.
What are Alloy Steel A182 F91 Flanges?
Alloy Steel ASTM A182 F91 Flanges are forged flanges and are a part of ASTM A182 standard. It is a high-grade combination of chromium, molybdenum, vanadium alloy steel designed specifically for high-temperature and high-pressure environments. Their chromium content helps them protect against oxidation, scaling, and chemical corrosion, and molybdenum content provides them with additional strength, and vanadium improves hardness and makes them more resistant to deformation and structural weakening. The flanges made from F91 play an important role in applications where system failure is not an option.
Why choose Alloy Steel ASTM A182 F91 Flanges?
Choosing Alloy Steel ASTM A182 F91 Flanges comes up with several key features. These key features are:
• Exceptional creep and tensile strength
• High resistance to oxidation and thermal fatigue
• Stable performance under extreme temperatures
• Strong mechanical integrity over long-term use
• Enhanced hardness due to chromium-molybdenum-vanadium composition
• Suitable for ultra-critical boiler and turbine systems
Applications of Alloy Steel ASTM A182 F91 Flanges:
• Ultra-supercritical and supercritical power plants
• High-pressure steam lines
• Petrochemical units
• Industrial boilers and reheaters
• Refineries and thermal plants
• Gas processing systems
Specifications of Alloy Steel ASTM A182 F91 Flanges:
Specifications: Alloy Steel ASTM A182 F91 Flanges
Alloy Steel F91 Flanges Standards: ASTM, ASME Flanges, ANSI Flanges, DIN Flanges, EN Flanges, BS Flanges etc.
ASTM A182 F91 Pipe Flanges Size: ½” to 36″
AS A182 F91 RTJ Flanges Wall Thickness: SCH.10, 20, 30, 40, 80, 120, 160, STD, XS, XXS.
SA 182 Gr F91 Steel Flanges Grade: ASTM / ASME A182 F1 / F5 / F9 / F91 / F12 / F91 / F91
ASTM A182 Grade F91 Flanges Face Type: Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
A182 F91 Material Class/ Pressure: 150#, 300#, 400 #, 600#, 900#, 1500# & 2500#
A182 Gr F91 Flanges Dimension: 150#, 300#, 600#, 900#, 1500#, 2500#. PN6, PN10, PN16, PN25, PN40, PN64 etc.
ASTM A182 F91 Material Properties: Stainless Steel, Carbon Steel, Alloy Steel
Chemical Composition of Alloy Steel ASTM A182 F91 Flanges:
Grade C Mn Si S P Cr Mo
ASTM A182 F91 0.15 0.3 - 0.6 0.5 - 1 0.03 0.03 8 - 10 0.9 - 1.1
Mechanical Properties of Alloy Steel ASTM A182 F91 Flanges:
Grade Tensile Strength (Mpa) Yield Strength (Mpa) Elongation %
A182 F91 275 485 20
Conclusion: ASTM A182 F91 alloy steel flanges offer unmatched durability and high-temperature performance, making them essential for industries that operate in extreme environments. With superior metallurgical properties and long service life, F91 flanges continue to be a top choice for engineers seeking reliability and advanced material strength.

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