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China Slip-on Pipe Flange Class 150 RF - Reliable Suppliers and Quality Factory Manufacturing
Material Grade
Carbon Steel
ASTM A105 / A105N
ASTM A350 LF2 / LF3
ASTM A694 F42 / 46 / 56 / 60 / 65
ASTM A350 LF2 / LF3
ASTM A694 F42 / 46 / 56 / 60 / 65
Stainless Steel
ASTM A182 F304 / 304L / 304H, 316 / 316L, 310S, 317, 347, 904L
ASTM A182 F51, F53, F44
ASTM A182 F51, F53, F44
Alloy Steel
ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Sealing Face
RF
FF
FTJ
Frequently Asked Questions
Q
What is the difference between Carbon Steel A105 and A105N?
ASTM A105 is a standard specification for carbon steel forgings used in piping components. The "N" suffix in A105N indicates that the material has been normalized — a heat treatment process that refines the grain structure and improves mechanical properties, making it suitable for more demanding pressure applications.
Q
What is ASTM A350 LF2 / LF3 used for?
ASTM A350 LF2 and LF3 are low-temperature carbon steel grades used for flanges and fittings in piping applications that require notch toughness testing. They are commonly used in cryogenic or cold-weather service environments where standard carbon steel may become brittle.
Q
What are the advantages of Stainless Steel grades like 316L or 904L?
Grade 316L offers superior corrosion resistance compared to 304, especially against chlorides and acidic environments, while the low carbon content minimizes sensitization risk during welding. Grade 904L provides even higher resistance to sulfuric acid and pitting corrosion, making it ideal for aggressive chemical processing environments.
Q
When should Alloy Steel grades such as F91 or F92 be selected?
ASTM A182 F91 and F92 are chromium-molybdenum alloy steels specifically designed for high-temperature and high-pressure service, such as in power generation and petrochemical plants. They offer excellent creep resistance and long-term strength at elevated temperatures, making them preferred materials for critical steam systems.
Q
What is the difference between RF, FF, and FTJ sealing faces?
RF (Raised Face) is the most common sealing face, concentrating bolt load on a smaller gasket area for a reliable seal. FF (Flat Face) uses the entire flange face as the sealing surface and is typically used with full-face gaskets on cast iron or non-metallic flanges. FTJ (Female-Tongue and Groove Joint) provides a self-aligning, high-integrity seal ideal for hazardous or high-pressure fluid services.
Q
How do I choose the right material grade for my application?
Material selection depends on several factors including operating temperature, pressure rating, fluid media (corrosiveness, toxicity), and environmental conditions. Carbon steel grades are suitable for standard pressure and temperature ranges, while stainless steel or alloy steel grades are recommended for corrosive, cryogenic, or high-temperature applications. Always consult applicable ASTM standards and engineering specifications before making a final selection.