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China Suppliers Factory A105 Carbon Steel NPT Threaded Pipe Flange with Raised Face - Quality Connections
Material Grade
🔩
Carbon Steel
ASTM A105
ASTM A105N
ASTM A350 LF2
ASTM A350 LF3
ASTM A694 F42
F46
F56
F60
F65
⚙️
Stainless Steel
ASTM A182 F304
F304L
F304H
F316
F316L
F310S
F317
F347
F904L
F51
F53
F44
🛠️
Alloy Steel
ASTM A182 F11
F12
F5
F9
F91
F92
🔒
Sealing Face
RF
FF
FTJ
Frequently Asked Questions
Q
What is the difference between ASTM A105 and ASTM A105N?
ASTM A105 refers to carbon steel forgings for piping components, while ASTM A105N indicates the same material with an additional normalizing heat treatment process. The "N" designation ensures improved mechanical properties and greater dimensional stability, making it preferred in more demanding pressure applications.
Q
When should I choose stainless steel grades like F316L over F304L?
F316L contains molybdenum (2–3%), which significantly enhances its resistance to chloride-induced pitting and crevice corrosion compared to F304L. F316L is recommended for applications involving seawater, chemical processing, or environments with high chloride concentrations, while F304L is suitable for general corrosion-resistant applications.
Q
What are the advantages of alloy steel grades such as F91 and F92?
ASTM A182 F91 and F92 are chromium-molybdenum alloy steels specifically designed for high-temperature, high-pressure service such as power generation and petrochemical industries. They offer excellent creep resistance, oxidation resistance, and long-term mechanical strength at elevated temperatures, making them ideal for critical piping systems.
Q
What does the sealing face type RF, FF, and FTJ mean?
RF (Raised Face) is the most common flange face type, providing a concentrated seating area for the gasket. FF (Flat Face) uses the entire flange face as the seating surface, commonly used with cast iron equipment. FTJ (Female Tongue & Groove / Ring Type Joint) provides a precision-machined groove for ring gaskets, ensuring a high-integrity seal in high-pressure and high-temperature applications.
Q
What is the application difference between ASTM A350 LF2 and LF3?
Both ASTM A350 LF2 and LF3 are low-temperature carbon steel forgings. LF2 is suitable for service down to -46°C (-50°F), while LF3 provides better impact toughness at even lower temperatures, down to -101°C (-150°F). LF3 is typically chosen for cryogenic or extremely cold service environments.
Q
Is duplex stainless steel such as F51 or F53 suitable for offshore applications?
Yes. ASTM A182 F51 (UNS S31803, Duplex 2205) and F53 (UNS S32750, Super Duplex) offer an excellent combination of high strength and outstanding corrosion resistance, particularly against chloride stress corrosion cracking. They are widely used in offshore oil and gas, subsea, and marine environments where both mechanical performance and corrosion resistance are critical.