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China Factory Suppliers for ASME B16.5 Forged Carbon Steel Raised Face (RF) Blind Flange
Material Grade
| 🔩Carbon Steel | ASTM A105 / A105N | 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 |
| ⚙️Alloy Steel | ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 |
| 🔘Sealing Face | RF | FF | FTJ |
Frequently Asked Questions
Q
What is the difference between ASTM A105 and ASTM A105N?
ASTM A105 is a standard specification for carbon steel forgings used in piping components, while ASTM A105N refers to the same material that has been normalized — a heat treatment process that refines the grain structure and improves mechanical properties for more demanding applications.
Q
When should I choose stainless steel over carbon steel for flanges?
Stainless steel grades such as F304, F316, or 904L are recommended when the application involves corrosive media, high humidity environments, food-grade processing, or elevated temperature conditions. Carbon steel is more cost-effective for general-purpose, non-corrosive piping systems.
Q
What are the typical applications for ASTM A182 F51 and F53 duplex stainless steel?
ASTM A182 F51 (2205 Duplex) and F53 (Super Duplex 2507) are widely used in offshore oil and gas platforms, desalination plants, chemical processing, and marine environments where both high strength and excellent resistance to chloride stress corrosion cracking are required.
Q
What does the sealing face type RF, FF, or FTJ mean?
RF (Raised Face) is the most common type, providing a concentrated seating area for gaskets. FF (Flat Face) is used when connecting to flat-face flanges to avoid bending stress. FTJ (Female Tongue and Groove Joint) offers a more secure seal and is used in high-pressure or critical sealing applications.
Q
What is ASTM A694 and which grades are available?
ASTM A694 covers carbon and alloy steel forgings specifically intended for high-pressure transmission service flanges, fittings, valves, and parts. Available grades include F42, F46, F56, F60, and F65, where the number indicates the minimum yield strength in ksi (thousands of pounds per square inch).
Q
What are ASTM A182 alloy steel grades used for?
ASTM A182 alloy steel grades such as F11, F12, F5, F9, F91, and F92 are designed for high-temperature service in power generation, petrochemical, and refinery applications. These grades offer superior creep resistance and strength at elevated temperatures compared to standard carbon steel.