China Suppliers Factory ASME B16.5 Class 150 Raised Face Slip-on Pipe Flange for Low-Pressure Applications
ASTM A105 refers to standard carbon steel forgings for piping components, while ASTM A105N denotes the same material in a normalized heat-treated condition. The "N" suffix indicates normalization, which refines the grain structure and improves mechanical properties such as toughness and ductility, making A105N more suitable for demanding service conditions.
F316L is a low-carbon variant of F316 stainless steel. The reduced carbon content (≤0.03%) minimizes the risk of sensitization and intergranular corrosion during welding, making F316L the preferred choice for welded assemblies or environments with high corrosion risk, such as chloride-bearing or acidic media.
ASTM A182 F51 (Duplex 2205) and F53 (Super Duplex 2507) are engineered for high-strength, corrosion-resistant applications. They are widely used in offshore oil and gas, seawater handling, chemical processing, and desalination plants due to their exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking.
F91 (9Cr-1Mo-V) and F92 (9Cr-2W) are advanced chromium-molybdenum alloy steels designed for high-temperature, high-pressure piping systems such as power generation and petrochemical plants. They offer superior creep resistance, oxidation resistance, and long-term mechanical strength at elevated temperatures compared to conventional alloy steels like F11 or F22.
RF (Raised Face) is the most common type, featuring a raised sealing area that concentrates bolt load on the gasket for a reliable seal. FF (Flat Face) has a flush sealing surface used when mating with flat-faced flanges, often in low-pressure applications. FTJ (Female Tongue & Groove) provides a precision interlocking fit that fully confines the gasket, delivering superior leak-tightness for critical or high-pressure services.
For low-temperature applications, ASTM A350 LF2 and LF3 are specifically designed carbon steel grades with guaranteed impact toughness at sub-zero temperatures. LF2 is suitable for service down to -46°C (-50°F), while LF3 offers even lower temperature performance. These grades are commonly used in cryogenic pipelines, LNG facilities, and cold-climate process plants.