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China ASME B16.5 Class 150 RF Slip-on Pipe Flange Suppliers & Factory for Industrial Applications
Material Grade
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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
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Stainless Steel
ASTM A182 F304 / 304L / 304H, 316 / 316L, 310S, 317, 347, 904L
ASTM A182 F51, F53, F44
ASTM A182 F51, F53, F44
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Alloy Steel
ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Frequently Asked Questions
Q
What is the difference between ASTM A105 and ASTM A105N?
ASTM A105 is the standard specification for carbon steel forgings for piping applications, while A105N indicates that the material has undergone normalizing heat treatment. The "N" suffix means the forging is normalized to improve mechanical properties and relieve internal stresses, making it suitable for more demanding service conditions.
Q
When should I choose ASTM A350 LF2 or LF3 over A105?
ASTM A350 LF2 and LF3 are specifically designed for low-temperature service applications where impact toughness at sub-zero temperatures is critical. If your piping system operates in cryogenic or cold-weather environments, A350 LF grades are the preferred choice over standard A105 carbon steel.
Q
What are the advantages of using 316L stainless steel over 304L?
ASTM A182 F316L contains molybdenum (typically 2–3%), which provides significantly better resistance to pitting and crevice corrosion, especially in chloride-containing environments such as seawater or chemical processing. F304L is a cost-effective option for general corrosion resistance, while F316L is recommended for more aggressive or corrosive media.
Q
What is the application of ASTM A182 F91 alloy steel?
ASTM A182 F91 is a chromium-molybdenum-vanadium alloy steel widely used in high-temperature, high-pressure power generation and petrochemical applications. It offers excellent creep resistance and long-term strength at elevated temperatures, making it a preferred material for steam piping, boiler components, and turbine 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 full flange face and is typically used with full-face gaskets in lower-pressure systems or when mating with cast iron flanges. FTJ (Female and Tongue & Groove Joint) provides precise gasket alignment and is used in high-pressure or critical sealing applications where leakage prevention is paramount.
Q
What does ASTM A694 F65 mean and where is it used?
ASTM A694 covers carbon and alloy steel forgings for high-pressure transmission service flanges, fittings, valves, and parts. The designation "F65" refers to the minimum yield strength of 65,000 psi (65 ksi). These materials are commonly used in high-pressure oil and gas pipeline systems, including offshore and subsea applications, where standard carbon steel grades may not provide sufficient strength.