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China Slip-on Flange ASME B16.5 Class 150 RF - Quality Suppliers & Reliable Factory
Material Grade
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Carbon Steel
ASTM A105 / A105N | 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
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Alloy Steel
ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
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Sealing Face
RF | FF | FTJ
Frequently Asked Questions
Q
What is the difference between ASTM A105 and ASTM A105N?
ASTM A105 is the standard specification for carbon steel forgings used in piping applications. ASTM A105N refers to the same material that has undergone a normalizing heat treatment process, which refines the grain structure and improves mechanical properties such as toughness and ductility.
Q
When should I choose stainless steel grades like 316L over 304L?
316L is recommended for environments with higher chloride exposure or more aggressive corrosive media, such as seawater or chemical processing. 304L is suitable for general corrosion resistance applications where cost efficiency is also a consideration.
Q
What applications are ASTM A182 F51 and F53 duplex stainless steels used for?
F51 (Duplex 2205) and F53 (Super Duplex 2507) are used in demanding environments such as offshore oil and gas, desalination plants, and chemical processing, where high strength combined with excellent corrosion resistance — especially against pitting and crevice corrosion — is required.
Q
What are the key differences between RF, FF, and FTJ sealing faces?
RF (Raised Face) is the most commonly used sealing face, concentrating bolt load over a smaller area for a reliable seal. FF (Flat Face) is used when mating with flat-faced flanges, particularly with cast iron equipment. FTJ (Female Tongue and Groove Joint) provides a more secure seal for high-pressure and critical applications by interlocking the flange faces.
Q
What is the advantage of alloy steel grades such as ASTM A182 F91 and F92?
F91 and F92 are advanced creep-resistant alloy steels designed for high-temperature service, commonly used in power generation and petrochemical industries. They offer superior elevated-temperature strength and oxidation resistance compared to standard carbon or low-alloy steels.
Q
How do I select the right material grade for my application?
Material selection depends on several factors including operating temperature, pressure, the nature of the media (corrosive, abrasive, etc.), and applicable industry standards. Carbon steel grades are suitable for standard conditions, alloy steels for high-temperature service, and stainless or duplex steels for corrosive environments. Consulting with a qualified engineer or supplier is recommended for critical applications.