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China Industrial Weld Neck Flange Factory - High-Pressure Pipe Connection Suppliers for Oil & Gas 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
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 for piping applications, while A105N indicates the material has been normalized — a heat treatment process that improves mechanical properties and ensures greater uniformity in the steel's grain structure.
Q
When should I choose Stainless Steel grades like 316L or 904L over standard Carbon Steel?
Stainless steel grades such as 316L and 904L are recommended for applications involving corrosive media, high-humidity environments, or chemical processing. 904L, in particular, offers superior resistance to sulfuric acid and chloride-induced corrosion compared to standard 316L.
Q
What are Alloy Steel grades such as F91 and F92 typically used for?
ASTM A182 F91 and F92 are high-chrome alloy steels designed for high-temperature, high-pressure service — commonly found in power generation plants, boilers, and steam pipelines where elevated temperature strength and creep resistance are critical requirements.
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) is used when connecting to cast iron or other brittle flanges to prevent bending stress. FTJ (Female Tongue & Groove) offers a more precise sealing arrangement, ideal for high-pressure or hazardous fluid applications.
Q
Is ASTM A350 LF2 suitable for low-temperature service?
Yes. ASTM A350 LF2 is specifically designed for low-temperature service, offering good impact toughness at temperatures as low as -50°F (-46°C). It is widely used in cryogenic and cold-climate pipeline applications.
Q
What is the advantage of duplex stainless steel grades like F51 and F53?
ASTM A182 F51 (Duplex 2205) and F53 (Super Duplex 2507) offer a two-phase microstructure combining austenite and ferrite, providing approximately twice the strength of standard austenitic stainless steels, along with excellent resistance to pitting, crevice corrosion, and stress corrosion cracking — ideal for offshore and marine environments.