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China ASME B16.5 Class 150/300 Forged Steel Socket Weld Flanges Supplier & Factory
Material Grade
| ⬡Carbon Steel |
ASTM A105
ASTM A105N
ASTM A350 LF2
ASTM A350 LF3
ASTM A694 F42
ASTM A694 F46
ASTM A694 F56
ASTM A694 F60
ASTM A694 F65
|
| ◈Stainless Steel |
ASTM A182 F304
ASTM A182 F304L
ASTM A182 F304H
316
316L
310S
317
347
904L
ASTM A182 F51
ASTM A182 F53
ASTM A182 F44
|
| ⬢Alloy Steel |
ASTM A182 F11
ASTM A182 F12
ASTM A182 F5
ASTM A182 F9
ASTM A182 F91
ASTM A182 F92
|
| ◉Sealing Face |
RF
FF
FTJ
|
Frequently Asked Questions
Q
What is the difference between ASTM A105 and ASTM A105N material grades?
ASTM A105 is a standard specification for carbon steel forgings used in piping applications, while ASTM A105N indicates the same material that has undergone a normalizing heat treatment process. The "N" suffix means the forging has been normalized, which refines the grain structure, improves mechanical properties, and enhances toughness — making A105N preferable for applications requiring higher reliability.
Q
What is the advantage of using ASTM A182 F316L over F316 in stainless steel flanges?
ASTM A182 F316L has a lower carbon content (≤0.03%) compared to standard F316 (≤0.08%). This reduced carbon content significantly minimizes the risk of sensitization and intergranular corrosion, especially in welded assemblies. F316L is therefore recommended for applications involving welding or exposure to corrosive environments where long-term durability is critical.
Q
When should ASTM A350 LF2 or LF3 carbon steel be selected instead of A105?
ASTM A350 LF2 and LF3 are specifically designed for low-temperature service applications. Unlike A105, which is suitable for ambient to elevated temperatures, LF2 and LF3 grades are impact-tested at low temperatures (LF2 at -50°F / -46°C and LF3 at -150°F / -101°C), making them the correct choice for cryogenic pipelines, cold climate installations, and liquefied gas systems.
Q
What are the sealing face types RF, FF, and FTJ, and how do they differ?
RF (Raised Face) is the most common flange face type, featuring a raised ring area that concentrates bolt load on a smaller gasket area for a better seal. FF (Flat Face) has a completely flat sealing surface and is typically used when connecting to cast iron or other brittle material flanges to avoid bending stress. FTJ (Female Tongue and Groove Joint) provides a self-aligning, highly reliable seal by interlocking male and female faces, commonly used in high-pressure or critical service applications.
Q
What makes ASTM A182 F91 alloy steel suitable for high-temperature applications?
ASTM A182 F91 is a chromium-molybdenum-vanadium alloy steel specifically engineered for high-temperature, high-pressure service. Its composition (9% Cr, 1% Mo with vanadium and niobium additions) provides excellent creep resistance, oxidation resistance, and long-term strength retention at temperatures up to 650°C (1200°F). This makes it widely used in power generation, petrochemical plants, and steam piping systems.
Q
What is ASTM A182 F51 (Duplex Stainless Steel) and what are its key benefits?
ASTM A182 F51 refers to UNS S31803 / S32205 Duplex Stainless Steel, which has a two-phase microstructure of approximately equal parts austenite and ferrite. This dual structure provides roughly twice the yield strength of standard austenitic grades like 304 or 316, combined with excellent resistance to chloride stress corrosion cracking and pitting corrosion. It is widely used in offshore, chemical processing, and desalination industries where both strength and corrosion resistance are essential.