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Carbon Steel A105 NPT Threaded Pipe Flange with Raised Face - China Suppliers & Factory for Quality Flanges
Material Grade
| Carbon Steel | ASTM A105 / A105N ASTM A350 LF2 / LF3 ASTM A694 F42 / 46 / 56 / 60 / 65 |
| Stainless Steel | ASTM A182 F304 / 304L / 304H 316 / 316L 310S 317 347 904L ASTM A182 F51 F53 F44 |
| Alloy Steel | ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 |
| Sealing Face |
RF
FF
FTJ
|
Frequently Asked Questions
Q
What is the difference between ASTM A105 and ASTM A105N?
ASTM A105 is a standard specification for carbon steel forgings for piping applications, while A105N indicates the material has been normalized — a heat treatment process that improves toughness and mechanical properties, making it suitable for more demanding pressure and temperature conditions.
Q
What are ASTM A350 LF2 and LF3 used for?
ASTM A350 LF2 and LF3 are low-temperature carbon and low-alloy steel forgings primarily used in piping components such as flanges, fittings, and valves that require notch toughness testing. LF3 offers better low-temperature performance compared to LF2.
Q
What is the difference between 304L and 316L stainless steel?
Both 304L and 316L are low-carbon stainless steel grades. 316L contains added molybdenum (2–3%), which significantly improves its resistance to chloride corrosion and pitting, making it the preferred choice for marine, chemical, and offshore environments.
Q
What are the three sealing face types — RF, FF, and FTJ?
RF (Raised Face) is the most common flange face type, concentrating bolt load on a smaller area for a better seal. FF (Flat Face) has the gasket covering the entire flange face and is used with cast iron or brittle equipment. FTJ (Female Tongue and Groove Joint) provides a self-aligning, high-integrity seal often used in high-pressure or critical service applications.
Q
What is ASTM A182 F91 alloy steel and when is it used?
ASTM A182 F91 is a chrome-moly alloy steel (9Cr-1Mo-V) known for its exceptional high-temperature strength and oxidation resistance. It is widely used in power generation, petrochemical, and high-pressure steam piping systems operating at elevated temperatures.
Q
Why choose duplex stainless steel such as ASTM A182 F51 or F53?
Duplex stainless steels like F51 (2205) and F53 (2507) offer a two-phase microstructure combining austenite and ferrite, providing approximately twice the strength of standard austenitic grades. They deliver excellent resistance to stress corrosion cracking, pitting, and crevice corrosion, making them ideal for offshore, subsea, and aggressive chemical service environments.