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China Suppliers Factory ASME B16.5 Class 150 Raised Face Slip-on Pipe Flanges for Efficient Pipeline Connections
Material Grade
🔩
Carbon Steel
CS
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
⚙️
Stainless Steel
SS
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
🛠️
Alloy Steel
AS
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 the standard specification for carbon steel forgings used in piping components. The "N" suffix in A105N indicates that the material has undergone a normalizing heat treatment process, which improves mechanical properties such as toughness and uniformity of the grain structure.
Q
When should I choose ASTM A350 LF2 or LF3 over A105?
ASTM A350 LF2 and LF3 are low-temperature carbon steel grades designed for use in cryogenic or sub-zero service conditions. They are preferred over A105 when the application involves temperatures below −20°F (−29°C), where impact toughness at low temperatures is a critical requirement.
Q
What are the advantages of using 316L stainless steel over 304L?
ASTM A182 F316L contains molybdenum (typically 2–3%), which significantly enhances its resistance to pitting and crevice corrosion, especially in chloride-rich environments. It is a preferred choice over 304L in marine, chemical processing, and pharmaceutical applications where superior corrosion resistance is required.
Q
What applications are ASTM A182 F11 / F12 alloy steel grades suitable for?
ASTM A182 F11 and F12 are chromium-molybdenum (Cr-Mo) alloy steel grades designed for high-temperature and high-pressure service. They are commonly used in power generation plants, petrochemical refineries, and pressure vessel applications where elevated temperature strength and oxidation resistance are essential.
Q
What is the difference between RF, FF, and FTJ sealing face types?
RF (Raised Face) is the most commonly used sealing face, where the gasket contacts a raised area to concentrate sealing pressure. FF (Flat Face) has the flange face flush with the bolting circle and is typically used with full-face gaskets in lower-pressure applications. FTJ (Female-Tongue and Groove Joint) provides a more precise self-aligning seal and is used in high-pressure or critical service conditions.
Q
Is ASTM A182 F51 a duplex stainless steel grade?
Yes, ASTM A182 F51 is a duplex stainless steel grade with a two-phase microstructure (austenite and ferrite). It offers higher strength than standard austenitic grades like 304 or 316, along with excellent resistance to stress corrosion cracking and pitting. It is widely used in offshore oil and gas, desalination, and chemical processing industries.