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China A105 Carbon Steel Threaded Pipe Flange Suppliers - Raised Face Flanges from Factory
Material Grade
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Carbon Steel
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ASTM A105 / A105N | ASTM A350 LF2 / LF3 | ASTM A694 F42 / 46 / 56 / 60 / 65 |
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Stainless Steel
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ASTM A182 F304 / 304L / 304H, 316 / 316L, 310S, 317, 347, 904L | ASTM A182 F51, F53, F44 |
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Alloy Steel
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ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 |
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Sealing Face
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RF FF FTJ |
Frequently Asked Questions
Q
What is the difference between ASTM A105 and ASTM A105N in carbon steel flanges?
ASTM A105 and A105N refer to the same material specification for carbon steel forgings used in piping components. The "N" suffix indicates that the material has undergone a normalizing heat treatment process, which improves its mechanical properties and ensures greater uniformity in grain structure — making A105N preferred for higher-pressure and critical applications.
Q
When should I choose stainless steel grades such as 316L over 304L?
Grade 316L offers superior corrosion resistance compared to 304L, particularly in chloride-rich or marine environments and chemical processing applications. The addition of molybdenum in 316/316L significantly reduces pitting and crevice corrosion. For general-purpose use with moderate corrosion exposure, 304L is typically sufficient and more cost-effective.
Q
What are the typical applications for ASTM A182 F51 (Duplex Stainless Steel) flanges?
ASTM A182 F51 is a duplex stainless steel grade offering a two-phase microstructure (austenite and ferrite), providing excellent resistance to stress corrosion cracking and pitting. It is widely used in oil and gas, chemical processing, desalination plants, and offshore platforms where both high strength and corrosion resistance are required.
Q
What is the difference between RF, FF, and FTJ sealing face types?
RF (Raised Face) is the most common flange face type, featuring a raised seating area that concentrates bolt load on the gasket for a reliable seal. FF (Flat Face) has the entire flange face in the same plane, typically used with full-face gaskets and cast iron equipment. FTJ (Female Tongue and Groove Joint) provides a self-aligning, highly reliable seal for critical services where leakage prevention is paramount.
Q
Which alloy steel grade is suitable for high-temperature service?
ASTM A182 F91 and F92 are chromium-molybdenum alloy steels specifically designed for elevated temperature service, commonly used in power generation and petrochemical industries at temperatures up to 650°C (1200°F). F11 and F12 are suitable for moderate high-temperature applications, while F5 and F9 offer improved oxidation resistance at higher temperatures.
Q
How do I select the right material grade for my flange application?
Material selection depends on several key factors: operating temperature and pressure, the type of media (corrosive, abrasive, or inert), environmental conditions (e.g., offshore, chemical), applicable industry standards, and budget. Carbon steel grades are ideal for general-purpose and low-temperature applications; stainless steel grades suit corrosive environments; alloy steel grades are chosen for high-temperature or high-pressure service. Always consult engineering specifications and relevant ASTM standards before making a final selection.