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China Suppliers Factory ASME B16.5 Class 150 Carbon Steel Lap Joint Flange (LJF) for Pipe Connection
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China Suppliers Factory ASME B16.5 Class 150 Carbon Steel Lap Joint Flange (LJF) for Pipe Connection

Lap Joint Flanges are essential components in piping systems, comprising two parts: a stub end welded to the pipe and a Lap Joint flange that slides onto the pipe before the stub end is welded. These flanges offer flexibility in maintenance and installation, making them a preferred choice for many applications, Manufactured from high-quality forged steel, our flanges serve as reliable connections between pipes, fittings, valves, and other components to create robust pipework systems. Flanges are typically welded to the ends of pipes or tubes, with a gasket inserted to ensure a tight seal. The assembly is secured with bolts and nuts, providing a strong and leak-proof connection, As a leading supplier in China, we pride ourselves on delivering top-notch Lap Joint Flanges that meet international standards. Our products come in a range of specifications to suit various industrial needs:, | **Parameter** | **Details** |, |-----------------------|------------------------------------------|, | Outside Diameter | 1/2~24 (DN15~DN600) |, | Class | PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100
Class 150, 300, 600, 900, 1500, 2500 lb |, | Standards | EN 1092-1, ANSI/ASME B16.5, DIN 2527, JIS B2220 |, Our factory employs stringent quality control processes to ensure that every Lap Joint Flange meets the highest standards of durability and performance. Trust us as your China supplier for all your flange needs, providing you with exceptional products and service

    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?
    A ASTM A105 is a standard specification for carbon steel forgings used in piping components, while ASTM A105N indicates that the material has undergone a normalizing heat treatment process, which improves its mechanical properties and toughness for higher-pressure applications.
    Q When should I choose Stainless Steel (e.g., 316L) over Carbon Steel (e.g., A105)?
    A Stainless steel grades such as 316L are preferred in corrosive environments, high-purity applications, or where resistance to oxidation and chemicals is required. Carbon steel like A105 is more suitable for general-purpose, non-corrosive piping systems where cost efficiency is a priority.
    Q What are Duplex and Super Duplex stainless steel grades (F51, F53, F44)?
    A F51 (Duplex 2205), F53 (Super Duplex 2507), and F44 (6Mo) are high-performance stainless steel grades offering excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. They are widely used in offshore, marine, and chemical processing industries.
    Q What applications are Alloy Steel grades (F11, F12, F91, F92) typically used for?
    A Alloy steel grades such as ASTM A182 F11, F12, F91, and F92 are designed for high-temperature and high-pressure service. They are commonly used in power generation, boiler systems, and petrochemical plants where elevated temperature strength and creep resistance are critical.
    Q What is the difference between RF, FF, and FTJ sealing faces?
    A RF (Raised Face) is the most common sealing face, concentrating bolt load on a smaller gasket area for a better seal. FF (Flat Face) is used when connecting to cast iron or non-metallic flanges to prevent flange bending. FTJ (Full-Face Tongue and Groove Joint) provides a more precise and secure seal, ideal for high-pressure or critical applications.
    Q How do I select the right material grade for my piping project?
    A Material selection depends on several key factors: operating temperature and pressure, the type of media being transported (corrosive, high-purity, etc.), environmental conditions, and applicable industry standards or codes (such as ASME, ASTM, or API). Consulting with a qualified engineer or our technical team is recommended to ensure the optimal grade is selected for your specific application.