Stainless Steel Flange Types, Materials & Standards | Metal Flange Supplier

        In the petrochemical, energy pipeline, shipbuilding, power generation, municipal, and industrial equipment sectors, stainless steel flanges are indispensable connecting components in stainless steel piping systems.The type of flange selected not only affects installation efficiency but also directly impacts sealing performance, system safety, and long-term operating costs. As a supplier specializing in metal pipe connectors, Metal offers a wide range of flange products in various types, standards, and stainless steel materials to meet the application needs of different engineering scenarios.

        Ⅰ. Types of stainless steel flanges classified by structural form

        1. Slip-on Flange: Slip-on flanges have a simple structure. During installation, the pipe is inserted into the flange hole and then welded.  They are easy to install and suitable for medium-low pressure and normal temperature conditions.

        2. Weld Neck Flange: Weld neck flanges are connected to the pipe through a full penetration weld at the bevel.They offer uniform stress distribution and excellent pressure and temperature resistance,and are commonly used in high-pressure, high-temperature, or safety-critical systems.

        3. Socket Weld Flange: Socket weld flanges are suitable for small-diameter, high-pressure pipelines.They offer high installation accuracy and good sealing performance,and are commonly used in instrument pipeline or fine chemical system.

        4. Threaded Flange: Connected to the pipe via internal threads, requiring no welding.Suitable for situations where on-site welding is not permitted or frequent disassembly is required, but generally used in low-pressure systems.

        5. Blind Flange: Blind flanges are primarily used to seal off pipe ends or equipment interfaces,facilitating system maintenance and pressure testing.They are an important safety component in piping systems.

        Ⅱ. Stainless steel flanges classified by sealing surface type

        The sealing surface type determines the sealing performance of the flange.  Choosing the appropriate sealing surface type helps improve the long-term reliability of the system. Metal offers a variety of common sealing surface designs:

        • RF (Raised Face Flange): The most widely used, suitable for most industrial applications.

        • FF (Flat Face Flange): Commonly used in cast iron flanges or low-pressure systems.

        • RTJ (Ring Type Joint Flange): Suitable for high-pressure, high-temperature, and harsh operating conditions.

        • MF/FM (Male/Female Face): Enhances sealing stability and reduces the risk of gasket displacement.

        Ⅲ. Stainless steel material selection and applicable scenarios

        The performance of stainless steel flanges is closely related to the material. The selection of material should be evaluated based on the medium composition, temperature, pressure, and service life. Metal offers a variety of commonly used stainless steel grades:

        304 / 304L: General-purpose stainless steel with good corrosion resistance, suitable for food, chemical, and general industrial applications.

        316 / 316L: Contains molybdenum, offering superior resistance to chloride ion corrosion, commonly used in marine engineering, chemical, and pharmaceutical industries.

        Duplex stainless steel: Combines high strength with excellent corrosion resistance, suitable for high-pressure and corrosive environments.

        Ⅳ. Implementation standards and size range

        In international engineering projects, stainless steel flanges typically need to comply with specific standards.Metal manufactures and supplies flanges according to various international standards, including ASME/ANSI, DIN, EN, BS, JIS, and GOST, covering a wide range of sizes from small to large diameters, facilitating seamless integration with global piping systems.

        Ⅴ. The supply advantages of Metal stainless steel flanges.

        Metal provides a wide variety of stainless steel flange products and also supports customized solutions.Through strict quality control and standardized production processes, we ensure that our flanges meet engineering requirements in terms of dimensional accuracy, welding performance, and durability.We are committed to providing professional stainless steel flange products and technical support to global customers, contributing to the stable operation of various engineering projects. Please feel free to contact our professional team!