UNS S31803 Flanges & Types

UNS S31803 is a duplex stainless steel grade that is commonly used in various industrial applications. Duplex stainless steels exhibit a combination of excellent corrosion resistance and high strength, making them suitable for demanding environments.

When it comes to flanges, UNS S31803 flanges are available in different types to accommodate various piping and connection requirements. Here are some common types of flanges made from UNS S31803:

1. Weld Neck Flanges (WN): These flanges have a long tapered hub that provides reinforcement to the flange and helps reduce stress concentration at the base of the flange. Weld neck flanges are typically used in high-pressure and high-temperature applications.
2. Slip-On Flanges (SO): Slip on flanges have a flat face and are slipped over the pipe, then welded in place. They are easy to align and install, making them a popular choice for low-pressure applications.
3. Blind Flanges (BL): Blind flanges are solid discs used to seal off or terminate the end of a piping system. They are typically used when future expansion or maintenance may be required. Blind flanges can be easily bolted on and provide a reliable closure.
4. Socket Weld Flanges (SW): Socket weld flanges have a socket-like recess into which the pipe is inserted and then welded. They are used for smaller pipe sizes and offer good fatigue resistance and flow characteristics.
5. Threaded Flanges (TH): Threaded flanges have internal threads that allow them to be screwed onto the pipe. They are commonly used for small-diameter piping systems or low-pressure applications.
6. Lap Joint Flanges (LJ): Lap joint flanges consist of two components: a stub end and a backing flange. The stub end is welded to the pipe, while the backing flange is free to rotate. They are used in systems that require frequent dismantling for inspection or cleaning.

These are some of the commonly available types of flanges made from UNS S31803 duplex stainless steel. The choice of flange type depends on the specific application, pressure rating, temperature, and other factors. It's important to consult with a qualified engineer or refer to industry standards and specifications to select the appropriate flange type for your needs.

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