Carbon steel flanges are widely used in various industries due to their durability, strength, and resistance to corrosion. There are different types of carbon steel flanges available in the market, each with its unique features and applications. Here are some of the most common types of carbon steel flanges:

1. Weld Neck Flanges: These flanges are designed to be welded to the pipe, providing a strong and leak-proof connection. They have a long tapered hub that gradually merges with the pipe, making them ideal for high-pressure applications.
2. Slip-On Flanges: These flanges are easy to install and remove, making them a popular choice for low-pressure applications. They slide over the pipe and are then welded in place.
3. Blind Flanges: These flanges are used to seal the end of a pipe or valve. They are commonly used in piping systems where maintenance or inspection is required.
4. Threaded Flanges: These flanges have threads on the inside and outside, allowing them to be screwed onto the pipe. They are commonly used in low-pressure applications.
5. Socket Weld Flanges: These flanges have a socket that fits over the pipe, providing a strong and leak-proof connection. They are commonly used in high-pressure applications.
6. Lap Joint Flanges: These flanges are used in conjunction with a stub end, allowing the flange to rotate freely around the stub end. They are commonly used in piping systems where alignment is critical.

7. Butt welding flange: butt welding flange is a commonly used carbon steel flange, which is usually used to connect large diameter pipes. The connection method of the butt welding flange is to connect the two flanges together with bolts to form a sealed connection.

8. Stretch flange: A stretch flange is a special flange, and its connection method is to tighten two flanges with bolts. Stretched flanges are usually used in high-pressure, high-temperature piping systems.

9. Welding flange: A welding flange is a common carbon steel flange, which is usually used to connect pipes of the same diameter. The connection method of welding a flange is to connect two flanges together by welding to form a sealed connection.

10. Blind carbon steel flange: Blind carbon steel flange is a flange for sealing pipelines, usually used in pipeline maintenance, cleaning, testing, and other occasions. Its structure is similar to ordinary carbon steel flanges, but there are no center holes and screw holes, and it can be fixed by bolts or welding. Common standards include GB/T9115.1-2000, ANSI B16.5, DIN 2527, JIS B2291, etc.

Overall, the choice of carbon steel flange depends on the specific application and the requirements of the piping system. It is important to select the right type of flange to ensure a safe and reliable connection.

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