Concept of steel pipe fittings: Steel pipe fittings are parts that connect steel pipes to pipelines.

Classification of steel pipe fittings by use
1. Steel pipe fittings used to connect steel pipes include: flanges, unions, pipe clamps, ferrules, throat clamps, etc. Cold drawn tees
2. Steel pipe fittings that change the direction of steel pipes: elbows, elbows
3. Steel pipe fittings that change the diameter of steel pipes: reducers (reducing pipes), reducing elbows, branch platforms, reinforcement pipes
4. Steel pipe fittings that increase pipeline branches: tees, crosses
5. Steel pipe fittings used for pipeline sealing: gaskets, raw tape, hemp, flange blind plates, pipe plugs, blind plates, heads, welding plugs
6. Steel pipe fittings used to fix pipelines: clamps, towing hooks, lifting rings, brackets, brackets, pipe clamps, etc.

According to the connection method, they can be divided into four categories: socket-type steel pipe fittings, threaded steel pipe fittings, flange steel pipe fittings, and welded steel pipe fittings. They are mostly made of the same materials as steel pipes. They include elbows, flanges, tees, crosses, and reducers. Elbows are used at the bends of pipes; flanges are used to connect steel pipes, connected to the ends of pipes; tees are used at the places where three steel pipes meet; crosses are used at the places where four steel pipes meet; and reducers are used at the places where two steel pipes of different diameters are connected.