In the piping system, the elbow is the pipe that changes the direction of the pipe. According to the angle, there are 45 degrees and 90 degrees, 180 degrees, three most commonly used, in addition, according to the project needs, including 60 degrees and other non normal angle elbow. Stainless steel elbow is different from carbon steel elbow, the main material is different, the chemical composition of it will keep the elbow surface for a long time, will not rust, will not be corrosion