Elbow is a pipe fitting that changes the direction of the pipeline. According to the Angle, there are 45° and 90°180° three most commonly used, in addition, according to the engineering needs also include 60° and other abnormal Angle bend. Elbow materials are cast iron, stainless steel, alloy steel, malleable iron, carbon steel, nonferrous metals and plastics. The method of connection with pipe is: direct welding (the most common way) flange connection, hot welding connection, electric welding connection, threaded connection and socket connection, etc. According to the production process can be divided into: welding elbow, stamping elbow, push elbow, casting elbow, butt welding elbow. Other names :90 degree bend, right Angle bend, love and bend, etc.