Cast elbow is a kind of pipe fitting used to change the direction of the pipe in the piping system, and its manufacturing process mainly includes casting process. Cast elbow can be made by casting process, which is divided into two main types: malleable cast iron elbow and ductile iron elbow. Malleable cast iron elbow is also called malleable cast iron elbow, which is one of the most common threaded elbows. Its specifications usually range from 1/2 to 4 inches, and it is mainly used in heating, water pipes, gas pipes and other scenarios.