Elbow according to material divided into carbon steel elbow, cast steel elbow, alloy steel elbow, stainless steel elbow, copper bend, aluminum alloy elbow etc.
Alloy elbow uses very extensive. Alloy bend of ordinary bronze material is common in general water pipe , but with the improvement of living standards, a lot of water pipes have switched to stainless steel elbow. Because of manganese steel is under impact extrusion materials such as wear the good performance, manganese steel material alloy bend are usually used in concrete conveying duct.
 

Reducing elbow is a special kind of elbow pipe fitting, the both ends of the cross section radius of this elbow are different. It is mainly used to connect two pipes of different paragraphs face radius , or used for changing the pipe diameter .