The elbow is the most commonly used product specifications, I plant the 45-degree bend steel products have the following features: long-term pressure resistance, low thermal shock resistance, environmental protection, recyclability. Elbow is commonly used in a plumbing installation connecting pipe for connecting the pipe bend for changing direction of the pipe. Other names: 90 ° elbow, right angle bend, stamping elbow, pressing elbow, elbow mechanism, welding elbow. Purpose: connect two identical or different nominal pipe diameter, so the pipeline for 90 °, 45 °, 180 ° and various degrees of turn. Bending radius less than or equal to 1.5 times the diameter of the part of the elbow, is larger than 1.5 times the diameter of the part of elbow.