Carbon steel elbow is divided according to its radius of curvature

　　Carbon steel elbow is divided according to its radius of curvature, which can be divided into long radius elbow and short radius elbow. Long radius elbow refers to its radius of curvature is equal to 1.5 times the diameter of the tube, that is, R = 1.5D. Short radius elbow means that the radius of curvature is equal to the outer diameter of the pipe, that is, R = 1.0D. (D is the diameter of the elbow, R is the radius of curvature) if divided by the pressure rating to about 17 species, and American Standard pipe is the same: sch5s, sch10s, sch10, sch20, sch30, sch40s, STD, sch40, sch60, sch80s, XS; sch80, sch100, sch120, sch140, sch160, XXS, which is the most commonly used is two kinds of STD and XS.

　　According to the angle of the elbow, 45 degree elbow, 90 degree elbow and 180. Carbon steel elbow of the basic process is: first welding a cross-sectional polygon polygon ring shell or closed at both ends of the multiple edges of fan-shaped shells, interior flushes the full pressure medium, subjected to internal pressure, internal pressure under the effect of cross section by the polygon gradually became round, eventually becoming a circular ring shells. According to the need, a circular ring shells can be cut into four 90 101 elbow or six 60 101 elbow or other specifications of the elbow and the technology application in manufacturing bend diameter and bend diameter ratio greater than 1.5 any specification of large elbow, is currently making the ideal method for the large carbon steel elbow.

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