Carbon steel elbow and pipe relationship

Carbon steel elbow and pipe relationship  

Carbon steel elbow is a metal pipe that changes the direction of the carbon steel pipe.  The connection mode is threaded and welded.  According to the Angle, there are three kinds of 45° and 90°180° commonly used, in addition according to the engineering needs also include 60° and other abnormal Angle elbow.  Elbow materials are cast iron, stainless steel, alloy steel, malleable iron, carbon steel, non-ferrous metals and plastics, etc.  The ways to connect the pipe are: direct welding (common way) flange connection, hot melt connection, electric melt connection, thread connection and socket type connection.  According to the production process can be divided into: welding elbow, stamping elbow, push elbow, casting elbow and so on.  Other names: 90 degree bend, right Angle bend, love bend and so on.  Carbon steel elbow can be divided into long radius elbow and short radius elbow according to their radius of curvature.  Long radius elbow refers to its radius of curvature equal to 1.5 times the outer diameter of the pipe, that is, R=1.5D.  Short radius elbow means that its radius of curvature is equal to the outer diameter of the pipe, that is, R= 1.0d.  (D is elbow diameter, R is radius of curvature.  D can also be expressed in terms of multiples.  According to the pressure grade, there are about 17 kinds of pipe standards, which are the same as those in the United States: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS;  Sch80, Sch100, Sch120, Sch140, Sch160, XXS, among which STD and XS are commonly used.  According to the Angle of the elbow, there are 45° elbow, 90° elbow and 180° elbow.  The standards are GB/T12459-2005, GB/T13401-2005, GB/T10752-1995, HG/T21635-1987, D-GD0219, etc.

 Carbon steel material can be divided into:

 10# 20# A3 Q235A 20g Q345B 20g 16Mn ASTM A234 ASTM A105 ST37 ASTM A403

With these materials as raw materials for the production of elbow can be called carbon steel elbow according to the Angle: 45°, 90°, 180° these three commonly used elbow, and other engineering needs, can be specially customized such as 60° or other angles.

The basic process of carbon steel elbow is: first welding a polygonal polygonal polygonal ring shell or closed at both ends of the polygonal fan shell, the internal pressure is filled with pressure medium, the internal pressure under the action of the cross section from polygon gradually become a circle, and finally become a circular ring shell.  As required, a circular shell can be cut into 4 90° elbows or 6 60° elbows or other sizes. This process is suitable for manufacturing large elbows of any size with the ratio of middle diameter to inner diameter of elbows greater than 1.5 times. It is