Carbon steel elbow is mainly 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. if divided by the pressure rating to about 17 species, pipe specification for the United States and is the same: sch5s, sch10s, sch10, sch20, sch30, sch40s, STD, sch40, sch60, sch80s, XS; sch80, sch100, sch120, sch140, sch160, XXS, during which the most common is two kinds of STD and XS. According to the point of view of the elbow, there are 45 degree elbow, 90 degree elbow and 180 degree elbow.
The elbow made of these materials for the raw material can be called a carbon steel elbow.According to point of view points: 45 degrees, 90 degrees, 180 degrees, these three kinds of elbow, there are engineering requirements, can be customized, such as 60 degree or other points of view, etc..
Connecting methods of steel pipe with carbon steel pipe: welding, flange connection, threaded connection, socket connection, etc..According to the technical method can be divided: welding elbow, stamping elbow, casting elbow number.
Use: connect two pipes, so that the pipe can be a right angle, 45 degrees or 180 degrees.Production standards: GB, American Standard, Japanese standard, German standard, Russian standard.
Carbon steel elbow, the fundamental technology and process is: first welding a cross-section for polygon edge ring shell or two off 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, at the end of a circular ring shells. According to the demand, a circular ring shells can cut into four 90 degree elbow or six 60 DEG elbow or other standard elbow, the technology application in elbow making diameter and bend diameter ratio greater than 1.5 times of any standard large elbow is made on the current large carbon steel elbow ideal way.
The advantages of the carbon steel elbow making technology are mainly in the following aspects:
No tube material, can save pipe making equipment and the mold expense, and can get arbitrarily large diameter and wall thickness relatively thin carbon steel elbow.
The blank is a flat plate or a curved surface, so the blanking is simple, the precision is simple, and the assembling and welding are convenient. Because these two reasons, can shorten the production cycle, production costs greatly decreased. Because no special equipment is required, and is especially suitable for processing large carbon steel elbow in the field.
Carbon steel elbow is suitable for oil, natural gas, chemical industry, hydropower, construction and boiler and other professional pipeline system.