what is the carbon steel elbow?

Let us learn what is the carbon steel elbow in this article

Carbon steel elbow

Carbon steel elbows are metal fittings that change the direction of the pipe on the carbon steel pipe. Connections are threaded and welded. Divided by angle, there are 45 ° and 90 ° 180 ° the three most commonly used, in addition to other 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. The connections to the tube are: direct welding (the most common method) flange connection, hot melt connection, electrofusion connection, screw connection and socket connection. According to the production process can be divided into: welding elbow, stamping elbow, pushing elbow, casting elbow and so on.Carbon steel elbow is a kind of carbon steel pipe fittings.

Varieties classification

Carbon steel elbow is first divided into its radius of curvature, which can be divided into long radius elbows and short radius elbows. The long-radius elbow refers to its radius of curvature equal to 1.5 times the outer diameter of the tube, ie R = 1.5D. A short-radius elbow means that its radius of curvature is equal to the outer diameter of the tube, ie R = 1.0D. (D is the diameter of the elbow, and R is the radius of curvature. D can also be expressed in terms of folds.) If there are 17 levels depending on the pressure rating, the same standards as in the U.S. tube are: Sch5s, Sch10s, Sch10 , Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS, the most commonly used are STD and XS. According to the angle of the elbow, there are 45° elbows, 90° elbows and 180° elbows.

The material classification

Carbon steel can be divided into
10# 20# A3 Q235A 20g Q345B 20G 16Mn ASTM A234 ASTM A105 st37 ASTM A403 etc
The elbows made of these materials as raw materials can be called carbon steel elbows.
90° carbon steel elbow
90° carbon steel elbow
According to the angle: 45°, 90°, 180°, these three commonly used elbows, and other engineering needs, can be specially customized such as 60 ° or other angles.
Connection with carbon steel pipe: welding, flange connection, screw connection, socket connection and other forms.
According to the process form can be divided: welding elbows, stamping elbows, casting elbows and so on.
Uses: Connect two tubes to change the direction of the tube, turning to 45° or 180° and 90° or other angles.
Manufacturing standards: national standard, American standard, Japanese standard, German standard, and Russian standard.
The basic process of a carbon steel elbow is to first weld a multi-prism ring shell with a polygonal cross-section or a polygonal prismatic shell with both ends closed. After the interior is filled with pressure medium, internal pressure is applied and the cross-section under internal pressure is applied. From a polygon to a circle, it eventually becomes a circular shell. According to need, a circular ring shell can be cut into 4 90° elbows or 6 60° elbows or other size elbows. The process is suitable for manufacturing any elbow diameter and elbow ID ratio greater than 1.5 times. Specifications Large elbows are an ideal way to make large carbon steel elbows.
The advantages of the carbon steel elbow production process are mainly manifested in the following aspects:
(1) Tube blanks are not needed as raw materials, which can save the cost of the tube equipment and molds, and can obtain carbon steel elbows with any large diameter and relatively thin wall thickness.
(2) The blank is a flat or developable surface, so the material is simple, the accuracy is easy to ensure, and the assembly and welding are convenient.
(3) Due to the above two reasons, the manufacturing cycle can be shortened and the production cost can be greatly reduced. Because it does not require any special equipment, it is especially suitable for on-site processing of large-scale carbon steel elbows.
(4) Carbon steel elbows are suitable for the pipeline series of petroleum, natural gas, chemical, hydropower, construction and boiler industries.

The process flow

Someone want to know what is hot bends.well ,we will introduce that next time.