Classification and manufacturing process of carbon steel elb

Carbon steel elbows made of carbon steel can be divided into the following types:

10 # 20 # A3 Q235A 20g Q345B 20G 16Mn ASTM A234 ASTM A105 st37 ASTM A403, etc

Bends made from these materials can be called carbon steel elbows

90 ° carbon steel elbow

Divided by angle: these three commonly used elbows are 45 °, 90 °, and 180 °. There are also engineering needs that can be specially customized, such as 60 ° or other angles.

The connection methods with carbon steel pipes include welding, flange connection, threaded connection, socket connection, etc.

According to the process form, it can be divided into welded elbows, stamped elbows, cast elbows, etc.

Usage: Connect two pipes to change direction, turn towards 45 ° or 180 ° and 90 ° or other angles.

Manufacturing standards: national standard, American standard, Japanese standard, German standard, Russian standard.

The basic process of carbon steel elbow is to weld a polygonal multi edged ring shell or a multi edged fan-shaped shell with closed ends. After filling the interior with pressure medium, internal pressure is applied, and under the action of internal pressure, the cross-section gradually changes from polygonal to circular, becoming a circular ring shell. According to the needs, a circular ring shell can be cut into 4 90 ° elbows or 6 60 ° elbows or other specifications of elbows. This process is suitable for manufacturing large elbows of any specification with a pitch diameter to inner diameter ratio greater than 1.5 times, and is an ideal method for manufacturing large carbon steel elbows.

The advantages of this carbon steel elbow manufacturing process are mainly reflected in the following aspects:

(1) No need for pipe blank as raw material, which can save on pipe making equipment and mold costs, and can obtain carbon steel elbows with any large diameter and relatively thin wall thickness.

(2) The billet is a flat or developable surface, making it easy to cut, ensure accuracy, and facilitate assembly and welding.

(3) Due to the above two reasons, the manufacturing cycle can be shortened and production costs can be greatly reduced. Because no equipment is required, it is particularly suitable for on-site processing of large carbon steel elbows.

(4) Carbon steel elbows are suitable for pipeline series in industries such as petroleum, natural gas, chemical, hydropower, construction, and boilers.