Carbon steel elbow

Definition and purpose

Definition: Carbon steel elbow is a metal fitting used to change the direction of carbon steel pipeline.

Usage: Widely used in basic engineering such as chemical, construction, water supply, drainage, petroleum, light and heavy industries, refrigeration, sanitation, plumbing, fire protection, electricity, aerospace, shipbuilding, etc., used to connect two pipes and change their direction.

classification

According to the curvature radius, the curvature radius of a long radius elbow is equal to 1.5 times the outer diameter of the pipe, that is, R=1.5D; The curvature radius of a short radius elbow is equal to the outer diameter of the pipe, i.e. R=1.0D.

Classified by pressure level: There are about seventeen types, similar to the American pipe standard, including sch5s、sch10s、sch10、sch20、sch30、sch40s、std、sch40、sch60、sch80s、xs、sch80、sch100、sch120、sch140、sch160、xxs  Wait.

Divided by angle: commonly used are 45 °, 90 °, 180 ° elbows, and other angles of elbows can also be customized according to project needs.

According to the connection method, it can be divided into welded elbows, threaded elbows, and flange elbows.

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

manufacturing process

Hot pushing forming: Using a dedicated elbow pushing machine, core mold, and heating device, the billet placed on the mold is pushed forward by the pushing machine, heated, expanded, and bent into shape during the movement. This process is suitable for manufacturing carbon steel elbows with large diameters and thin wall thicknesses.

Stamping forming: The earliest forming process applied to mass production. In the production of commonly used specifications of elbows, it has gradually been replaced by hot pressing or other forming processes. However, for certain specifications of elbows, stamping forming is still used due to small production quantities and excessive wall thickness or thinness. This process is suitable for single piece production and low-cost manufacturing of small batch, thick walled elbows.

Mid plate welding: The mid plate is made into half of the elbow section by a press machine, and then the two sections are welded together. It is usually used to make elbows with a diameter of DN700 or more.

Materials and Execution Standards

Materials: including 10 #, 20 # A3、Q23优良、20g、Q345B、20G、16Mn、ASTM A234、ASTM A105、st37、ASTM A403  Wait.

Execution standards: There are national standards such as GB/T12459-2005, GB/T13401-2005, GB/T10752-1995, HG/T21635-1987, D-GD0219, as well as international standards such as ASME B16.9, ASTM A234/A234M-19, DIN 2605, EN 10253, etc.