XS Stainless Seamless Elbow Pipe Fittings:GB, API, DIN, JBS, GOST

The elbow is a pipe fititng for bends in the pipeline . It represents the largest proportion, about 80% among all the pipe fittings used in the pipeline system. Usually, select different forming process for the elbows with different materials or wall thickness. At present,forming processes for seamless elbows commonly used by manufacturing plants are stamping,thrust,extrusion etc.. 

Classifications of Elbows:

1 .Classified as materials: carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, PVC, PPR etc..
2. Classified as making process:pushing, pressing, forging, casting etc..
3.Classified as manufacturing standards: GB, API, DIN, JBS, GOST, etc..
4.Classified as according to its radius of curvature: ELL and ELS. Long radius elbow refers that its radius of curvature is equal to 1.5 times the outer diameter of a pipe ( R=1.5D). Short radius elbow means that its radius of curvature is equal to the external diameter of a pipe (R=1.0D).
5.Classified by pressure rankings: There are about 17, and is the same with American Standard pipes : Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS, in which the most common is STD and XS.
6.Classified by the different shapes and uses: grooved elbows, sleeve elbows, coupling elbows,flanged elbows,reducer elbows, stamping elbows,pushing elbows,socket elbows,butt weld elbows,inner screw elbows etc..