Supply 20G elbow Q345E welded elbow Production (1) welded elbow by its radius of curvature can be divided into long radius elbows and short radius butt weld elbow. Long radius elbow welded equal to 1.5 times the radius of curvature of the pipe diameter, i.e. R = 1.5D. Welded elbow short radius equal to the radius of curvature of the pipe diameter, ie, R = 1D. Where D is the diameter of the welded elbow, R is the radius of curvature. If no special instructions, generally used in the 1.5D elbow. (2) In terms of pressure levels to points, there are about seventeen kinds, and the American standard pipe is the same, there are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80 , Sch100, Sch120, Sch140, Sch160, XXS, which is the most commonly used two kinds of STD and XS. (3) according to the angle of the elbow, 45 degree welded elbow, 90 degree and 180 degree elbow butt welded elbow, and other different angle of the elbow. (4) Materials: carbon steel, alloy steel and stainless steel