ASTM Seamless carbon Steel Elbow-45deg LR Elbow,Tee,Reducer,Lap joint,Caps Size:1 ... 48" Acc.to GB/T12459/ASME Seamless carbon Steel Elbow-45deg Name:Butt Welded Seamless Steel MaterialCarbon steel :A234-WPB. ... .A403-WP316L etc.Bending Radius (R)R=1D.1.5D.3D.5DBending Angle15° 30° 45° 60° 90° 135° 180°, also ... :carbon steel2. Bending Radius (R): R=1D 1.5D 3D 4D 5D 6D 7D 8D 9D 10D3. Bending Angle:15o ...