... )Standard: DIN, SMS, GB, ASME, etc 3)Material: A105, A182, 304, 316L, etc 1. Technics: Seamless Elbow, Welded Elbow 2. Certificate ... : ASTM A105, A182, A234, A269, A321, A350, A403, A420, 321, 304, 304L, 316, 316L, WPS, WPB, ST37, ST54. 4. Standard:ASME ...