Elbow is a common connection pipe installation fittings, connect two nominal diameter is the same or different pipe, the pipeline for a certain angle turn., The elbow is to change the direction of the pipe fittings in the piping system. All fittings used in piping systems, the largest proportion of approximately 80%. Typically, the selection of different materials or thickness of the elbow different molding processes. present, the common seamless elbow forming process heat pushed , stamping, extrusion, etc. according to the production process can be divided into: welding elbow, stamping elbow, push the system elbow, cast elbow. divided manufacturing standards can be divided into standard water standard, American standard, German standard, Japanese standard, the Russian standard German Standard bend our elbow, elbow of the Japanese standard, American standard elbow the elbow commonly used materials are cast iron, stainless steel, alloy steel, cast iron, carbon steel, non-ferrous metals, can be calcined and plastic tube links: soldered directly (the most common way), flange connection, hot melt connection, fused connection, threaded coupling and socket coupling size seamless size: 1/2 "to 24 "DN15 ~ DN600 butt size: 4" ~ 78 "DN150 ~ DN1900 wall thickness sch10 sch20, sch30, std, sch40, sch60, xs, sch80, sch100, sch120, sch140, sch160, xxs, sch5s, sch20s, sch40s , sch80s maximum wall thickness: 150mm Material Carbon steel: ASTM / ASME A234 WPB, WPC alloys: ASTM / ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP 911 stainless steel: ASTM / ASME A403 WP 304-304L-304H-304LN-304N ASTM / ASME A403 WP 316-316L-316H-316LN-316N-316Ti ASTM / ASME A403 WP 321-321H ASTM / ASME A403 WP 347-347H low temperature steel: ASTM / ASME A402 WPL 3-WPL 6 high-performance steel: ASTM / ASME A860 WPHY 42-46-52-60-65-70 Elbows main parameters of production range outside diameter of 1/2 "to 24" 4 "to 78" wall thickness 2mm to 150mm bending radius R = 1D ~ 10D products angle of 0 ° ~ 180 °