... Standard:ASME,BS,DIN,JIS,GB Materail:Stainless&Carbon Steel duct pipe fittings elbows/ Pipe Elbow Size Seamless elbow:1 ... WP 22-WP 5-WP 91-WP 911 Stanless steel: ASTM/ASME A403 WP 304-304L-304H-304LN- ... 321-321H ASTM/ASME A403 WP 347-347HLow-temperature steel:ASTM/ASME A402 WPL 3-WPL 6High performance: ... elbows are made of carbon steels,alloy steels,stainless steel or PVC,and more They have high strength, ...