... alloy steel,Aluminum steel Description of Cap:Production NameASTM A234 WPB Carbon Steel Cap,pipe fitting large diameter ,ansi b16 ... 1/4''-48''),DN8-DN1200WTSCH5S-XXSStandardANSI B16.9, ANSI B16.28, DIN 2605, ISO3419,DIN EN10253,JIS B2312, JIS B2313 ... according to customer's requirementMain pipefittingsElbow ,Tee/Cross ,Reducer ,Cap ,Flange ,Bend,Stubtube,Weldolet/Threadolet/Olet,Nipple,Reducing Socket ...