... STDStandardANSI,ASME,JIS,DIN,GB,BS,APIMaterial Carbon steel,Stainless steel,Alloy steelCarbon steel ASTM A234 WPB,WPC;ASTM A420WPL9,WPL3, ... steel ASTM A234 WP11,WP12,WP22,WP1,WP5,WP9Application rangepetroleum,chemical industry,medical,papermaking,etcSurface Treatmentpolishing treatment ,rust-proof black ... NAME&HIC Fittings Erw--round,Square,Rectangular Section--steel Pipe--black Colored,Galvanized