api 5lb seamless steel pipe 1.material:Astm a 53/106/ API 5LA/B,ST37, ... 5L GRB/ API 5 CT /Q345/A335/ST37/ST52Packagingpainting black, pipe cap, steel strips bundled.Applications range petroleum, construction ,shipbuilding,smelting, aviation ... process are made under the ISO9001:2000 strictly.Kewords:seamless pipe,carbon steel pipe,butt welded pipe api 5lb seamless steel pipe