... according to requirementsAnti-corrosion and high-temperature resistant with black paintingAll the production process are made under ... ISO:9001-2000 strictly1) Standard:API 5L,ASTM 36.10M,A106,A53,DIN 1629,1626,BS ... Rolled,Cold Drawn,Seamless,ERW,LSAW,SSAW,7) Surface treatment:bare,black painting,anti rust oil,hot ... dipped galvanized,3pe,etc8) Length: 5.8 meters for 20' container, 6 meters ...