... medium pressure boiler ,high pressure boil thick wall seamless steel pipe1) Standard:API 5L,ASTM 36.10M, ... , STD, XS, XXS etc.6) Technique:Hot Rolled,Cold Drawn,Seamless,ERW,LSAW,SSAW,7) Surface treatment:bare,black ... painting,anti rust oil,hot dipped galvanized,3pe, ... ,boiler,construction,,metallurgy,etc thick wall seamless steel pipe