Steel tube:We have our own refining steel factory, we can provide grade 304, 304L, 316L, 321, ... is an experienced company specializing in manufacturing and exporting Seamless stainless steel pipes and tubes. We could offer: TYPEaustenite and austenite-ferritic ... stainless steel pipes & tubesGRADES304/304L, 316/316L, 321, 310S, 317,347, ...