... Stainless Steel Sqaure Tube 1)Grade: 304, 304L, 316, 316L, 321 2)Standards: GB, AISI/ASTM, JIS, BS, DIN, ISOT Seamless Stainless Steel ... reduce the overall cost8) Certificate: ISO, TSG, OIISAS9) The stianless steel pipe 304 is applicable to fluid transport and high pressure ... ) Special pipes according to customers' needs are avalible. seamless stainless steel square tube