... , rectangular pipes, welded pipes, mirror-polish pipes, and special pipes Stainless Steel Pipe1) Types: seamless pipes, square pipes, rectangular pipes, welded pipes ... 4) WT: 1 to 40mm 5) Grades: 321, 304, 304L, 316, 316L, 310S, etc.6) Standards: GB, ASTM, JIS, DIN 7 ... ; space, War Industry, Hardware, Boilers, Heat Exchangers, Ships And Electricity stainless steel Pipe