Generally, stainless steel tubes are categorized into round, square, and rectangular shapes.
Stainless steel Welded Tubes are available in grades SS201, 304, 316L, 409 (A554, A249, A269, A270). Basically, the specifications are as below
round tubes: 8-325mm,
square tubes: 10 × 10-200 × 200mm,
rectangular tubes: 20 × 10-200 × 100mm,
above with thicknesses of 0.9~10mm.