... .stainless steel welded square tubeS for stair rail,safety window, guard door etc 2. Material: 201, 304, 316, 430, etc Features of welded stainless steel square ... sizes are availableSurface available: MF, 180grit, 240grit, 320grit and 400gritGrade: 201, 202, 304, 316, 316L, 321, 409, 430Standard: GB/T12770; ... , and especially suitable for bending and further fabrication. Stainless Steel Square Tube