... for stair rail,safety window, guard door etc. 2. Material: 201, 202, 304, 316, 430 Stainless steel square tube, box section, hollow ... T12770; ASTM A554; JIS G3446; DIN EN10296-2Application: Mainly applied for machinery, medical fitness equipment, electroplating, dyeing, trains, cars, bicycles, ... .Advantage: Quite smooth welding line, and especially suitable for bending and further fabrication.