Stainless steel welded tubes include ASTM A554, ASTM A269, ASTM A249, ASTM A270.Steel grade: 200 series, 300 series, 400 series. Detailed product description ... , ASTM A269, ASTM A249, ASTM A270. 1. Form: Round, square, rectangular, oval, channel U, etc. 2. Finish: 180#, 320#, hairline, satin ... × 100mm for square tube; 10mm× 20mm to 60mm× 120mm for rectangular tube. 4. Wall thickness: 0.5mm to 5.0mm. 5 ...