stainless steel Square Pipes 1)advanced technique 2) passed the ISO9001:2000,ISO14001:2004 and CE/PED certification stainless steel Square PipesFeatures:1) Standards: ... high-temperature resistant3) The main standards are 304, 304L, 316, 316L, 321, 321H, 310S, 347H4) Size: OD (6-530) x ... medical equipment, aviation, boiler heat exchanger, and other fields stainless steel pipe,square tube,welded pipe