Stainless Steel Tube size: Od6_530mmx wt 0.5--30mm Material: 321, 304, 304l, 316, 316l, 310s, 317, 317l, 305, 347 Stainless steel tube for heat exchanger Specifications: 1) Diameters: 4 - 406mm 2) W. T.: 0.4 - 20mm 3) Grades: 316L/304/304L/310S, etc. 4)standard: GB/ISO/EN/ASTM/JIS, etc. 5)application range: Widely use in the foodstuff, medical equipment, power, boiler, cooler, auto, condenser etc ...