... 1) Materials: 304, 321, 316L, 304L, 316, and so on 2) Tube path: 6mm-31.8mm raw material from POSCOstainless steel ... tube for heat exchanger Specifications:1) Diameters: 4 - 76. ... in the foodstuff,medical equipment,power,boiler,cooler,auto,condenser etc.6)packing: inner packing:1 pc/plastic bag ... in weaving bags or in plywooden case. U-tube for condenser