Material: AF21,TP2,1Cr18Ni9Ti,T2,Fe Size: Inner diameter 28-108, NO. of fins:16-32 medium ... gas 2. wat/oil 3.water/vap Our new inner finned tube has 7 times more heat transfer area ... low viscosity.Material: AF21,TP2,1Cr18Ni9Ti,T2,Fe Size: Inner diameterΦ28~Φ108, number of fins: 16~32 Applicable ... . water/oil 3.water/vapor 4 oil/gas ModelTube inner dia.(mm)Number of fin tooth (J)corrugated-tooththickness ...