... ,intercooler,evaporator,warm wind movement,air conditioner pipeline,car radiator,refrigerator,cooler,heat exchanger and so on .Following is our details ... .Tolerance :+/-0.03mm4.Strandard:GB/T4437-1-20005.Putting N2 gas inside tube 24hours to keep pressure and test leaks.6 ... , heat treatment can not be strengthened andnot be cut; can gas welding, welding and exposure to hydrogen atoms welding,brazing can ...