... Environmental friendly Energy saving;lower cost Corrosion-resist Specifications(evaporator coil)Raw material1) Rolling welded steel pipe: 8 ×0.7mm , with ... )Key processStraightening cutting, bending, welding wire, molding, assembly welding, leakage testing, pre-treatment, electrophoresis, spraying, packing. Technical standardsWire pitch: ≥ 5 , can ...