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CUI is a form of corrosion caused by the presence of water vapor in pipeline insulation materials. Corrosion under insulation (CUI) is difficult to observe, since the corrosion occurs between the surface of the pipe and the insulating material placed on the outer surface of the pipe. This research has purpose to know the influence of variation of fluid temperature in and variation of coating type to corrosion characteristics of outer part of steel pipe ASTM A53 Grade B with insulation material of silica aerogel and alumunium foil. Pipes to be tested at internal fluid temperature of 50oC, 60oC and 70oC with variations of epoxy, alkyd, PTFE and polyurethane coatings. With outside environmental conditions using 150ppm NaCl content. The circuit will be tested for 14 days with the immerse method. To analyze the corrosion characteristics that occur are used OM, SEM, XRD, and Weight Loss test. OM test results show that as the coating temperature rise will be damaged. While the SEM results showed that the type of corrosion that arises is uniform corrosion. For weight loss test showed that with increasing temperature the corrosion rate is increasing with coating efficiency of highest to low coating is epoxy, PTFE, PU and alkyd.. While XRD test results show that corrosion product is FeS , FeCl2 dan Fe2O3.