sorry but your information its not enough. you are in front of an unsteady heat transfer problem and for solve you need additional information. for example size, material and content of the container. You also need the air velocity inside the chamber and determine the external heat transfer coefficient at this so low temperature.
The outside diameter is 43mm and inside diameter is 41.5mm.the length of the material is 80mm.the type of material is SS304. Air velocity is 0.40 m/s(approximately).