Today our video is about one of the Iron-Nickel alloys that exhibit  low thermal expansion characteristics as compared to many other metal alloys. For more info make sure to check the link below for the transcript: https://www.michlinmetals.com/invar-36-nickel-alloy-36-invar-36-supplier/ Most commonly known as Invar 36  when produced by Carpenter technology, its UNS designation is K93601.  Free cutting Invar 36  has UNS designations K93050. The rate  of thermal expansion is roughly one tenth that of carbon steels at temperatures up to 400 deg. F  Metals typically expand with rising temperature  and conversely shrink with decreasing temperatures.  The rate at which this occurs is called the Coefficient of Thermal Expansion or  "CTE". It  typically varies with temperature in a non-linear manner.  To make things easier to use; Metallurgists give us the Mean CTE for a specific range of temperature. With this information we can either compare materials or we can calculate the change in dimension that would occur with a specific change of temperature.