Posted by used red MN on November 27, 2021 at 17:11:13 from (67.44.240.181):
In Reply to: What happens to metal posted by SVcummins on November 27, 2021 at 11:46:38:
When carbon steel is heated to the temperature it can just be seen as a dull red in the dark it starts leeching carbon. I am not sure what chemical effect this has on the steel as far as retaining heat. I do believe the answer is the surface change of the steel from repeated heating referred to as oxidizing. That ..oxidized.. coating heats up and the heat does not dissipate into the full thickness of the steel. So in affect the temp of the steel is not what it seems. Secondly, there is a consideration many do not know about when using an infrared thermometer. The temperature taken by infrared before and after the item is buffed can by influenced a surface condition called emissivity. This is a term used to describe the absorption and reflection of infrared radiation from a surface. In general a shiny surface such as a buffed area can give you an erroneous reading. Although in this case it may not be a huge difference. A shiny chrome surface will generally give a mistakenly high temperature. My day to day work is using infrared to measure temperatures that are mostly between 500 & 2000F
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