How to determine the ductile transition temperature?
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How can one determine the ductile-to-fragile transition temperature of a material?
There is no exact figure. C steel, a low-alloy steel, is generally around -20 degrees.
It’s not easy to determine; you can ask the material manufacturers, as they have the relevant data.
There is far too little basic data on this topic!
It seems to have been determined through experiments; the various ** as well as different grades of steel are all similar
Although there are many methods for determining the brittle transition temperature, and the results obtained from these methods vary considerably, the temperature corresponding to a Charpy V-notch impact energy Akv of 21 J has been accepted by the international engineering community as the brittle transition temperature for low-carbon steel and carbon-manganese steel.