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<p>The close relationship existing between the heat treatment and the magnetic properties of iron and steel, as well as between their heat treatment and mechanical properties is becoming recognised as very important. Changes in the physical properties resulting from thermal treatment generally indicate certain transformations and changes in structure, and have been studied in the case of 1% carbon steel, as a result of which it has been shown that a very rapid rise of the maximum and residual induction and an even more pronounced decrease in the coercive force occur between the drawing temperatures of 150° and 250°C. Such changes probably mark the transformation from martensite to troostite. In the present investigation, a eutectoid steel c
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