A sensor of martensite start temperature for preventing quenching cracks

摘要

The present invention relates to an MS point (Martensitic transformation start temperature) detection device for the prevention of quenching cracks generated during quenching heat treatment of high carbon steel, more specifically, when the material is introduced into a coolant such as water or oil, By measuring the temperature of the coolant near the input material using the temperature sensing rod, the measured value is displayed on the temperature display window provided in the control box, and the alarm bell rings when the measured value is below the MS point. In addition, the present invention relates to an MS point detecting device for preventing quenching cracks, which enables the quenching material to be taken out from the cooling tank at an appropriate time to prevent quenching cracks generated during the quenching heat treatment.;According to the present invention, there is a control box equipped with a temperature display window, a temperature setting port and an alarm bell, and one end of which is connected by the control box and a cable, and the other end is introduced into a coolant to measure a temperature at a desired point. It is configured, the MS point detection device for preventing quenching cracks is characterized in that the alarm bell sounds an alarm when the temperature measured from the temperature sensing rod matches the set value.