ON THE MEASUREMENT OF THE TEMPERATURE OF MOLTEN STEEL IN USING W-C THERMO-COUPLE.

Abstract

In the steel making practice, it is very important to know the temperature of molten steel.
Generally the optical pyrometer is used, but the temperature measured is not accurate as the personal error is apt to become large, and also as the oxidized film or gases issued covers the surface of the molten metal.
To gain more accuracy, the author studied the contact pyrometer in using W-C thermo-couple.
With the special devises, he found that this thermo-couple is applicable in practice, especially in the case of the casting temperature measurement.
By this method the personal error occurs rarely, and also the error of the temperature measured becomes very small in comparison with the optical method as we can dip the tip of the thermocouple in the steel bath itself.
The value of E.M.F. obtained from this thermo-couple is in the same order as in the case of Pt-PtRd couple, and so we can use the ordinary millivolt-meter to measure the temperature.