Abstract
This report treated of the results of studying the formula of calculating the scaling loss of rolled carbon steel based on the oxidation degree, on the correlation among shapes, size and the scaling loss of rolled steel and on the scale-off depth of steel surface due to oxidation at high temperature in the case of several degrees of heating temperature and heating rate.
A formula was set up, by which the scaling loss could be calculated by applying an empirical formula showing the relation between temperature and oxidation degree mentioned in the previous report. The relation between the scaling loss and the shape and size of heated steel could be expressed in a simple formula.
The formula of y=A.tB, B<0 was set up by which the approximate value of oxidation degree (y, g/cm2) could be calculated by applying it to several degrees of heating temperature and heating rate (t, °C/min), if the temperature of extracting ingots and the time of keeping it in the furnace were known. The formula D=1/(f-1)×y/7.8 was obtained, by which the scale-off depth (D, cm) due to oxidation at high temperature in the furnace could be calculated, and the correlation between the oxidation degree, the heating temperature, the heating rate and the scale-off depth was made clear. Then some consideration was given to the relation between. the scaling and defects in rolled products.
