The oxidation test of concasting slab specimen of steel SPAH (% : 0. 05C

0. 25Cu

0. 12Ni

0. 41 Cr) at 900 ~ 1 250 ℃ for 20 min was carried out by using box electric resistance furnace in laboratory

and the structure and chemical composition of oxidation layer of specimen were obsen ed and analyzed by scanning electron microscope ( SEM) and energy dispersive spectrometer ( EDS). Results show that with increasing heating temperature

the oxidizing rate of steel dramatically increases while the amount of Cu enriched phase in oxidation layer increases； as heating at ≤ 1 000 ℃

the oxidation of grain boundary is dominant

and as heating at temperature more than 1 000 °C

the oxidation of grain interior is dominant. Therefore during heating concasting slab of steel SPAH for container plate

the heating time at high temperature region should be decreased to lower the oxidation loss.