The Medium plate of heat resisting steel253MA(0.05~0. 10C
20.0~22.0Cr
10.0~12.0Ni
0.14~ 0.20N
0.03~0.08Ce)was produced by arc funace-A0D refining oxidizing period blowing Nz-ladle feeding rare earth (RE)element Ce Wire-concasting-hot roling plate flow sheet at Taiyuan Steel. Results showed that with feeding Ce wire treatment the RE inclusions were spheroidal and dispersed at inside of austenite grain to increase transverse impact tough- ness and stress-rupture strength. The average oxidation rate of plate of steel 253MA at 1000 ℃ was 0.09 mm/a.