SPAH钢集装箱板连铸坯加热氧化特性

Oxidation Characteristics of Concasting Slab of Steel SPAH for Container Plate

通过实验室箱式电阻炉对SPAH钢(%:0.05C、0.25Cu、0.12Ni、0.41 Cr)连铸坯试样进行900～1 250℃,20 min氧化试验,并用扫描电镜和X-射线能谱仪观察和分析了试样氧化层的组织和成分。结果表明,随加热温度增加,钢的氧化速度急剧增加,同时氧化层中的Cu富集相增加;≤1 000℃加热时,晶界氧化占主导,1 000℃以上加热,晶内氧化占主导。因此SPAH钢集装箱板连铸坯加热时,应减少高温段的加热时间,以便减少氧化烧损。

The oxidation test of concasting slab specimen of steel SPAH （ % ： 0. 05C, 0. 25Cu, 0. 12Ni, 0. 41Cr） 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 observed 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 ℃ , 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.