Abstract: The oxidation resistance of a new high silicon austenite heat resistant stainless steel TD305B (/% : 0. 05C, 3. 30Si, 0. 80Mn, 19. 50Cr, 13. 30Ni, 0. 05N) and a traditional heat resistant stainless steel SUS310S (/% : 0. 05C, 0. 60Si, 0. 80Mn, 24. 60Cr, 19. lONi, 0. 05N) at 500 〜1 000 ℃ air atmosphere has been studied by weight gain method, and an analysis on morphology of surface oxide film of sample is carried out by scanning electron microscope and energy dispersive X-ray spectrometer (EDS). It is found that at 700 〜1 000℃ the oxidation resistance of the new high silicon heat resistant steel TD305B is better than that of the traditional heat resistant austenite steel SUS310S, besides at elevated temperature the matrix of steel easily reacts with oxygen to form a protective oxide film including FeO • Cr₂O₃ and FeCr₂O₄- NiCr₂O₄ , because the new steel TD3O5B has a definite amount silicon, a layer of SiO₂ is formed at distance of 20 μm from surface to inhibit further oxidation, as a result the steel TD3O5 B has a better oxidation resistance at elevated temperature.

Key words: High Silicon Heat Resistant Stainless Steel TD305B, Elevated Temperature, Oxidation Resistance

摘要： 采用增重法研究了高硅奥氏体耐热不锈钢TD305B(/%:0.05C、3.30Si、0.80Mn、19.50Cr、13.30Ni、0.05N)和传统耐热不锈钢SUS310S(/%:0.05C、0.60Si、0.80Mn、24.60Cr、19.10Ni、0.05N)在500～1 000℃空气中氧化性能,通过扫描电镜及能谱分析(EDS)对试样表面氧化膜的形貌进行了分析。结果发现,在700～1 000℃新型高硅耐热不锈钢TD305B较传统耐热不锈钢SUS310S抗氧化性好,主要是由于TD305B钢除了在高温时基体与氧容易形成FeO·Cr₂O₃和FeCr₂O₄、NiCr₂O₄等保护性氧化膜外,还由于含有一定量的硅,在距表面20μm处形成了一层SiO₂阻止了氧化的进一步加剧,使得TD305B钢具有良好的耐高温氧化性能。

关键词: 高硅耐热不锈钢TD3O5B, 高温, 抗氧化性