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对奥氏体耐热不锈钢进行合理合金化,在化学成分方面进行了优化,加入了微量的稀土元素,适量的氮和硅元素。以典型钢种Therma 253MA为例,通过高温力学性能和氧化试验,对这些元素的作用进行了研究。结果表明,合金化后Therma 253MA的室温强度和高温蠕变强度都有较大的提高,干燥空气中的抗氧化性能也大大改善,性能均优越于目前常用奥氏体耐热不锈钢309S和310S等钢种。在许多情况下,Therma 253MA可以完全取代310S和309S,延长设备的使用寿命、减少材料用量,经济效益明显。
The austenitic heat-resistant stainless steels are reasonably alloyed and optimized in terms of chemical composition by adding a trace amount of rare earth elements, appropriate amounts of nitrogen and silicon. Taking the typical steel type Therma 253MA as an example, the effect of these elements was studied through high temperature mechanical properties and oxidation tests. The results show that both the room temperature strength and high temperature creep strength of Therma 253MA are greatly improved after alloying, the oxidation resistance in dry air is also greatly improved, the performance is superior to the commonly used austenitic heat-resistant stainless steel 309S and 310S, etc. Steel species. In many cases, Therma 253MA can completely replace the 310S and 309S, extend the service life of the equipment, reduce the amount of material, the obvious economic benefits.