摘要
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。
Austenitic heat resisting stainless steels were alloyed by optimizing chemical composition and adding small amount of rare earths,N and Si. The effect of these elements on the typical grade Therma 253 MA was studied by means of high temperature tensile and oxidation tests. The results show that the strength at ambient temperature and the creep strength are increased largely and oxidation resistance in dry air is improved. These properties of Therma 253 MA are superior to those of commonly used austenitic heat resisting stainless steels 310 S and309S. In many cases,Therma 253 MA steel can replace 310 S and 309 S,providing prolonged life time of equipment and reducing amount of material used with a obvious benefit for the future.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第1期126-129,共4页
Heat Treatment of Metals
关键词
不锈钢
蠕变强度
抗氧化性
稀土元素
stainless steel
creep strength
oxidation resistance
rare earth elements
