基于传统高Cr铁素体耐热钢系的合金成分,对合金元素进行了一定范围内的调整,设计出一种新型高Cr铁素体系耐热钢。该钢的回火组织主要为大量板条马氏体＋少量铁素体组成。在差分膨胀仪上测定了不同冷却速度新钢的热膨胀曲线,进而制定该钢种的连续冷却转变（CCT）曲线。结果表明,随着冷却速度升高,相变点降低,马氏体板条宽度变小,铁素体由连续长条状向多边形结构和短条状转变,硬度值升高。
A new high Cr ferritic heat-resistant steel was developed based on traditional T91 ferritic heat-resistant steel by adjusting its elements and contents.Microstructure of the tempered steel mainly consists of lath martensite and ferrite.Continuous cooling transformation（CCT） curves of the ferritic heat-resistant steel were obtained by dilatometric test on a differential dilatometer.The results show that the critical transformation temperature decreases with the increase of cooling rate.As the cooling rate increases,the strip ferrite changes to polygon and short rod ones,the size of the martensitic lath decreases gradually,and hardness of the steel increases.
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