Abstract: The precipitated phases in Ф47 mm x 8 mm cold rolled tube of heat resistant steel TP310HCbN (/% : 0. 07C, 0. 39Si, 1. 20Mn, 25. 05Cr, 20.40Ni, 0.42Nb, 0.266N) solid-solution-treated at 1 120 ~ 1 160 °C then rupture test at 700 °C for 0 ~19 570 h are analyzed by the test method including SEM, TEM, energy spectrum analysis and hardness test. Results show that as the heat resistant steel TP310HCbN rupture test with 95 ~220 MPa at 700 °C for 0 ~ 1 000 h, with increasing test time, the hardness HV value increases from 237 to 255 , as that for more than 1 000 h, the hardness value is no change； with increasing test time, the intragranular precipitates in steel change from granular type to rod type, and there is a lot of wormlike NbCrN precipitates which interacts with dislocation ； the extrapolated rupture strength of produced test heat resistant steel TP310HCbN at 700 ℃ for 100 000 h is 63. 65 MPa to meet the requirement of standard.

摘要： 通过扫描电镜、透射电镜、能谱分析和硬度试验等方法分析了TP310HCbN耐热钢（/%:0.07C，0.39Si，1.20Mn，25.05Cr，20.40Ni，0.42Nb，0.266N）Ф47mm×8 mm冷轧管经1120~1160℃固溶处理后在700℃ 0~19 570 h持久试验时的析出相。结果表明,TP310HCbN耐热钢700℃95~220 MPa持久试验时间在0~1000 h时,随时间增加,硬度HV值由237增至255,当持久时间超过1 000 h,硬度趋于平稳;随着持久时间增加,该钢晶内析出物由颗粒状转变为棒状,并存在大量与位错相互作用的蠕虫状NbCrN析出物;生产的TP310HCbN耐热钢700℃-100 000外推持久强度为63.65 MPa满足标准要求。

关键词: TP310HCbN耐热钢, Ф47 mmx8 mm管, 析出相, 持久强度