中国电力2017，Vol.50Issue(8)：82-86,128,6.DOI:10.11930/j.issn.1004-9649.2017.08.082.05
低硬度P91管件的安全性评价及寿命预测
Safety Evaluation and Lifespan Prediction of Low Hardness P91 Pipes
杨超 1汤淳坡 2龚宏强 3孙雄1
作者信息
- 1. 江苏方天电力技术有限公司,江苏南京 211102
- 2. 国电泰州发电有限公司,江苏泰州 221142
- 3. 江苏国信扬州发电有限责任公司,江苏扬州 225131
- 折叠
摘要
Abstract
In order to ensure the safety of the piping and equipment used in the thermal system,the creep rupture test is carried out at 570 ℃ on the P91 specimens with different hardness.The test results are fitted by the logarithmic functionfor safety evaluation and lifespan prediction of the P91 pipe,such that the overestimation on long-term creep rupture caused by isothermal extrapolation method can be avoided.The study results show that for low hardness P91 pipe fittings,the creep rupture of 570 ℃/1× 105 h tends to drop with the decrease of hardness.Especially when the hardness goes down below 165 HBW,the creep rupture strength of P91 steel will decrease below the material allowable stress,which means its long-term safe operation cannot be ensured.The P91 pipes in operation with low parameter settings have a larger strength margin,and its hardness is allowed to be lower to some extents.However,for the main steam pipeline operated at 570 ℃,especially without thickening designed bend,the strength margin is very low.Therefore,the safety evaluation and lifespan prediction is compulsory.关键词
火力发电/热力系统/低硬度P91管件/对数函数外推/组织稳定性/安全性评价/寿命预测Key words
thermal power/thermal system/low hardness P91 pipe fittings/extrapolation of logarithmic function/tissue stability/safety evaluation/lifespan prediction分类
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杨超,汤淳坡,龚宏强,孙雄..低硬度P91管件的安全性评价及寿命预测[J].中国电力,2017,50(8):82-86,128,6.
