P91钢管的长期高温服役组织与性能

doi:10.13251/j.issn.0254-6051.2024.09.007

金属热处理 ›› 2024, Vol. 49 ›› Issue (9): 43-46.DOI: 10.13251/j.issn.0254-6051.2024.09.007

P91钢管的长期高温服役组织与性能

张英伟¹, 白建强¹, 白占桥¹, 李炜丽², 谌康², 董树青²

1.内蒙古大唐国际托克托发电有限责任公司, 内蒙古呼和浩特 010200;
2.中国大唐集团科学技术研究总院有限公司华北电力试验研究院, 北京 100040

收稿日期:2024-03-12 修回日期:2024-07-13 出版日期:2024-09-25 发布日期:2024-10-29
作者简介:张英伟(1988—),男,高级工程师, 主要研究方向为耐热钢、电厂金属监督,E-mail:516446518@qq.com

Microstructure and properties of P91 steel pipe after long term high temperature service

Zhang Yingwei¹, Bai Jianqiang¹, Bai Zhanqiao¹, Li Weili², Shen Kang², Dong Shuqing²

1. Inner Mongolia Datang International Tuoketuo Power Generation Co., Ltd., Hohhot Inner Mongolia 010200, China;
2. Institute of North China Electric Power Test and Research, China Datang Corporation Science and Technology Institute, Beijing 100040, China

Received:2024-03-12 Revised:2024-07-13 Online:2024-09-25 Published:2024-10-29

摘要/Abstract

摘要： P91钢管额定运行温度541 ℃,运行压力17.5 MPa,规格ϕ194 mm×25 mm,服役约7.8万小时后,硬度低于标准下限。采用金相、透射电镜、化学相分析、持久性能等试验方法,对某亚临界锅炉用P91钢管长期服役后的组织和性能开展研究。结果表明:P91钢管长期高温服役后马氏体板条宽化和晶界M₂₃C₆相粗化是导致其高温强度降低的主要原因。通过P91钢管取样持久试验,566 ℃外推10万小时持久强度值为72 MPa,为P91钢剩余寿命评估提供数据参考。

关键词: P91钢管, 长期高温服役, 组织, 性能

Abstract: Rated operating temperature of the P91 steel pipe was 541 ℃, the operating pressure was 17.5 MPa, and the specification was ϕ194 mm×25 mm. After about 78 000 h of service, its hardness was below the lower limit of the standard. Microstructure and properties of the P91 steel pipes used in a subcritical boiler after long-term service was investigated by means of metallographic, transmission electron microscopy, chemical phase analysis, creep-rupture properties and other test methods, respectively. The results show that the widening of martensite laths and the coarsening of the M₂₃C₆ phase at the grain boundaries of the P91 steel pipes after long-term high-temperature service are the main reasons for the decrease in high-temperature strength. Specimens were taken from the P91 steel tubes for endurance testing, resulting in creep rupture strength value of 72 MPa for 100 000 h of extrapolation at 566 ℃. Data can be used as the reference for the assessment of the creep life of the P91 steel.

Key words: P91 steel pipe, long-term high temperature service, microstructure, properties

中图分类号:

TG142.1

张英伟, 白建强, 白占桥, 李炜丽, 谌康, 董树青. P91钢管的长期高温服役组织与性能[J]. 金属热处理, 2024, 49(9): 43-46.

Zhang Yingwei, Bai Jianqiang, Bai Zhanqiao, Li Weili, Shen Kang, Dong Shuqing. Microstructure and properties of P91 steel pipe after long term high temperature service[J]. Heat Treatment of Metals, 2024, 49(9): 43-46.

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P91钢管的长期高温服役组织与性能

Microstructure and properties of P91 steel pipe after long term high temperature service

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