Softening mechanism and heat treatment process control of P91 steel used for steam pipe

CAI Wenhe; ZHAO Weidong; WANG Zhichun; LI Weili; LIU Jianping North China Electric Power Research Institute Co.

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Softening mechanism and heat treatment process control of P91 steel used for steam pipe

更新时间：2025-09-28

- Softening mechanism and heat treatment process control of P91 steel used for steam pipe
- Thermal Power Generation Vol. 42, Issue 1, Pages: 23-25(2013)
- 作者机构：
  
  华北电力科学研究院有限责任公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG162
- Published：2013
- 稿件说明：
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CAI Wenhe, ZHAO Weidong, WANG Zhichun, et al. Softening mechanism and heat treatment process control of P91 steel used for steam pipe[J]. Thermal power generation, 2013, 42(1): 23-25.
DOI：

CAI Wenhe, ZHAO Weidong, WANG Zhichun, et al. Softening mechanism and heat treatment process control of P91 steel used for steam pipe[J]. Thermal power generation, 2013, 42(1): 23-25. DOI：

摘要

对焊后回火导致的低硬度P91钢弯管材料软化的原因进行分析

测试其微观组织和力学性能

分析P91钢的软化机理。结果表明

软化后P91材料的拉伸强度和持久强度明显降低;P91钢管的加工工艺、过高的回火温度、过长的回火时间会促进马氏体再结晶导致铁素体的产生

这是引起P91钢软化的重要原因。对此

提出了控制热处理工艺的相关措施

如准确控制热处理炉的温度、回火恒温时间、升、降温速度等。

Abstract

Reason analysis on bend pipe(made of low hardness P91 steel) softening caused by tempering after welding was conducted.To analyze the softening mechanism

the microstructure and mechanical properties of P91 steel were tested.The results showed that

tensile strength and duration strength of the softened P91 steel decreased significantly.Processing technology of P91 steel pipe

over high tempering temperature and too long tempering time can enhance the recrystallization of martensite

during which a certain amount of ferrite appears

which was one of important causes for the softening.Therefore

relevant measures about process control for heat treatment were developed

for example

exactly controlling the furnace temperature

constant temperature time of tempering

heating/cooling rate and so on.

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Related Author

ZHANG Hongjun1 1.Xi'an Thermal Power Research Institute Co.Ltd.

TANG Liying1

ZHOU Rongcan1

HOU Shufang1

NIE Ming2

YU Zaisong1

HE Xipeng

MA Hong

Related Institution

Guangdong Power Grid Corporation Electric Power Science Research Institute

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Nanjing University of Technology

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