金属热处理 ›› 2026, Vol. 51 ›› Issue (2): 96-100.DOI: 10.13251/j.issn.0254-6051.2026.02.015

• 组织与性能 • 上一篇    下一篇

P92钢管弯头组织差异原因分析

闫敬明, 张骏, 周宁, 张建伟, 杨占君   

  1. 中国大唐集团科学技术研究总院有限公司西北电力试验研究院 材料研究所, 陕西 西安 710021
  • 收稿日期:2025-09-09 修回日期:2025-12-18 发布日期:2026-03-05
  • 作者简介:闫敬明(1995—),男,助理工程师,硕士,主要研究方向为电厂金属失效分析及寿命评估,E-mail:604187995@qq.com

Causes analysis for microstructure difference of P92 steel pipe elbows

Yan Jingming, Zhang Jun, Zhou Ning, Zhang Jianwei, Yang Zhanjun   

  1. Institute of Materials Research, Northwest Electric Power Test Research Institute of China Datang Corporation Science and Technology Research Institute Co., Ltd., Xi'an Shaanxi 710021, China
  • Received:2025-09-09 Revised:2025-12-18 Published:2026-03-05

摘要: 针对某基建现场两种不同组织(“细晶”马氏体与“粗晶”马氏体)的P92钢管弯头,为查明“细晶”马氏体组织出现的原因,对其热处理工艺进行了试验模拟,并对两种弯头的高温持久强度进行了对比。结果表明,正火温度是影响P92钢管马氏体组织粗细的决定性因素。热处理模拟发现,P92钢管弯头热加工成形后,恢复热处理时因正火温度低于标准规定值,导致出现“细晶”马氏体组织,且“细晶”马氏体组织的P92钢管弯头的高温持久强度低于“粗晶”马氏体组织。

关键词: P92钢管, 弯头, 显微组织, 热处理, 高温持久强度

Abstract: For two different microstructures ("fine-grained" martensite and "coarse-grained" martensite) of P92 steel pipe elbows at a infrastructure construction site, in order to find out the cause of "fine-grained" martensite microstructure, the heat treatment process was simulated and the high temperature creep rupture strength of the two elbows was compared. The results show that normalizing temperature is the decisive factor affecting the martensite grain size of P92 steel pipe. The heat treatment simulation finds that after hot working and forming of the P92 steel pipe elbow, the normalizing temperature is far lower than the standard specified value during the recovery heat treatment, resulting in the appearance of "fine-grained" martensite microstructure. Moreover, the high temperature creep rupture strength of the P92 steel pipe elbow with "fine-grained" martensite microstructure is lower than that of the "coarse-grained" martensite microstructure.

Key words: P92 steel pipe, elbow, microstructure, heat treatment, high temperature creep rupture strength

中图分类号: