T23和T91高温过热器短时超温爆管的组织性能分析

史志刚; 马红; 崔雄华; 王飞; 王碧磊

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T23和T91高温过热器短时超温爆管的组织性能分析

热力发电 2014年43卷第9期页码：129-132

现场经验交流 | 更新时间：2025-09-28

- T23和T91高温过热器短时超温爆管的组织性能分析
- Mechanical properties and microstructure transformation of T23 and T91 superheater tubes failed by short-term overheating
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  中图分类号： TK223.32
- 纸质出版：2014
- 稿件说明：
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史志刚, 马红, 崔雄华, 等. T23和T91高温过热器短时超温爆管的组织性能分析[J]. 热力发电, 2014,43(9):129-132.

SHI Zhigang, MA Hong, CUI Xionghua, et al. Mechanical properties and microstructure transformation of T23 and T91 superheater tubes failed by short-term overheating[J]. Thermal Power Generation, 2014, 43(9): 129-132.
史志刚, 马红, 崔雄华, 等. T23和T91高温过热器短时超温爆管的组织性能分析[J]. 热力发电, 2014,43(9):129-132. DOI：

SHI Zhigang, MA Hong, CUI Xionghua, et al. Mechanical properties and microstructure transformation of T23 and T91 superheater tubes failed by short-term overheating[J]. Thermal Power Generation, 2014, 43(9): 129-132. DOI：

摘要

某亚临界700MW机组锅炉T23和T91高温过热器服役近105 h时

发生短时超温爆管。为此

对其组织性能进行了试验。发现:T23微观组织明显异常

为铁素体+无位向碳化物

抗拉强度和硬度略有升高

而规定塑性延伸强度(Rp)却显著降低;T91微观组织略有变化

为细碎马氏体+微量碳化物

抗拉强度和硬度显著升高。研究表明

铁素体耐热钢制高温过热器短时超温爆管后

决定其相变后组织形态的主要因素是其随炉冷却速率

并非爆管后所喷射出的工质冷却速率。

Abstract

Several T23 and T91 steel superheater tubes in a subcritical pressure 700 MW unit boiler had failed for short-term overheating after serving for 105 h.The mechanical properties and microstructure of the failed tubes were studied.The results show that there was an obvious change of microstructure for the failed T23 steel

whose microstructure was made of ferrite and no-orientation carbide.Its tensile strength and hardness increased weakly

while its proof strength of non-proportional elongation(Rp)decreased dramatically.The results for T91 went the opposite way

with a slight change of microstructure and a significant rise of tensile strength and hardness.It indicates that the factor determining the microstructure of failed superheater tubes made by ferrite high temperature-resistance steel is the cooling rate of furtance

but not the cooling rate of ejected fluid.

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