Experimental study on magnetic properties of austenitic heat-resistant steel for boiler tubes

SHI Zhigang; HE Xiaodong; MA Hong; JIA Jianmin; CUI Xionghua

doi:10.19666/j.rlfd.201802011

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Experimental study on magnetic properties of austenitic heat-resistant steel for boiler tubes

Thermal Power Generation Vol. 47, Issue 12, Pages: 53-59(2018)

更新时间：2025-05-30

- Experimental study on magnetic properties of austenitic heat-resistant steel for boiler tubes
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201802011
  CLC： TK223.11
- Published：2018
- 稿件说明：
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SHI Zhigang, HE Xiaodong, MA Hong, et al. Experimental study on magnetic properties of austenitic heat-resistant steel for boiler tubes[J]. Thermal Power Generation2018, 47(12): 53-59.
DOI：

SHI Zhigang, HE Xiaodong, MA Hong, et al. Experimental study on magnetic properties of austenitic heat-resistant steel for boiler tubes[J]. Thermal Power Generation2018, 47(12): 53-59. DOI： 10.19666/j.rlfd.201802011.

摘要

针对高温服役后奥氏体耐热钢锅炉管出现较高磁性问题

采用磁感应强度测量仪、奥氏体氧化物检测仪、综合物性测量系统(VSM)进行测试

进行热处理实验及显微组织分析

测试分析了TP304H、TP347H、S30432等奥氏体耐热钢新样品、高温服役样品及其碳化物的磁性能(磁当量、磁感应强度、磁化强度、饱和磁化强度、剩磁、矫顽力、磁滞回线等)。结果表明:具有铁磁性的α′-马氏体及其相变体积膨胀引起较高内应力产生的磁性和具有弱铁磁性碳化物产生的磁性共同引起在役奥氏体耐热钢出现较高磁性

其中碳化物引起的磁性可以忽略不计。

Abstract

High magnetism was found in austenitic heat resistant steel boiler tubes after service at high temperatures. To solve this problem

the magnetic properties(such as magnetic equivalent

magnetic induction intensity

magnetization

saturation magnetization

remanence

coercivity and magnetic hysteresis loop) of TP304 H steel

TP347 H steel

S30432 steel and other new samples of austenitic heat-resistant steel

samples after service at high temperatures and their carbides were investigated

through magnetic induction intensity measuring instrument

detector for carbides of austenitic steel

integrated physical property measurement system(VSM)

heat treatment and metallographic analysis. The results show that

the ferromagnetic α′-martensite

high internal stress caused by transformation expansion and weak ferromagnetic carbides lead to high magnetism in the austenitic heat resistant steel boiler tubes after service at high temperatures. The magnetism caused by weak ferromagnetic carbides can be ignored.

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